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Comet ATLAS C/2019 Y4, discovered in December 2019, has been quickly increasing in brightness over the last few months, and many of us hope that trend will continue; past projections put it as reaching naked-eye brightness this April or May. However, it's brightness has recently plateaued around magnitude +8. That and an elongated nucleus suggest that it might be disintegrating.
It was likely about magnitude +8 when I photographed it last night, April 9th, near Star 42 Camelopardalis. I'm not sure what the faint nebulosity is to the lower left of the comet: either Dark Nebula HSVMT 25, integrated flux nebula (IFN), or it's simply an artifact. Galaxy NGC 2366 is also apparent in the upper right corner.
Acquisition details: Fujifilm X-T10, Samyang 135mm f/2.0 ED UMC @ f2.0, ISO 1600, 50 x 30 sec, tracking with iOptron SkyTracker Pro, stacking with DeepSkyStacker (used comet stacking mode so stars and comet were stacked separately and then combined), editing with Astro Pixel Processor and GIMP, taken in the 30 minute-window between astronomic dusk and the rise of the 93% illuminated moon on April 9, 2020 under Bortle 3/4 skies.
The 'W' of Cassiopeia has always been one of my favorite constellations - maybe because I could always spot it as a kid.
This extent contains the middle three stars of the 'W' - Ruchbah (blue, bottom), Navi (blue, upper left), and Shedar (yellow, upper right). The center star of the 'W', Navi, illuminates the Gamma Cassiopeiae Nebulae (IC 59 and IC 63) a combination of red emission and blue reflection nebulae. The red/pink emission nebula below Shedar is the Pacman Nebula (IC 11 or NGC 281). And to the right of Ruchbah is the Owl or E.T. Cluster (NGC 457); the owl or E.T. is upside down here.
Fujifilm X-T10, Samyang 135mm f/2.0 ED UMC @ f2.0, ISO 1600, 35 x 60 sec, tracking with iOptron SkyTracker Pro, stacking with DeepSkyStacker, editing with Astro Pixel Processor and GIMP, taken on Oct. 23, 2019 under Bortle 3/4 skies and thin cloud cover.
Thin cloud cover was present most of the time that I imaged and acted as a diffusion filter for the larger stars. I kind of like this effect that emphasizes big stars, especially for this extent where the nebulae are fairly small for a focal length of 135mm, although I'd always prefer clear skies to a natural diffusion filter. Even though my tracking was spot-on (good balance, polar alignment, and a charged SkyTracker), I wasn't able to use about half of my subs because of clouds.
M90 Galaxy found in the constellation of Virgo.
M: Pegasus NYX-101
T: WO GTF81 Refractor
C: ZWO ASI533MM-Cooled
G: OAG and PHD2
GC: ZWO ASI120MC
RAW16; FITs
Temp: -10 DegC
R: Gain 100; Exp: 10 x 300s
G: Gain 100; Exp: 6 x 300s
L: Gain 100; Exp: 10 x 300s
Frames: 26 Lights; Darks/DarkFlats/Flats
Total Exposure: ~2.17 hours
50% Crop
Capture: NINA
Processed: APP LRG[No 'B']; PS.
Sky: 90% moon, no breeze, no cloud.
Very weak and identified in 1954 on photographic Plates as a Milkyway satellite.
Esprit 100 f5.5 APO/Qhy16200 CCD @-20C.
98x300 sec IDAS-LP2 filter.
Imaged on: 13,14,15&16 May, 2018.
Knight Observatory, Tomar
M101 Pinwheel Galaxy
Equipment:
Celestron AVX
Baader Moon and Sky Glow with IR cut filter
ES ED 102 FCD 100 Scope
SSAG Cope and Camera
ZWO 183mc Pro
Pegasus Focus Cube
Software:
SGP Acquisition
Sharp Cap - Initial Focus and Polar Align
AstropixelProcessor for stacking and initial stretch
Finished in Photoshop
I'll have to look to see how much integration.
Bortle 4.6 Location
Alt-az
10 second subs
347 subs
Stacked in AstroPixelProcessor, processed in PixInsight
imaged in July 2024 from Linden, Blue Mountains, Australia
The Theta Musca Supernova Remnanant-G304.4-3.1
this is a recently discovered SNR (first imaged in high resolution just over a year ago by Bray Falls)
The object is huge and too big for the small sensor of my imaging camera, so I will have to re-attempt with possibly my RedCat51 at some future point in time.
