View allAll Photos Tagged Subframing
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Photographed outside Uluṟu-Kata Tjuṯa National Park, Northern Territory, Australia (440 km by road southwest of Alice Springs), long. 131.04° E., lat. 25.22° S., between 01.53 and 02.26 CAST (Central Australian Standard Time)
* Altitude of centre of frame at time of exposures: 70°
* Temperature 10° C.
* Total exposure time: 16 minutes
* 35 mm focal length wide angle lens
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Description:
The centre of our home galaxy, the Milky Way, lies in the constellation Sagittarius, in the middle of the prominent bulge of stars and nebulae in this view, made with a wide angle 35 mm lens. Numerous star clusters, dark foreground gas clouds, and pink hydrogen gas nebulae are strewn across the frame.
The centre of the Milky Way lies very low on the horizon as seen from the northern hemisphere. Astronomers travel to the south in order to see the magnificence of the Milky Way straight overhead in the months of May-August.
This is the telescope and mount that I used for my astrophotography on this trip:
www.flickr.com/photos/97587627@N06/28602350028
For a version of this photo WITH LABELS, click on your screen to the RIGHT of the photo, or click here:
www.flickr.com/photos/97587627@N06/42246055924
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Technical information:
Sigma 35mm f/1.4 DG HSM ART Lens on Nikon D810a camera body, mounted on Sky-Watcher HEQ5 equatorial mount with Kirk Enterprises ball head
Sixteen stacked subframes - each frame:
ISO 2500; 1 minute exposure at f/4, 35 mm focal length, unguided (with LENR - long exposure noise reduction)
Subframes stacked in RegiStar;
Processed in Photoshop CS6 (levels, brightness, contrast, colour balance)
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NGC 3718, also know as ARP 214, is a distorted spiral galaxy in the Constellation Ursa Major and is located about 59 Million Light Years away. Its distorted form is thought to be gravitational interaction with the other galaxy seen in this image - NGC 3729 - at some point in the distant past. These are all part of a group of galaxies known as the Ursa Major Cluster.
One interesting footnote - below NGC 3718 you can see a small grouping of elongated shapes, very close together. While not shown very well in this image, this is a small group 5 galaxies known as Hickson 56. These Galaxies are estimated to be about 400 Million Light Years away!
These galaxies are very far away and very small. The largest here only measure 2.9" x 2.4" in size. I mention this because I really don't have a scope that is setup for these very small galaxies. SO why did I chose this target? Well, part of me wanted to see what I could do with it. Another part is that this time of year the number of targets is a bit limited - especially what I can access due to the tree lines on my property.
This is the third and last image to come out of my 3 night imaging cycle starting on June 4th. While we had three clear nights, we also had some bands of thin clouds that came through and the overall sky transparency was far from great. The thin clouds are not enough to lose a guide star and disrupt your runs, but they can ruin the contrast on critical subframes. In this case, I had to remove roughly 1/3 of my subs and it reduced the number of Green frames I ended with to less than half what I had for the other channels.
When first processed this image - it looked pretty bad. So I went back to square one, and this time I spent a huge amount of time working on the image deconvolution step. Some people think of deconvolution as a "Sharpening" step. In fact it does something quite different. Working it the frequency domain, it attempt to restore lost information caused by the optics. This is very tricky to use properly and for my first year of astrophotography I could not get any good results out of this at all. Then I got some help from Gary Optiz and Dan Kutcha and I was able follow a "recipe" and get some small advantage to my images. This time though, I really dug into it - played around with every parameter and saw how it impacted the image. At the end of it all, I had finally figured out how to use it properly, and I had a version of the linear image that had more detail than I had before.
With this I went forward and processed the image doing the bulk of the work in Pixinsight, and then shifting to Photoshop for the last polishing phases. I also used Topaz Denoise AI, on a few trouble spots along the way.
In the end - I was happy with the final result - but I also knew that to get the results I really want here I need a few things: 1) a scope with more focal length and resolution 2) Clearer and more transparent skies. 3) and a lot more integration time.
Thanks for looking!
