NGC 7139 (PK 104+7.1) Planetary Nebula in Cepheus

Located at: RA 21 hours 46 minutes 09 seconds, Dec +63 degrees 47 minutes 31 seconds

Size: 77" Magnitude: 13.3 photographic Class: 3b

North is up

West to the right

Telescope:

 14.5" f5 Newtonian reflector

Camera:

 ST-8XME, self-guided, binned 1x1, temp -15c & -20c, camera control MaxIm DL 4.56

Image:

Lumicon Red filter, 640 minutes (64 x 10 minute subs), 08/13/17/18/19/2013; seeing 3.2-4.2 FWHM per CCDStack

Processing:

CCDStack 2.75.4973.15338, Photoshop CS5.1

Location:

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

Notes: Continuing imaging Cygnus & Cepheus Planetary Nebulae into the end of August ...

View 200% crop.

From the NGC / IC Project:

Contemporary Visual Observation(s) for NGC 7139
NGC 7139 = PK 104+7.1 = PN G104.1+07.9
21 46 08.6 +63 47 29
V = 13.4;  Size 86"x70"

18" (8/17/04): easily picked up at 115x unfiltered.  At 225x appears moderately 
bright and large, slightly elongated ~N-S, ~1.2'x1.0'.  A mag 13.5 star is just 
off the SE end.  The rim appears to be slightly brighter, particularly along the 
SE side towards the mag 13.5 star.

17.5" (10/13/01): easily picked up sweeping at 100x without a filter.  Appears 
moderately bright, round, 1.2' diameter, crisp-edged.  A mag 13.5 star is off 
the SE edge.  Excellent view at 280x without filter.  The surface brightness 
appears irregular with a slightly brighter rim, particularly along the eastern 
half of the rim.  An extremely faint star is intermittently visible right at the 
NE edge.  A nice, elongated group of 6-8 stars follows the planetary in the same 
high power field.  Central star not seen at 280x.

17.5" (8/8/91): moderately bright, fairly large, slightly elongated, 1.2' 
diameter.  A mag 13.5 star is just off the SE edge 40" from the center.  A 
slightly darker center is visible with an OIII filter at 140x but the annularity 
is subtle.  No central star visible.

8" (8/28/81): extremely faint, moderately large, round, difficult, a faint star 
is near the south edge.  Located about 4' NW of a faint curving arc of stars and 
23' E of mag 7 SAO 19595.  This is one of the faintest planetaries observed with 
the C8.

The declination given incorrectly at +63? 39' (2000) in the RNGC, SC2000, 
Strausberg, Hynes, N2000 and U2000. The position is correct in the NGC, PK and 
Skiff. Error discovered by KW and verified on POSS, SG.  Exact position 21h 44m 
49.8s +63? 33' 33" (1950).

- by Steve Gottlieb