Equipment
HEQ5/ASIAIR/Sharpstar Z4/Antlia 3 nm Ha Filter/Optolong 3nm OIII filter/ZWO ASI533MM Pro
Integration
16 hours in OIII (10 minute subs)
4 hours in Ha ( 10 minute subs)
Location
Bortle 6
imaged over multiple nights in July 2024
Processing notes
Ha and OIII data stacked in AstroPixelProcessor.
Ha and OII integrations registered in APP.
Processed in PixInsight
Dynamic Crop
Graxpert for gradient removal (for some reason GraXpert did a better job IMHO than my usual goto ADBE )
BlurX-correct
BlurX default
Starnet++
SetiAstro NB to RGB script to convert Ha and OII star masks to star layer -only mild stretch (4.0) applied
NoiseX on starless images
GHS for starless layer. Had to experiment to not overstretch the data especially Ha and swamp the image with ha signal
Linear Fit
HOO image constructed with PixelMath
Red- Ha
Green- 0.2 Ha +0.8 OIII
Blue-OIII
mild curves transformation
star layer added using Pixelmath
Narrowband Normalisation
BlurX
NoiseX
levels adjustment in Photoshop CS
Comment
Images published on the web tend to show the oxygen areas in an electric blue and the Ha areas in a hue closer to pink
while it was possible to achieve this colour palette by using adjustment layers (Hue/Saturation, colourise) I have chosen to go with the image more or less as it emerged from PixInsight
IC443, the Jellyfish Nebula on the right is the remnant of a Supernova that occured around 10.000 years ago. A (the?) resulting rapidly spinning Neutron star or pulsar CXOU J061705.3+222127 is found today at the indicated location. The nebula to the left is IC444. This image in H Alpha light was made with an Esprit100 f5.5 refractor/ QHY16200 CCD camera (cooled to -20C). 35 x 15 minutes (8.8 hrs), integrated with Astro Pixel processor and processed further with Pixinsight. Image dates: 6,7,9 and 10 November 2017.
Info about the Pulsar: www.space.com/31442-jellyfish-nebula-mysterious-pulsar-im...
Knight Observatory, Tomar
D5300 - unmodded
300mm f/2.8 AF-S
SW HEQ5
Captured with APT, Processed in APP, Gimp
10 - Lights, 90sec, ISO400, f/4
10 - Darks
10 - Flats
10 - Bias
NGC 7822 is a beautiful emission nebula in Cepheus, well-known and popular for its shape and the dark nebulae running through it.
Thanks to good weather three weeks ago, I was able to collect 17.5 hours of data at f/2 for this SHO version. When it comes to color, I like the classic processing in the style of the Hubble Telescope, but this slightly more modern color scheme also has its charm.
Celestron RASA 8
Celestron Motorfocus
EQ6-R Pro
TS 2600 MP (Gain 100, Offset 200, -10°)
Baader H-Alpha Highspeed 3.5nm: 178 × 120″ (5h 56′)
Baader O-III Highspeed 4nm: 174 ×120″ (5h 48′)
Baader S-II Highspeed 4nm: 176 × 120″ (5h 52′)
Total: 17h 36′
Bortle 5 (19.50 SQM)
N.I.N.A., Guiding with ZWO ASI 120MM and PHD2
Astropixelprocessor, Photoshop, Pixinsight
IC 5070, the Pelican Nebula in the constellation Cygnus in the light of hydrogen. 72 frames, 300 sec. each (6 hr. total). Explore Scientific ED102 0.1m f/7 refractor, Stellarvue 0.8x reducer/flattener, ZWO ASI294MC Pro cooled camera, 7nm H-alpha filter, iOptron CEM25P mount, auto-guided, ASIAir controller. Processed in Astro Pixel Processor, Lightroom, and Photoshop.
#astrophotography, #deepsky
10*180s subs = 30 minutes total integration time. Using the Avalon m-zero mount with near perfect guiding, amazing considering I guestimated polar alignment. Imaging telescope was the William Optics GT71 with FF 6A2 that I have finally got working with correct back focus. Still some walking noise from the bad PA,
Camera was the ASI1600mm at 0 degrees. Calibrated lights only in APP.
Again balcony astro, Brisbane city, Bortle 8 and a full moon.
This color image was made with the Mono CCD camera and R, G and B filters. Because the Comet is moving fast all the 103 images made with the three different filters had been shifted and had to be re-aligned before stacking. A second stack was made to only show the stars. The 2 stacks have been combined and processed further.