Pat
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Image Details
*Number of frames is after bad or questionable frames were culled.
53 x 120 seconds, bin 1x1 @ -15C, unity gain, ZWO Gen II L Filter
64 x 120 seconds, bin 1x1 @ -15C, Unity gain, ZWO Gen II R Filter
26 x 120 seconds, bin 1x1 @ -15C, unity gain, ZWO Gen II G Filter
46x 120 seconds, bin 1x1 @ -15C, unity gain, ZWO Gen II B Filter
Total of 6.3 hours
30 Darks at 300 seconds, bin 1x1, -10C, gain 100
30 Darks at 90 seconds, bin 1x1, -10C, gain 0
30 L Flats
30 R Flats
30 G Flats
30 B Flats
50 Bias
Capture Hardware:
Scope: William Optics 132mm F/7 FLT APO
Guide Scope: Sharpstar 66EDPHII
Camera: ZWO ASI1600mm-pro with ZWO Filter wheel with ZWO LRGB filter set,
and Astronomiks 6nm Narrowband filter set
Guide Camera: ZWO ASI290Mini
Focus Motor: Pegasus ZWO EAF 5V
Mount: Ioptron CEM 26
Polar Alignment: Ipolar camera
Software:
Capture Software: PHD2 Guider, Sequence Generator Pro controller
Image Processing: Pixinsight, Photoshop - assisted by Coffee, extensive processing indecision and second guessing, editor regret and much swearing….. Given the problems on this image, more than the usual whining….
Taken in Hydrogen Alpha just before 4pm as the sky was beginning to darken.
This is a stack of 29 subframes taken through my 130mm refractor using an Atik 460 EX mono camera and 0.75 reducer.
Peter
In the news today, AR2941 launched a CME that knocked out 40 Starlink satellites.
Canon EOS 60Da (1/640s, ISO 100)
TeleVue NP101is/2x Power Mate (4", f/10.4)
Losmandy G11
100 subframes captured with Backyard EOS (BYE). CR2 files converted to AVI by PPIP. Best 75% of frames stacked in AutoStakkert! Sharpened in Registax and finished in Photoshop.
Dwarf III smart telescope
661 15-second subframes
Soul with a Capital S - www.youtube.com/watch?v=OSCz31lcSxI
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Photographed at Algonquin Provincial Park, Ontario, Canada
(285 km by road north of Toronto)
* Temperature 12° C.
* Total exposure time: 8 minutes
* 1200 mm focal length telescope
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Description:
From Wikipedia:
"The Dumbbell Nebula (also known as Apple Core Nebula, Messier 27, M 27, or NGC 6853) is a planetary nebula in the constellation Vulpecula, at a distance of about 1,360 light years.
This object was the first planetary nebula to be discovered; by Charles Messier in 1764. At its brightness of visual magnitude 7.5 and its diameter of about 8 arcminutes, it is easily visible in binoculars, and a popular observing target in amateur telescopes."
What we are seeing is the visible remains of a low-mass star's expelled gaseous outer-envelope, leaving an X-ray hot white dwarf at the centre.
Stars to about 17th magnitude are visible in this image. The central star in the nebula is magnitude 14.0.
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Technical information:
Nikon D810a camera body on Explore Scientific 152 mm (6") apochromatic refracting telescope, mounted on Astrophysics 1100GTO equatorial mount with a Kirk Enterprises ball head
Eight stacked subframes; each subframe:
1200 mm focal length
ISO 4000; 1 minute exposure at f/8; unguided
(with LENR - long exposure noise reduction)
Subframes registered in RegiStar;
Stacked and processed in Photoshop CS6 (levels, brightness, contrast, sharpening)
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A widefield shot of the ρ Ophiuchi - Antares region showing red emission nebulae, blue and yellow reflection nebulae and dark clouds and tendrils of gas and dust. At the right, above the bright star Antares, is globula cluster M4 which is the nearest to us.
This image is an integration of 105 x 2 minute subframes taken with a QHY268C OSC camera and a WO Redcat51, Image sequencing was managed via SGP and PHD2, all post-processing was carried out in PixInsight.
