NGC 6742 (PK 78+18.1, Abell 50) Planetary Nebula in Draco

Located at: RA 18 hours 59 minutes 20 seconds, Dec +48 degrees 27 minutes 53 seconds

Size: 36" x 30" Magnitude: 15.0 photographic Class: 2c

North is up

West to the right

Telescope:

 14.5" f5 Newtonian reflector

Camera:

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

Image:

 Lumicon Red filter, 710 minutes (71 x 10 minute subs), 07/12/13/14/15/16/2016; FWHM 2.4-3.6 per CCDStack

Processing:

CCDStack 2.92.6001.26126, Photoshop CS5.1

Location:

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

Notes: This Abell planetary nebula is faint for an NGC object ... although the blue images are brighter than the red images on the POSS plates. Since I use a red filter, my version took a little more exposure than a blue filtered image would.

View 200% crop.

From the NGC / IC Project:
Contemporary Visual Observation(s) for NGC 6742
NGC 6742 = PK 78+18.1 = Abell 50 = PN G078.5+18.7
18 59 19.7 +48 27 57
V = 13.4;  Size 31"x30"

18" (7/19/04): beautiful view at 322x, appears moderately bright, fairly small, 
round, crisp-edged, ~30" diameter.  The rim is slightly brighter giving a weak 
but definite annular appearance.  A mag 15 star is just off the NNE edge and a 
mag 15.5-16 star is intermittently visible right at the west edge of the halo.

17.5" (7/22/01): moderately bright, fairly small, perfectly circular.  Easily 
picked by scanning region at 100x just 3.5' NE of mag 8.9 SAO 47978.  Appears 
unevenly lit at 280x, ~30" diameter with slightly enhanced regions along the 
rim.  A very faint star is off the NE edge.

17.5" (5/11/86): at 220x without filter appears fairly faint, round, fairly 
small.  At 105x using an OIII filter the planetary is bright and compact with 
crisp round edges.

- by Steve Gottlieb