L = 9 x 300s

RGB = 2 x 300s binned 2x2 (each)

DSS > PixInsight > PS

www.astrobin.com/375877/

Sh2-155 is a diffuse nebula in the constellation Cepheus, within a larger nebula complex containing emission, reflection, and dark nebulosity.

It is widely known as the Cave Nebula, is an ionized H II region with ongoing star formation activity, at an estimated distance of 725 parsecs (2400 light-years) from Earth.

(description credits: wikipedia)

Technical card

Imaging telescope or lens:Teleskop Service TS Photoline 107mm f/6.5 Super-Apo

Imaging camera:ZWO ASI1600MM-Cool

Mount:Astro-Physics Mach-1 GTO CP4

Guiding telescope or lens:Celestron OAG Deluxe

Guiding camera:QHYCCD QHY5III174

Focal reducer:Riccardi Reducer/Flattener 0.75x

Software:Main Sequence Software Seqence Generator Pro, Astro-Physics AAPC, Pleiades Astrophoto PixInsight

Filters:Astrodon HA 36mm - 5nm, Astrodon B Gen.2 E-series 36mm, Astrodon G Gen.2 E-series 36mm, Astrodon R Gen.2 E-series 36mm, Astrodon S-II 36mm - 5nm, Astrodon O-III 36mm - 5nm

Accessories:ZWO EFW, MoonLite NiteCrawler WR30

Resolution: 1656x2230

Dates:Oct. 5, 2018, Oct. 7, 2018, Nov. 2, 2018, Nov. 6, 2018

Frames:

Astrodon B Gen.2 E-series 36mm: 23x1" (gain: 200.00) -20C bin 1x1

Astrodon G Gen.2 E-series 36mm: 23x1" (gain: 200.00) -20C bin 1x1

Astrodon HA 36mm - 5nm: 50x300" (gain: 200.00) -20C bin 1x1

Astrodon O-III 36mm - 5nm: 23x300" (gain: 200.00) -20C bin 1x1

Astrodon R Gen.2 E-series 36mm: 23x1" (gain: 200.00) -20C bin 1x1

Astrodon S-II 36mm - 5nm: 23x300" (gain: 200.00) -20C bin 1x1

Integration: 8.0 hours

Avg. Moon age: 26.41 days

Avg. Moon phase: 13.11%

Astrometry.net job: 2365517

RA center: 344.185 degrees

DEC center: 62.624 degrees

Pixel scale: 2.932 arcsec/pixel

Orientation: 359.390 degrees

Field radius: 1.131 degrees

Locations: Berga Resort, Berga, Barcelona, Spain

Data source: Backyard

A Narrowband HOO Palette image of the faint emission nebula Sharpless 308 (also cataloged as Sh2-308, RCW 11, and LBN 1052), or simply referred to as the Dolphin Nebula.

Sh2-308 is an emission nebula and HII region located near the center of the constellation Canis Major, composed of ionised Hydrogen. It is about 8 degrees south of Sirius, the brightest star in the night sky. The nebula is bubble-like, surrounding a Wolf-Rayet star named EZ Canis Majoris. This star is in the brief, pre-supernova phase of its stellar evolution.

About this image:

This image is the result of photographing over several nights from the Southern Hemisphere (from dark rural skies, to my Pier at home). Deep Sky Objects like this is a challenge, as it pushes the limits of my modest Telescope gear.

Technical Info:

24 x 600 sec. 7nm Hydrogen-Alpha (Ha).

24 x 600 sec. 6.5nm Doubly Ionized Oxygen (OIII).

William Optics Star 71mm f/4.9 Imaging APO Refractor.

Sensor cooled to -15°C on my QHY163M.

Calibration frames: Bias, Darks and Flats.

SGP Mosaic and Framing Wizard.

Astrometry.net ANSVR Solver via SGP.

Pre-Processing and Linear workflow in PixInsight,

and finished in Photoshop.

Astrometry Info:

Center RA, Dec: 103.602, -23.925

Center RA, hms: 06h 54m 24.409s

Center Dec, dms: -23° 55' 29.074"

Size: 1.48 x 1.11 deg

Radius: 0.925 deg

Pixel scale: 3.33 arcsec/pixel

Orientation: Up is 113 degrees E of N

View an Annotated Sky Chart for this image.

View this image in the WorldWideTelescope.

Nr. 1 in Flickr Explore:

2019-02-02

Top 25 Photos on Flickr in 2019:

www.flickr.com/photos/flickr/galleries

blog.flickr.net/en/2019/12/19/top-25-photos-on-flickr

APOD GrAG on 2020/01/01:

apod.grag.org/2020/01/01/sharpless-308-the-dolphin-nebula

The Art of Astrophotography:

Also visit my Flickr Group: The Art of Astrophotography, that features the work of Astrophotographers from around the world.

This image is part of the Legacy Series.

Photo usage and Copyright:

Medium-resolution photograph licensed under Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International Terms (CC BY-NC-ND 4.0). For High-resolution Royalty Free (RF) licensing, contact me via my site: Contact.