AstroPixelProcessor: Calibration of the sub frames with Bias frames, Dark frames, flat frames and the Bad Pixel Map.
Pixinsight: StarAlignment, CometAlignment, Separate ImageIntegration for R, G, B for stars and comet. BackgroundCorrection, Histogramtransformation (Black point clipping for starcombined image), Pixelmath combination for starimage and Comet image, ,Platesolver script, Arcsinh Stretch, histogram stretch, curves adjustments, Image annotation script, annotations,
Knight Observatory, Tomar, Portugal
This Rosette Nebula image is a stack of 19x15 minute H-Alpha images taken with Esprit 100 Refractor and QHY16200 CCD camera. The stack is part of a work in progress for a HaRGB image.
Image dates 10,11,12 and 13 November 2017.
Knight Observatory, Tomar
Galaxy IC342 can be found in a dusty region, 10 degrees from the Galactic Equator but that dust is not very bright. Almost all IC342 images show just the Galaxy, not the dust in the surrounding region. It was not my intention to image that dust, but when i made a luminance stack with all the 271 (300 second) subs i had, there it was....
The inverted image is annotated and i added surface brightness data for a couple of faint Galaxies. KK35 or PGC166077 with a surface brightness of 26.85 mag/arcsec² was thought to be a Dwarf Galaxy but it most likely is an outher region of IC342.
Esprit 100 Refractor/ QHY16200 CCD @-20C.
271x300 sec Luminance (22.6 hrs)
Calibrated/ stacked with AstroPixelProcessor, post-processed with Pixinsight.
Image dates:
15,16,17,18 November 2017, 2,3,4,5,7,8,9,10,11,12 January 2019.
M81, Bode's Galaxy.
Taken with a 102mm F7 Meade APO and ASI533MC Pro.
80 x 180 Seconds exposures, 4 hours of total integration time.
Filters used are a Baader UV/IR Cut Filter.
Image processing with AstroPixelProcessor and Pixinsight.
William Optics GT 71 with 0.8 field flattener.
ASI 294 MC Pro one shot colour CMOS camera.
Calibrated in AstroPixel Processor.
60 minutes total integration time
Camera Temperature -10degrees, gain at 300.
A pair of dark nebula in the Aquila constellation on a background of Milky Way consisting of countless stars of all magnitudes. This image shows 50438 stars.....
The annotated image (right) shows the deep red Mira variable RT Aql : www.aavso.org/vsx/index.php?view=detail.top&oid=1151
One distant Galaxy (PGC166630) is visible in this star rich field at 250 Million lightyear distance.
Esprit 100 refractor plus QHY16200 CCD camera on 10 Micron GM2000 mount in a Scopedome 2M. Software: Sequence Generator Pro, AstroPixelProcessor, Pixinsight.
Knight Observatory, Tomar.
The Lagoon Nebula is one of the brightest nebulae in the night sky - bright enough for some people to see with the naked eye as a hazy patch in the sky. Around 5,000 light years from earth, this giant interstellar cloud is a nursery for young stars. These baby stars heat up the nebula gas so much that it emits light - light we can see. We may not see much with our naked eye but with a little help and a little patience, we can see a whole lot more.
Calibrated images of the Lagoon Nebula were provided by iTelescope.net. In addition to providing access to their telescopes, iTelescope.net provides subscribing members with a combination of premium image sets (with the rights to use & post them) and webinars that show how to process them. Itelescope.net captured the images using their T71 telescope based in the dark skies of Chile. I handled the post-processing side with Astro Pixel Processor, Photoshop, Star Xterminator, and Topaz Sharpen and DeNoise AI.
Dati: 29 x 300 sec a gain 5 e offset 25 a -10° c + 70 dark + 25 flat e darkflat
Filtro Astronomik UV/IR Block L2
Montatura: eq6 pro
Ottica: Takahashi FSQ106
Sensore: QHY168C
Cam guida e tele: magzero mz5-m su Scopos 62/520
Software acquisizione: nina e phd2
Software sviluppo: AstroPixelProcessor e Photoshop
Sigma set at 70mm
Imaging from my north facing balcony with an Antlia HA filter.
60 * 120 second subs.
The ASI 1600 was at -5 degress and gain 300.
Captured using Nebulosity.
No PA for the Star Adventurer mount.
Real quick processing with AstroPixel Processor, lights only.
