NGC 1491 (LBN 704, Sh2-206) Bright Nebula in Perseus

Located at: RA 04 hours 03 minutes 36 seconds, Dec +51 degrees 18 minutes 00 seconds

Size: 21' Magnitude: -- Class: Emission (Sharpless) 3 2 3

North is up

West to the right

Telescope:

 8" f5 Newtonian reflector

Camera:

 ST-8XME, self-guided, binned 1x1, temp -25c, camera control MaxIm DL 4.56

Image:

Lumicon Red filter, 1040 minutes (104 x 10 minute subs), 12/6/7/9/10/2010; seeing 2.4-3.9 FWHM per CCDStack

Processing:

CCDStack 2.65.4464.17853, Photoshop CS5.1

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 1491

NGC 1491 = LBN 704 = Sh 2-206
04 03 13.6 +51 18 58
Size 3x3

17.5" (3/2/02): at 100x, this is a moderately bright, roundish glow,~3' 
diameter, mostly west of a mag 11 star.  Excellent contrast gain with an OIII 
filter as it appears bright, with an irregular surface brightness and it wraps 
around the mag 11 star, particularly on the north side.  There is a subtle bite 
cut out of the nebulosity from the east side that creates a darker hollow 
extending just west of the star.  At 220x (unfiltered), about a half dozen stars 
are involved or at the edges.  The nebulosity is quite irregular with a high 
surface brightness region preceding the star.  Faint, elongated haze extends 
from this patch to the NE past the star giving an elongated appearance.  A pair 
of mag 13-14 star are at the northern end and another pair are just off the 
western edge.

17.5" (12/8/90): at 140x with OIII filter appears as a bright, moderately large, 
circular nebulosity involving a mag 11 star.  The brightest portion lies to the 
west of the star and is elongated 3:2 ~N-S.  There appears be a dark gap just 
west of the mag 11 star.  Two very faint stars are superimposed near the edges.

13": bright emission nebula just E of a mag 10.5 star, extends SW-NE, 
interesting shape.

8": bright, large, ~6' diameter.  A mag 10.5 star is at the E side.

- by Steve Gottlieb