NGC 6905 (PK 61-9.1) Planetary Nebula in Delphinus

Located at: RA 20 hours 22 minutes 23 seconds, Dec +20 degrees 06 minutes 16 seconds

Size: 72" x 37" Magnitude: 11.9 photographic Class: 3+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, 450 minutes  (45 x 10 minute subs), 10/16/17/2013; seeing 3.9-4.8 FWHM per CCDStack


CCDStack 2.75.4973.15338, Photoshop CS5.1


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


The faint N-S extensions that give this object a 73 second size are not well recorded in the 450 minutes exposure. See the extensions in this CDS POSSII/J/DSS2 image.

View 200% crop.

From the NGC / IC Project:

Contemporary Visual Observation(s) for NGC 6905

NGC 6905 = PK 61-9.1 = PN G061.4-09.5 = Blue Flash Nebula
20 22 23.0 +20 06 16
V = 10.9;  Size 47"x37"

18" (8/23/03): beautiful planetary at 320x.  The faint central star is visible 
continuously with direct vision.  At 538x, the central star is easily visible 
continuously. The interior seems unevenly lit and there appears to be a very 
slightly darker "hole" to the north of the central star.  Bracketed by a mag 11 
star off N edge and a mag 12 star just off the S edge and the planetary is 
slighly elongated N-S in the direction of these stars.

17.5": very pretty planetary at 280x.  Fairly bright, fairly small, slightly 
elongated.  A very faint central star (V = 15.7) is visible.  Takes 440x well.  
Just off the north edge is a mag 11 star 1.4' from center and a mag 12 star is 
just off the south edge 39" from center.

8": moderately bright, uniform, slightly elongated N-S, two stars at the NE and 
S edge.

- by Steve Gottlieb