I played a bit with the Bodes and Cigar Galaxy again and cropped it a bit more too.
_____________________________________________________________________
Mount: SkyWatcher HEQ5 Pro
Guiding: ZWO ASI 120MM Mini USB 2.0 Mono Camera - Orion 50mm Guide Scope
Filter: Astronomik CLS CCD EOS APS-C Clip-Filter
Camera: Canon EOS 70D (full spectrum modified)
Askar 80 PHQ F7.5 Quadruplet Astrograph Telescope
Focal length: 600mm
Astronomik CLS CCD Clip Filter
20 x 360 seconds frames - ISO 800 - f7.5
2hr total Integration
Darks: 20 frames
Flats: 20 frames
Bios: 20 frames
DarkFlats: 20 frames
Bortle 5/6
Apps: N.I.N.A. > PHD2 > ASCOM
Processing: AstroPixelProcessor > PixInsight > Photoshop >Topaz > Photoshop
A region of active star formation in the constellation Cygnus glowing in the light of hydrogen gas. On the left is NGC 7000, also known as the North America Nebula, and on the right is IC 5070, a.k.a. the Pelican Nebula.
This is a mosaic of seven tiles, taken with two different astro cameras on three nights in July and August. Explore Scientific 0.1m f/7 telescope, ZWO ASI 294MC (one-shot color) and ASI 2600MM (monochrome) cameras, UV/IR cut fillter, iOptron CEM25P mount, ASIAir controller, auto-guided. Processed in Astro Pixel Processor and Lightroom.
#astrophotography #deepsky region of active star formation in the constellation Cygnus glowing in the light of hydrogen gas. On the left is NGC 7000, also known as the North America Nebula, and on the right is IC 5070, a.k.a. the Pelican Nebula.
This is a mosaic of seven tiles, taken with two different astro cameras on three nights in July and August. Explore Scientific 0.1m f/7 telescope, ZWO ASI 294MC (one-shot color) and ASI 2600MM (monochrome) cameras, UV/IR cut fillter, iOptron CEM25P mount, ASIAir controller, auto-guided. Processed in Astro Pixel Processor and Lightroom.
#astrophotography #deepsky
Dati: 31 x 480 sec ( 4.13 ore) gain 5 @ -10° c + 12 dark + 30 flat e darkflat
Filtro: Optolong l-enhanche
Montatura: EQ6 pro
Ottica: Takahashi FSQ106
Sensore: QHY168C
Cam guida e tele: magzero mz5-m su Scopos 62/520
Software acquisizione: nina e phd2
Software sviluppo: AstroPixelProcessor e Photoshop
Temperatura esterna: 21 ° C - Umidità 85%
On April 15th, 2023 minor planet (270) Anahita passed by galaxy NGC 4939. I captured this encounter with a remote telescope in Auberry, California. Unfortunately this was about 16 hours after the close encounter, but the minor planet is still in the field of view. To my suprise I found an other minor planet, which is the still unnamed (35954) 1999 KY15.
The image is a stack of 20 frames of 180 seconds each. The minor planets are only shown in 7 frames each, to better show the movement.
Equipment: Planewave 24" (0,61m) CDK, F=3962mm, f/6.5, FLI-PL09000 CCD camera, Mount: Planewave Ascension 200HR.
Processing with AstroPixelProcessor and Photoshop.
An animation of the movement can be found here: www.jmwill.de/deep-sky-aufnahmen.html#a2584
This extent contains eleven Messier objects (M 58, 84, 86-91, 98-100) and many other galaxies. Markarian's Chain is the string of galaxies in the center. My favorite is the Coma Pinwheel Galaxy (M 99) in the center of the upper right quadrant, with its interesting coma shape.
Acquisition details: Fujifilm X-T10, Samyang 135mm f/2.0 ED UMC @ f2.0, ISO 1600, 102 x 30 sec, tracking with iOptron SkyTracker Pro, stacking with DeepSkyStacker, editing with Astro Pixel Processor and GIMP, taken on Feb. 27, 2020 under Bortle 3/4 skies.
One of the objects I was able to photograph last night with some unusually clear sky after many cloudy nights, despite it being quite near the horizon. This is one of the more colorful regions of the Milky Way, called the Rho Ophiuchi nebula after the bright star within the blue cloud near the top. The brighter red star near the bottom is the brightest star in the constellation Scorpius called Antares, the Heart of the Scorpion. Much of the region is filled with dust, reflecting the light of nearby stars as well as some gas, mostly hydrogen, glowing because it's energized by the nearby hot stars.
