HST/COS Observations CANCELLED for SDSS J154453.60+255348.8

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HST/COS Observations CANCELLED for SDSS J154453.60+255348.8

文章 PTS » 週三 01 5月, 2013 06:20

AAVSO Special Notice #349

HST/COS Observations CANCELLED for SDSS J154453.60+255348.8
April 30, 2013

Further to AAVSO Alert Notice 471
(http://www.aavso.org/aavso-alert-notice-471) and AAVSO Special
Notice 348 (http://www.aavso.org/aavso-special-notice-348), HST/COS
was scheduled to observe the eclipsing dwarf nova
SDSS J154453.60+255348.8 tonight:

SDSS J154453.60+255348.8 2013 May 1 04:06:20 through 08:17:24 UT

HOWEVER, THESE OBSERVATIONS HAVE BEEN CANCELLED. PI Dr. Boris
Gaensicke writes, "We had a telecon with STScI a few hours ago,
and due to the recent brightening, and the relatively poor knowledge
regarding the long-term light curve and the variability in the UV
wavelengths, we all concluded that it will be better to err on
the safe side. Sigh... But then, we managed to get 25 observations
done safely, and with the unpredictable behaviour of CVs, it
had to happen sooner or later."

Even though the HST observations have been cancelled, please
continue to observe SDSS J154453.60+255348.8 nightly until the
outburst is over to further our understanding of this system.
The system continues in outburst at V~15.8-17.5, according to
observations reported to the AAVSO International Database by
eight observers. SDSS J154453.60+255348.8 is V=<18 at minimum and
can be as bright as V=15.7 at maximum.

There is a possibility that this system may be rescheduled for
observation by HST/COS later in the program, but that decision
will not be made for a few months.

Coordinates (2000.0)
SDSS J154453.60+255348.8 R.A. 15 44 53.60 Dec. +25 53 48.9

Charts may be created using the AAVSO Variable Star Plotter
(http://www.aavso.org/vsp).

Please report observations as soon as possible to the AAVSO
International Database using the name SDSS J154453.60+255348.8.
Many thanks!

This AAVSO Special Notice was compiled by Elizabeth O. Waagen.


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