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Found 134 results

  1. M42 and M43: my first target using the new Orion SteadPix EZ. Once all set up, Orion's SteadyPix EZ works really well (though it can be tough swapping lenses on a dark night). This pic is actually just one shot made into three layers: 1 layer for is the entire picture, one layer with the main body of M42 cut out, and one layer consisting only of M43. I stacked and processed them on the iPhone with the Photoshop Mix application. I found that playing with the stacking transition settings (Blend) yielded the best results when using the following options: Normal, Brighten or Punch. Cutting away portions of the various layers allowed me to expose just the portion I wanted, so the dimmer nebulousness came through without destroying the rest of the photo. For me iPhone afocal AP is the way to go... until I can trick my wife into allowing me to buy a an EQ mount, guide scope, imaging OTA, CCD sensors, etc... 13 January 2018 Memphis, Tennessee, USA Sky Watcher 10" Dob iPhone 8 Plus Sky: NELM 4.5-5 Bortle Class 7-8 Edit: Used a cheap bluetooth shutter remote to actually take the photo
  2. My first try at astrophotography, the orion. Taken with canon eos 1300D on a static tripod. Details- Lights - 9 x 7secs Iso - 6400 Lens - 18- 55mm kit Lens at 55mm Stacked em in DSS and did little tweeks in Rawtherapee, i'll try to learn photoshop to improve the results Looking forward to some suggestions
  3. Taken tonight via my SkyScanner 100 scope with a 6mm Expanse eyepiece. Night mode turned on my Samsung smartphone and images taken with it through the scope.
  4. Hello all, I'm starting a new thread for this since the hydrogen data is rather old and it has been reprocessed since I posted a while ago. Now I finished the acquisition of O[III] too. Or sort of, I planned more, but clear nights were so rare that I decided to process what I had. The image was done in "3 pass" data over the area. That means that I acquired 3 sets of images covering the same area and combined in the end. First 2 in hydrogen, the last in oxygen. First set consisted of 3 panels in portrait mode for the top area and then I wanted to extend them to the bottom so I shot another 2 panels in landscape mode. I knew that I could get a higher SNR so I shot 4 more panels in landscape mode. Each panel consists of 30-31 subs, each sub 300s. Then I started the acquisition of O[III] which needed light pollution and moonlight conditions than the Ha required. Top panels contain 30 subs, but the bottom ones, only 20-22. Each 300s. Luckily there's not much oxygen in that area so I could get away with less subs. I also took some 10s-30s frames for M42's core. For the framing, I created a quick mosaic of the same area. For the final alignment I shot an image somewhere close to the center of this area. I can't remember if the initial register was done in APP or Registar - for the first pass, but for the next ones it was done in Registar. I removed the gradient manually in each stack with APP and then I created the mosaics for each pass same with APP. The 2 Ha passes I then blended manually 50%-50%. For the processing, I tried to stretch both Ha and O[III] to the same levels and I combined them manually in some 60-40/70-30 ratio for a layer which I used as lum. The colours were Ha - reddish, O[III] - cyan-blue. I spent a lot of time trying to control the big stars, the O[III] filter has poor coatings and, together with the ASI1600s non AR coated sensor, I had much brighter reflections than with the Ha filter. And I tried to raise the oxygen levels selectively around the flame and NGC2023, but the flame is really dim in O[III]. Don't know what other details in the story I forgot, this project drained me a lot of energy. Camera was ASI1600MMC, cooled to -15C for the first pass and to -25C for the ones following. Gain 139. Canon 300 F4 L IS lens with a lot of aberrations towards the edges. AZ-EQ5 mount guided with a 200mm lens and an ASI120MM, with varying seeing. 