Martin Heigan

-

[Home Page] [Photography Showcase] [eBook]

[Facebook] [3D VFX & Mocap] [Science & Physics]

on black

L(RGB) = 6x480s(5x240s:5x240s:5x240s)

L = 1x1bin

RGB = 2x2bin

12" R-C in rodeo, new mexico (lightbuckets.com LB-0003)

stacked with deepskystacker

initial processing with pixinsight 1.5

- normalization of ngc1977 vs. m42 data

- all subs aligned to luminance data

- rgb merge

- combined ngc1977 and m42 data with pixel math to produce a single image

- deconvolution

- histogram stretch (x10) of merged rgb data and luminance data

enfuse:

- HDR blend of all exposures generated in pixinsight

- luminance: hard mask, mean=0.54026, sigma=0.23154

- rgb: hard mask, mean=0.64026, sigma=0.23154, l-star grey projector

- had to duplicate the unstretched exposure 8 times to recover trapezium

photoshop: remove geosynchronous satellite streaks

pixinsight:

- histogram fixes and color calibration of rgb images

- histogram fixes, dark structure enhancement and atrous wavelets on luminance image

- LRGB merge

- chop composite image back into 2 separate images

- further histogram fix of ngc1977 to better match m42

hugin:

- stitch of ngc1977 and m42 images

lightroom:

- fix red/magenta saturation (pixinsight is running without color management... long story)

- crop

comments: the deconvolution is kind of bad... its heavy duty signal processing work that requires more patience than i could muster. as a result i've got some ringing and sharpening of bogus features.

it was really hard to get the two images to have the same brightness even though the exposures were the same. different nights, different amount of moon, different sky transparency all conspire to make two identically exposed images very different.

finally this is HDR so although the relative brightness between m42 and ngc1977 should be correct, the dynamic range of both have been greatly compressed. most other treatements of these objects show ngc1977 much fainter than seen here. but what is realistic when dealing with astrophotography?

NGC2264 & IC447

I'm βtester of QHY16200A

This is firstlight of QHY16200A(βtest model)

I think 16200sensor can get very clean & smooth data.

This picture wasn't applied dark flame calibration.

Date:

Feburary 10 2016,21:00~25:00(JST)@Gulliver Parking,Yamanashi,Japan（1130meters above sea level）

Equipment

Telescope: Takahashi FSQ106ED 645RD (380mm f/3.6)

Camera: QHY16200A (β TEST model)

Filters: Astrodon LRGB

Mount: Skywatcher EQ8

Guide scope: Eyebell 400mm F5

Guide Camera: StarlightExpress Superstar

Data

Capture & Auto guide by MaximDl 6 (Dithering mode）

L 450sec x 20,RGB 300sec x 3(each) -30℃

Calibration & Batch composite: Pixinsight （No dark calibration)

Post production: Pixinsight & Photoshop CC2014

The Tarantula Nebula is the most luminous nebula in our galaxy. It is so bright that if it were as close to earth as the Orion nebula it would cast shadows. It is also the largest star burst area and HII region in our Local Group of galaxies. The closest supernova since the invention of the telescope, 1987A, occurred just at the outskirts of this nebula.

Takahashi TAO-150B

FLI 16200 (scale 1.1")

AP 1600GTO Abs Encoders

Data from Deepskywest El Sauce Observatory (Rio Hurtado, Chile)

Ha (39x5min / 18x15min)

Oiii (24x30min)

Sii (19x15min)

R (28x2min / 15x10min)

G (15x2min / 12x10min)

B (14x2min / 15x10min)

Total Integration = 33.4hrs

Pixinsight:

Bias/Dark/Flat/CC

LocalNorm/Drizzle/Resample 50%

HDRComposition

ChannelCombination RGB

PCC

PixelMath SHO/BN

ChannelExtraction Lum

Deconvolution

Delinearize/HDRMT/Curves

ChannelCombination Lum on RGB

Photoshop:

ColorEfex Pro - Detail Extractor

Curves/Saturation

More playing with the SBIG and 300mm Nikkor lens. Hung out in the back garden and collected a couple hours on this target. There was a stiff breeze, so the guiding is a little off, still I really do like the dusty contrasts. Would love to get to a dark site to collect some color data!

26x300s

Astrodon 50mm Ha filter (6nm)

SBIG STL-11000M

Nikkor 300mm f/4.5 manual lens

CGEM-DX

PixInsight

Images taken over the month of October & November 2021

ATIK 460EX

TS 80/560 F7 Reducer/Flattener 0,8x

SIX-PANEL-MOSAIC

6 x Ha 40 x 5min

6 x OIII 20 x 5min

6 x SII 20 x 5min

Reprocessing of the Heart Nebula from 2021 with PixInsight.

Stack Program: Astro Pixel Processor

Pictures combined with Pixinsight (L+SHO)

Image Processing: PixInsight

www.astrobin.com/a6yw4n/

It's all about the NGC 7538 region in the constellation Cepheus.

This region of active star formation is located about 9,100 light-years from Earth.

The picture is a result of more than 78 hours of integration time in narrow band and rgb channels.

I could say that is a more complicated target than I thought at the beginning, it was difficult to post process this image due the high dynamic range needed to reveal all the details.

