January 13, 2022
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Further to AAVSO Alert Notice 764, Dr. Anna Francesca Pala (European Space Agency, ESAC, Spain) informs us that the Hubble Space Telescope observations of the cataclysmic variable GP Com have been moved forward to January 18, 2022.
Coverage is requested from now through February 12, 2022. Please observe GP Com a few times per night through January 18, then nightly through February 12. As with all targets for HST, it will be crucial to have a positive V measurement 24 hours before the scheduled HST time so the HST team can make a go-nogo decision.
A minimum SNR~20 is requested. If the target is too faint to obtain the minimum SNR in V, switch to CV. If a target is observed going into outburst, please submit your observation(s) as soon as possible and begin obtaining multiple observations per night.
Dr. Pala writes: "We know that some observers carry out time-series observations and also spectroscopy, and we welcome any additional contributions. Nonetheless the monitoring to assess quiescence should have the highest priority since, without it, there is the risk to lose the allocated orbits.
"In case of time-series observations, an uninterrupted light curve in a single filter (preferably B or V) would be better than alternating with different filters. CV observations can still be useful but V-filter observations should be the priority (whenever possible).
"DSLR observations, particularly if they are transformed to V, will be useful and are welcome. Visual observations will also be very valuable."
Coordinates for GP Com (2000.0): R.A. 13 05 42.40 Dec. +18 01 03.8
Range: 15.7 - 16.2 V
Variability Type: IBWD
Charts with comparison stars for GP Com may be created using the AAVSO Variable Star Plotter (VSP).
Please submit observations using the name GP COM to the AAVSO International Database.
This AAVSO Alert Notice was compiled by Elizabeth O. Waagen using material provided by Dr. Pala.
SUBMIT OBSERVATIONS TO THE AAVSO
Information on submitting observations to the AAVSO may be found at:
- Photometry/visual observations: https://www.aavso.org/webobs
- Spectroscopy: https://www.aavso.org/apps/avspec/
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