1.5-2.5" RMS guiding error usually. APT for capture, PHD2 for guiding, Registar for each night initial alignment. DSS, APP, Registar, StarTools, GIMP for processing. I started shooting early in October and I wanted much more, but Orion already becomes less and less visible from where I image and hides beyond the house. Ah, yes, I image from a yellow-pink light polluted area. Thanks for reading, thanks for looking! Comments and suggestions are appreciated. Links to original image and acquisition details: https://drive.google.com/open?id=17tr8lqagQAJg8maojtHZPbM-f67gSBTv https://drive.google.com/open?id=12gjGEgeR7FxR1Tow0e64JczeeUIqKojK https://www.astrobin.com/330284/ Alex
  5. “The Blue Bunny Nebula” .......... Edit: 27 Jan 2018 - updated again to try to draw more faint nebulosity out of the background; ( NGC 2359 - Thor’s Helmet ) ( please click / tap on image to see larger and without compression artefacts ( and double click on that image if you what to see it as I posted it ! ) ) ......... Edit: 24 Jan 2018 - stars a little brighter and tighter with no change to the rest of the image ( NGC 2359 - Thor’s Helmet ) ( please click / tap on image to see larger and without compression artefacts ( and double click on that image if you what to see it as I posted it ! ) ) ................. original: Thor's Helmet ( NGC 2359 ) in the constellation Canis Major Thor’s Helmet ( Duck Nebula, NGC 2359 ) ( please click / tap on image to see larger ) This HDR image shows the bright nebula Thor’s Helmet in a sea of colourful stars against a background of red from dust and HA emissions. The stars in this image range from the brightest ( bottom right, HD 56501 ) at magnitude +7.7 to around +20 or more. HDR capture and processing allows all of the stars to be portrayed in colour without any burnt-out highlights. The colours of the stars and nebula are as close as I can get them to their "true colours" by using a "daylight colour balance" and allowing for the extinction of blue-green due to atmospheric absorption/scattering ( mean altitude during capture ~ 60deg ). The blue star in the centre of the bubble of expanding stellar material is HD 56925 ( WR7 ) - a massive, unstable and short-lived Wolf-Rayet star that one day will detonate in a supernova. Image details: NGC 2359 Thor’s Helmet / Duck Nebula: Magnitude +11.5, RA (2000.0) 7h 15m 37s, Dec -13deg 12' 8", approx. 1800 light years away HD 56925 / Wolf-Rayet 7 ( WR7 ) ( blue 11.5 mag star at centre of “bubble” ) Haffner 6 ( open ster cluster centre left of image ) Plate Solution: Resolution ........ 1.318 arcsec/px Rotation .......... 0.00 deg ( North is up ) Focal ............. 1398.41 mm Field of view ..... 57' 40.8" x 38' 29.0" Image center ...... RA: 07 18 36.509 Dec: -13 11 53.38 Telescope: Orion Optics CT12 Newtonian ( mirror 300mm, fl 1200mm, f4 ). Corrector: ASA 2" Coma Corrector Quattro 1.175x. Effective Focal Length / Aperture : 1410mm 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 ( 18 & 19 Jan 2018 ) 9 sets of sub-images with exposure duration for each set doubling ( 1s to 240s ) all at ISO 250. 116 x 240s + 5 each @ 1s to 120s Processing ( Pixinsight - 20 Jan 18 ) Calibration: master bias, master dark and master flat Integration in 9 sets HDR combination arcSinH stretch
  6. It was freezing cold last night; far too cold for an extended observing session. However, with Orion in the perfect position over the dells, I decided to try a little AP. Canon EOS 1300D (unmodified) 18-55mm kit lens F3.5 30 seconds ISO 160
  7. Another Orion from me, Hiding behind the trees waiting to attack ! HTC10 ISO 800 8 seconds propped against car wing mirror.