Technical card

Imaging telescopes or lenses: Teleskop Service TS Photoline 107mm f/6.5 Super-Apo · Altair Astro RC250-TT 10" RC Truss Tube

Imaging cameras: ZWO ASI183MM-Cool · ZWO ASI1600MM-Cool

Mounts: Skywatcher EQ6R Pro · Mesu 200 Mk2

Guiding telescopes or lenses: Celestron OAG Deluxe · Teleskop Service TSOAG9 Off-Axis Guider

Guiding cameras: ZWO ASI290 Mini · ZWO ASI174 Mini

Focal reducers: Riccardi Reducer/Flattener 0.75x · Telescope-Service TS 2" Flattener

Software: Pleiades Astrophoto PixInsight · Seqence Generator Pro

Filters: Astrodon O-III 36mm - 5nm · Astrodon S-II 36mm - 5nm · Astrodon R Gen.2 E-series 36mm · Astrodon G Gen.2 E-series 36mm · Astrodon B Gen.2 E-series 36mm · Astrodon HA 36mm - 5nm · Astrodon L Gen.2 E-series 36mm

Accessory: Pegasus Astro Falcon Rotator · ZWO EFW · Astrolink 4.0 mini · Pegasus Astro Ultimate Powerbox v2 · MoonLite NiteCrawler WR30 · TALON6 R.O.R · MoonLite CSL 2.5" Focuser with High Res Stepper Motor

Dates:Oct. 24, 2020 , Oct. 25, 2020 , Nov. 8, 2020 , Nov. 12, 2020 , Nov. 13, 2020 , Nov. 17, 2020

Frames:

Astrodon B Gen.2 E-series 36mm: 110x30" (gain: 75.00) -20C bin 1x1

Astrodon G Gen.2 E-series 36mm: 110x30" (gain: 75.00) -15C bin 1x1

Astrodon HA 36mm - 5nm: 224x600" (gain: 200.00) -20C bin 1x1

Astrodon O-III 36mm - 5nm: 117x600" (gain: 111.00) -15C bin 1x1

Astrodon R Gen.2 E-series 36mm: 110x30" (gain: 75.00) -20C bin 1x1

Astrodon S-II 36mm - 5nm: 113x600" (gain: 111.00) -15C bin 1x1

Integration: 78.4 hours

Avg. Moon age: 16.02 days

Avg. Moon phase: 33.72%

Astrometry.net job: 4054629

RA center: 0h 3' 14"

DEC center: +67° 16' 4"

Pixel scale: 0.797 arcsec/pixel

Orientation: 0.709 degrees

Field radius: 0.399 degrees

Resolution: 2304x1684

Locations: AAS Montsec, Àger, Lleida, Spain

Data source: Own remote observatory

Remote source: Non-commercial independent facility

Messier 16 – M16

Constelación en que se encuentra: Serpens

Distancia: 7.000 años luz

De SkySafari:

Messier 16 (#M16) es una nebulosa ubicada en la constelación Serpens. Corresponde a una región de formación de nuevas estrellas. En la imagen también se ve el cúmulo NGC 661, descubierto en 1745. M16 fue incluida por Charles Messier en su catálogo en 1764.

En 1995 el telescopio espacial Hubble tomó la imagen más famosa de esta nebulosa, conocida como los Pilares de la creación. Los pilares se ven en el centro de la imagen.

Estudios de 2007 realizados con el telescopio espacial Spitzer han sugerido evidencia de que los pilares fueron destruidos hace unos 6.000 años por la explosión de una supernova. Si se tiene en cuenta que estaban a 7.000 años luz, su nueva forma posterior a la destrucción, solo será visible desde la tierra dentro de un milenio.

Datos de la imagen:

Exposure: 2hr 10min LRGB (8 x 5min Ha, 9 x 5 min OIII, 9 x 5 min SII)

Telescope: #Celestron #EdgeHD #C925

Camera: #PlayerOne #Poseidon-M

Focal ratio: f10

Focal length: 2350 mm

Capturing software: NINA

Filter: #Optolong L, Optolong R, Optolong G, Optolong B

Mount: #iOptron #CEM60

Guiding: PlayerOne #Xena with PlayerOne #OAG Max and #PHD2

Dithering: Yes

Calibration: 15 darks, 15 flat darks, 10 flats

Processing: #PixInsight

Date: 25-jun-2025

Location: #Bogotá, #Colombia

Nov 10 2018 , reprocessed in PixInsight . I am almost finish my work flow there and will processing all my images in PixInsight :)

NGC 2261 is known as Hubble's Variable Nebula. It is a peculiar emission and reflection nebula enveloping the variable star R Monocerotis.

The nebula was first observed by Sir William Herschel in 1783; this curious fan-shaped reflection nebula was originally mistaken as a comet. The variability of its associated star was discovered in 1861, and the variability of the nebula itself was discovered by Edwin Hubble in 1916. Hubble's Variable Nebula was the first object photographed by the 200-inch Hale Telescope at Mount Palomar in 1949.

The nebula appears only 2 x 4 arc minutes in size. The nebula is known to vary in brightness by up to two full magnitudes on a timescale of months to years.

At an estimated distance of 2,500 light years, NGC 2261 is about 3 light years long and 1.5 light years wide. Hubble's Variable Nebula is believed to be an outlying part of the large NGC 2264 nebula complex, appearing about a degree away.

