AAVSO Special Notice #69: Update on AN 358 Mira monitoring campaign

As announced in AAVSO Alert Notice 358, we are approaching the scheduled
HST observing time for omi Cet (AAVSO 0214-03).  Observations are currently
planned for 2007 September 23, 19:00-23:30 UT.  Dr. Margarita Karovska
(CfA) and collaborators are using HST to observe Mira AB and study the
behavior of the mass flow and mass transfer within this system.  Optical
observations -- visual and instrumental -- are requested for this
campaign.

CCD observers may now use an updated Henden sequence that has been added
to the AAVSO's Variable Star Plotter.  Charts suitable for CCD observers
are available here:

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

As stated in the Alert Notice, Mira A and B (omi Cet and VZ Ceti, 
respectively) will be severely blended in most telescopes, and PSF
photometry will likely not resolve the two.  Please use an aperture 
which includes both stars.

The text of Alert Notice 358 which contains observing instructions is
available here:

http://www.aavso.org/publications/alerts/alert358.shtml

Information about the planned HST observations is available here:

http://www.stsci.edu/observing/phase2-public/11224.pdf

Omi Cet is located at RA=02:19:20.7927, Dec=-02:58:39.513 (J2000). 
Please report all observations to the AAVSO as "OMI CET" (designation
0214-03).

This Special Notice was composed by Dr. Matthew Templeton (AAVSO).

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