30 Arietis
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Aries |
| 30 Arietis A | |
| Right ascension | 02h 37m 00.5235s |
| Declination | +24° 38′ 49.990″ |
| Apparent magnitude (V) | 6.50 |
| 30 Arietis B | |
| Right ascension | 02h 36m 57.7454s |
| Declination | +24° 38′ 53.000″ |
| Apparent magnitude (V) | 7.09 |
| Characteristics | |
| Spectral type | F5 V / F6 V |
| B−V color index | 0.410 / 0.510 |
| Astrometry | |
| 30 Arietis A | |
| Radial velocity (Rv) | +24.71±7.77 km/s |
| Proper motion (μ) | RA: +136.866 mas/yr Dec.: −15.349 mas/yr |
| Parallax (π) | 22.2608±0.0309 mas |
| Distance | 146.5 ± 0.2 ly (44.92 ± 0.06 pc) |
| 30 Arietis B | |
| Radial velocity (Rv) | +12.38±0.31 km/s |
| Proper motion (μ) | RA: +140.951 mas/yr Dec.: −10.536 mas/yr |
| Parallax (π) | 22.5107±0.0315 mas |
| Distance | 144.9 ± 0.2 ly (44.42 ± 0.06 pc) |
| Orbit | |
| Primary | 30 Arietis A |
| Name | 30 Arietis BC |
| Period (P) | 34000 yr |
| Semi-major axis (a) | 40" (1670 AU) |
| Orbit | |
| Primary | 30 Arietis B |
| Name | 30 Arietis C |
| Period (P) | 80 yr |
| Semi-major axis (a) | 22.3 AU |
| Orbit | |
| Primary | 30 Arietis B |
| Name | 30 Arietis Bb |
| Period (P) | 339.7+0.3 −0.2 d (0.930±0.001 yr) |
| Semi-major axis (a) | 1.05±0.01 AU |
| Eccentricity (e) | 0.45±0.04 |
| Inclination (i) | 2.9±0.3° |
| Longitude of the node (Ω) | 39.0+6.4 −6.3° |
| Periastron epoch (T) | 2458000.5+13.6 −16.0 BJD |
| Argument of periastron (ω) (secondary) | 354+8 −9° |
| Semi-amplitude (K1) (primary) | 281+27 −25 km/s |
| 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 |
| 30 Arietis Bb | |
| Mass | 188.1+19.7 −18.5 MJup |
| Other designations | |
| CCDM 02370+2439, WDS 02370+2439 | |
| 30 Arietis A: BD+24°376, HD 16246, HIP 12189, HR 765, SAO 75471 | |
| 30 Arietis B: BD+24°375, HD 16232, HIP 12184, HR 764, SAO 75470 | |
| Database references | |
| SIMBAD | A |
| B | |
| Exoplanet Archive | data |
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 1,700 AU at a distance of 145 light-years away. The main components of both systems are both binaries with composite spectra belonging to F-type main-sequence stars, meaning they are fusing hydrogen in their cores. 30 Arietis B also has a second stellar companion, making a total of five stars. The 30 Arietis system is 910 million years old, one fifth the age of the Sun.