For Scientists: The Long-Term Plan

This is the current Long-Term Plan (LTP) for IXPE. The Science Advisory Team requested that transient targets be added when and if they become bright. At such time, the LTP will be adjusted, attempting to minimize the impact on the overall plan; however, nothing is guaranteed.

IXPE is telemetry limited for bright sources and this requires that observations be handled slightly differently from the way most X-ray missions operate. If IXPE is observing a bright source that could potentially fill on-board storage, we shall divide the observation into multiple segments.

P: can be A, C, D or T. A and C targets were assigned by peer review. T is a ToO and D is DDT time. If an A target is bumped due to a ToO, it will be replaced. If a C target is bumped, it will likely be dropped from the plan.

S: This is a segment number. If segment is zero, then the observation has not been segmented.

Name: This is a common name for the target.

RA: Target RA in decimal degrees.

Dec: Target Dec in decimal degrees.

Start: The Year-Month-Day The date the observation is planned to begin. The digits after the T is the start hour, in UT, truncated to the nearest 6 hr interval.

buffer: This is an estimate as to how much data will stll be on the spacecraft when the observation ends in MB. The on-board storage can hold just over 5000 MB and when planning we keep the usage below 4000 MB.

P S Name RA Dec Start buffer
0 0recovery 0.000 0.0002024-03-27T06 0.0
T 0SWIFT J1727. 261.930 -16.2052024-04-03T06 0.0
A 0MRK 501 253.468 39.7602024-04-07T18 0.0
A 2RGB J0710+59 107.625 59.1392024-04-10T00 0.0
A 0CYG X-1 299.590 35.2022024-04-11T18 2905.8
A 3RGB J0710+59 107.625 59.1392024-04-13T00 2406.1
A 0SER X-1 279.990 5.0362024-04-14T18 2914.6
A 0V395 CAR 140.645 -63.2952024-04-15T12 1521.5
C 0GX 13+1 273.631 -17.1572024-04-20T18 2585.4
A 1NGC 4151 182.636 39.4062024-04-23T00 1232.7
A 1MRK 421 166.114 38.2092024-04-28T00 0.0
A 0CYG X-1 299.590 35.2022024-05-06T06 2905.8
A 2MRK 421 166.114 38.2092024-05-07T12 980.7
A 2NGC 4151 182.636 39.4062024-05-15T18 0.0
A 0CYG X-1 299.590 35.2022024-05-26T00 2905.8
C 0H 1426+428 217.136 42.6722024-05-27T06 2315.6
C 0PSR J1023+00 155.949 0.6452024-05-29T06 0.0
A 0CYG X-1 299.590 35.2022024-06-14T12 2905.8
C 0NGC 4945 196.365 -49.4682024-06-15T18 0.0
C 0H 1426+428 217.136 42.6722024-07-05T06 0.0
A 0MRK 501 253.468 39.7602024-07-07T12 0.0
C 13C58 31.408 64.8282024-07-09T12 0.0
A 0PSR B1259-63 195.710 -63.8042024-07-14T12 0.0
C 23C58 31.408 64.8282024-07-29T06 0.0
A 0MRK 501 253.468 39.7602024-08-09T18 0.0
Plan covers time up to the first week of Aug 2024.
ToOs will cause planned times to shift around.
+ NASA Privacy, Security, Notices | Last Updated: March 29, 2024 | Author/Curator: Mitzi Adams, mitzi.adams @