Observed from Prachinburi, Thailand
Narrowband (Ha Sii Oiii) combination using SHO palette. Processed in Pixinsight and Photoshop, and enhanced in Lightroom.
The weather has still remained bad, so I have been limited in what I can capture (it doesn't help that it's low in the sky and goes behind houses by midnight). I processed what I managed to capture this week.
Doing 5 min exposures, 100 gain. 12xOiii, 6xHa, and only a couple Sii. Given the results from that amount of subframes, I'm looking forward to what I can do when the weather improves.
Equipment: Skywatcher Esprit 100ED, HEQ5-Pro mount, ASI 2600MM Camera, and I had to temporarily switch to .67x flattener because my SkyWatcher one has issues.
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Photographed at Algonquin Provincial Park, Ontario, Canada
between 02.24 and 02.44 EDT
(285 km by road north of Toronto)
* Altitude of centre of frame at time of exposures: ~12°
* Temperature 14° C.
* Total exposure time: 10 minutes
* 660 mm focal length telescope
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Description:
North is to the upper right in this image, which contains several objects of note.
M8, the Lagoon Nebula, with embedded star cluster NGC 6530 (right side of the frame)
One of the most prominent, large, bright and well known nebulae in the sky is the Lagoon Nebula (M8), which is a favourite target of amateur astronomers with modest telescopes.
From Wikipedia: "The Lagoon Nebula ... is a giant interstellar cloud ... classified as an emission nebula and as an H II region. [It] was discovered by Giovanni Hodierna before 1654 and is one of only two star-forming nebulae faintly visible to the eye from mid-northern latitudes. Seen with binoculars, it appears as a distinct oval cloudlike patch with a definite core. Within the nebula is the open cluster NGC 6530.
The Lagoon Nebula is estimated to be between 4,000-6,000 light-years away from the Earth. In the sky of Earth, it spans 90' by 40', which translates to an actual dimension of 110 by 50 light years. ... The nebula contains a number of Bok globules (dark, collapsing clouds of protostellar material), the most prominent of which have been catalogued by E. E. Barnard as B88, B89 and B296."
IC 4678 (directly above M8)
This is a tiny nebula composed of emission (pink) and reflection (blue) components.
NGC 6544 (near centre of frame)
This is a small globular star cluster of magnitude ~7.3, lying at a distance of 9,000-10,00 light years from us..
NGC 6553 (left edge of frame, just below centre)
This is a globular star cluster of magnitude ~8.@, with an unusually low star concentration even at its centre, and lying about 19,600 LY from our solar system. Studies show that it underwent two distinct periods of star formation, resulting in two populations of stars with differing compositions, especially in sodium and aluminum.
For a version of this photo WITH LABELS, click on the RIGHT side of your screen, or click here:
www.flickr.com/photos/97587627@N06/52229322166
To see a wider angle view this and other adjacent nebulae, photographed in Australia in Sept. 2019, click here:
www.flickr.com/photos/97587627@N06/49183970671
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Technical information:
Nikon D810a camera body on Tele Vue 127is (127 mm - 5" - diameter) apochromatic telescope, mounted on Astrophysics 1100GTO equatorial mount
Ten stacked frames; each frame:
660 mm focal length
ISO 2500; 1 minute exposure at f/5.2; unguided
With long exposure noise reduction
Subframes stacked in RegiStar;
Processed in Photoshop CS6 (levels, brightness / contrast, colour balance)
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Conet C/2020 F3 (NEOWISE) velow the Big Dipper, or in the claws of the Great Bear.
Stack of four subframes, each a 30 second exposure taken with a Canon EOS 550D at ISO 1600, 13mm, f/4.0, Cokin P820 diffusor, tracked with the Vixen Polarie star tracker.
These are two images of Neptune taken in the early evening of 19 November. On the left a LRGB video sequence of the best 40% of frames at 15fps for luminance and 12fps for Red, Green and Blue and on the right a stack of 400 luminance subframes at 5 seconds per frame converted from video to still images and stacked to enable the much fainter Triton to be picked up in the imaging. It has also blown out the size of Neptune in consequence although both images were taken at the same magnification.
