4U 1538-52 History from Oct 29, 2022 to Nov 21, 2025
4U 1538-52 Full History
The most recent pulse profile quick look:
4U 1538-52_Profile
New Fits Version of Full History (Beta version):
4U 1538-52
Old Fits Version of Full History: 4U 1538-52
4U 1538-52
The parameters below are used for this source in the GBM epoch-folding monitor
| Source Monitor Parameters
|
|---|
| RA |
235.5971 deg |
| Decl |
-52.3861 deg |
| Orbital Parameters
|
|---|
| Orbital Period |
3.7283749 days |
| Period Deriv. |
0.0000E+00 days/day |
| Tπ/2 |
2451442.48900 (JED)
| | axsin(i) |
56.600 light-sec |
| Long. of periastron |
64.00 deg |
| Eccentricity |
0.1740 |
| Egress |
0.08 |
| Ingress |
0.92 |
Notes:
Orbit elements from Clark, 2000, ApJ, 542, L131, with corrected epoch
and orbital period.
Eclipse phases from Rubin et al. 1997.
Modification date:
21 Nov, 2025
