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NGC 3938 is the main object in this field. It is a classic face-on spiral - SA(s)c. It's distance is somewhat vague for such a prominent galaxy. Early Tully-Fisher (redshift independent) measurements places it 18-19 million light years distant; a later Tully-Fisher place it at about 55 million light years; more current estimates (SNII optical) place it at about 71 million light years. Redshift distance measurement places it at about 48 million light years. I showed the 71 mly redshift independent estimate and the 48 mly redshift estimate in my annotation.
Also captured in this image the galaxy NGC 4013 - classified "Sb edge-on". Its distance estimate (by Tully-Fisher and redshift) are more consistent and range from about 49 to 58 million light years. Arp 62 (APG 62) is also seen. It is a distorted galaxy pair with an estimated distance of about 240 to 280 million light years. A better image scale would do a better job on this object. There are a number of background galaxies and Quasars (I annotated the brighter ones). The full size image shows these best. The furthest Quasar that is still reasonably visible in the image has a redshift of 2.205.
Image and details can be accessed at the link below (or by clicking on the NGC 3938 thumbnail image); full size image can be accessed from the image webpage and has an image scale of 1.76 arcsec/pixel. The annotated image link is provided below, but that can also be accessed from the image webpage.
Scope: Explore Scientific MN152 at f/4.8
Camera: ST8300M (Baader LRGB filters)
Location: DAA Observatory, Shelter Valley, CA
Jim Thommes Jim's Astrophotography
David Levy Maksutov Newtonian, Celestron Edge 9.25, FSQ-106N Refractor (on loan), WO ZenithStar 66 APO Refractor, WO Megrez II APO, Sigma 150 mm EOS Lens
Losmandy G11/Gemini, iOptron GEM45, Celestron Advanced VX, iOptron CEM70
ST8300M Camera, Atik 383L, Canon 350D (IR cut modified), ASI1600M, ASI294M, ASI260M
Observatory - Desert Astronomy Association (Shelter Valley, CA)
Thanks for another beauty Jim. I'm definitely more of an astrophotographer than an astronomer. Your astronomy information is always interesting and appreciated.
Your images always make me feel like I'm looking out the window of a spaceship located close to the target being viewed. Really nice work.
Steve
Steve King: Light Pollution (Bortle 5)
Telescope + Mount + Guiding: W.O. Star71-ii + iOptron CEM40 EC + Orion Magnificent Mini AutoGuider
Camera: ASI 1600MM Pro + EFW Filter Wheel + Chroma 3nm Siii, Ha, Oiii + ZWO LRGB Filters
Software: PHD2; APT; PixInsight ***** My AP website: www.steveking.pictures
Outstanding job with an appreciated annotated version too!
Thank you
Jim
Scopes: Explore Scientific ED102 APO, Sharpstar 61 EDPH II APO, Samyang 135 F2 (still on the Nikon).
Mount: Skywatcher HEQ5 Pro with Rowan Belt Mod
Stuff: ASI EAF Focus Motor (x2), ZWO OAG, ZWO 30 mm Guide Scope, ASI 220mm min, ASI 120mm mini, Stellarview 0.8 FR/FF, Sharpstar 0.8 FR/FF, Mele Overloock 3C.
Camera/Filters/Software: ASI 533 mc pro, ASI 120mm mini, ASI 220mm mini , IDAS LPS D-1, Optolong L-Enhance, ZWO UV/IR Cut, N.I.N.A., Green Swamp Server, PHD2, Adobe Photoshop CC, Pixinsight.
Dog and best bud: Jack
Sky: Bortle 6-7
My Astrobin: https://www.astrobin.com/users/Juno16/
Thanks for the comments folks. It took awhile to respond back - I had been out at the observatory and just now getting back.
STEVE333 wrote: ↑Wed Jul 15, 2020 12:46 am
Thanks for another beauty Jim. I'm definitely more of an astrophotographer than an astronomer. Your astronomy information is always interesting and appreciated.
Your images always make me feel like I'm looking out the window of a spaceship located close to the target being viewed. Really nice work.
Steve
Thanks Steve. Yeah, I have focused a bit on the Astronomy part of this hobby - its really fascinating to me. The Astrophotograhy is really fun too, but it is a bit of a means to get to the Astronomy part. Problem is, I am really just a rank amateur at the astronomy stuff. I guess like anything else, the more you learn about something, the more you realize what you really don't know.
Outstanding job with an appreciated annotated version too!
Thank you
BABOafrica wrote: ↑Wed Jul 15, 2020 1:05 pm
The full frame version is wonderful and I love the annotations.
BABO
BABO, Greenman,
Thanks both for the comments on the annotation. They are what I really like to work on when I process data into an image.
Jim Thommes Jim's Astrophotography
David Levy Maksutov Newtonian, Celestron Edge 9.25, FSQ-106N Refractor (on loan), WO ZenithStar 66 APO Refractor, WO Megrez II APO, Sigma 150 mm EOS Lens
Losmandy G11/Gemini, iOptron GEM45, Celestron Advanced VX, iOptron CEM70
ST8300M Camera, Atik 383L, Canon 350D (IR cut modified), ASI1600M, ASI294M, ASI260M
Observatory - Desert Astronomy Association (Shelter Valley, CA)
-Michael Refractors: ES AR152 f/6.5 Achromat on Twilight II, Celestron 102mm XLT f/9.8 on Celestron Heavy Duty Alt Az mount, KOWA 90mm spotting scope Binoculars: Celestron SkyMaster 15x70, Bushnell 10x50 Eyepieces: Various, GSO Superview, 9mm Plossl, Celestron 25mm Plossl Camera: ZWO ASI 120 Naked Eye: Two Eyeballs Latitude: 48.7229° N
As always Jim, a superb image!! Thanks for all the information concerning it... I always learn something from your informative posts!! Glad you’re back in the observatory so we can all benefit from your fine work!!
Great Image!!
Tom
Michael, BigKahuna, Tom, Dan, Joe,
Thanks for the comments. They are much appreciated.
Jim Thommes Jim's Astrophotography
David Levy Maksutov Newtonian, Celestron Edge 9.25, FSQ-106N Refractor (on loan), WO ZenithStar 66 APO Refractor, WO Megrez II APO, Sigma 150 mm EOS Lens
Losmandy G11/Gemini, iOptron GEM45, Celestron Advanced VX, iOptron CEM70
ST8300M Camera, Atik 383L, Canon 350D (IR cut modified), ASI1600M, ASI294M, ASI260M
Observatory - Desert Astronomy Association (Shelter Valley, CA)