M 16 / IC 4703 (NGC 6611, Lund 825, Cr375 / Sh2-49)

Open Cluster / Bright Nebula in Serpens

Located at: RA 18 hours 18 minutes 43 seconds, Dec -13 degrees 48 minutes 00 seconds

Size: 6.0' (8.0') / 28' x 17' Magnitude: 6.0 / -- Class: II 3 m n / Emission (Sharpless) 3 3 3

North is up

West to the right

Telescope:

 8" f5 Newtonian reflector

Camera:

 ST-8XME, self-guided, binned 1x1, temp -20c, camera control MaxIm DL 4.55

Image:

 Red (Hoya 25A) filter, 250 minutes (25 x 10 minute subs), 08/19/21/2006

Processing:

 CCDStack 1.2, Photoshop 7.0

Location:

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

Notes: This field is a combination of a fairly bright open cluster (M 16), and a much fainter emission nebula (IC 4703 / Sh2-49). Near the center of the image is the so called "Pillars of Creation", made famous by the Hubble Space Telescope image.

According to "Star Clusters", by Brent Archinal and Steven Hynes, the size of this open cluster is 8.0 arc minutes.

From the NGC / IC Project:

Contemporary Visual Observation(s) for NGC 6611
NGC 6611 = M16 = IC 4703 = LBN 67 = Sh 2-49 = Eagle Nebula = Star-Queen Nebula
18 18 48 -13 48.4
V = 6.0;  Size 35x28

13.1": the "Eagle Nebula" is a fairly bright 30' nebulosity in a striking 
outstretched eagle shape with a bright scattered cluster superimposed.  There is 
a considerable contrast gain to the nebulosity using a UHC or OIII filter.  With 
a UHC filter, a dark projection (called the "Star Queen") enters on the SE edge 
of the nebula and extends inward to the west.  Also a thin dark "finger" extends 
even further towards the open cluster.  The cluster members surrounding the 
"head" of the eagle include ten mag 8-10 stars with a bright pair of mag 8.5 
stars (8.2/8.8 at 27").  A dark triangular wedge is visible off the north side.

- by Steve Gottlieb