Open Access
Table 1.
Orbital parameters of 2S 1417–624.
| Parameter | 2021 outburst a | 1999 outburst b | 1994 outburst c | |
|---|---|---|---|---|
| Pspin (s) | 17.3638 ± 0.0002 | 17.3638 ± 0.0017 | 17.544701 ± 0.000008 | – |
| Ṗspin (s d−1) | ( − 3.60 ± 0.12)×10−4 | ( − 3.55 ± 2.24)×10−4 | ( − 3.46 ± 0.56)×10−5 | – |
 (s d−2) |
– | ( − 0.2 ± 10.0)×10−6 | ( − 3.42 ± 0.47)×10−6 | – |
| ax sin i (light-seconds) | 221.4 ± 5.6 | 221.6 ± 9.6 | 207.05 ± 0.97 | 188 ± 2 |
| ω (°) | 303.6 ± 1.7 | 303.9 ± 11.2 | 298.85 ± 0.68 | 300.3 ± 0.6 |
| Tω (MJD) | 59245.74 ± 0.17 | 59245.74 ± 0.31 | 51485.059 ± 0.057 | 49713.62 ± 0.05 |
| e | 0.3996 ± 0.0099 | 0.399 ± 0.027 | 0.4169 ± 0.0033 | 0.446 ± 0.002 |
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