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HST

Alert Notice 551: GDS_J1701281-430612 monitoring for HST observations

September 20, 2016: Dr. Mark Reynolds (University of Michigan) and colleagues have requested AAVSO assistance in monitoring the cataclysmic variable GDS_J1701281-430612 in support of HST/COS observations scheduled for early October.

Special Notice 410: Upcoming HST observations of V5668 Sgr

Note: this text is slightly different than the emailed version.  No technical information was changed.

Alert Notice 533: Coverage of V5668 Sgr (Nova Sgr 2015 No. 2) requested in support of HST spectroscopy

October 30, 2015: Dr. Peter Kuin (Mullard Space Science Laboratory, University College London) and colleagues in the Swift Nova group have requested AAVSO observers' assistance in multicolor monitoring of V5668 Sgr (Nova Sgr 2015 No. 2, see AAVSO Alert Notices 512, 519) in support of an upcoming spectroscopic observation with the Hubble Space Telescope Imaging Spectrograph (STIS).

Alert Notice 526: Monitoring of LS IV -14 116 in support of upcoming satellite observations

August 20, 2015Prof. Simon Jeffery (Armagh Observatory; Trinity College Dublin) has requested photometric monitoring of the pulsating helium and zirconium-rich hot subdwarf LS IV -14 116 in support of upcoming HST and VLT/UVES spectroscopy. AAVSO observations will supplement photometry due to be obtained with the SAAO 1.0-m and IAC 0.8-m telescopes from 18 August to 2 September 2015. Photometry is requested beginning immediately through 2 September.

Alert Notice 522: V404 Cyg HST multiwavelength observations scheduled

Correction: In the text below, the date of the detection by the Swift satellite was incorrectly given as 2015 June 16.77197 UT. The correct date is 2015 June 15.77197 UT.

Our sincere apologies for this error!

July 1, 2015:

Special Notice #403: GW Lib HST schedule set

April 16, 2015: Further to AAVSO Alert Notice 513, Dr. Paula Szkody (University of Washington) informs us that the HST observations for the cataclysmic variable GW Lib have been scheduled for

2015 April 22 04:04:36 - 09:00:06 UT.

Alert Notice 513: Request for observations of GW Lib in support of HST observations

March 18, 2015: Dr. Paula Szkody, University of Washington, has requested our help in monitoring the cataclysmic variable GW Lib for upcoming Hubble Space Telescope observations, scheduled to be made during the window 2015 April 22-25 UT. Dr. Szkody also observed this object with HST in March 2011 and March 2010 (see AAVSO Alert Notices 433 and 417, respectively).

Special Notice #199: Request for monitoring of GW Lib in support of HST Observations

March 8, 2010: Further to Alert Notice 417, the AAVSO requests intensive monitoring observations of the cataclysmic variable GW Librae beginning immediately (2010 March 9.0 UT; JD 2455264.5) and continuing through 2010 March 12.5 (2455268.0). These observations are in support of the Hubble Space Telescope Cosmic Origins Spectrograph observations of GW Lib planned for 2010 March 11 UT. Space Telescope ground controllers will need to know that GW Lib is fainter than V=15 in order to proceed with the planned observations.

Special Notice #209: Nightly monitoring of TW Hya in support of HST observations

May 17, 2010: Dr. Michael Sitko (U. Cincinnati) requests observations of the young stellar object TW Hya in support of upcoming Hubble Space Telescope observations. TW Hya is believed to be a T Tauri star that varies between magnitudes 10.5 and 12.2. TW Hya will be observed with the HST STIS instrument as part of a larger program to study the properties of potentially planet-forming disks around young stars. The star will be observed in the ultraviolet to search for time-variability in the gas in the inner accretion disk.

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