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Supernova in the Whirlpool Galaxy M51 


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



     The eruption was first seen on May 31st 2011, by French amateur Amédée Riou who noticed a previously absent 14th-magnitude star in a  image of the M51 galaxy. He had compared the new image to a previous one take and decided that  it had to  be a supernova because of its blue color and the fact that  it was missing in previous images.

Shortly there after, others had also spotted the supernova among them the robotic Palomar Transient Factory and the Galaxy Zoo's supernova hunters.

Measurements take of the hydrogen gas ejected from SN2011dh indicates that  its traveling at astonishing speed of 17,600km per second.

     I am attempting to monitor and calculate its magnitude (dimness) over time. As you  can see by the graph below, from the time I started to monitor it on June 4th 2011  it had increased in brightness 'till June 7th when it started do decline in intensity a bit. 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.

I'd Like to thank the following for providing images for analysis:


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