  8. M42 in HOO

    Here's my first attempt at bi-colour HOO narrowband, using the OIII filter I got for Christmas Please do click through to Flickr and have a look at it with the magnifying glass, there's loads of detail in there. 23x600s Ha, 20x60s Ha, 10x600s OIII, 8x60s OIII, darks, flats and bias, equipment as per sig, Pixinsight. It was an absolute joy to process this, it was singing to me from the very first trial combination of stacks. I had lots of fun playing with colour balances (actually it's more like HOo, and then I let the red grow a bit, looks like a watermelon to me). Had fun with the HDR too. I've done some HaLRGB before, and I have the skies for it, but I'm finding HaLRGB to be quite frustrating - takes ages to process to get the balance right, and even then it seems to be a compromise between the detail of the Ha and the colours of the RGB, and all too often, it comes out like a big red smudge. I've got a Pacman in processing that might just end up left on the cutting room floor. It seems I've finally tamed my collimation and coma demons, but on this occasion, my guiding was surprisingly shocking. I normally get something like 0.45" rms error, but this time was as much as 2.5". We'd had near-gales the few days before I took this, and while it was calm at ground level on the nights I was capturing, I guess it was still hurtling around in the upper atmosphere - pretty twinkling stars, and a rather less pretty guide star bouncing around all over the place in PHD. I had to throw away nearly half of my OIII because the stars were too fat, as you can tell from the capture details above. Just for a laugh, here is my first attempt, taken 6 years ago with an unmodded DSLR - a shamefully small set of data (ahem, 13x10s !) and processed within an inch of its life (I think this was about the 4th reprocess), but not a bad attempt I suppose. Anyway, hope you enjoy, comments and cc welcome ! Cheers, Stuart
  9. For sale Orion autoguider package in excelent condition £200 delivered. Included in box:- Orion StarShoot autoguider Orion 50mm Guide Scope USB2 cable RJ11 cable Software disc
  10. The Fighting Dragons of Ara ( NGC 6188 ) ( please click / tap on image to see larger ) The Fighting Dragons of Ara ( NGC 6188 ) Bright Nebula NGC 6188 and open cluster NGC 6193 are embedded 4,300 light years away in the Sagittarius arm of our Milky Way galaxy and can be seen with the naked eye south of Scorpius in the constellation of Ara. With powerful stellar winds and energetic ultra-violet radiation, massive stars sculpt the interstellar gas and dust of the nebula into wonderful shapes and cause the interstellar gas to brightly fluoresce. Closer to the hot young stars of the cluster, bright blue “sunlight” reflects off the clouds of gas and dust to produce the blue reflection nebulae seenin the image. Magnitude +5.19, RA 16h 41m 42s, Dec -48deg 48' 46". Approx. 3800 light years away. Image details: This is an HDR image constructed from exposures ranging from 2 seconds to 240 seconds in length. The aim was to capture the faint stars and details in the nebula whilst at the same time maintaining colour in the bright stars without clipping the highlights. Plate Solution: Resolution ........ 1.336 arcsec/px Rotation .......... 90.002 deg ( North is to the right ) Focal ............. 1475.57 mm Pixel size ........ 9.56 um Field of view ..... 58' 28.5" x 39' 0.8" Image center ...... RA: 16 40 09.903 Dec: -48 41 27.00 Telescope: Orion Optics CT12 Newtonian ( mirror 300mm, fl 1200mm, f4 ). Corrector: ASA 2" Coma Corrector Quattro 1.175x. Effective Focal Length / Aperture : 1410mm f4.7. Mount: Skywatcher AZ Eq6 GT. 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 ( 24 June 2017 ). 8 sets of sub-images with exposure duration for each set doubling ( 2s to 240s ) all at ISO800. 34 x 240s + 10 each @ 2s to 120s. Processing ( Pixinsight - 19 Aug 2017, 13 Jan 2018 ). Calibration: master bias, master flat and no darks. Integration in 8 sets. HDR combination. ......... This is a reprocessed version using the data I captured earlier in the year...
  11. M42

    Hi. Submitting my M42 for the challenge, suffice to say that no narrow band was captured or harmed in the creation of this image. Instead I wrung the LRBG to death! http://www.pbase.com/grahammeyer/image/166759195/original.jpg Telescope: William Optics FLT132 Guide Scope: FLT132 & QHY OAG Camera: QHY9 Mono @ -20c Filter Wheel: QHY Filters: QHY 36mm unmounted L R G B HA OIII SII Guide Camera: QHY5LII Mount: AZ-EQ6 Mount Control: EQASCOM Focusing: SharpSky Pro and Focusmax Capture Software: MaxIm DL 5 Calibration and Stacking Software: PixInsight Processing Software: PixInsight(calibration, stacking, integration, etc) and Photoshop(layer masking) L= 33X300sec, 10x120sec , R= 16x240sec, 10x120sec, 10x30sec , G= 20x240sec, 10x120sec, 10x30sec , B= 20x240sec, 10x120sec, 10x30sec Ha= x , SII= x , OIII= x . Binning: 1x1 Total Image Time: 484min (8.06hrs) Captured: 10.12.2017 - 23.12.2017 Light Box by Exfso
  12. I have been using a 1 1/4 inch UHC filter but this had been causing bad vignetting that was difficult to remove during processing. So, I left out the filter so there was a 'straight 2"' opening into the camera. However, the light pollution meant that 45 s was the maximum exposure. Anyway, I took 65 x 45s of Orion and 165 x 45 s of the Crab - one looks good (for me ) and one looks bad, even for me ! I tried the processing several times but this was the best I could do. So, the advice I am after is, is the poor image of the crab due to the nature of the nebula? my camera is unmodded.
