The ROSSTL database is based on the ROSAT short term timeline. This is
generated by MPE approximately one week in advance of observations, and is
incorporated into the database (via the UKDC) accordingly. It contains details
of all scheduled pointed observations on a one entry per slot basis, where a
"slot" is an interval of constant celestial pointing with detector HTs
The ROSAT observation request sequence number.
The ROSAT day number at the start of the slot (June 2, 1990 has RDAY = 1).
The calendar date of the start of the slot in the form YYMMDD.
The UT start time of the slot.
The UT end time of the slot.
The instrument at the focus of the XRT.
A continuation flag. Set to 1 when an ROR is complete, 0 otherwise.
The originating country of this ROR.
Wide Field Camera Zoom mode switched on?
The Solar aspect angle at the start of the slot.
The minimum earth angle at the start of the slot.
The mean angle between the sun and the spacecraft at the start of the
The total number of seconds that will have been spent on this ROR by the
end of this slot.
The type of time constraint under which the observation was scheduled, if
any; i.e., monitoring observation, phase dependant observation, coordinated
observation, or contiguous observation.
Is the atomic oxygen constraint violated?
Percentage of the slot that the spacecraft spends in the earth's shadow.
Wide Field Camera filter.
Target Right Ascension.
X pointing offset.
Y pointing offset.
XRT filter wheel position (Open, Boron or Closed). During reduced pointing
mode (RORs 171nnn) the filter may be in the open position for some fraction
of the observing slot even if the filter position is given as closed.
Number of seconds of observation in this slot.
Questions regarding the ROSSTL database table can be addressed to the
HEASARC User Hotline.
Page Author: Browse Software Development Team
Last Modified: Thursday, 18-Jul-2002 12:56:04 EDT