This is the current Long-Term Plan (LTP) for IXPE. IXPE is currently observing targets from GO Cycle 3.

Category A targets are guaranteed to be observed, including the following A targets carried over from the previous cycle:

Prop	Name	RA	Dec
2142	SS 433	287.9565	4.98272

The IXPE project expects to be able to observe ~50% of Category C targets. 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.

Columns:

• P: can be A, C, L, D or T. A and C targets were assigned by peer review. T is a ToO and D is DDT time. L denotes a large project. 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.
• Pnum: This is the GO proposal number. If the observation is a DDT or a calibration, then this number will be zero.
• 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 a 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 4500 MB and when planning we keep the usage below 4000 MB.

P S	Pnum	Name	RA	Dec	Start	buffer
A 4	3140	ARK 564	340.664	29.725	2026-01-01T12	0.0
D 0	0000	Cyg X-2 p08	326.188	38.310	2026-01-06T18	1638.4
A 5	3140	ARK 564	340.664	29.725	2026-01-09T06	852.0
D 0	0000	Cyg X-2 p07a	326.117	38.340	2026-01-10T18	1572.9
A 6	3140	ARK 564	340.664	29.725	2026-01-12T00	0.0
D 0	0000	Cyg X-2 p01a	326.176	38.362	2026-01-15T18	1048.6
D 0	0000	Cyg X-2 e01	326.165	38.332	2026-01-17T06	1769.4
D 0	0000	Cyg X-2 e02	326.213	38.270	2026-01-18T12	2490.3
A 7	3140	ARK 564	340.664	29.725	2026-01-19T12	1022.5
D 0	0000	Cyg X-2 p03a	326.227	38.307	2026-01-22T12	2333.2
D 0	0000	Cyg X-2 e03	326.085	38.368	2026-01-24T12	2827.8
A 8	3140	ARK 564	340.664	29.725	2026-01-25T12	1569.7
D 0	0000	Cyg X-2 e04	326.132	38.245	2026-01-28T00	2064.3
D 0	0000	Cyg X-2 e05	326.172	38.389	2026-01-29T00	2558.9
D 0	0000	Cyg X-2 e06	326.068	38.297	2026-01-30T00	3053.5
D 0	0000	Cyg X-2 e07	326.249	38.350	2026-01-30T18	3548.1
L 1	3224	MRK 501	253.468	39.760	2026-01-31T18	2525.8
L 1	3215	1E 1547.0-54	237.725	-54.307	2026-02-02T18	599.8
D 0	0000	GX 349+2	256.435	-36.417	2026-02-06T18	1729.8
L 2	3215	1E 1547.0-54	237.725	-54.307	2026-02-08T18	0.0
L 2	3224	MRK 501	253.468	39.760	2026-02-12T18	0.0
A 1	3003	LS I +61 303	40.132	61.229	2026-02-14T18	0.0
A 0	3016	CRAB PULSAR	83.633	22.014	2026-02-21T06	2271.2
L 3	3215	1E 1547.0-54	237.725	-54.307	2026-02-22T18	345.2
L 3	3224	MRK 501	253.468	39.760	2026-02-26T18	0.0
A 0	3016	CRAB PULSAR	83.633	22.014	2026-02-28T18	2271.2
L 4	3215	1E 1547.0-54	237.725	-54.307	2026-03-02T12	0.0
L 4	3224	MRK 501	253.468	39.760	2026-03-10T06	0.0
A 1	3003	LS I +61 303	40.132	61.229	2026-03-12T06	0.0
L 5	3215	1E 1547.0-54	237.725	-54.307	2026-03-18T18	0.0
L 5	3224	MRK 501	253.468	39.760	2026-03-25T12	0.0
A 0	3079	SS 433 E2	288.543	4.937	2026-03-27T18	0.0
L 6	3224	MRK 501	253.468	39.760	2026-04-07T12	0.0
A 0	3016	CRAB PULSAR	83.633	22.014	2026-04-09T18	2271.2
A 0	3250	MRK 421	166.114	38.209	2026-04-11T06	0.0
L 7	3224	MRK 501	253.468	39.760	2026-04-22T00	0.0
A 2	3261	4U 1916-053	289.698	-5.238	2026-04-24T00	0.0
L 8	3224	MRK 501	253.468	39.760	2026-05-07T12	0.0
A 0	3079	SS 433 E2	288.543	4.937	2026-05-09T18	0.0
L 9	3224	MRK 501	253.468	39.760	2026-05-20T12	0.0