NGC 2261 changes in brightness along with its illuminating star, and has also shown changes in its structure over the last century. The nebula's rapid changes in brightness are in fact shadows cast by dusty matter in orbit around R Monocerotis. The star, R Mon, is a young 10-solar mass-class B star with a small companion; both are in the pre-main-sequence stage.

source: skysafari

This astrophotography is a stacking of Luminance frames from December 2020 to April 2021: it does not highlight the variation in brightness of the star/nebula.

RA: 06h 39m 09.2s

DEC: +08° 45’ 35.6"

Size: 14 x 14 arcmin

Orientation: Up is 359 degrees E of N

Location: Monoceros

Distance: 2.5 kly

Magnitude: 9.0

Acquisition December 2020 to April 2021

Total acquisition time of 19.6 hours.

Technical Details

Data acquisition: Telescope.Live

Processing: Nicolas ROLLAND

Location: El Sauce Observatory, Río Hurtado, Coquimbo, Chile

L: 48*600s

L: 73*300s

R: 4*600s

G: 3*600s

B: 3*600s

Optics: Planewave CDK24

Mount: Mathis MI-1000/1250

CCD: FLI ProLine PL9000

Pre Processing: CCDstack, Pixinsight & Excalibrator

Post Processing: Photoshop CC

The Cosmic Reef - HA LRGB

NGC 2020 is an HII Region surrounding the Wolf-Rayet star BAT99-59. Located in the Large Magellanic Cloud, together with NGC 2014 it makes up what is called the Cosmic Reef.

Data acquired by Telescope Live advanced request.

NGC7635

Constelación en que se encuentra: Cassiopeia

Distancia: 1.400 años luz

De SkySafari:

#NGC7635, conocida como Nebulosa Burbuja fue descubierta en 1787 por Wilhelm Herschel. Es el resultado del viento estelar causado por la estrella SAO20575, de magnitud 8.7 que en la imagen aparece a la derecha dentro de la burbuja. La estrella es caliente, con temperatura de unos 36.000 grados C; el diámetro es 24 veces el del sol y su masa equivale a 49 masas solares.

La forma de la nebulosa es causada por el choque del viento estelar contra la nube de gas alrededor de la estrella, que también causa que brille. Se espera que SAO20575 termine como una supernova dentro de los próximos 20 millones de años.

Datos de la imagen:

Exposure: 9hr 00min SHO 3nm (31 x 5min Ha, 44 x 5 min OIII, 33 x 5 min SII)

Telescope: #Celestron #EdgeHD #C925

Camera: #PlayerOne #Poseidon-M

Focal ratio: f10

Focal length: 2350 mm

Capturing software: NINA

Filter: #Optolong L, Optolong R, Optolong G, Optolong B

Mount: #iOptron #CEM60

Guiding: PlayerOne #Xena with PlayerOne #OAG Max and #PHD2

Dithering: Yes

Calibration: 30 darks, 10 flat darks, 10 flats (per filter)

Processing: #PixInsight

Date: 13-sep-2025, 20-sep-2025, 3-oct-2025

Location: #Bogotá, #Colombia

NGC7497

Planewave 17” CDK

Camera: FLI ML16803

Filter: Chroma L,R,G,B

Focuser: IRF90

Focal Length: 2939mm

Focal Ratio: f/6.8

Mount: 10 Micron GM3000

Location: Deep Sky West, Chile

18h of LRGB data, combination in PixInsight done:

L: 116 x 300sec

R: 36 x 300sec

G: 28 x 300sec

B: 36 x 300sec

www.deepskywest.com/

planewave.com/product/cdk17-ota/

distance: 1,450 Lj

de.wikipedia.org/wiki/Cirrusnebel

HaRGB

RGB Equipment:

Skywatcher ED80

EOS 350Da cooling

IDAS-LP2

Celestron CGEM

Guiding:

Toucam an 9x50 Finderscope

PHD

19x600s ISO 1600

30. September 2011

Equipment H-Alpha:

TS 10" f/4 ONTC Newton

1000mm f4

GPU Aplanatic Koma Korrector

Moravian CCD G2-8300FW

Astronomik H-Alpha Filter

Losmandy G11/LFE Photo

Guding:

Lodestar on TS Optics - ultra short 9mm Off Axis Guider

PHD2

3-part mosaic

3x16x900 H-Alpha

04. August 2015

05. August 2015

07. August 2015

total exposure time: 15hour

Processing: PixInsight/Lightroom

보령 청보리밭 은하수

The milky way rises over an abandoned barn on top of a hill in the middle of barney fields.

Sky : 35min (35*60") @ 24mm F4 iso500

PP : Sequator, PixInsight, Photoshop

Thanks Explore (#168). Position (#62)

With a nice streak of clear nights, I decided to see if my new Fujifilm X-T5 can improve my deep sky images with its 45 mpix sensor. This cropped image was post processed with PixInsight and Photoshop and it turned out quite acceptable despite taken in a city with a population of 65,000.

Tech Specs: Fujifilm X-T5, Nikkor 180mm f/2.8 @ f/5, iso 1000, exp 578 subs @ 30 sec (4.8 hour integrated time), guide Astrotrac, RAW.

