| Classification: |
Diffuse Emission Nebula / IC11 / IC1590 / Sh2-184 / LBN616 |
| Constellation: |
Cassiopeia (Cas) |
| Object Location: |
Ra 00h 53m 54s Dec +56° 42’28° (current) |
| Size & Distance: |
35.0 x 35.0 Apx 9500 light years. |
|
| Date & Location: |
11-01-2013 Little Blair Valley, CA. |
| Exposure: |
Hubble Palette SHO, Sll=R, Ha=G, Olll=B, 11 ea. @ 15min (bin 1x1) |
| Optics: |
Telescope Engineering Company APO160FL @ f/7.2 F/L 1152mm. |
| Mount: |
Astro-Physics 1200 GTO / ATS 10x36 pier. |
| Camera: |
FLI-ML6303E @-20c / CFW2-7 / FLI-PDF / Guided by TV60APO, SBIG-RGH |
| Filters: |
Astrodon 3nm Ha, Sll, Olll. |
| Software: |
MaxImDL 4.56, Photoshop CS5, Topaz Labs. |
|
| Notes: |
Sky conditions: Above average seeing, No wind, Temp 35°
Image Field of view is 55 x 82 arcmin.
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. NGC 281 is an H II region in the constellation of Cassiopeia and part of the Perseus Spiral Arm. It includes the open cluster IC 1590. NGC 281 is also known as the Pacman Nebula for its resemblance to the video game character.
The nebula was discovered in August 1883 by E. E. Barnard, who described it as "a large faint nebula, very diffuse. There has been no appreciable change in this quintuple system since the first measurements were made in 1875.
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