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NGC457 - The Owl Cluster
(C) 2009-2012 by Leonardo
Orazi - All rights reserved
1920
x 1917 (Full Resolution)
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| About: |
NGC 457 (also known as the Owl Cluster,
the ET Cluster, or Caldwell 13) is an open star cluster in the
constellation Cassiopeia. It was discovered by William
Herschel in 1787 and lies over 7,900 light years away from the
Sun. It has an estimated age of 21 million years. The cluster
is sometimes referred by amateur astronomers as the Owl
Cluster, Kachina Doll Cluster, the ET Cluster (due to its
resemblance to the movie character) or the "Skiing Cluster".
Two bright stars, magnitude 5 Phi-1 Cassiopeiae and magnitude
7 Phi-2 Cassiopeiae can be imagined as eyes. The cluster
features a rich field of about 150 stars of magnitudes 12-15
..
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| Pubblications |
NASA/EOS/USRA - EPOD
17 February 2013 |
| Optics: |
GSO RC 10" F8 2000mm -
Astrograph Ritchie-Chrétien |
| Mount: |
AP Mach1 GTO on Gemini Q-Lock
tripod |
| Camera: |
QSI-640WSG |
| Filters: |
Astrodon I Series Gen II
LRGB 1.25" |
| Guiding Systems: |
SXV-AO-LF Active Optics -
SX Lodestar |
| Dates/Times: |
12 November 2012 |
| Location: |
Pragelato - Turin - Italy |
| Exposure Details: |
L:R:G:B => 80:30:30:30 =
> (16x5):(6x5):(6x5):(6x5) All Bin1 [num x minutes] |
| Cooling Details: |
-25 °C |
| Acquisition: |
Maxim DL/CCD, Perseus |
| Processing: |
CCDStack2,PS CS5 |
| Mean FWHM: |
2.35" |
| SQM-L: |
20.61 |
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H içbir
yazı/ resim izinsiz olarak kullanılamaz!! Telif hakları uyarınca
bu bir suçtur..! Tüm hakları Çetin BAL' a aittir. Kaynak gösterilmek şartıyla siteden
alıntı yapılabilir.
© 1998 Cetin BAL - GSM:+90 05366063183 -Turkiye / Denizli
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