M 17 (Sh2-45) / NGC 6618 (Lund 827, Cr 377) Bright Nebula / Open Cluster in Sagittarius

Located at:* RA 18 hours 20 minutes 45 seconds, Dec -16 degrees 10 minutes 00 seconds

Size: 11' x 6.0' / 27' Magnitude: 6.9 / 6.0 Class: Emission (Sharpless) 3 3 3 / III 3 m n

North is up

West to the right


8" f5 Newtonian reflector


 ST-8XME, self-guided, binned 1x1, temp -10c, camera control MaxIm DL 4.56


Lumicon Deep Sky filter, 250 minutes (25 x 10 minute subs), 09/2/3/2007


CCDStack 1.3, Photoshop 7.0


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

Notes:* M 17 is also known as the 'Swan, Checkmark, Horseshoe and Omega' nebula. The open cluster NGC 6618 fills the east (left) side of this image. M17's nebulous designations are Sh2-45 and LBN 60. Associated with the larger field is the bright nebula IC 4706-07 off to the west (right). See the 14.5" version.

From the NGC / IC Project:

Contemporary Visual Observation(s) for NGC 6618
NGC 6618 = M17 = Swan Nebula = Omega Nebula = LBN 60 = Sh 2-45
18 20 47 -16 10.3
V = 6.0;  Size 46x37

13.1": the "Swan Nebula" is very bright, very large, with fantastic detail along 
the bright bar.  Has a turbulent texture with dark areas near the "hook".  A 
nebulous halo surrounds the brighter star to the S.

8": very bright, large, very detailed.  The brightest portion consists of a long 
bright ray which hooks S at the Wst end.  A fainter section oriented N-S section 
follows.  The main bar is mottled.  The irregular hooked portion is clearly 
mixed with a dark nebula intruding.  Fainter nebulosity is visible N and S of 
the main bar.

- by Steve Gottlieb