Hi Gary
I wonder if your request may have led to the "discovery" of a previously "mis-identified" DSO that looks like a faint Galaxy?
On the original images I took on 6th June 2021, I noticed a fuzzy object in the field that did not look like the other field stars. So I went out last night and took another set of images and the "fuzzy" object is still there.
On these images I took of PN ESO 216-2, the field star GSC 08225-985 is recorded more like a faint fuzzy DSO rather than having a stellar profile like the other field stars. I was actually taking images of Planetary Nebula PN G288.7+08.1 (ESO 216-2) at R.A. 11h18m09.7s Dec. -52°10'02" (2000) in Centaurus, Magnitude: 15.50, Size: 36" when I noticed that the field star (GSC 08225-985) looked distinctly fuzzy and unlike the other nicely resolved field stars. It appears more like the faint PGC Galaxies I often see in my images.
The “fuzzy” field star is identified as:
SkyTools 4 Imaging Data:
J111827.8-520821
R.A. 11h18m27.9s Dec. -52°08'21" (2000)
Centaurus
Magnitude: 13.22
The Sky X Pro Data:
Object Name: GSC 8225:985
RA (2000.0): 11h 18m 27.8s
Dec (2000.0): -52° 08' 21"
Magnitude: 14.14
I have checked the "Sesame Name Resolver" on-line Query and it returned:
J111827.8-520821 11:18:27.8 -52:08:21
I also checked "Aladin Lite" and on that image the object appears in the Gaia EDR3 and 2MASS databases.
I have attached 5 files showing this “fuzzy” object, from the basic Raw File to Files with Labels and IDs from the SkyTools 4 Imaging Application.
I took a similar series of images on 6th June with a different camera (ZWO ASI 1600 MM Pro) and with the telescope tube rotated in a different position (approx. 45 degrees) and the same “fuzzy” object appears in that image too, so it is unlikely to be camera related or some reflection artefact?
The imaging system is:
Takahashi Mewlon 210 F11.5 (210mm aperture)
Takahashi x0.8 Reducer
F9.4 at 1932mm focal length
ZWO AIS 294 MM Pro Cooled Camera
106 x 30 sec exposures
Cheers
Dennis Simmons