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AAVSO Special Notice #179: Request for observations of TT Ari in support of GALEX observations AAVSO HOME > publications > special notice

AAVSO Special Notice #179

Request for observations of TT Ari in support of GALEX observations
November 16, 2009

Further to Alert Notice 408 (2009 October 13), we are updating the initial
request for observations of the cataclysmic variable TT Arietis to obtain
time-series photometry in conjunction with ultraviolet observations by
the GALEX satellite.  These observations were initiated by Dr. Joseph
Patterson (Columbia U. and Center for Backyard Astrophysics) and are 
scheduled to continue through 2009 November 27.  These observations will
occur daily on the schedule listed below.  Time-series observations are
strongly encouraged during the expected times of the spacecraft 

TT Ari remains in its low state, and is still exhibiting very large
amplitude oscillations with timescales of minutes to hours.  The star
varies between roughly V=16.5 and V=14.5, and the oscillations are rapid.
Good signal-to-noise with high time-resolution are the key requirements;
filters should only used if you have sufficient aperture to obtain good
signal to noise with exposures of 5 minutes or less.

The scheduled GALEX observations are as follows.  GALEX exposures are
approximately 30 minutes long starting at the UT indicated; please 
observe for at least 30 minutes on either side of the window if 

        2009 November 17 05:32:26.8 UT (JD 2455152.7309)
        2009 November 17 07:11:00.9 UT (JD 2455152.7993)
        2009 November 18 04:32:25.0 UT (JD 2455153.6892)
        2009 November 18 06:10:59.2 UT (JD 2455153.7576)
        2009 November 19 05:10:58.8 UT (JD 2455154.7160)
        2009 November 19 06:49:33.1 UT (JD 2455154.7844)
        2009 November 20 05:49:34.5 UT (JD 2455155.7428)
        2009 November 20 07:28:09.0 UT (JD 2455155.8112)

Additional observations have not yet been scheduled.

For more information on these observations, please see the CBA website:

The AAVSO is also maintaining a web page on TT Ari's current activity:

TT Ari is located at the following (J2000) coordinates:

        RA: 02:06:53.10 , Dec: +15:17:42.0

Charts for TT Ari may be plotted with AAVSO VSP:

Please promptly submit all observations to the AAVSO with the name

This AAVSO Special Notice was prepared by M. Templeton.


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


A Special Notice archive is available at the following URL:

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