Neptune is a tricky target at the best of times for close-up imaging. For a variety of reasons from technical equipment issues to weather conditions this is the first time I've successfully managed to pin down a reasonable image of Neptune and Triton in 2017.
Peter
Equipment:
Cooled ZWO ASI174MM mono CMOS camera, LRGB filters, 300mm f/10 LX200 SCT, EQ8 mount.
This is a two-panel mosaic of the large California nebula using my 80mm refractor and an Atik Horizon colour camera. This is two stacks of eight-minute subframes, fifteen in total.
Peter
This is the first time I've tried this target with a colour CMOS camera. It was very much a test to see how it would behave pointed at bright stars as some colour CMOS cameras have suffered from reflections and micro-lensing on bright stars.
Normally I rely on mono CCD and CMOS to get the best detail but this is one of the new generation of colour CMOS camera using a Panasonic chip and properly designed to avoid any amp glow. In this image I haven't used flats or darks although I had them available if needed.
The image is a stack of 28 three-minute subframes.
Peter
Equipment:
Atik Horizon CMOS colour camera, 80mm triplet APO, EQ8 Mount.
Technically Messier 16 is the star cluster in the centre of this image and was one of the early night sky targets distracting Charles Messier in his hunt for comets. It is now better known as the Eagle nebula for the dark bird-like shape in the nebulosity surrounding the cluster. The Eagle shape itself is thanks to the famous Hubble telescope image now more commonly known as the central part of the pillars of creation.
This is a stack of eleven five-minute subframes taken through my 300mm f/10 SCT using an Atik Horizon colour CMOS camera.
Peter
Seen on Gt. Yarmouth seafront.
Frame: Steel trellis, cast aluminium rear subframe
Length: 86.6 in. (2,200 mm)
Height:
Width:
Wheelbase: 63.58 in. (1,615 mm)
Seat height: 29.72 in. (755 mm)
Dry weight: 485 lb. (220 kg)
Curb weight: 544.5 lb. (247 kg)
Front suspension: Adjustable 1.97 in. (50 mm) fork
Rear suspension: Single shock absorber
Front brake: Twin 12.6 in. (320 mm) discs, ABS
Rear brake: Single 10.43 in. (265 mm) disc, ABS
Front tyre: Pirelli Diablo Rosso II, 120/70 ZR17
Rear tyre: Pirelli Diablo Rosso II 240/45 ZR17
Fuel capacity: 3.96 gal. (18 litres)
Engine: 1,262 cc, (77 cu. in.) Ducati Testastretta DVT, L-twin, four stroke, fuel injected, liquid cooled
Engine output: 152 hp (110.9 kW) at 9,500 rpm
Gearbox: 6 speed constant mesh
Top speed: 169 mph (272 km/h)
This is a relatively short stack of eight 480 second subframes (plus flats and darks) taken with a one-shot colour camera before the inevitable cloud moved in this evening (25th February). M97 was nicknamed the 'Owl' when Lord Rosse first observed it with one of his large telescopes at Birr. It was discovered by Pierre Mechain, Charles Messier's assistant and colleague, who added most of the later Messier catalogue items. Curiously, Messier's catalogue was actually a compilation of objects that they didn't want to be distracted by and mistake for a comet!
Below and to the left edge of M97, partly obscured by a star in our galaxy, is faint magnitude 16 galaxy PGC 34279.
Peter
Equipment:
ZWO ASI071 MC Pro CMOS camera, Baader S narrowband filter, 356mm f/10 LX200 SCT, EQ8 mount. Autoguided off-axis with a Lodestar X2 CCD.
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Photographed at Torrance Barrens Dark Sky Preserve, Ontario, Canada (200 km by road north of Toronto)
* Temperature 0° C.
* Total exposure time: 6 minutes.
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Description:
I didn't have enough time before I had to pack up my gear and drive two hours back to my home in the city to make more than six subframes for this photo. I would have liked at least ten. So the resolution is not as good as I'd like it to be, but I think that it's not a bad image.
