The pre-SN2005cs image (left) was taken on 23 June 2004 at the Mount Wilson Observatory. The post-SN2005cs image (right) was
taken from the same location on 15 July 2005, approximately 15 days after its discovery by amateur astronomer Wolfgang
Kloehr of Schweinfurt, Germany. Tic marks on the right image indicate the location of the supernova, lying 15" west
and 67.3" south of M51's nucleus at RA 13h29m52.85s DEC +47°10'36.3". Shining at approximately magnitude
14.3 during the time of this image (Julian date 2453567.727083), the progenitor of this Type II
supernova is suspected to be a moderately sized red supergiant star having a
mass between 7 and 12 solar masses.


The Details
Supernova SN2005cs in M51 (NGC 5194)
12.5" RCOS Ritchey-Chretien at f/6.9 (pre-SN image)
16" Meade LX1200 at f/6.3 (post-SN image)
Astro-Physics 1200 GTO
Meade LX 200 Mount
SBIG ST-10XME (pre-SN image)
SBIG ST-8XE and AO-7 Adaptive Optics Unit (post-SN image)
Tru-Balance LRGB filter set
23 June 2004 (pre-SN image)
15 July 2005 (post-SN image)
Mount Wilson Observatory, Mount Wilson CA (both images)
L 6 x 600 sec 1x1 bin, RGB 3ea x 300 sec 2x2 bin (pre-SN image)
L 6 x 300 sec 1x1 bin, RGB set from pre-SN image (post-SN image)
Maxim DL/CCD, Registar, Photoshop CS
North angle approximately 300°; east 90° CCW from north
Images by Dave Jurasevich. Additional credit for the post-SN2005cs luminance frames is given to Jean Anne Currivan (UC Berkeley) and Amanda Lukas (University of Pittsburgh). Both were 2005 CUREA (Consortium for Undergraduate Research and Education in Astronomy) students at the Mount Wilson Observatory and assisted in acquisition of the images that evening.




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