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ROSLTL: Help

ROSLTL - ROSAT Long-term Timeline

Overview

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.


Parameters

Ror
The ROSAT observation request sequence number.

Rday
The ROSAT day number at the start of the slot (June 2, 1990 has RDAY = 1).

Day
The calendar date of the start of the slot in the form YYMMDD.

Start
The UT start time of the slot.

End
The UT end time of the slot.

Instr
The instrument at the focus of the XRT.

Cont
A continuation flag. Set to 1 when a ROR is complete, 0 otherwise.

Country
The originating country of this ROR.

Zoom
Wide Field Camera Zoom mode switched on?

Solar_Ang
The Solar aspect angle at the start of the slot.

Earth_Ang
The minimum earth angle at the start of the slot.

Sun_Ang
The mean angle between the sun and the spacecraft at the start of the 
slot.

Elapsed
The total number of seconds that will have been spent on this ROR by the 
end of this slot.

Constraint
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.

Aox
Is the atomic oxygen constraint violated?

Night
Percentage of the slot that the spacecraft spends in the earth's shadow.

Wfilt
Wide Field Camera filter.

RA
Target Right Ascension.

Dec
Target Declination.

Xoff
X pointing offset.

Yoff
Y pointing offset.

Xfilt
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.

Duration
Number of seconds of observation in this slot.  

PI_Number
PI Number.

Target_Number
Target Number

PI
PI name.

Name
Target Name.

Contact Person

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 ledas-help@star.le.ac.uk
 
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