Tech: 12 300 sec. exposures, Nikon 80-200mm f/2.8 lens @200mm, ZWO ASI294MC camera, iOptron CEM25P mount, processed in Astro Pixel Processor and Adobe Lightroom.
Some astronomy images leave me wondering if I can actually find the object (named in the title) in the picture. Like finding objects in clouds in our daytime skies, objects in astronomy pictures are sometimes easy to find and sometimes not. Admittedly, my first view of images from this scene gave me a similar feeling - I guessed because of the thick field of stars. So in processing, I removed the stars and BAM! There were the dragons and the egg they were fighting over.
Calibrated images of the Fighting Dragons of Ara and the Dragon's Egg Nebula were provided by iTelescope.net. In addition to providing access to their telescopes, iTelescope.net provides subscribing members with a combination of premium image sets (with the rights to use & post them) and webinars that show how to process them. Itelescope.net captured the images using their T71 telescope based in the Rio Hurtado Valley, Chile. This was especially helpful because the Dragons of Ara are visible in the Southern Hemisphere where I live in Colorado. After capturing, I handled the post-processing side with Astro Pixel Processor, Photoshop, Star Xterminator, Topaz Sharpen and DeNoise AI.
An image in Ha RGB
Located between Hadar and Rigel Kentaurus, this nebula has recently become quite a favourite for astroimagers
Location : Bortle 6
Equipment
Sharpstar z4/Antlia 3 nm Ha filter/ Antlia Triband RGB filter/ZWO 533 Mm pro -for H-alpha /6/533 MC pro for RGB colour/ASIAIR/HEQ5/ASIAIR
Data
4 hours in RGB (5 minute subs)
8 hours in Ha (10 minute subs)
20 minutes in RGB ( 60 second subs) -for stars
Processing
stacked in AstroPixelProcessor, processed in PixInsight
Processing Notes
Ha and RGB separately
Stack
register Ha, RGB long and RGB short stacks
Dynamic Crop
GraXpert
Blur X -correction
Image Solver
SPCC
Starnet++
Nebula
BlurX
NoiseX
GHS
NoiseX
Dark Structure Enhance ( for Ha only)
Curves Transformation
Stars
SetiAstro star stretch script
HaRGB image constructed using Foraxx utility in PI :
Synthetic OIII constructed as follows:
RGB image split into r,g and b
OIII=( 0,55*G +0.55*B)- 0.1*R
on the assumption that some red leaks into Blue and Green, 10 % is just a guess
Starless image in Foraxx constructed using Paulyman's script in PI
Curves Transformation after applying a luminance mask
Stars and starless combined with Pixelmath
Minor tweaking including a final crop - in Photoshop CS6
See also Starless version in Ha
First ever HARGB image taken with the ASI183MM and Antlia RGB HA 3.5nm filters.
The RGB sequences were taken in Nebulosity at 15 degrees as I could not get the software to cool the camera. NINA was used to capture the HA and it worked a treat. This is fabulous software and its free.
ASI183MM gain = 111
20 * 60 sec RED
20 * 60 sec GREEN
20 * 60 sec BLUE
12 * 600 sec HA.
Calibrated in Astro Pixel Processor.
Mount was the m-zero with just a rough PA so some walking noise in the shadows but hey, I am thrilled :)
This shows the output of the APP program after the automatic mosaic process. APP finds all overlaps (i used 15% for the SGP Frame and Mosaic wizard settings) and positions and the right orientation and distortion correction! I loaded a masterdark, bad pixel map and masterflat together with all the single light frames. Each panel is a single 15 minute H-alpha (7nm) exposure with QHY16200 CCD/ Esprit 100 f5.5 refractor) Again, this Flickr upload is a downscaled version at 12.5%, the full version is 600 megapixels.
Still need to do registration and background optimization.
Knigh Observatory, Tomar.
This H-alpha image mosaic shows only the Emission Hydrogen nebulae in a part of the Cygnus Constellation. The stars have been removed using a neural network.
Technical information:
telescope: Esprit 100 refractor
camera: QHY16200 CCD
filter:Baader 6nm H-alpha filter
Integration time: 25 hrs.
21 panel mosaic made with Astropixelprocessor, processed with Pixinsight and Starnet++
(This version is reduced in size, a test with the neural network software to process the nebulosity separated from the star image. After star removal the image is showing the nebulosity really well....
