LS 5039

LS 5039 is a binary system in the constellation of Scutum. It has an apparent magnitude of 11.27,[2] and it is about 8,200 light-years away.[3]

LS 5039
Observation data
Epoch J2000      Equinox J2000
Constellation Scutum
Right ascension 18h 26m 15.0568s[1]
Declination −14° 50′ 54.242″[1]
Apparent magnitude (V) 11.27[2]
Characteristics
Spectral type O(f)N6.5V + Black hole[3]
Astrometry
Radial velocity (Rv)17.2 ± 0.7[3] km/s
Proper motion (μ) RA: 6.826[1] mas/yr
Dec.: −8.515[1] mas/yr
Distance8200±300[3] ly
(2500±100[3] pc)
Orbit[3]
Period (P)3.90603 ± 0.00017 d
Eccentricity (e)0.31 ± 0.04
Inclination (i)24.9 ± 2.8°
Periastron epoch (T)HJD 2451943.09 ± 0.10
Argument of periastron (ω)
(secondary)		226 ± 8°
Semi-amplitude (K1)
(primary)		19.4 ± 0.9 km/s
Details[3]
O star
Mass22.9+3.4
−2.9 M☉
Radius9.3+0.7
−0.6 R☉
Luminosity182000 L☉
Surface gravity (log g)3.85 cgs
Temperature39000 K
Rotational velocity (v sin i)113 km/s
Black hole
Mass3.7+1.3
−1.0 M☉
RadiusProbably 10.93 km
Other designations
V479 Sct, TYC 5702-1197-1, 2MASS J18261505-1450542[4]
Database references
SIMBADdata

LS 5039 consists of a massive O-type main-sequence star, and a compact object (likely a black hole)[3] that emits HE (high energy) and VHE (very high energy) gamma rays. It is one of the only three known star systems of this kind, together with LS I +61 303 and PSR B1259-63. The two objects orbit each other every 3.9 days, along a moderately eccentric orbit.[3]

References
  1. Gaia Collaboration (2016). "Gaia Data Release 1". Astronomy & Astrophysics. 595: A2. arXiv:1609.04172. Bibcode:2016A&A...595A...2G. doi:10.1051/0004-6361/201629512. S2CID 1828208.
  2. Zacharias, N. (2012). "The fourth US Naval Observatory CCD Astrograph Catalog (UCAC4)". VizieR On-line Data Catalog. Bibcode:2012yCat.1322....0Z.
  3. Casares, J; Ribo, M; Ribas, I; Paredes, J. M; Marti, J; Herrero, A (2005). "A possible black hole in the -ray microquasar LS 5039". Monthly Notices of the Royal Astronomical Society. 364 (3): 899–908. arXiv:astro-ph/0507549. Bibcode:2005MNRAS.364..899C. doi:10.1111/j.1365-2966.2005.09617.x. S2CID 8393701.
  4. "V* V479 Sct". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2 May 2018.

See also
  • LS I +61 303, the only other known VHE gamma ray producing system


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