NGC 4395 (UGC 7524) Galaxy in Canes Venatici

Located at: RA 12 hours 25 minutes 50 seconds, Dec +33 degrees 32 minutes 46 seconds

Size: 13.3' x 11' Magnitude: 10.6 blue Class: SA(s)m:

North is up

West to the right

Telescope:

 8" f5 Newtonian reflector

Camera:

  ST-8XME self-guided, binned 1x1, temp -20c, camera control MaxIm DL 4.56

Image:

Lumicon Red filter, 800 minutes  (80 x 10 minute subs) 05/8/9/10/11/14/15/2010; seeing 1.8-3.7 FWHM per CCDStack

Processing:

CCDStack 2.5.3769.13366, Photoshop 7.0

Location:

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

Notes: From the NGC / IC Project:

Contemporary Visual Observation(s) for NGC 4395

NGC 4395 = UGC 07524 = MCG +06-27-053 = CGCG 187-042 = PGC 40596
12 25 48.9 +33 32 51
V = 10.2;  Size 13.2x11.0;  SB = 15.4;  PA = 147d

17.5" (5/15/99): N4395 is a chaotic galaxy dominated by several bright HII 
regions. At 100x, the large low surface brightness glow is clearly clumpy with a 
couple of faint knots evident on the east side of the haze. At 220x, the glow of 
the galaxy is more difficult to view and several nonstellar knots and a couple 
of very faint superimposed stars are more prominent. The brightest HII region is 
N4401 located 2' SE of the core, ~25" in size, with a second smaller 15" knot 
(N4400) close south. The core of the galaxy appears as an ill-defined low 
surface brightness glow, larger than the individual HII knots.  A mag 14.5 star 
is superimposed NE of the core. On the SW side of the core is a third difficult 
knot, about 15" in diameter (N4399) requiring averted vision to confirm.

17.5": faint, very large, extremely low surface brightness, must use low 
magnification to view.  Three knots are involved (one of these observed "knots" 
may be the core) within a very diffuse glow.  The brightest knot (N4401) is at 
the SE end about 2' SE of center with N4400 close SSW of N4401.  A mag 14.5 star 
is at the N end.  Also see description for N4399.

13" (4/12/86): at 62x appears very large, diffuse, slightly elongated glow, 
broad very weak concentration.

- by Steve Gottlieb
Historical Research Notes / Correction for NGC 4395
NGC 4395.  See NGC 4399 which, along with NGC 4400 and NGC 4401, are HII 
regions in NGC 4395. - Dr. Harold G. Corwin, Jr.
Contemporary Visual Observation(s) for NGC 4399
NGC 4399
12 25 42.8 +33 30 57

17.5": faintest of three HII knots observed in N4395.  Appeared extremely faint 
and small, 10"-15" in size and situated 2.3' SW of the ill-defined core on a 
line with a mag 14.5 star to the NE of the core.  Required averted vision to 
confirm.

This is an HII region or condensation in N4395 on the SW side.  See Rosse sketch 
which shows 4 objects (agrees with the POSS) - one of which is the core 
(furthest N).  Listed in RNGC Corrections #4.  Corwin gives a 2000 position 12 
25 42.8 +33 30 57 which is just following a mag 15 GSC star.

- by Steve Gottlieb
Historical Research Notes / Correction for NGC 4399
NGC 4399, NGC 4400, and NGC 4401 are bright HII regions in NGC 4395.  WH found
N4395 and N4401, the main body of the galaxy and the brightest HII region, 
recording them as two nebulae under one number.  Thus, the NGC has the WH 
numbers given rather awkwardly as "V 29.1" and "V 29.2."  Lord Rosse (or 
his observers) found the other two objects, but did not measure their offsets
from nearby stars or the nucleus.  Instead, they printed a diagram which can 
be pretty easily related to the sky, in spite of some distortion.  The lack of 
offsets also allowed Dreyer to give only approximate positions for N4399 and 
N4400.  Lord Rosse's sketch of the field, however, makes the identifications 
clear. - Dr. Harold G. Corwin, Jr.