NGC 1931 and IC 417

NGC 1931
All Images Copyright Steve Cannistra

Please click here or on image for a larger image.
Please click here for this image in Ha light.
This image was featured on NASA's Astronomy Picture of the Day.

Magnitude:  Unknown.
Size: NGC1931, 3 arcminutes; IC 417, 13 arcminutes.
RA: 05h 30m 01s
Dec: 34 degrees 19' 47"

These two nebulae are located in the Constellation Auriga (The Charioteer).  NGC 1931 is in the lower left, and IC 417 the upper right.  They both represent star clusters surrounded by nebulosity.  In fact, the entire region is filled with faint Ha emission that can be appreciated in the above image.  This region is not often imaged, but the juxtaposition of these two nebulae make for a photogenic pair.  I have dubbed these two targets "The Spider (IC 417) and the Fly (NGC 1931)", although you can name them whatever you like!  This image shows that NGC 1931 is a mixed emission and reflection nebula similar to the Cocoon or the Trifid Nebulae.

Photographic Details:

Date:  October 21, 2006.

Takahashi FSQ106 (second light image), on the G11 Losmandy Mount.
Autoguider:  SBIG STV with e-finder.
Camera:  Maxcam CM10
Astronomik Ha (6 nm) filter; Astronomik type II RGB filter set.
Exposures:  27 x 10' Ha; 7 x 5' R; 7 x 5' G; 8 x 8' B
Conditions:  Clear and cold- temperatures down to about 35 degrees F during the night.
Debloomed, calibrated, aligned in Maxim.  Combined using RC Sigma Reject MaximDL, followed by DDP in ImagesPlus (IP).  Subsequent processing in Photoshop CS (16 bit format).

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