30 Arietis
30 Arietis (abbreviated 30 Ari) is a 6th-apparent-magnitude multiple star system in the constellation of Aries. 30 Arietis is the Flamsteed designation. 30 Arietis A and B are separated by 38.1″ or about 1,500 AU at a distance of 130 light years away. The main components of both systems are both binaries with a composite spectra belonging to F-type main-sequence stars, meaning they are fusing hydrogen in their cores. The 30 Arietis system is 910 million years old, one fifth the age of the Sun.
30 Arietis star system hierarchy | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Aries |
| 30 Arietis A | |
| Right ascension | 02h 37m 00.5235s |
| Declination | +24° 38′ 49.9880″ |
| 30 Arietis B | |
| Right ascension | 02h 36m 57.7449s |
| Declination | +24° 38′ 53.0026″ |
| Characteristics | |
| Spectral type | F5 V / F6 V |
| B−V color index | 0.410 / 0.510 |
| Astrometry | |
| 30 Arietis A | |
| Proper motion (μ) | RA: 136.862±0.137 mas/yr Dec.: −15.188±0.141 mas/yr |
| Parallax (π) | 22.1261 ± 0.0726 mas |
| Distance | 147.4 ± 0.5 ly (45.2 ± 0.1 pc) |
| 30 Arietis B | |
| Proper motion (μ) | RA: 141.411±0.083 mas/yr Dec.: −10.677±0.086 mas/yr |
| Parallax (π) | 22.3641 ± 0.0516 mas |
| Distance | 145.8 ± 0.3 ly (44.7 ± 0.1 pc) |
| Orbit | |
| Primary | 30 Arietis A |
| Companion | 30 Arietis BC |
| Period (P) | 34000 yr |
| Semi-major axis (a) | 40" (1670 AU) |
| Orbit | |
| Primary | 30 Arietis B |
| Companion | 30 Arietis C |
| Period (P) | 80 yr |
| Semi-major axis (a) | 22.3 AU |
| Orbit | |
| Primary | 30 Arietis B |
| Companion | 30 Arietis Bb |
| Period (P) | 335.1 ± 2.5 d (0.917 ± 0.007 yr) |
| Semi-major axis (a) | 0.995 ± 0.012 AU |
| Eccentricity (e) | 0.289 ± 0.092 |
| Inclination (i) | 4.14+0.96 −0.90°° |
| Details | |
| 30 Arietis A | |
| Mass | 1.31 ± 0.04 M☉ |
| Radius | 1.37 ± 0.03 R☉ |
| Age | 860±630 Myr |
| 30 Arietis Ba | |
| Mass | 1.16 ± 0.04 M☉ |
| Radius | 1.13 ± 0.03 R☉ |
| Age | 910±830 Myr |
| Details | |
| 30 Arietis Bb | |
| Mass | 147+41 −29 MJup |
| Other designations | |
| Database references | |
| SIMBAD | A |
| B | |
| Exoplanet Archive | data |
| Data sources: | |
| Hipparcos Catalogue, CCDM (2002), Bright Star Catalogue (5th rev. ed.) | |
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