NGC 6818 (PK 25-17.1) Planetary Nebula in Sagittarius

Located at: RA 19 hours 43 minutes 58 seconds, Dec -14 degrees 09 minutes 10 seconds

Size: 48" Magnitude: 9.9 photographic Class: 4

North is up

West to the right

Telescope:

14.5" f5 Newtonian reflector

Camera:

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

Image:

Lumicon Red filter, 75 minutes (30 x 2.5 minute {150 seconds} subs), 09/19/2013; 3.2-4.3 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:* I imaged a couple of planetary nebulae (see NGC 7662) while waiting the Moon to clear the area of NGC 6822.

View 200% crop.

From the NGC / IC Project:

Contemporary Visual Observation(s) for NGC 6818
NGC 6818 = PK 25-17.1 = Little Gem Nebula = PN G025.8-17.9
19 43 57.7 -14 09 11
V = 9.4;  Size 22"x15"

17.5" (7/12/99): at 100x this striking PN is bright and small with an obvious 
blue color.  The high surface brightness easily allows high power.  At 380x, 
there is subtle but obvious structure with a darker center and irregular 
brightness to the halo.  Most noticeably the PN is brighter on the east end and 
mildly annular.  Appears slightly elongated N-S, ~20"x15" in size.  Three mag 
13-13.5 stars are near - 40" NW, 1.0' E and 1.3' SW.

17.5": at 412x appears very bright, fairly small, slightly elongated N-S, blue 
color, very high surface brightness.  Appears brighter along the E side and 
slightly brighter along the W side compared to the center.  Has a darker 
elongated center but the annularity has a pretty low contrast.  Barnard's galaxy 
N6822 lies 40' SSE.

13": very bright, slightly elongated N-S, fairly small.

- by Steve Gottlieb
Historical Research Notes / Correction for NGC 6818
NGC 6818.  See NGC 6822 = IC 4895. - Dr. Harold G. Corwin, Jr.