Bortle skies 5.5, transparency 8 to 10, no moon. Elevation 6118 feet.

Click 2x to enlarge.

Picture of the day x 5

The Trifid Nebula, also known as Messier 20 (M20) or NGC 6514 resides near the center of our Milky Way galaxy in the constellation Sagittarius. It is a relatively young (less than one million years old) star forming region approximately 5200 light years from earth.

It consists of a reddish emission nebula caused by ionized hydrogen, a reflection nebula … the blue light reflected from nearby stars, and a dark nebula from obscuring dust clouds.

It actually gets its name (Trifid) from those dark nebula gaps which appear to divide it into three parts or lobes.

This is 94 minutes of 10 second images taken with the SeeStar telescope, processed in PixInsight, Nik Collection software, and Topaz sharpening.

NGC2626

LRGBHa data from Telescope Live. Processed with PixInsight.

app.telescope.live/en

nova.astrometry.net/user_images/13361454#annotated

The Cat's Paw Nebula ( NGC 6334 ) in Scorpius - by Mike O'Day ( 500px.com/MikeODay )

Also known as the Bear Claw Nebula, NGC 6334 is an emission nebula near the scorpion's tail in the Scorpius constellation.

Image details:

Image centre ...... RA: 17 20 08.185 Dec: -35 52 30.91

Field of view ..... 57' 37.8" x 38' 51.8"

Rotation .......... 0.00 deg ( North is up )

Resolution ........ 0.586 arcsec/px

Telescope: Orion Optics CT12 Newtonian ( mirror 300mm, fl 1200mm, f4 ).

Corrector: ASA 2" Coma Corrector Quattro 1.175x.

Effective Focal Length / Aperture : 1470mm f4.7

Mount: Skywatcher EQ8

Guiding: TSOAG9 Off-Axis-Guider, Starlight Xpress Lodestar X2, PHD2

Camera:

Nikon D5300 (unmodified) (sensor 23.5 x 15.6mm, 6016x4016 3.9um pixels)

Location:

Blue Mountains, Australia

Moderate light pollution ( pale green zone on darksitefinder.com map )

Capture ( July 2018 ):

6 sets of sub-images with exposure duration for each set doubling ( 4s to 240s ) all at ISO 250.

168 x 4 min frames plus ~10 frames each for the shorter exposures

Processing:

Calibration: bias, dark and flat

Integration in 8 sets

HDR combination

Pixinsight July 2018

Links:

500px.com/MikeODay

photo.net/photos/MikeODay

www.flickr.com/photos/mike-oday

Shotdate: 2-29-2016

Camera: Nikon D4s

Optics: Celestron 9.25" EdgeHD

Mount: SkyWatcher NEQ6 Pro

Guiding: f500mm F90mm guidescope with Lacerta MGEN guider

ISO-speed: 3200 ISO

Lights: 71x300 seconds

Darks: 73

Bias: 117

Flats: 60

Stacking in DeepSkyStacker and processing in PixInsight

258x180s Luminanz

158x300s h-Alpha

33x180s red

33x180s green

32x180s blue

total 30,9 hours

Equipment:

Epsilon 130D dual rig

QHY268m + CFW3M

TS2600MP (Touptek IMX571) + ZWO EFW

Astronomik DeepSky RGB

Astronomik MaxFR

Pegasus NYX-101

June/July 2024

Location: french alp

Date: 00:05-01:10JST Feb.7, 2021

Location: Amagi Highland, Shizuoka Pref., Japan

Cloud Coverage: < 5%

Wind: 5 ~ 10kt

Temperature: -0.7C ~ 2.7C

Humidity: 47% ~ 76%

Air pressure: 891.2 ~ 891.9hPa

Lens: SIGMA 135mm F1.8 DG HSM | Art (f/2.2)

Mount: RainbowAstro RST-135

Autoguider: QHY5L-II, LM75JC, PHD2

Camera: Canon EOS 6D (mod/SEO-SP4)

ISO speed: 3200

Exposure: 30x120sec.

Processing: PixInsight

SV152, U16M, Paramount MX, PixInsight 1.8

Object description at www.billionsandbillions.com

10 x 2 minutes

20mm(f/4.0)

iso 1600

Canon 500d(modified)

Vixen Polarie

Porteau Cove, BC

Processed in DSS, Pixinsight, and CS5

Processing workflow: Stacked in DSS, Pixinsight: Automatic Background extraction, Histogram adjust, starmask (noiseThreshold 0.02), invert mask/ hdrMultiscaleTransform, invert back, morphologicalTransformation(48), color correction, curvestransform saturation, TVGDenoise, CS5: Diffusion filter

www.astrobin.com/995c30/F/

Another object from this nice catalogue of faint nebula.

Long integration of 53 hours using two narrow band filters mainly, searching the limits of the equipment and my own process skills.

It's not a popular target probably because is difficult and usually is not showing so much detail due to the high dynamic range, the core is bright, really bright compare with the faint surroundings.

