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(IAAC) Obj: ngc 1491 - Inst: 20" f/5 dob newt
Observer: Lew Gramer
Your skills: Intermediate
Date and UT of Observation: 1997-07-5/6, 04:40 UT
Location: Savoy, MA, USA (42N, elev 700m)
Site classification: rural
Limiting magnitude: 7.3 (zenith), 7.0 (in N), 16.5+ (20", 210x)
Seeing: 3 of 10 - pretty good
Moon up: no
Instrument: 20" f/5 Tectron truss-tube dob Newtonian reflector
Magnification: 70x, 210x
Filters used: None
Object: ngc 1491
Category: Emission nebula
Constellation: Per
Data: mag 11 (star) size 3'x3' (catalog)
RA/DE: 04h03m +51o18m
Description:
Even in this magnificent sky, n1491 was an indisitinct blur at
both 70x and 210x. At 210x, it did show itself to be elongated
NNE-SSW, approx. 4' long and 2' wide, with a SLIGHTLY brighter
"bar" or bright area of nebulosity near the center of the neb.,
which was itself elongated N-S, and about 90" x 60" in size.
The N edge of the whole mass was about 4' SW of a mag. 11 star.
Stupidly(!), I did not try any filters (DeepSky, UHC, OIII) on
this emission nebula on this occasion... Guess it'll be worth
another look later this Summer or Fall, under similar skies!
[Telescope limiting magnitude was found using Luginbuhl and
Skiff's photometric data for ngc 6802 in Vulpecula - handy!]