  13. Taken @ 2200 6th Jan 2018 with an HTC10 carefully propped on patio table using 5 second delay to stop vibration. 8 seconds single sub at 400 ISO. Tried longer but showed trailing. RAW capture, adjusted contrast and exposure then cropped to centre image using Photoshop express mobile . The banding near the bottom is clouds ! They get everywhere...
  14. Hi i thought I’d found the Great Orion Nebula tonight but have now looked at other images and it seems I was looking at Orion Trapezium how have I missed Great Orion Nebula
  15. Hi All, This is an image of the Trapezium in Orion taken with my CPC 1100 and Canon 700D. 21 x 15 second exposures at ISO 400 were stacked and auto-stretched in Siril. Curve was tweaked, image was sharpened and cropped in Gimp. It was taken at the native f10 without a focal reducer. The stars are somewhat oval - the reason for which I have not figured out. I think the G and H stars can be made out. Hope you like and any comments are welcome!
  16. Wow, I've just seen the Orion nebula for the first time (only being star gazing since April so haven't had chance until now), and it is one of the most amazing sites I've seen in the sky. Also seen some doubles and Hagrids dragon, overall a good nights gazing. Infact, the best nights gazing in a good while. Hope everyone else is enjoying the clear sky's
  17. The Rosette Nebula and Cluster ( NGC 2237 and 2244 ) in the constellation Monoceros edit: updated 30th Dec with improved colour balance and slightly increased brightness ... ...... original: ( please click / tap on image to see larger and sharper ) Still a work-in-progress really... with only 10 x 4min exposures for the main 'lights' before the clouds came over. I will try to add some more data when the moon has gone I am still experimenting with how to get the best out of the D7500. With the very warm nights ( low to mid 20s all night ) the 'warm pixels' are very noticeable so I reverted to my old practice of in-camera dark subtraction. This worked quite well and produced a nice smooth noise floor in the integrated images - albeit at the expense of more exposures. ................. Identification: The Rosette Nebula ( NGC 2237 ) is a large, circular emission nebula in the constellation Monoceros. It surrounds a cluster of hot, young stars known as the Rosette Cluster ( NGC 2244 ). ( SkySafari ) NGC 2237, 2244 Caldwell 49, 50 North is up. .................. Capture Details: Telescope: Orion Optics CT12 Newtonian ( mirror 300mm, fl 1200mm, f4 ). Corrector: ASA 2" Coma Corrector Quattro 1.175x. Effective Focal Length / Aperture : 1400mm f4.7 Mount: Skywatcher EQ8 Guiding: TSOAG9 Off-Axis-Guider, Starlight Xpress Lodestar X2, PHD2 Camera: Nikon D7500 (unmodified) (sensor 23.5 x 15.7mm, 5568x3712 @ 4.196um pixels) Location: Blue Mountains, Australia Moderate light pollution ( pale green zone on darksitefinder.com map ) Capture ( 23 Dec 2017 ) 9 sets of sub-images with exposure duration for each set doubling ( 1s to 240s ) all at ISO400. 10 x 240s + 5 each @ 1s to 120s imaged ~ +/- 1.5hrs either side of meridian maximum altitude ~ 51.3 deg above north horizon Processing ( Pixinsight ) Calibration: master bias, master flat and in-camera dark subtraction Integration in 9 sets HDR combination Image Plate Solution =================================== Resolution ........ 0.633 arcsec/px ( full size image ) Rotation .......... 0.181 deg Focal ............. 1367.90 mm Pixel size ........ 4.20 um Field of view ..... 58' 59.4" x 39' 15.0" Image center ...... RA: 06 31 55.638 Dec: +04 56 30.84 ===================================
  18. I'm putting together a beginner setup for AP and had decided on the Sirius EQ-G (HEQ5). I see that Orion makes a hybrid version, the Sirius Pro Az/EQ-G. I know the Sirius EQ-G is a good beginner mount, as I see it referenced everywhere as a good place to start for just about anyone beginning in AP, but is the hybrid mount equally stable? Does anyone have the Pro Az/EQ-G who can comment on stability for AP? I'd really like to have the Alt/Az functionality for quicker visual setup, but if it will interfere with stability for AP, I'd have to consider buying a separate setup for visual use. Thanks in advance for any input.
