HX Com = CSS_J121518.6+142741

HX Com = CSS_J121518.6+142741

The Catalina Sky Survey recently released a database of millions of stars observed over their course of monitoring the sky for seven years.

During a the course of searching for variables via SNHunt which as a project based upon the Catalina Sky Survey (or Catalina Real-Time Transient Survey) I have seen a number of variables. Many are probably previously unknown ones.

Above is a screen capture for one of the variables seen. This turns out to be the known variable HX Com. I immediately recognized the light-curve as resembling an RR Lyrae variable. Sure enough, HX Com is classified as an RR Lyrae variable. However, I could not find any mention of its period. According to the CSS data, the most likely period is 0.617447 days.

The website for the data release is nesssi.cacr.caltech.edu/DataRelease/

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Uploaded on Jan 31, 2012

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SN 2011iy in NGC 4984  January 28, 2012

SN 2011iy in NGC 4984 January 28, 2012

comparison stars:
APASS 197.295543-15.501531 = 14.299V
APASS 197.310277-15.587042 = 15.321V

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Uploaded on Jan 28, 2012

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SN 2011jh in NGC 4682  January 28, 2012

SN 2011jh in NGC 4682 January 28, 2012

Imaged this around 4:30AM. Frost had started forming on the corrector plate.

Comparison stars:
SDSS J124706.66-100429.2 = 15.67V
SDSS J124730.00-100447.2 = 16.34V

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Uploaded on Jan 28, 2012

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SN 2011fh in NGC 4806 January 28, 2012

SN 2011fh in NGC 4806 January 28, 2012

Finally was able to image this supernova that could have been my discovery. I had found it in the CRTS SNHunt images nearly a year ago and some six months prior to Berto Monard's official discovery. Unfortunately, it got misclassified as a variable QSO shining through the galaxy. Thus it was never officially reported. This is unfortunate as this supernova was not studied for that six months until it underwent an outburst of some two to three magnitudes at Monard's discovery.

Comparison stars:
APASS 193.976996-29.529925 = 16.472V
APASS 193.992144-29.617615 = 16.338V

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Uploaded on Jan 28, 2012

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SN 2011dh in M51  January 28, 2012

SN 2011dh in M51 January 28, 2012

The supernova has faded so much it is difficult to identify. Believe I have the correct object.

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Uploaded on Jan 28, 2012

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