Skip to main content

VY Scl

Special Notice #75: Monitoring of TT Ari in support of MOST observations

October 22, 2007: The Microvariability and Oscillations of Stars (MOST) Satellite will conduct a targeted photometric observing campaign on the cataclysmic variable TT Ari, beginning 2007 October 23 UT (JD 2454397) and concluding on 2007 October 28 (JD 2454402). This observing program was proposed by a group of Austrian amateur astronomers who proposed to the "MOST fuer Alle" program of the University of Vienna, the Austrian partner project of the MOST collaboration's "My Own Space Telescope" program for Canadian observers.

Special Notice #132: Update of Alert Notice 389 - Spectroscopic observations of VY Scl

November 17, 2008

Special Notice #404: V380 Oph in low state

July 10, 2015:  The novalike/VY Scl variable V380 Oph is in its low state and is undergoing a deep fading, according to observations by Adolfo Darriba Martinez on 2015 July 4 and 5 reported via VSNET, CBA, and to the AAVSO International Database.

Special Notice #362: OR And and AX For obs critical now

July 8, 2013: The VY Scl variable OR And continues in its low state, so it has been scheduled for HST/COS observations. Based on your observations, the HST/COS team will be making the final decision tomorrow morning (2013 July 9) whether to observe OR And on:

OR And 2013 July 10 11:47:01 through 15:56:12 UT

OR And is ~18V in its low state and ~14.5V in its high state.

HST/COS is scheduled to observe the SU UMa variable AX For on the next day:

Special Notice #359: OR And monitoring needed for HST/COS campaign

June 12, 2013: Among the research options in the HST/COS CV campaign underway are observing two VY Scl stars in the low state, the only time the white dwarf is observable. OR And is now in its low state, at 18th V magnitude as of 2013 June 11 UT.

Special Notice #330: Next HST/COS targets are IR Com and BB Dor

February 2, 2013:  Further to AAVSO Alert Notice 471 (, the next HST/COS target is the SU UMa-type dwarf nova IR Com. HST/COS observations are scheduled for:

     IR Com   2013 February 8 00:38:46 through 05:57:49 UT

IR Com is an eclipsing SU UMa-type dwarf nova. According to observations in the AAVSO International Database, it reaches V magnitude 18-19 at minimum. IR Com can be as bright as 13.5 V at maximum.


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