  19. I have a dob mount already for a 12 inch. The OTAs I am considering are Skywatcher 300P-DS and Orion VX12L (standard optics), 1500 & 1600mm fl respectively. Orion is near twice the price of SW! So what makes the huge difference in price? I could understand better if the standard Orion optics were 1/10 wave (as for their CX range), each uses their own make of focuser, Orion can have a fan. So what is there apart from brand name?
  20. Another widefield I took on 25th/26th Nov using my Baader modded 350d and Canon 85mm EF f1.8 USM (working at f4.5). This is 21x5min, so 1h45m total taken at ISO400 using an IDAS P2 filter from here in Oxfordshire. I'm sure the region doesn't need too much introduction. To be honest, it needs a lot more exposure, and arguably taking with something more sensitive with less read noise! Being a bit further south would help me too...there was a heavy dose of DBE to sort the gradients out here. Barnard's Loop, the Bogeyman, M42/3, Flame and Horsehead all relatively easy, and the dusty stuff (part of The Orion Molecular Cloud Complex) that extends between them passing by M78 is reasonably obvious, though the fainter stuff is all a bit noisy still. There's also the bluish nebulosity LBN 915 *just* on the limit of visibility to the right of Sh2-278 that extends around the right of eta Orionis. As I said though, it all needs much greater SNR, and less need to resort to MMT for noise reduction... (any more and it started to adversely affect the image). Both images reduced to 2048px width here for convenience. Thanks for looking.
  21. The Great Barred Spiral Galaxy ( NGC 1365 ) in the constellation Fornax edit: new version with new long exposure data ( 52 x 240sec ) and better dark subtraction / dithering to remove streaks in the noise and amp glow. This also allowed for a greater stretch revealing more faint data in the galaxy and small faint fuzzies in the image .. The Great Barred Spiral Galaxy ( NGC 1365 ) in Fornax ( please click / tap to see larger ) and below I have added a 100% crop of new version: ........ original image: NGC 1365 ( please click / tap on image to see larger ) ............... The Great Barred Spiral Galaxy ( NGC 1365 ) in the Constellation Fornax Below the equator, not seen from much of the Northern hemisphere, NGC 1365 passes very nearly directly overhead an observer situated near Cape Town, as Sir John Herschel was in November of 1837, or near Sydney, as I was, almost exactly 180 years later, when I photographed this “remarkable nebula” that is numbered 2552 in his book of observations from the Cape. Not called a “nebula” now, of course, this striking object is one of the nearest and most studied examples of a barred spiral ( SB ) galaxy that also has an active galactic nuclei resulting in its designation as a Seyfert galaxy. At around 60 M light years from Earth, NGC 1365 is still seen to occupy a relatively large area ( 12 by 6 arc minutes ) due to its great size; at some 200,000 light years or so across, NGC 1365 is nearly twice as wide as the Milky Way and considerably wider than both the Sculptor and Andromeda galaxies. This High Dynamic Range ( HDR ) image is built up from multiple exposures ranging from 4 to 120 seconds with the aim of capturing the faint detail in the spiral arms of the galaxy whilst also retaining colour in the brightest star ( the orange-red 7th magnitude giant, HD 22425 ). Also, scattered throughout the image, and somewhat more difficult to see, are numerous and far more distant galaxies with apparent magnitudes of 16 to 18 or greater. Mike O'Day ................. Identification: The Great Barred Spiral Galaxy New General Catalogue - NGC 1365 General Catalogue - GC 731 John Herschel ( Cape of Good Hope ) # 2552 - Nov 28, 29 1837 Principal Galaxy Catlogue - PCG 13179 ESO 358-17 IRAS 03317-3618 RA (2000.0) 3h 33m 37.2 s DEC (2000.0) -36 deg 8' 36.5" 10th magnitude Seyfert-type galaxy in the Fornaux cluster of galaxies 200 Kly diameter 60 Mly distance .................. Capture Details: Telescope: Orion Optics CT12 Newtonian ( mirror 300mm, fl 1200mm, f4 ). Corrector: ASA 2" Coma Corrector Quattro 1.175x. Effective Focal Length / Aperture : 1400mm f4.7 Mount: Skywatcher EQ Guiding: TSOAG9 Off-Axis-Guider, Starlight Xpress Lodestar X2, PHD2 Camera: Nikon D7500 (unmodified) (sensor 23.5 x 15.7mm, 5568x3712 @ 4.196um pixels) Location: Blue Mountains, Australia Moderate light pollution ( pale green zone on darksitefinder.com map ) Capture ( 22 Nov 2017 ) 6 sets of sub-images with exposure duration for each set doubling ( 4s to 120s ) all at ISO400. 70 x 120s + 5 each @ 4s to 60s total around 2.5hrs Processing ( Pixinsight ) Calibration: master bias, master flat and no darks Integration in 6 sets HDR combination Image - Plate Solution ========================================== Resolution ........ 1.328 arcsec/px Rotation .......... -0.008 deg ( North is up ) Field of view ..... 58' 8.6" x 38' 47.5" Image center ...... RA: 03 33 41.182 Dec: -36 07 46.71 ==========================================
  22. M42.jpg

    From the album David Newbury

    Orion Nebula M42 ATIK 4120EX OSC C11 with Hyperstar Mesu 200 mount 80 lights consisting of 0.1s upto 180s Processed in Pixinsight.
