Skip to main content

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

The membership database is currently undergoing upgrading/testing. Web functions that involve an interface with the member database (webobs, etc.) may experience intermittent problems. We hope to have this issue resolved within 24 hours (by 5pm Eastern Time on October 1st or 12:00 UT). Thank you for your patience.

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.


Information on submitting observations to the AAVSO may be found at:


A Special Notice archive is available at the following URL:

Subscribing and Unsubscribing may be done at the following URL:

AAVSO 49 Bay State Rd. Cambridge, MA 02138 617-354-0484