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AAVSO Special Notice #203: Request for monitoring of V842 Cen in support of HST Observations AAVSO HOME > publications > special notice

AAVSO Special Notice #203

Request for monitoring of V842 Cen in support of HST Observations
March 15, 2010

Further to AAVSO Alert Notice 418, the AAVSO requests intensive
monitoring of the cataclysmic variable V842 Cen in support of Dr. Paula
Szkody's upcoming Hubble Space Telescope observations beginning now
(2010 March 15.85; JD 2455271.35) and continuing through 2010 March 19. 
Observations are requested to show HST ground controllers that the
system remains faint and is therefore safe to observe.  Telescope
operators at the Space Telescope Science Institute (STScI) will make the
decision to move forward with HST observations based upon ground-based
data from March 16 through the UT morning of Wednesday, March 17 (JD
2455273.0) at the very latest.

The field lacks a good calibration for its current brightness level.  As
stated in Alert Notice 418, visual observers may use the two stars to
the south-southwest of V842 Cen -- one 7 arcseconds distant, the other
20 arcseconds distant -- as comparisons.  The NOMAD1 ID, position, and
magnitudes for these two objects are:

7":  0323-0709135 , RA 14 35 52.170 , Dec -57 37 43.82 , V=14.88

20": 0323-0709110 , RA 14 35 51.839 , Dec -57 37 57.54 , V=14.76

CCD observers may use the "140" comparison star (AUID 000-BJT-697) as a
possible photometric comparison star.  Both visual and CCD observers
should note in their report both the identity and assumed magnitude of
any comparison stars used.  If you are uncertain as to the magnitudes,
please contact Dr. Matthew Templeton (matthewt@aavso.org) directly, and
the details of the observation will be communicated directly to Dr.
Paula Szkody.


V842 Cen is located at the following (J2000) coordinates:

        RA: 14 35 52.58 , Dec: -57 37 35.1


Charts for V842 Cen may be plotted using AAVSO VSP:

http://www.aavso.org/observing/charts/vsp/index.html?pickname=V0842%20Cen


V842 Cen is the second of two objects being observed as part of this HST
support campaign.  For more information on this campaign, please see
AAVSO Alert Notice 417:

http://www.aavso.org/publications/alerts/alert417.shtml


Please report all observations of V842 Cen to the AAVSO using the name
"V842 CEN".


This AAVSO Special Notice was prepared by Matthew Templeton.

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