ROSLTL - ROSAT Long-term Timeline
The ROSLTL database is currently based on the ROSAT AO-2, AO-3, and AO-4 (part
1) long term timelines (ie numbers 800, 900, 1000, 1100, & 1200). The first was
generated by MPE in Oct 1991 and covers the interval 4 Nov 1991 to 15 Apr 1992;
the second is the AO2 extension created in April 1992, and goes up to June 15
1992. (This is not the entire AO-2 program as some observations had already
been done when this timeline was generated.) The third is the first half of the
AO-3 program covering the interval June 15 to December 7 1992. This was
generated in May/June 1992. The fourth (1100) is the second half of AO-3, made
in Nov 1992 and covering the interval 8/Dec/92 - 15/Jun/93. Finally, 1200 is
the first (PSPC) half of AO-4, made in June 1993, it covers the interval
16/Jun/93 to 20/Dec/93.
Note that accurate ROSAT orbit prediction many months ahead is not possible,
thus individual slot times at the ends of the two timelines may be
substantially revised in the short term time lines produced a week or so
before the observations.
The ROSLTL database has been made from a file provided by the UKDC. 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 switched on.
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 a 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 ROSLTL database table can be addressed to the
HEASARC User Hotline.
If you have any problems, please consult the help
page or mail email@example.com