NGC 40 (PK 120+9.1) Planetary Nebula in Cepheus

Located at: RA 00 hours 13 minutes 01 seconds, Dec +72 degrees 31 minutes 19 seconds

Size: 70" x 60" Magnitude: 10.7 photographic Class: 3b+3

North is up

West to the right


14.5" f5 Newtonian reflector


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


Lumicon Red filter, 210 minutes (21 x 10 minute subs), 09/28/2012; seeing 3.1-4.1 FWHM per CCDStack


CCDStack 2.66.4490.32361, Photoshop CS5.1


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

Notes: I imaged NGC 40 and M 57 (one night each) while waiting for the moon to clear the area of NGC 7479 ...

See 200% crop.

From the the NGC / IC Project:

Contemporary Visual Observation(s) for NGC 40
NGC 0040 = PK 120+9.1 = PN G120.0+09.8
00 13 01.0 +72 31 19
V = 10.6;  Size 38"x35"

17.5" (12/30/99): at 100x appeared (unfiltered) as a slightly elongated, 
moderately bright disc surrounding a bright mag 11.5 central star. A slightly 
fainter mag 12 star lies 1.0' SW.  This is a low excitation PN with an OIII/H-
beta ratio of just 0.4 and at 100x there was a noticeable enhancement using the 
H-beta filter while it dimmed with an OIII.  At 220x, a star was intermittently 
visible at the SW edge and the PN was slightly elongated SSW-NNE.  The best 
filter response with this power was using the UHC.  The surface brightness 
appeared irregular -- darker around the central star and slightly brighter along 
the west and east side of the rim.  At 280x, the faint star I had noted earlier 
was barely off the SW edge and PN was weakly annular with a brighter rim along 
the W and E side and a darker center.  The SW and NE ends of the halo were 
clearly weaker, though.  380x provided a nice view with subtle irregularities in 
the interior.

17.5" (11/1/86): bright, moderately large, round.  Contains a prominent mag 11.5 
central star surrounded by a fairly bright halo.

13" (12/7/85): at 166x, bright central star visible centered within a fairly 
small prominent disc.

13" (10/12/85): moderately large, bright central star surrounded by a moderately 
bright halo at 166x-214x using a UHC filter.

8": the bright central star is surrounded by an easy halo.

- by Steve Gottlieb