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Supernova in the Pinwheel Galaxy M101 


SN in NGC2554
SN in NGC1961
SN 2013df
SN 2013dy




Some 21 million years ago, around the time that the first known bipedal ape was believed to walk upright on two legs,  a dying star in the Galaxy M101 ( Pinwheel Galaxy) exploded.

 The light from the explosion reached us around 08/24/2011 when it was discovered by   the Palomar Transient Factory  and has been designated "PTF11kly". The object, when discovered was at a magnitude of g=17.2, however as of this day (8/30/2011) it had increased to  around 13.4 mag. The object is well placed within M101 for good photometry.

The (J2000) coordinates reported for the object are
RA: 14:03:05.81 , Dec: +54:16:25.4

More information on this supernova can be found at http://www.astronomerstelegram.org/?read=3620

     I will be  monitoring and calculate its magnitude (dimness) over time. As you  can see by the graph below, from the time I started to monitor it on Aug. 30 2011  it had increased in brightness. Please note that  the smaller the magnitude number the brighter the object is.

     I will keep this graph updated by getting at least one image a night (weather permitting) till it is no longer visible.

     If you  are interested in how to convert ADU ( Analog Digital Units) values to  a Magnitude value, check out this link http://www.warren-wilson.edu/~physics/Contemp-Astronomy/starmag/starmag.html. You  will need the ADU and Magnitude numbers for a reference star  in the same field as the primary object as well as the ADU value of the object in question.  I use Nebulosity to get the ADU figures.

(This Page was last changed 06/17/2014)

These measurements were taken in the visible light without any color filters using an Orion SSP V2 on a SN8 at 5 minute exposure dark subtracted and flat applied.


These images will be updated as I get more data.



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