The Rosette Nebula, which lies about 5,000 light years from Earth, is located just to the east of the constellation Orion, and is in the centre of the (northern hemisphere) winter Milky Way. It can just barely be glimpsed in binoculars from a dark-sky location far away from city lights.
From Wikipedia:
"The Rosette Nebula (also known as Caldwell 49) is a large, spherical, H II region located near one end of a giant molecular cloud in the Monoceros region of the Milky Way Galaxy."
For a version of this photo WITH LABELS, click on your screen to the RIGHT of the photo, or click here:
www.flickr.com/photos/97587627@N06/32743250460
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Nikon D810a camera body on Teleview 101is apochromatic refracting telescope, mounted on Astrophysics 1100GTO equatorial mount.
Six stacked frames; each frame:
* 540 mm focal length
* ISO 3200; 60-second exposure at f/5.4; unguided
(with LENR - long exposure noise reduction)
Stacked in RegiStar;
Processed in Photoshop CS6 (brightness, contrast, levels, colour balance)
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167/366,
From my TV
I was there in 1978; youtu.be/CJC_4kup0fs?si=0N_1MAmqmSEgooy7
Watched live on YouTube in Garden Village, Burnaby, British Columbia, Canada
Won by Nickas Nielsen, Antonio Fuoco and Miguel Molina in the No. 50 car.
Ferrari AF Corse Hypercar
449P
The car's 2,992 cc (182.6 cu in) twin-turbocharged V6 engine architecture is shared with the Ferrari 296 and its Group GT3 counterpart, the 296 GT3. However, instead of being mounted to the subframe as in the road-going vehicle, the engine is a fully stressed member in the 499P, and has had various modifications to accommodate its new role as a stress-bearing member. The 499P has semi-permanent all-wheel drive, with an electric motor situated at the front axle, providing 200 kW (272 PS; 268 hp) above 190 km/h (118 mph) (as stipulated by the regulations), and is connected to a bespoke 900 V battery pack, with the ability to be recharged by Ferrari's own Energy Recovery System (ERS)
SH2-119 is an often overlooked nebula just east of the North American and Pelican nebula. It is quite a bit fainter, but also covered with masses of stars, which overwhelms the nebula itself. The large star at it’s centre is 68 A Cyg which resembles a pearl within the Clamshell.
Taken over four nights in August, comprising Sii, Ha and Oiii narrowband filters of 5 minute and 10 minute subframes totalling 10h hours, plus 30 minutes 30 second subs of RGB for the stars. A challenge to process, particularly with the mass of stars. I think this could really benefit with at least 12 to 15hrs total exposure but not much chance with the current run of cloudy weather. This particular SHO palette is from a quite complicated Pixelmath expression in Pixinsight that produces a reddy orange instead of yellow. Star reduction to reveal the nebula.
30 x Darks, Flats and Bias
Astromiks 50mm SHO 6nm Filters and RGB Filters
ZWO ASI6200MM Pro
ZWO 7x2" EFW
ZWO EAF
Williams Optics GT81 IV
Williams Optics 6A III Field Flattener 0.8
Williams Optics 50mm Uniguide guide scope
ZWO ASI 120MM-S
HEQ5 Pro Rowan
ASIAIR Pro
Astro Pixel Processor
Pixinsight
Photoshop 2021
Topaz DeNoise
The Lagoon Nebula (M8) and The Trifid Nebula (M20) in the constellation Sagittarius, just north west of the center of the Milky Way. The Lagoon Nebula is a giant star-forming region while The Trifid Nebula is a combination of an emission nebula (red), a reflection nebula (blue) and dark nebula (brown-black regions dividing the emission nebula into three parts). I was only able to capture 11 x 10' subframes before the field of view got too low in the sky and the sun started to rise. Captured using an AT65 refractor, an SBIG ST4000 XCM camera at -5 C and a Losmandy G 11 mount on July 7, 2016.