  23. Taken Saturday night, 25/26 Nov 17. 80 subs of 0.1.s, 1s, 10s x 20 each. 60s and 180s x 10 each. Flats/bias/darks x 10 each. Atik 4120EX OSC camera Celestron C11 with Hyperstar Mesu 200 mount.
  24. The Horsehead Nebula (B33) The Horsehead Nebula (Barnard 33) is one of the best known nebulae in the night sky but few astronomers have actually observed it through a telescope. The reason for this strange state of affairs is that the nebula is very dim as it is, in essence, just a pillar of dark dust and gas – in fact we can only see it because of the curtain of relatively bright Hydrogen Alpha (Ha) emissions (IC 434) behind it. This weekend several observers have seen it for the first time through a combination of excellent conditions - especially last night (25th/26th November) - and pure dogged determination to observe it. My hat is off to these intrepid observers who have persevered to achieve that goal. I on the other hand turned to the ‘Dark Side’ to achieve the same goal capturing my data over 2 nights, the first killed part way through by mist and cloud and the second (last night) working very well until a miscalculation in my image scheduling meant that the observatory closed down when it failed to maintain its guide star while imaging through a tree – Doh! Barnard 33 is a dark nebula situated in the Orion Molecular Cloud Complex in the constellation of Orion. Situated underneath the mag +1.74 ‘Belt Star’, Alnitak, this nebula is very well named as in images, its shape representing a horse’s head is clearly identifiable. For me it actually looks closer to a sea horse in appearance but the shape of a horse it most certainly is! Image Stats Mount: Mesu 200 Telescope: Sky-Watcher Esprit 150 Flattener: Sky-Watcher Esprit specific Camera: QSI 683 WSG-8 Filter: Astrodon 3nm Ha Subframes: 15 x 1800 sec Ha Integration: 7.5 hours Control: CCD Commander Capture: MaxIM DL Calibration and Stacking: PixInsight Post-Processing: PhotoShop PS3 I have deliberately taken a 'high key' approach to processing this data to release some of the additional detail often lost in the foreground region below the Horsehead Nebula itself. The Horsehead Nebula - B33
  25. Spiral Galaxy NGC 6744 in Pavo NGC 6744 is a Milky Way like barred spiral galaxy in the constellation Pavo. Visible only from lower latitudes, the light we see now left this galaxy around 25 million years ago. NGC 6744 in Pavo ( please click / tap on image to see larger and sharper ) Capture Details: 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 : 1400mm 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 ( 16, 17, 19 Sept. 2017 ). 9 sets of sub-images with exposure duration for each set doubling ( 1s to 240s ) all at ISO800. 85 x 240s + 5 each @ 1s to 120s. Processing ( Pixinsight - 5-17 Nov 2017 ). Calibration: master bias, master flat and no darks. Integration in 9 sets. HDR combination PhotometricColorCalibration Arcsinh stretch ( function written by Mark Shelley ) Image Plate Solver - NGC 6744 - Sept 17, 2017 =================================== Resolution ........ 0.586 arcsec/px ( full size image ) Rotation ............ 0.001 deg. Focal ................. 1372.24 mm. Pixel size ........ ..3.90 um. Field of view ..... 58' 30.3" x 38' 59.0". Image center ...... RA: 19 09 46.591 Dec: -63 51 13.44 ==================================
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