Sky-Watcher Quattro 150P f/3.5
QHYCCD Minicam8
HOO
60 x 60sec. Ha
48 x 60sec. OIII
Processed with Astro Pixel Processor, NoiseXTerminator and Affinity Photo.
Date: 2023-5-13,21,25, 6-14
Location: El sauce Observatory, Chile
Optics: R200ss,
Camera: ASI294MM-pro
Exposure: 6 panel mosaic
・P1 (L, R, G, B) = (164, 72, 68, 68)
・P2 (L, R, G, B) = (173, 70, 69, 69)
(gain 120, offset 5)
Processing: Pixinsight, AstropixelProcessor, Photoshop
We are looking at an individual star at 21 Million lightyears......
Discovered on 22 jan 2019 by ATLAS (Asteroid Terrestrial-impact Last Alert System) on Hawai.
48x300 seconds Luminance stack,6 February 2019 00:00-04:30
Telescope: Esprit 100
Camera: QHY16200 CCD @-20C
Processed: Astropixelprocessor/ Pixinsight.
Next to the enlarged inset is a 3D brightness plot showing AT2019abn in relation to forground stars.
Dati: 109 x 300 sec a gain 5 e offset 25 a -10° c + 70 dark + 25 flat e darkflat
Filtro Astronomik UV/IR Block L2
Montatura: eq6 pro
Ottica: Takahashi FSQ106
Sensore: QHY168C
Cam guida e tele: magzero mz5-m su Scopos 62/520
Software acquisizione: nina e phd2
Software sviluppo: AstroPixelProcessor e Photoshop
ZWO ASI2600MM, Chroma 3nm Ha/O3/S2 filters, Stellarvue 70mm scope with .8 FR on Orion Atlas Pro mount. Guiding. SGPro, PHD2, 24 x 5 min = 2 hours Ha and 12 x 5 min = 1 Hour O3 and S2 each. Pixinsight, Astropixelprocessor and Photoshop CC.
Fujifilm X-T10, Samyang 135mm f/2.0 ED UMC @ f2.0, ISO 1600, 42 x 60 sec, tracking with iOptron SkyTracker Pro, stacking with DeepSkyStacker, editing with Astro Pixel Processor and GIMP, taken just before astronomic dawn on Oct. 2, 2019 under Bortle 3/4 skies.
24-07-2020, 9 x 30 seconds Luminance, Esprit 100 telescope/QHY16200 CCD @-20C. Calibrated subs in AstroPixelProcessor, further processing in Pixinsight: Staralignment, Cometalignment, ImageIntegration, DynamicBackgroundExtraction, MaskedStretch, Curves, HDRMultiscaletransform
M101 is about 25 million lightyears away from us. Its spiral arms show several "knots" that are regions of star forming.
101 x 180s @ ISO 800
Pentax K3ii and TS 130/910 APO.
This is the version stacked with AstroPixelProcessor.
The Heart (IC 1805, right) and Soul (IC 1848, left) star-forming nebulae. A composite of 18 5 minute exposures, ZWO ASI294MC Pro camera, Nikon 80-200mm f/2.8 lens, 200mm, f/4, dual narrow-band filter (Hα+[O III]), iOptron CEM25P mount, ZAO ASIAir controller, ZWO ASI120MM Mini guide camera and Astro-Tech 60mm f/4 guide scope.
Dati: 36 x 4 min. 800 Iso + 15 Dark + 25 flat e darkflat software: AstroPixelProcessor e Photoshop CS2 Strumenti: ottica Takahashi FSQ106 f/5 su Skywatcher EQ6 pro - Canon 40D CentralDS. 12/08/2020 - Castelletta (AN), Temp. esterna: 20° C temperatura al sensore 0,00°C - Umidità 79%
The Ursa Minor Dwarf Spheriodal Galaxy is the faintest known member of the local group of Galaxies with a surface brightness of 25.5 V-mag/arcsec^2. (ref 3). Distance is 225000 lightyears (ref 1)
RA: 15h09m08.5 / Dec: +67d13m21
Imaged on 4,5,6,10 & 11 May, 2018
Esprit 100 APO Refractor+QHY16200CCD @-20C/ IDAS LP2 filter.
Knight Observatory, Tomar
ref 1) en.wikipedia.org/wiki/Ursa_Minor_Dwarf
ref2 ) www.space.com/15619-faintest-globular-star-cluster.html