Sh2-235 is the most central and brightest nebula of an H II region known as G174+2.5; it is observed in the direction of the northern part of the Aur OB1 association and includes the nebulae catalogued as Sh2-231, Sh2-232, Sh2-233 and Sh2-235, identified as individual nebulae in the 1959 census of H II regions. Although in the optical images they appear as distinct nebulae, in reality they all belong to a single giant molecular cloud, of which some parts appear illuminated by young and hot stars. This cloud is located in Perseus' Arm at a galactic latitude that places it slightly off-center with respect to the center of the galactic disk; the distance measurements indicate a range between 1600 and 2000 parsec, so it is normally indicated as about 1800 parsec (5870 light years).

(descri. credits to wiki.it it.wikipedia.org/wiki/Sh2-235)

Technical card

Imaging telescope or lens:Altair Astro RC250-TT 10" RC Truss Tube

Imaging camera:ZWO ASI1600MM-Cool

Mounts:Mesu 200 Mk2, Astro-Physics Mach-1 GTO CP4

Guiding telescope or lens:Celestron OAG Deluxe

Guiding camera:ZWO ASI174 Mini

Focal reducer:Riccardi Reducer/Flattener 0.75x

Software:Pleiades Astrophoto PixInsight , Seqence Generator Pro

Filters:Astrodon O-III 36mm - 5nm, Astrodon S-II 36mm - 5nm, Astrodon R Gen.2 E-series 36mm, Astrodon G Gen.2 E-series 36mm, Astrodon B Gen.2 E-series 36mm, Astrodon HA 36mm - 5nm, Astrodon L Gen.2 E-series 36mm

Accessories:ZWO EFW, MoonLite NiteCrawler WR30

Resolution: 2328x1760

Dates:Dec. 25, 2019, Jan. 3, 2020, Jan. 12, 2020, Jan. 15, 2020

Frames:

Astrodon B Gen.2 E-series 36mm: 90x30" (gain: 75.00) -20C bin 1x1

Astrodon G Gen.2 E-series 36mm: 90x30" (gain: 75.00) -20C bin 1x1

Astrodon HA 36mm - 5nm: 186x600" (gain: 200.00) -20C bin 1x1

Astrodon R Gen.2 E-series 36mm: 90x30" (gain: 75.00) -20C bin 1x1

Optolong SII 6.5nm 36mm: 121x600" (gain: 113.00) -20C bin 1x1

Integration: 53.4 hours

Avg. Moon age: 18.25 days

Avg. Moon phase: 55.61%

Astrometry.net job: 3224550

RA center: 5h 41' 5"

DEC center: +35° 49' 58"

Pixel scale: 1.007 arcsec/pixel

Orientation: 90.283 degrees

Field radius: 0.408

Locations: AAS Montsec, Àger, Lleida, Spain

Data source: Own remote observatory

Remote source: Non-commercial independent facility

This is my first Post-Covid image but also my first Mosaic since switching back to a MONO imager, was so happy with the performance of my ASI6200MC Pro that I stuck with the same model but the MONO version, taken from Bortle 4 skies in the south east UK

RA: 05h23m06.99s

Dec: +33°58'17.2"

Constellation: Auriga

Designation: IC405, IC410 / NGC1893, IC417, NGC1907, NGC1931

Image Details:

Panel 1: 101x150S in 3nm Ha, 4.5nm OIII and 4.5nm SII

Panel 2: 101x150S in 3nm Ha, 4.5nm OIII and 4.5nm SII

Darks: 201 Frames

Flats: 201 Frames

Bias: 201 Frames

Acquisition Dates: Jan. 29, 2022 · Feb. 4, 2022 · Feb. 6, 2022 · Feb. 18, 2022 · Feb. 19, 2022 · Feb. 21, 2022 · Feb. 22, 2022 · Feb. 24, 2022 · Feb. 25, 2022 · Feb. 26, 2022 · Feb. 27, 2022

Total Capture time: 25h 15min

Equipment Details:

Imaging Camera: ZWO ASI6200MM Pro 62mpx Full Frame

Imaging Scope: SharpStar 15028HNT Hyperboloid Astrograph

Guide Camera: ZWO ASI260MC Pro

OAG: ZWO L-OAG

Mount: Sky-Watcher EQ8 Pro

Pier: Altair Astro Skyshed 8" Pier

Focuser: Primalucelab Sesto Senso V2

Filter: Baader Ultrafast F2 3nm Ha, 4.5nm OIII and 4.5nm SII

Power and USB Control: Primalucelab Eagle4 Pro

Acquisition Software: Main Sequence Software. Sequence Generator Pro 3.2

Calibration and Stacking: Astro Pixel Processor

Processing Software: PixInsight 1.8.8 and EZ Processing Suite for Star Reduction

TS 115/800

ZWO ASI 1600 mono cooled

LRGB

L: 180 minutes

RGB: 240 minutes (DSLR)

Total: 7 hours

PixInsight + PS6

Using my data from last January, I reprocessed Orion using Pixinsight.

astrocamp.eu/en/messier-81-widefield-march-25/

In March 2025, I embarked on an astrophotography project focusing on Messier 81 and its neighboring galaxies. I captured the luminance data at the Hohen List observatory in the Eifel region, while the RGB channels were taken earlier from my home in Koblenz. Combining these, I achieved a total exposure time of 6 hours and 20 minutes. The resulting widefield image prominently features Messier 81 at the center, with Messier 82 to its left, the Garland Galaxy below, and NGC 2976 in the upper right. This project served as a testament to the capabilities of my telescope-camera setup, delivering impressive results even with a relatively short integration time.

