V1054 Ophiuchi
Star system in the constellation Ophiuchus / From Wikipedia, the free encyclopedia
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V1054 Ophiuchi, together with the star Gliese 643, is a nearby quintuple star system. In the constellation Ophiuchus at a distance of 21.19 light-years. It consists of five stars, all of which are red dwarfs. The alternative designation of Wolf 630 forms the namesake of a moving group of stars that share a similar motion through space.[8]
Quick Facts Constellation, Right ascension ...
An ultraviolet band light curve for a flare on V1054 Ophiuchi, plotted from data published by Dal and Evren (2010)[1] | |
Observation data Epoch J2000.0 Equinox J2000.0 | |
---|---|
Constellation | Ophiuchus |
Right ascension | 16h 55m 25.2222456607s[2] |
Declination | −08° 19′ 21.296969682″[2] |
Apparent magnitude (V) | 9.74/10.34/10.84/11.74/16.80[3] |
Characteristics | |
Spectral type | M3 V[4] / M4 Ve[note 1] / M3.5 V[4] / M7.0 V[3] |
Astrometry | |
Proper motion (μ) | RA: −817.580±0.052[2] mas/yr Dec.: −898.595±0.040[2] mas/yr |
Parallax (π) | 153.8754 ± 0.0474 mas[2] |
Distance | 21.196 ± 0.007 ly (6.499 ± 0.002 pc) |
Absolute magnitude (MV) | 10.69±0.02 / 11.29±0.05 / 11.79±0.05 / 12.69[3][note 2] |
VB 8 | |
Proper motion (μ) | RA: −813.038±0.063[5] mas/yr Dec.: −870.609±0.044[5] mas/yr |
Parallax (π) | 153.9659 ± 0.0570 mas[5] |
Distance | 21.184 ± 0.008 ly (6.495 ± 0.002 pc) |
Absolute magnitude (MV) | 17.75[3] |
Orbit[4] | |
Primary | V1054 Oph A |
Companion | V1054 Oph B |
Period (P) | 1.717267±0.000039[3] yr |
Semi-major axis (a) | 0.2273±0.0004" (1.46683 AU[note 3]) |
Eccentricity (e) | 0.042±0.001 |
Inclination (i) | 160.3±0.1° |
Longitude of the node (Ω) | −10.2±0.2° |
Periastron epoch (T) | MJD 53943±3 |
Argument of periastron (ω) (secondary) | 306.0±1.5° |
Orbit[4] | |
Primary | V1054 Oph Ba |
Companion | V1054 Oph Bb |
Period (P) | 2.965509±0.000006 d |
Semi-major axis (a) | 0.00687[note 4]" (0.04432 AU[note 5]) |
Eccentricity (e) | 0.0209±0.0008 |
Inclination (i) | 164.18±0.08° |
Periastron epoch (T) | MJD 50919.48±0.03 |
Argument of periastron (ω) (secondary) | 150.0±3.0° |
Details | |
V1054 Oph AB | |
Mass | 0.4155±0.0057 / 0.3466±0.0047 / 0.3143±0.0040[4] M☉ |
Gliese 643 | |
Mass | 0.19[3] M☉ |
Details | |
VB 8 | |
Mass | 0.0914+0.0026 −0.0025[6] M☉ |
Radius | 0.1214+0.0060 −0.0057[6] R☉ |
Luminosity | 0.000645+0.000004 −0.000005[6] L☉ |
Temperature | 2,640+65 −64[6] K |
Other designations | |
Database references | |
SIMBAD | The system |
ABab | |
A | |
Bab | |
GJ 643 | |
C (vB 8) | |
vB 8B (artifact) |
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