GX 304-1
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Other names : 4U 1258-61 (SIMBAD)
Monitoring data: Swift/BAT MAXI Fermi/GBM pulsed flux Fermi/GBM occultation
Historical: RXTE/ASM
Coordinates
RA 13h 01‘ 17.10“ DEC -61° 36‘ 13.16“
Binary system
Distance: 2.4±05 kpc ([1])
Orbit
Early determination by [2]: Porb = 132.5d with other parameters unknown.
The MAXI team redetermined the period from X-ray activity as Porb = 132.2d (MAXI News)
[3] have determined the orbital ephemeris in detail, but with two separate solutions, depending on the assumed connection between spin changes and luminosity. Both solutions use as orbital period Porb = 132.189 ± 0.02d and find the eccentricity around 0.5.
Pulsations
Pulse period: 275.5s
X-ray Spectrum
Cyclotron Features
Optical Companion
Type : B2 Vne star ([6])
| Parameter | Value | Unit | Reference |
|---|---|---|---|
| B | 15.6 | SIMBAD | |
| V | 13.40 | SIMBAD |
References
- ↑ Cite error: Invalid
<ref>tag; no text was provided for refs namedParkes80 - ↑ Cite error: Invalid
<ref>tag; no text was provided for refs namedPriedhorsky83 - ↑ Cite error: Invalid
<ref>tag; no text was provided for refs namedSugizaki15 - ↑ Cite error: Invalid
<ref>tag; no text was provided for refs namedYamamoto11 - ↑ Cite error: Invalid
<ref>tag; no text was provided for refs namedKlochkov12 - ↑ Cite error: Invalid
<ref>tag; no text was provided for refs namedMason78