Spiral Galaxy in sculptor
Taken at home (Santiago de Chile)
GSO RC 12" on top of a Mi250 mount
Atik383L camera - filter wheel and astrodon filters
ACP-Maxim-focusmax for capture PixInsight for processing
RGB(10h,11h,12.5h) in 10 min subframes
IC 4592 is a large blue reflection nebula lit by the light from the multiple star system ν Scorpii - the brightest star in the frame, just below center.
This photo is another framing failure - the nebula is commonly known as the Blue Horsehead but I have truncated the horse's muzzle (at bottom right). It needs a wider field of view, or a mosaic - I'll maybe try again next year.
Anyway, this image is an integration of 211 x240s subframes captured on a QHY168C OSC with WO Zenithstar 103 scope. An STC multispectra LP filter was used. Imaging was controlled via SGP and PHD2, all post-processing was with PixInsight.
Observed from Prachinburi, Thailand
Manufacturer: Auto Union AG / August Horch Automobilwerke GmbH, Zwickau - Germay
Type: 853A Sport Cabriolet
Engine: 4944cc straight-8
Power: 120 bhp / 3.400 rpm
Speed: 135 km/h
Production time: 1938 - 1939
Production outlet: 342
Curb weight: 2631 kg
Special:
- The basic 853 is designed by Horch chief-designer Günther Mickwausch.
- The 853A differs from the 853 through the shortened frame (5 cm) and a renewed subframe to support the radiator. This was done, so other coachbuilders (like Gläser, Baur, Erdmann & Rossi, etc.) could put on easier a Convertible or Coupe.
- The 853A also had a new engine with 120 bhp (instead of 100bhp), a renewed front, a new front suspension with double wishbones and used a DeDion axle rear suspension.
- The most beautifully styled Sport Cabriolet of their era was although expensive, they were cheaper than their Mercedes-Benz rival, the 540K.
- Auto Union was comprised of Horch, DKW, Audi and Wanderer since 1932.
- It has a four-speed manuel gearbox with overdrive by ZF.
- This automobile could be delivered in the colour "Fischsilber" ("silver fish"), a metallic paint in four colours (contained finely ground fish scales).
- When World War II began, production of the Horch Automobiles ceased.
Added to the gallery www.flickr.com/photos/stevepoe/galleries/72157639107186833
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Photographed from mid-town Toronto, Canada, at 18.43 EST (Moon altitude: 57° | Sun 14° below the horizon)
* Temperature 4° C.
The sky was reasonably clear, with some thin cirrus cloud, when I was able to get the ten base subframes that make up this view of the Moon high over Toronto early on this mild January evening before the heavier cloud moved in.
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Nikon D850 camera body on Explore Scientific 152 mm (6") apochromatic refracting telescope, mounted on Sky-Watcher AZ-EQ6 SynScan mount.
Best ten of fourteen identical stacked frames; each frame:
* ISO 100, 1/120 sec. exposure
Stacked in Registax
Processed in Photoshop CS6
(brightness, contrast, sharpening on right side of Moon)
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Photographed at Algonquin Provincial Park, Ontario, Canada, between 00.37 and 01.12 EDT
(285 km by road north of Toronto)
* Altitude of nebula at time of exposures: 63-58°
* Temperature 2° C.
* Total exposure time: 15 minutes
* 660 mm focal length telescope
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Description:
This huge ionized hydrogen gas cloud lies about 2,400 light years from our solar system. The nebula itself is named Sharpless 131; the large open cluster of stars near its centre is cataloged as IC 1396 or Trumpler 37. Below and to the right of centre is a small, prominent globule that is often referred to as the "Elephant's Trunk Nebula" (IC 1396a), and is an active star-forming region.
Here is another view of this object, made with a slightly smaller telescope almost exactly one year ago:
www.flickr.com/photos/97587627@N06/36698969403
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Technical information:
Nikon D810a camera body on Tele Vue 127is (127 mm - 5" - diameter) apochromatic astrograph, mounted on Astrophysics 1100GTO equatorial mount
Fifteen stacked subframes; each frame:
ISO 8000; 1 minute exposure at f/5.2, unguided
(with LENR - long exposure noise reduction)
Subframes stacked in RegiStar;
Processed in Photoshop CS6 (levels, brightness / contrast, bright star flare reduction)
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Photographed at Algonquin Provincial Park, Ontario, Canada
(285 km by road north of Toronto)
between 23.55 Aug. 1 and 00.11 EDT Aug. 2
* Altitude of centre of frame at time of exposures: ~70°
* Temperature 17° C.
