| A | B |
|---|---|
A visual band light curve for V4641 Sagittarii, adapted from Goranskij (2001)1 | … |
| Observation data Epoch J2000.0 Equinox ICRS | … |
| Constellation | Sagittarius |
| Right ascension | 18 19 21.634272 |
| Declination | −25° 24′ 25.8493″2 |
| Apparent magnitude (V) | 9.0 - 14.03 |
| Characteristics | … |
| Spectral type | B9III4 |
| Variable type | HMXB/BHXB/XN+ELL+E3 |
| Astrometry | … |
| Proper motion (μ) | RA: −0.7342 mas/yr Dec.: +0.4182 mas/yr |
| Parallax (π) | 0.1510±0.0413 mas2 |
| Distance | 20,200 ± 2,3004 ly |
| Orbit 4 | … |
| Period (P) | 2.81730 d |
| Semi-major axis (a) | 17.5±1.0 R |
| Inclination (i) | 72.3±4.1° |
| Periastron epoch (T) | 2452423.647 |
| Semi-amplitude (K) (secondary) | 211.3±1.0 km/s |
| Details 4 | … |
| Black hole | … |
| Mass | 6.4±0.6 M |
| Stellar companion | … |
| Mass | 2.9±0.4 M |
| Radius | 5.3±0.3 R |
| Surface gravity (log g) | 3.5±0.1 cgs |
| Temperature | 10,250±300 K |
| Rotational velocity (v sin i) | 100.9±0.8 km/s |
| Other designations | … |
| V4641 Sgr, AAVSO 1813-25B, GSC 06848-03786, 2MASS J18192163-25242585 | … |
| Database references | … |
| SIMBAD | data |
V4641 Sagittarii
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Footnotes
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Goranskij, V. P. (May 2001). “The Orbital V-band Light Curve of V4641 Sagittarii”. Information Bulletin on Variable Stars. 5068: 1. Bibcode:2001IBVS.5068…1G. Retrieved 13 March 2022. ↩
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Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). “Gaia Data Release 2: Summary of the contents and survey properties”. Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A…616A…1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR. ↩ ↩2 ↩3 ↩4 ↩5
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“V4641 Sgr”. International Variable Star Index. Retrieved 2021-03-17. ↩ ↩2
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MacDonald, Rachel K. D.; et al. (March 2014). “The Black Hole Binary V4641 Sagitarii: Activity in Quiescence and Improved Mass Determinations”. The Astrophysical Journal. 784 (1): 19. arXiv:1401.4190. Bibcode:2014ApJ…784…2M. doi:10.1088/0004-637X/784/1/2. S2CID 119279780. 2. ↩ ↩2 ↩3 ↩4
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“V4641 Sgr”. SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2021-03-16. ↩