M 1 (Crab Nebula)
The Crab Nebula (M1, NGC 1952) is a supernova remnant in the constellation of Taurus. The nebula was discovered by John Bevis in 1731. Subsequently it was found that this nebula corresponds to a bright supernova recorded by Arab, Chinese and Japanese astronomers in 1054. With it's X-ray and gamma-ray energies above 30 keV, the Crab nebula is generally the strongest persistent source in the sky. Located at a distance of about 6,500 light-years (2 kpc) from Earth, the nebula has a diameter of 11 ly (3.4 pc) and expands at a rate of about 1,500 kilometers per second. A short video showing the expansion of M1 can be found here.
This is my first attempt to put together data from my 12" ASA Astrograph and those from 2m RCC telescope at NAO Rozhen (courtesy Niki Petrov and Yanko Nikolov). Unfortunately the data from RCC (actually I used only the red channel) doesn't cover the whole field, hence the drop in the resolution at the outer part of the Nebula.
|Objects:||M 1 (NGC 1952)|
|Center of field:||RA: 03h 34m 31s Dec: +22° 00' 52"|
|Field dimensions:||Ca 8 x 12 '|
|Optics:||12" ASA Astrograph at F/6.8; 2m RCC telescope at NAO Rozhen|
|Mount:||ASA DDM 85|
|Camera:||SBIG STL-11000M , VersArray 1300B|
|Filters:||Astronomik RGB filters,|
|Dates/Times:||10, 14 November 2011|
|Exposure Details:||R,G,B (ASA)= 50 min. R (RCC, used as L) = 15 min|
|Subexposures:||R,G,B (ASA) = 10 minutes, RCC = 90 sec|
|Processing:||PixInsight, Photoshop CS|