NGC 6572 (PK 34+11.1) Planetary Nebula in Ophiuchus

Located at: RA 18 hours 12 minutes 06 seconds, Dec +06 degrees 51 minutes 11 seconds

Size: 11"  Magnitude: 9.0 photographic Class: 2a

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,  8.33 minutes  (100 x 0.083 minute {5 seconds} subs), 07/24/2014; seeing 2.0-3.0 FWHM per CCDStack

Processing:

CCDStack 2.80.5308.25197, Photoshop CS5.1

Location:

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

Notes: Another high surface-brightness planetary nebula. As with IC 2165, I used the best (seeing) 100 subs (out of 210) for this image. See the CDS image/data.

View 200% crop.

Contemporary Visual Observation(s) for NGC 6572
NGC 6572 = PK 34+11.1 = PN G034.6+11.8 = ?6 = Emerald Nebula
18 12 06.3 +06 51 13
V = 8.0;  Size 16"x13"

18" (8/2/05):  at 225x I noticed an interesting color effect;  
although the color was a quite prominent bluish-green, while staring  
at the center the planetary decreased in size but the color changed  
to a deep emerald green.

18" (8/14/04): at 225x, strikingly bright emerald green oval,  
slightly elongated ~N-S, ~15"x12".  Increasing to 435x this compact  
planetary appears elongated 3:2, ~16"x11" and brightens towards the  
center with direct vision, although the color becomes bluish and  
washed out.  The surface brightness is too high to pick out a central  
star.  There appears to be small, faint envelope which encases the  
planetary.

18" (7/19/04): at 225x this small planetary is very bright, with an  
obvious blue-green color.  Generally, the color appeared a vivid  
emerald green and other times there was bluish tint to the color.   
The main body is only ~8" in size with a thin halo elongated ~SW-NE  
increasing the size to roughly 15"x11".  It appears to have a much  
larger, very low surface brightness halo, though perhaps this is  
scattered light as the planetary has such as a high surface  brightness.  
This halo is still evident at 322x appears ~30" in  diameter.

17.5" (6/3/00): at 220x appears as a very bright, small, intense blue  
oval, ~15"x12".  At 280x-500x, a thin outer envelope is obvious with  
the inner oval a uniform high surface brightness.  No central star  
visible.

13" (8/24/84): very bright, small,  about 15" diameter, slightly  
elongated N-S, extremely high surface brightness, blue color.  Very  
faint outer halo is elongated N-S.  No central star seen.

8" (7/79): bright, small, very high surface brightness.

- by Steve Gottlieb