NGC 2403

Posted by CraigAndTammy
on Thursday, April 8, 2010

by Craig and Tammy Temple

NGC 2403 is a magnitude 8.90 spiral galaxy approximately 8 million light years distant in the constellation Camelopardalis. Noteworthy is its H II nucleus. Discovered in 1788 by William Herschel, NGC 2403 is a distant member of the M81 Group. Visible in this image is supernova SN 2004dj, discovered by Koichi Itagaki on July 31, 2004.

Telescope: Celestron C8 Schmidt-Cassegrain
Accessories: Celestron f/6.3 reducer/corrector; Dew control by Dew Buster®
Mount: Orion Atlas EQ-G controlled by EQMOD
Guiding: Orion StarShoot AutoGuider on William Optics ZS66
Camera: Canon Digital Rebel T1i, Hap Griffin Baader modified
Filters: Astronomik CLS-CCD EOS Clip
Exposure: 93 x 300sec @ ISO 800 (7hr. 45min.)
Acquisition: ImagesPlus 3.82 Camera Control
Processing: ImagesPlus 3.80a – Calibrated, registered, averaged, DDP
Post-processing: Adobe Photoshop CS4; Gradient XTerminator; Noise Ninja; Noel Carboni's Tools
Date(s): March 26, 30 & 31, 2010
Temperature(s): N1:48ºF (dropped to 45ºF); N2:59ºF (dropped to 52ºF); N3:70ºF (dropped to 63ºF)
SQM reading (begin - end): N1:17.12 - 17.23; N2:18.49 - 18.25; N3:18.64 - 18.50
Moon data: N1: 88% illuminated, 59º angular separation; N2: 98% illuminated, 101º angular separation; N3: 94% illuminated, 111º angular separation

To leave a comment you must be a member of our community.
Login to your account now, or register for an account to start participating.
No one has commented yet.
Join our Community!

Our community is FREE to join. To participate you must either login or register for an account.


Receive news, sky-event information, observing tips, and more from Astronomy's weekly email newsletter. View our Privacy Policy.

Find us on Facebook