NGC 5792 is a barred spiral galaxy,
visually located in the constellation Libra. It presents to us at a fairly sharp angle from face-on, so it apperas very elliptical. It is thought to be about 83 million light years away from us, which
would give it a diameter of almonst 200,000 light years, making it a very large galaxy (our Milky Way galaxy, itself a large galaxy, now is thought to be a bit over 100,000 light years across).
Being so far away, it is only about 8 arcminutes across in our sky. The entire field of the uncropped versions is about the angular size of a full moon. Technical Information: Ha:L:R:G:B: 360:570:180:180:240 (a total of over 25 hours of light-frame exposure time); there are thirty-four 150-minute exposures and 20 3-minute exposures through the
luminance filter; red and green exposures were all 15-minute exposures; blue were all 20-minute exposures, while Ha were all 20-minute exosures. The luminance layer consisted of an HDR blend
of the 15-minute and 3-minute exposures, with the Ha data blended in; the red channel is a combination of twelve 15-minute images thorugh a red filter and the Ha data. The green channel is
a combination of twelve 15-minute images through the green filter. The blue channel is a combination of twelve 20-minute images through a blue filter. Equipment: RC Optical Systems 14.5 inch Ritchey-Chretien carbon fiber truss telescope, with ion-milled optics and RCOS field flattener, at about f/9, and an SBIG STX-16803 camera with
internal filter wheel (SBIG filter set), guided by an SBIG AO-X, all riding on a Bisque Paramount ME German Equatorial Mount. Image Acquisition/Camera Control: Maxim DL, controlled with ACP Expert/Scheduler, working in concert with TheSky X. Processing: All images calibrated (darks, bias and sky flats), aligned, combined and cropped in Pixinsight. Color combine in Pixinsight. Some finish work (background neutralization,
color calibration, NB blend, NoiseXTerminator and BlurXTerminator) done in Pixinsight; some cleanup finish work was done in Photoshop 2024. Location: Data acquired remotely from Sierra Remote Observatories, Auberry, California, USA. Date: Images taken on many nights in June of 2024. Image posted January 18, 2025. Date: Image scale of full-resolution image: 0.56 arcseconds per pixel. Seeing: Generally good. CCD Chip temperature: -25C Copyright 2024, 2025
Mark de Regt
The bright yellow star at the edge of the galaxy is a star in our galaxy, in the line of sight with NGC 5792. It is not a super-bright thing in that galaxy.
This image is a heavily-cropped piece of the entire field I photographed; if you click through where indicated, there are three different resolution versions of the entire (uncropped) version.
As is often the case with large-field deep-sky photographs, there are a lot of tiny (meaning, of course, very far away) galaxies in the background of this photo.