SAX J1808.4−3658
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Observation data ICRS )
| |
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Constellation | Sagittarius |
Right ascension | 17h 45m 39.73s[1] |
Declination | −29° 00′ 29.7″[1] |
Apparent magnitude (V) | 16.51 |
Spectral type | Neutron star |
V4580 Sgr, PSR J1808−3658, SWIFT J1808.5−3655, INTREF 881, XTE J1808−369 | |
Database references | |
SIMBAD | data |
The first accreting millisecond pulsar discovered in 1998 by the Italian-Dutch
low-mass X-ray binaries
.
These accreting millisecond X-ray pulsars are thought to be the evolutionary progenitors of recycled radio millisecond pulsars. A total of thirteen accreting millisecond X-ray pulsars have been discovered as of January 2011. Three of them are Intermittent millisecond X-ray pulsars (HETE J1900.1-2455, Aql X-1 and SAX J1748.9-2021), i.e. they emit pulsations sporadically during the outburst.
On 21 August 2019 (UTC; 20 August in the US), Neutron Star Interior Composition Explorer (NICER) spotted the brightest X-ray burst so far observed.[4] It came from SAX J1808.4−3658.
References
- ^ a b "SAX J1808.4-3658". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 15 January 2017.
- S2CID 4428048.
- .
- ^ NICER Telescope Spots Brightest X-Ray Burst Ever Observed