Around 600 shots with 70-200mm exposure of 0,8 seconds.

Processed stacked in Pixinsight.

No equatorial or azimutal mount.

Using the MARS data in the latest PixInsight I got the best result I've gotten from M45.

15 hours

ASI 2600 mcpro/ASI 290 mono

AM5/AA+

StellarVue 90mm/Askar FMA180Pro

8 panel mosaic

view in full size ;)

Equipment:

TS 10" f/4 ONTC Newton

1000mm f4

ZWO AS183mmPro

2x Barlow

Skywatcher EQ8

The Lion Nebula.

Found in the constellation of Cepheus, the Lion Nebula when viewed from just the right perspective, actually does represent a lion. At approx 10,000 light years away

it is made up of an emission nebula and a reflection nebula.

Not bright enough for visual observation sadly, it does however make for a great imaging target.

Boring Techie bit:

Telescope: Askar FRA400

Mount: EQ6r pro

Camera: ZWO 533mc pro

Filter: Optolong L'eNhance.

Guided and controlled by the ZWO asiair+

Eighty 3 minute exposures

Stacked & processed in PixInsight with BlurXterminator, NoiseXterminator, Starnet++, Graxpert and Affinity Photo.

Nebulosa California (California nebula) #NGC1499

Constelación en que se encuentra: Perseus

Distancia: 1800 de años luz

De SkySafari:

NGC 1499 es una nebulosa de emisión en la constelación Perseo que recibe su nombre por el parecido con el mapa del estado de California de Estados Unidos. Fue descubierta en 1885.

Su brillo superficial es bajo. Está a unos 1800 años luz del sistema solar, en el brazo de Orión de la Vía Láctea. Es una región en la que, por su alto contenido de hidrógeno, se han formado muchas estrellas masivas y luminosas. La estrella luminosa es Menkib (Xi-Per), de color blanco azuloso, e ilumina la nebulosa.

Datos de la imagen:

Exposure: 4hr 09min (83 x 3min)

Telescope: #Celestron #EdgeHD #C925 #Hyperstar

Camera: ZWO #ASI2600MC Pro

Focal ratio: f2.3

Capturing software: NINA

Filter: IDAS #NBZ

Mount: #iOptron #CEM60

Guiding: #ASI462MC with #PHD2 and Stellarvue F60M3

Dithering: Yes

Calibration: 30 darks, 30 flat darks, 50 flats

Processing: #PixInsight

Date: 24-nov-2024

Location: #Bogotá, #Colombia

The Elephant's Trunk nebula is a concentration of interstellar gas and dust in the star cluster IC 1396 – an ionized gas region located in the constellation Cepheus about 2,400 light years away from Earth. The piece of the nebula shown above is the dark, dense globule IC 1396A; it is commonly called the Elephant's Trunk nebula because of its appearance at visible light wavelengths, where there is a dark patch with a bright, sinuous rim. The bright rim is the surface of the dense cloud that is being illuminated and ionized by a very bright, massive star that is just to the west of IC 1396A. The entire IC 1396 region is ionized by the massive star, except for dense globules that can protect themselves from the star's harsh ultraviolet rays.(Explore Scientific ED127, ZWO ASI2600MM, ASIAIR, EAF, EFW, AM5, Antlia SHO 3nm, Pixinsight, Photoshop).

12x 180 sec with Star Adventurer SW and nikon d 5100. Pixinsight 1.8

45x40sec iso 800

Canon 6D + Canon 400mm f5.6 L @5.6

Skywatcher Star Adventurer

clip in Lpro Filter

stacked at pixinsight

post pixinsight + photoshop

M81/M82 - 20-05-2020 - Saucats

Lights: 300x30" (2h30)

Reprise du traitement avec PixInsight.

DOF: 50

Iso: 1600

Traitement: PixInsight / DxO PhotoLab

Nikon D3100 (Non Défiltré)

Skywatcher 80ED Equinox (80x500)

Skywatcher Az-Gti Equatorial Mode

6/24 - Ha 28 x 600s

6/28 - SII 30 x 600s

6/29 - OIII 30 x 600s

Nébuleuse IC 434 dite tête de cheval

Constellation d'Orion

30 images de 120 secondes

Two palnel mosaic

Taken on 14 and 15 Jan from Cajon del Maipo

Telescope: Celestron C8 - Hyperstar

Mount: CGEM

Guiding 80/400 refractor - Lodetar

Camera QHY8L

Frame1= 61x200 sec

Frame2=75*200 sec

Capture using MaximDL

Reduction and processing=Pixinsight 1.8 RC3

6 heures (brutes de 60") au RC8 + réducteur x0.68 (1088 mm de focale) + ASI533MC + filtre Optolong L-Pro, Pixinsight.

Mi ultima toma de 2017

Nexstar 8Se

CGEM

QHY Img132e

Mosaico de 14 teselas.

Autostakkert

ICE

PixInsight

Ps Cs6

Ciudad de México, Coyoacan.