* Total exposure time: 8 minutes
* 105 mm focal length lens
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Description:
High in the northern hemisphere summer sky, the gossamer band of our Milky Way galaxy passes through the constellations Cepheus (to the left) and Cygnus (to the right). This area of the sky is rich with red-pink clouds of glowing ionized hydrogen gas, as well as numerous star cluster and foreground clouds of dark gas.
The distinctively shaped north America Nebula in Cygnus appears in the lower right. The large gas cloud IC 1396 in Cepheus is in the opposite corner. At the upper left edge of IC 1396 is Herschel's Garnet Star, with its striking ochre-orange colour.
For a version of this photo WITH LABELS, click on your screen to the RIGHT of the photo, or click here:
www.flickr.com/photos/97587627@N06/48527625751
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Technical information:
Nikkor AF-S 70-200 mm f/2.8 G ED VRII lens on Nikon D810a camera body, mounted on Astrophysics 1100GTO mount with a Kirk Enterprises ball head
Eight stacked subframes; each frame:
105 mm focal length
ISO 6400; 1 minute exposure at f/4.5, unguided
(with LENR - long exposure noise reduction)
Subframes stacked in RegiStar;
Processed in Photoshop CS6 (levels, brightness, contrast, colour balance)
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The Trifid nebula (M20/NGC 6514) at top with the huge Lagoon nebula (NGC 6523) below with several smaller HII regions over at bottom left.
This picture is a mosaic of two panes, each pane being an integration of multiple subframes shot with a William Optics Zenithstar 103 scope and QHY168C OSC camera; an STC multi-spectra LP filter was used. The upper pane is an integration of 236 x 180s frame, the lower pane is 183 x 180s.
Imagiing was managed via Sequence Generator Pro and PHD2, all post-processing was carried out in PixInsight.
Observed from Prachinburi, Thailand
The ongoing re-development on West Quay Road (the waterfront-291 luxury flats).
For this week's Flickr Friday theme "sub framing" a Poole 27.07.2023
Comet Lovejoy, January 12, 2015. This is 11 300 second subframes stacked for each of red, green, and blue channels, for 2.75 hours of total imaging.
I'm no expert at comet photography, but as a novice, I'm happy with this result.
I took this image just at the end of astronomical dark on April 10,2021 in the Gila National Forest, New Mexico, USA.
The Lagoon Nebula is about 5200 light years from Earth. It is the remnant of an exploded star and as such is a new star forming region - look at all those young (1-2 million years) hot white stars recently formed through gravitational coalescence near the center of the magenta colored cloud. The nebula is an emission nebula, meaning it emits lots of light at the Hydrogen alpha wavelength of 656 nm in the deep red. Other emission lines in the blue from oxygen, mix with the red to make a brilliant magenta. The emission is produced when ionized atoms recombine with free electrons. The atoms become ionized (or driven into an excited state) by ultraviolet light emitted by one or a few of the brighter stars. One in particular, 9 Sagittarii, is nearly 25,000 times brighter than our Sun. The Lagoon nebula is one of several great examples where we can see the life cycle of stars in one image. BTW that’s the Trifid Nebula in the upper right part of the image.
If you can find a really dark place, it is just barely visible to the naked eye ( I was able to see it after the core of the Milky Way was up). It is easily seen in binoculars or a small telescope but still appears gray since the most sensitive part of our retinas don’t see color. It is often seen in wide angle night scape photos of the Milky Way over the landscape and can be easily photographed with a tripod, a normal camera lens and a few seconds of exposure. Look for a purple region.
