NGC 5485 is an elliptical galaxy in Ursa Major that lies in the corner of the constellation near the border with Boötes.  This group of galaxies is not far from M101, so they likely appear as background objects in the many M101 images on Astrobin.  However, they are worth a closer look for their own merits.

Close inspection of NGC 5485 reveals a razor-thin dust lane crossing its core.  I was surprised it even showed up in a 100 mm refractor image, but 25+ hours of integration will work wonders for a lot of galaxies.  According to TheSkyX databases, NGC 5485 is magnitude 11.3 overall and spans 2.3’ x 1.9’.  This galaxy is four times more distant than M101, and is therefore not part of the M101 group, according to Rick Johnson’s write-up.[1]  The thin sliver of light on the edge of NGC 5485 may be a background galaxy shining through it.

To the lower left, the galaxy with blue highlights is NGC 5486, shining at magnitude 13.3 and measuring 1.5’ x 0.9’.  While it is a small target for the little refractor, it gave up quite a bit of detail, including a few tiny H-alpha emissions.

To the upper left of NGC 5485 is a faint spiral of magnitude 14.7 and angular size 0.8’ x 0.7’, NGC 5484.  It almost looks star-like in this image.  I am surprised this galaxy received an NGC designation, as it is smaller in size and comparable magnitude to several of the PGC objects in this field of view that were not included in the New General Catalogue.

To the upper right of NGC 5454 is the spiral galaxy PGC 3484941 of type SBm.  While it appears larger than NGC 5484, its visual magnitude is just 16.5.  Continuing in the upper left direction, the type SA0/a spiral PGC 2487633 appears to be nearly edge-on and shines at magnitude 15.8.

Several other PGC galaxies appear in this image.  On the left side of the image is PGC 2494825 at magnitude 16.1 and its tiny companion PGC 2494871 at magnitude 17.6.  In the right-center part of the field, the galaxies PGC 2480744 (mag. 16.5, elongated or edge-on) and PGC 50395 (mag. 14.9) actually lie in the constellation Boötes.  The largest galaxy in the lower right corner by angular size is PGC 50546 (UGC 9051), an irregular galaxy of 17th magnitude.  In the lower right corner is LEDA 2483087. 

References

1) Rick Johnson, “NGC5485.”  Mantrap Skies Catalog.  https://images.mantrapskies.com/catalog/NGC/NGC0974-NGC0969-NGC0970-NGC0971-NGC0978/index.htm
2) University of Strasbourg, SIMBAD database.  https://simbad.u-strasbg.fr/simbad/sim-fid
3) Software Bisque, TheSkyX databases.