Skip to main content

Web Publications

AAVSO Special Notice #79: Update of Alert Notice 361: HST Observations of SDSS091908 AAVSO HOME > publications > special notice

AAVSO Special Notice #79

Update of Alert Notice 361: HST Observations of SDSS091908
November 12, 2007

This is an update to the Request for Observations given in Alert Notice
361, on upcoming Hubble Space Telescope observations of SDSS091908, a
cataclysmic variable with a pulsating white dwarf primary.

We are currently 36 hours prior to the STScI decision on whether it is
safe to observe this CV or not.  To make this decision, they require
that the target be fainter than approximately V = 14.0.  The
PI, Dr. Paula Szkody, requests intensive coverage of this CV from
observers world-wide to assure that HST mission controllers have the
information they need to approve observations.  Observers are requested
to observe SDSS091908 (SDSS J091945.11+085710.0; AAVSO designation
0914+09) as often as possible between now (2007 Nov 12 21:20 UT, JD
2454417.39) and the decision time (2007 November 14 09:46 UT, approx. JD

Full details of the requested observation procedure are given in the
Alert Notice, available here:

SDSS091908 is located at RA 09:19:45:11 , Dec +08:57:10.0 (J2000).

A chart for this object may be generated here:

Please report all observations to the AAVSO as "SDSS091908" (AAVSO
designation 0914+09).  Observations are time-critical, so please report
all observations as quickly as you are able to do so.

This AAVSO Special Notice was prepared by Matthew Templeton.


Information on submitting observations to the AAVSO may be found at:


A Special Notice archive is available at the following URL:

Subscribing and Unsubscribing may be done at the following URL:

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