Photo info: Subframe images collected the early morning hours of April 10, 2021 in the Gila National Forest, New Mexico, with a Takahashi FSQ EDX4 telescope and ZWO ASI6200MM cooled 62 megapixel CMOS camera and Chroma filters on a Sky Watcher EQ6 auto-guided equatorial mount under control of a Raspberry Pi computer. The 18 one minute subframe images were calibrated, debayered, registered, integrated and post processed in PixInsight. About 3 hours before these images were taken my autoguider camera failed (bad cable?) so I took these images unguided but limited the exposure to 1 minute since this mount is not great. The image is cropped to about 40% of the original area.
I didn’t do any artificial enhancement to this image to “create art”. I think it is hard in a few minutes to improve on what Mother Nature did over billions of years.
As always please feel free to share any of my images.
CaliforniaNebula_NGC1499, captured 2015-09_20, camera: SonyA7s (centralDS modded and cooled) 52 subframes a 300sec IDAS-V4, scope: RASA 11" F/2.2, mount: EQ8, Guiding_scope, processed with PixInsight (registration), CCDware (stacking and deconvolution), Photoshop CS6 (final cosmetic corrections), Tenerife, 1180 m altitude.
This is a look in Hydrogen Alpha at the intriguing 'Bubble' nebula, NGC 7635. This image is a stack of eleven eight-minute subframes.
Peter
Equipment:
Atik 460EX CCD, Ha filter, 14inch f/10 LX200 SCT, EQ8 mount autoguided with a Lodestar Mk2 off-axis guider.
also known as NGC 4736, Crocodile Eye Galaxy, or Croc's Eye Galaxy.
Dwarf 3
80 45-second subframes (one hour total exposure)
Manufacturer: Carl F. W. Borgward G. m. b. H. Automobil- und Motoren-Werke, Bremen-Hastedt -Germany / Carl F. W. Borgward G.m.b.H., Bremen-Sebaldsbrück - Germany
Type: BO 611 Omnibus
Production time: 1959 - 1961
Production outlet: 14,748 (all B 611 Series)
Engine: 1493cc straight-4
Power: 60 bhp / 4.700 rpm
Torque: 108 bhp / 2.400 rpm
Drivetrain: rear wheels
Speed: 92 km/h
Curb weight: 1740 kg
Wheelbase: 102 inch
Chassis: steel ladder-frame + additional subframe with all-steel body
Steering: ZF-Gemmer worm & sector
Gearbox: four-speed manual / fully synchronized / steering wheel shifter
Clutch: hydraulic F&S single dry plate disc
Carburettor: Solex 32 PJCB
Fuel tank: 50 liter
Electric system: Bosch 6 Volts / Diesel 12 Volts
Ignition system: distributor and coil
Brakes front: hydraulic Duplex inside expanding drums
Brakes rear: hydraulic Simplex inside expanding drums
Suspension front: independent two unequal length laterally mounted wishbones, sliding struts with coil springs and sway bar + telescopic shock absorbers
Suspension rear: transverse reinforcement bars with sliding struts, longitudinally mounted semi-elliptic leaf springs + telescopic shock absorbers
Rear axle: rigid "swing" Banjo type
Differential: spiral bevel
Wheels: 4 1/2 K x15
Tires: 6,70 x 15
Special:
- This light commercial vehicle was launched in 1957 as Borgward B 1500 F (F="Frontlenker-Transporter" / "Cabover Transporter") and renamed in 1959 as B 611.
- The engine was installed in a large pod between the driver and his passenger.
- The Omnibus has a 17 passengers capacity and with a relatively narrow turning circle of 10.8 meters it was particularly suitable for city use.
- The B 611 Series was available as this BO 611 Omnibus, as B 611 Van, as B 611 Pick-Up Truck and as rolling chassis cab.
- It also could be bought as D/B(O) 611 with a 1758cc straight-4 Bosch PES 4 A 50 B 410 RS 80/1 Diesel engine - 42 bhp / 3.400 rpm - 102 Nm / 2.200 rpm - 75 km/h.
- According to the owner this bus is in totally original (unrestored) condition and there are only 4 Omnibus survivors left.