NGC 90 (UGC 208, Apr 65) Group Galaxies in Andromeda

NGC 90 is located at: RA 00 hours 21 minutes 52 seconds, Dec +22 degrees 24 minutes 01 seconds

NGC 91 size: 3.0' x 0.9' Magnitude: 13.6 visual Class: SAB(s)c pec

North is up

West to the right

Telescope:

 14.5" f5 Newtonian reflector

Camera:

 ST-8XME, self-guided, binned 1x1, temp -15c, camera control MaxIm DL 4.56

Image:

Lumicon Red filter, 680 minutes (68 x 10 minute subs), 10/28/29/30/2014; seeing 2.0-3.4 FWHM per CCDStack

Processing:

CCDStack 2.84.5400.22239, Photoshop CS5.1

Location:

 Rolling Roof Observatory, Thousand Oaks, CA 91360 (+34d 13m 29s -118h 52m 20s)

Notes: The galaxy group is centered on Arp 65 ... My software (Megastar v5.0.14) names the small spiral NGC 91: However, NED, and the NGC/IC Project say it is NGC 90 ...

The other NGC galaxies in the group are (from west to east <right to left>) NGC 80, 81, 83, 85, (90/91 centered), 93, and 94. See this marked image.

From the NGC / IC Project:

Contemporary Visual Observation(s) for NGC 90
NGC 0090 = UGC 00208 = MCG +04-02-011 = CGCG 479-013 = Arp 65 = PGC 01405
00 21 51.4 +22 24 00
V = 13.7;  Size 1.9x0.8;  SB = 14.0;  PA = 132d

17.5" (9/19/87): very faint, small (only the central portion of the galaxy 
observed), slightly elongated, weak concentration.  A mag 12 star is 1.3' SW.  
Forms a pair with NGC 93 2.8' E.  Located on the E side of the NGC 80 group 7.0' 
ESE of NGC 83.

13" (9/29/84): very faint, elongated NW-SE.  A mag 13 star is 1' SW.

All modern catalogues identify this galaxy (U00208 = M+04-02-011 = CGCG 479-013 
= Arp 65) as NGC 91 although Schutz's position for NGC 91 falls precisely on a 
very faint star 1.9' S of this galaxy and his position for NGC 90 is an exact 
match with U00208.  See NGCBUGS for discussion.

- by Steve Gottlieb
Historical Research Notes / Correction for NGC 90
NGC 90, 91, and NGC 93.  Dreyer has confused the observations of these
objects.  Lord Rosse's observations make it clear that he and his assistants
saw only two nebulous objects here, so one of the ``Ld R''s has to be
striken from the ``Other Observers'' column of the NGC.  The offsets make it
clear that the Irish observers saw what we now call NGC 90 and NGC 93.

What do the observations of Schultz and d'Arrest have to say?  Schultz's
positions for all three objects -- not just one as the NGC credits --
precessed from the published equinox of 1865.0, agree to within two or three
arcsec in all three cases with modern data from GSC.  These pin down the
three objects and show that NGC 91 is a star (Bigourdan also called the same
star NGC 91).  D'Arrest's positions are not quite as good, but fall within
20 arcsec of the galaxies.  His descriptions of the locations and magnitudes
of the nearby stars are also exact, and confirm the identifications.

So, NGC 90 should be credited to Lord Rosse, Schultz, and d'Arrest (rather
than just Lord Rosse and Schultz), NGC 91 to Schultz alone (Lord Rosse and
d'Arrest never commented on this star), and NGC 93 again to all three
observers.  To the description for NGC 90 should be added ``* 13 sp''.

There are several other identification problems in the NGC 80/83 Group, too.
See NGC 81, 82, and 84, as well as IC 1547. - Dr. Harold G. Corwin, Jr.