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THE ASTRONOMER Electronic Circular No 3679      2022 Feb 14 20.54UT
Ed:Guy M Hurst, 16,Westminster Close, Kempshott Rise,  Basingstoke,
Hants, RG22 4PP,England.Telephone/FAX(01256)471074Int:+441256471074
INTERNET: GUY@TAHQ.DEMON.CO.UK      Backup: gmh@wdcc1.bnsc.rl.ac.uk
WORLD WIDE WEB                         http://www.theastronomer.org
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V704 And In LOW STATE

Further to AAVSO ALERT 754, Dr. Anna Francesca Pala (European Space Agency,
ESAC, Spain) informs us that Target-of-Opportunity observations with the
Hubble Space Telescope have been scheduled for the VY Scl novalike
cataclysmic variable V704 And, which has gone into its low state.

HST will observe V704 And on February 22, 2022.
Dr. Pala writes to the AAVSO observers: "It would be great if you could give
the highest priority to the observations of V704 And and try to obtain at
least one positive measurement [ideally in V or CV] per night, till Feb
23rd. These data will be used to confirm that the HST observations will
indeed be obtained while the target is still in low state and it is safe to
be observed with COS."
A minimum SNR~20 is recommended. If the target is too faint to obtain the
minimum SNR in V, switch to CV. As always with HST observations, a positive
observation 24 hours before the scheduled observing time is required by the
HST scheduling team to make a go/no-go decision. When the exact time of the
observations is known, it will be posted in the forum threads above.
If time-series observations are made, 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).

It will also be valuable to know when V704 And returns to its bright state,
so ongoing nightly observations a few times per week would be appreciated
until the target has returned to its bright state.

Coordinates (2000.0): R.A. 23 44 57.51  Dec. +43 31 22.3 (from Range: 12.6 -
19.5 CV

AAVSO ALERT 769


Guy M Hurst
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