V1054 Ophiuchi
An ultraviolet band light curve for a flare on V1054 Ophiuchi, plotted from data published by Dal and Evren (2010) | |
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Ophiuchus |
| AB | |
| Right ascension | 16h 55m 28.75757s |
| Declination | −08° 20′ 10.7878″ |
| Apparent magnitude (V) | 9.74/10.34/10.84 |
| Gliese 643 | |
| Right ascension | 16h 55m 25.22225s |
| Declination | −08° 19′ 21.2970″ |
| Apparent magnitude (V) | 11.74 |
| C (VB 8) | |
| Right ascension | 16h 55m 35.25574s |
| Declination | −08° 23′ 40.7531″ |
| Apparent magnitude (V) | 16.80 |
| Characteristics | |
| AB | |
| Spectral type | M3 V / M4 Ve |
| Gliese 643 | |
| Spectral type | M3.5 V |
| C (VB 8) | |
| Spectral type | M7.0 V |
| Astrometry | |
| AB | |
| Radial velocity (Rv) | 14.89±0.05 km/s |
| Proper motion (μ) | RA: −817.84±6.68 mas/yr Dec.: −873.53±3.53 mas/yr |
| Parallax (π) | 161.41±5.64 mas |
| Distance | 20.2 ± 0.7 ly (6.2 ± 0.2 pc) |
| Absolute magnitude (MV) | 10.23 |
| Gliese 643 | |
| Radial velocity (Rv) | 15.20±0.15 km/s |
| Proper motion (μ) | RA: −817.580(52) mas/yr Dec.: −898.595(40) mas/yr |
| Parallax (π) | 153.8754±0.0474 mas |
| Distance | 21.196 ± 0.007 ly (6.499 ± 0.002 pc) |
| Absolute magnitude (MV) | 12.60 |
| VB 8 | |
| Proper motion (μ) | RA: −813.038(63) mas/yr Dec.: −870.609(44) mas/yr |
| Parallax (π) | 153.9659 ± 0.0570 mas |
| Distance | 21.184 ± 0.008 ly (6.495 ± 0.002 pc) |
| Absolute magnitude (MV) | 17.75 |
| Orbit | |
| Primary | V1054 Oph A |
| Companion | V1054 Oph B |
| Period (P) | 1.717267±0.000039 yr |
| Semi-major axis (a) | 0.2273±0.0004" (1.46683 AU) |
| 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 | |
| Primary | V1054 Oph Ba |
| Companion | V1054 Oph Bb |
| Period (P) | 2.965509±0.000006 d |
| Semi-major axis (a) | 0.00687" (0.04432 AU) |
| 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 | |
| AB | |
| Mass | 0.4155±0.0057 / 0.3466±0.0047 / 0.3143±0.0040 M☉ |
| Gliese 643 | |
| Mass | 0.19 M☉ |
| C (VB 8) | |
| Mass | 0.0914+0.0026 −0.0025 M☉ |
| Radius | 0.1214+0.0060 −0.0057 R☉ |
| Luminosity | 0.000645+0.000004 −0.000005 L☉ |
| Temperature | 2,640+65 −64 K |
| Rotation | 11.19±0.02 days |
| Other designations | |
| CCDM J16555-0820 | |
| AB: V1054 Oph, BD−08°4352, GJ 644, HD 152751, HIP 82817, SAO 141439, LHS 428, Wolf 630 | |
| GJ 643: GJ 643, HIP 82809, LHS 427, Wolf 629 | |
| C: GJ 644 C, LHS 429, VB 8 | |
| Database references | |
| SIMBAD | ABab |
| GJ 643 | |
| C (vB 8) | |
V1054 Ophiuchi, together with the star Gliese 643, is a nearby quintuple star system, located in the constellation Ophiuchus at a distance of 21.2 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.