30 Arietis
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| Observation data Epoch J2000 Equinox J2000 |
|
|---|---|
| Constellation | Aries |
| 30 Arietis A | |
| Right ascension | 02h 37m 00.52s |
| Declination | +24° 38′ 50.0″ |
| Apparent magnitude (V) | 6.48 |
| 30 Arietis B | |
| Right ascension | 02h 36m 57.74s |
| Declination | +24° 38′ 53.0″ |
| Apparent magnitude (V) | 7.09 |
| Astrometry | |
| 30 Arietis A | |
| Radial velocity (Rv) | 14.9 km/s |
| Proper motion (μ) |
RA: 136.96 ± 0.60 mas/yr Dec.: –14.69 ± 0.43 mas/yr |
| Parallax (π) | 23.95 ± 0.59mas |
| Distance | 136 ± 3 ly (42 ± 1 pc) |
| Absolute magnitude (MV) | 3.46 |
| 30 Arietis B | |
| Radial velocity (Rv) | 17.2 km/s |
| Proper motion (μ) |
RA: 150.75 ± 0.75 mas/yr Dec.: –12.79 ± 0.54 mas/yr |
| Parallax (π) | 24.52 ± 0.68mas |
| Distance | 133 ± 4 ly (41 ± 1 pc) |
| Absolute magnitude (MV) | 4.11 |
| Characteristics | |
| Spectral type | F5 V / F6 V |
| U−B color index | 0.02 |
| B−V color index | 0.410 / 0.510 |
| Details | |
| 30 Arietis A | |
| Mass | 1.31 ± 0.04 M☉ |
| Radius | 1.37 ± 0.03 R☉ |
| Luminosity | 3.6 L☉ |
| Temperature | 6300 ± 100 K |
| Age | (0.91 ± 0.03) × 109 years |
| 30 Arietis B | |
| Mass | 1.16 ± 0.04 M☉ |
| Radius | 1.13 ± 0.03 R☉ |
| Luminosity | 1.964 L☉ |
| Temperature | 6424 ± 180 K |
| Metallicity | 0.07 ± 0.2 |
| Age | (0.91 ± 0.03) × 109 years |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
| Extrasolar Planets Encyclopaedia |
data |
| Data sources: | |
|
Hipparcos Catalogue, CCDM (2002), Bright Star Catalogue (5th rev. ed.) |
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30 Arietis A
BD+24°376, HD 16246, HIP 12189, HR 765, SAO 75471
30 Arietis (abbreviated 30 Ari) is a 6th-apparent-magnitude quadruple star in the constellation of Aries. 30 Arietis is the Flamsteed designation. 30 Arietis A and B are separated by 38.1" or about 1500 AU at a distance of 130 light years away. The main components of both systems are F-type main-sequence stars, meaning they are fusing hydrogen in their cores. 30 Arietis A is itself a spectroscopic binary with an orbital period of 1.1 days. The 30 Arietis system is 910 million years old, one fifth the age of the Sun.
On November 27, 2009, the discovery of a very massive planet was announced to be orbiting 30 Arietis B at a distance of about 1 AU.
Coordinates: 
02h 36m 00.5237s, +24° 38′ 50.000″
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