A Cluster of Pearls in the Southern Skies ( NGC 3766 " The Pearl Cluster" ) by Mike O'Day ( 500px.com/MikeODay )

Shimmering like a pearl to the naked eye, this open cluster of mostly young blue stars ( known as the "Pearl Cluster" ) is approximately 5500 light years from Earth and was discovered by Abbe Lacaille in 1752 from South Africa.

This HDR "true colour" image is constructed from 11 sets of exposures ranging from 1/4 sec ( to capture the centre of the brighter stars ) through to 240 seconds ( for the fainter stars of the Milky Way ). Total exposure time was around 5 hours.

12 April 2018

Image details:

Field of view ..... 58' 49.8" x 39' 36.4"

Image center ...... RA: 11 36 03.890 Dec: -61 35 30.17

Resolution ........ 0.586 arcsec/px ( full size image )

Orientation: North is up

Telescope: Orion Optics CT12 Newtonian ( mirror 300mm, fl 1200mm, f4 ).

Corrector: ASA 2" Coma Corrector Quattro 1.175x.

Effective Focal Length / Aperture : 1470mm f4.7

Mount: Skywatcher EQ8

Guiding: TSOAG9 Off-Axis-Guider, Starlight Xpress Lodestar X2, PHD2

Camera:

Nikon D5300 (unmodified) (sensor 23.5 x 15.6mm, 6016x4016 3.91um pixels)

Location:

Blue Mountains, Australia

Moderate light pollution ( pale green zone on darksitefinder.com map )

Capture ( 12 April 2018 ):

11 sets of sub-images with exposure duration for each set doubling ( 1/4s to 240s ) all at ISO250.

( 70 x 240sec + 10 each forthe other durations )

Processing:

Calibration: master bias, master flat and master dark

Integration in 11 sets

HDR combination

Pixinsight April 2018

Links:

www.500px.com/MikeODay

www.flickr.com/photos/mike-oday

www.photo.net/photos/MikeODay

A Hydrogen-Alpha + Oxygen III + Sulphur II Narrowband widefield image of the Cygnus Wall. The North America Nebula (NGC 7000 or Caldwell 20) is an emission nebula in the constellation Cygnus, close to the star Deneb. The remarkable shape of the nebula resembles that of the continent of North America, complete with a prominent Gulf of Mexico.

The Cygnus Wall:

The Cygnus Wall is a term for the "Mexico and Central America part" of the North America Nebula. The Cygnus Wall has the most concentrated star formation in the nebula. The North America Nebula and the nearby Pelican Nebula, (IC 5070) are in fact parts of the same interstellar cloud of ionized hydrogen (H II region). The nebula complex is estimated to be about 1,800 light-years from Earth.

Gear:

William Optics Star 71mm f/4.9 Imaging APO Refractor Telescope.

William Optics 50mm Finder Scope.

Celestron SkySync GPS Accessory.

Orion Mini 50mm Guide Scope.

Orion StarShoot Autoguider.

Celestron AVX Mount.

QHYCCD PoleMaster.

Celestron StarSense.

QHYCFW2-M-US Filterwheel (7 position x 36mm).

QHY163M Cooled CMOS Monochrome Astronomy Camera.

Tech:

Guiding in Open PHD 2.6.3.

Image acquisition in Sequence Generator Pro.

Lights/Subs:

2 Stage Cooled CMOS

Imaged at -25°C

Gain: 20

Offset: 80

Narrowband:

S = 12 x 600 sec. 16bit FITS.

H = 12 x 600 sec. 16bit FITS.

O = 12 x 600 sec. 16bit FITS.

Calibration Frames:

50 x Bias/Offset.

25 x Darks.

20 x Flats & Dark Flats.

PixelMath RGB Channel Combination:

PixInsight Expression:

R = SII

G = (Ha*OIII)*1.5

B = OIII

Image Acquisition:

Sequence Generator Pro with the Mosaic and Framing Wizard.

Plate Solving:

Astrometry.net ANSVR Solver via SGP.

Processing:

Pre-Processing and Linear workflow in PixInsight,

and finished in Photoshop.

Photographed in the following wavelengths of light:

Optolong SHO Narrowband filters:

OIII line 500.7nm (6.5nm bandwidth)

H-Alpha line 656nm (7nm bandwidth)

SII line 672nm (6.5nm bandwidth)

Astrometry Info:

View the Annotated Sky Chart for this image.

Center RA, Dec: 314.764, 44.279

Center RA, hms: 20h 59m 03.425s

Center Dec, dms: +44° 16' 43.955"

Size: 2.27 x 1.55 deg

Radius: 1.375 deg

Pixel scale: 5.11 arcsec/pixel

Orientation: Up is 97.9 degrees E of N

View this image in the World Wide Telescope.

Martin

-

[Home Page] [Photography Showcase] [My Free Photo App]

[Flickr Profile] [Facebook] [Twitter] [My Science & Physics Page]

A large stellar nursery in the constellation of Scorpius some 6,000 light years away from us.

The nebula is very faint, making it difficult to observe, despite it's size of around 250 light years.

The image consists of 19 data sets of 5 minute LRGB each.

Data was captured online using the Chile 2 telescope at Slooh.com

In HOO

Processed in Photoshop and pixinsight