NGC 3166 (UGC 5516) and NGC 3169 (UGC 5525) Galaxies in Sextans

Center of field at approximately: RA 10 hours 14 minutes 00 seconds, Dec +03 degrees 26 minutes 49 seconds

Size: 4.8' x 2.3' and 5.4' x 2.7'  Magnitude: 11.3 blue and 11.1 blue Class: SAB(rs)0/a HII and SA(s)a pec HII

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, 600 minutes (60 x 10 minute subs), 04/14/15/16/2015; seeing 2.8-5.0 FWHM per CCDStack

Processing:

CCDStack 2.89.5560.25580, Photoshop CS5.1

Location:

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

Notes: * I wanted to image something in my south, before the moon interfered; unfortunately, the off-shore winds (Santa Ana's) appear, making the seeing worse than the last object imaged (NGC 5371).
NGC 3166 to the west (right), NGC 3169 to the west (left). The small galaxy to the southwest (lower right) of NGC 3166 is NGC 3165 (1.8'x0.7', mag 14.5b, Cl: SA(s)dm:). See the incredible color image of this pair by Adam Block/Mount Lemmon Sky Center/University of Arizona.

From the NGC / IC Project:

Contemporary Visual Observation(s) for NGC 3166
NGC 3166 = UGC 05516 = MCG +01-26-024 = = CGCG 063-064 = PGC 29814
10 13 44.9 +03 25 31
V = 10.4;  Size 4.8x2.3;  SB = 12.9;  PA = 87d

17.5": bright, almost round, even concentration to a brighter core and stellar 
nucleus.  The core appears brighter than N3169 7.8' ENE but forms a pretty 
similar duo.  Second of three with N3165 4.6' SW.  Two mag 12.5 stars lie 2.6' 
NW and 2.8' SW of center.

13": fairly bright, bright core.  Forms a pair with N3169.

- by Steve Gottlieb

Contemporary Visual Observation(s) for NGC 3169
NGC 3169 = UGC 05525 = MCG +01-26-026 = CGCG 036-066 = PGC 29855
10 14 14.8 +03 28 00
V = 10.2;  Size 4.4x2.8;  SB = 12.8;  PA = 45d

17.5": bright, slightly elongated SW-NE, moderate concentration, pretty faint 
stellar nucleus.  A mag 11 star is just off the E side 1.6' from the center.  
Third of three with N3166 7.8' WSW and N3165 12' SW.

13": bright, bright core.

- by Steve Gottlieb

Contemporary Visual Observation(s) for NGC 3165
NGC 3165 = UGC 05512 = MCG +01-26-023 = CGCG 063-063 = PGC 29798
10 13 31.4 +03 22 32
V = 13.9;  Size 1.6x0.8;  SB = 14.0;  PA = 177d

17.5": very faint, elongated 2:1 N-S.  Forms the western vertex of a triangle 
with two mag 12.5 stars 1.9' SE and 1.7' NE.  First and faintest of three 
located 4.6' SW of N3166 and 12' SW of N3169.

- by Steve Gottlieb