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Special Notice #328: HST/COS observing U Gem 2013 January 30

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January 29, 2013: Further to AAVSO Alert Notice 475 ( and AAVSO Special Notice #327 (, HST/COS will be observing the dwarf nova U Gem on

                                        2013 January 30 21:31:12 - 23:36:16 UT

As said by Dr. Michael Shara, "All observations during the 24 hours leading up to, during, and after the observations will be very valuable. CCD data in U,B,V and I will be particularly appreciated." Observations are needed both to ascertain that U Gem is not in outburst at the time of the HST observations and to correlate and interpret the HST data.

Please observe U Gem and report your observations to the AAVSO International Database using the name U GEM. If you see U Gem in outburst or brightening, please report your observations immediately.

Coordinates: R.A. 07 55 05.21   Dec. +22 00 04.8  (2000.0)

Charts may be created using the AAVSO Variable Star Plotter (

This AAVSO Special Notice was compiled by Elizabeth O. Waagen.


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