30 Arietis
 | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Aries |
| 30 Arietis A | |
| Right ascension | 02h 37m 00.52s[1] |
| Declination | +24° 38′ 50.0″[1] |
| Apparent magnitude (V) | 6.48 |
| 30 Arietis B | |
| Right ascension | 02h 36m 57.74s[1] |
| Declination | +24° 38′ 53.0″[1] |
| Apparent magnitude (V) | 7.09 |
| Astrometry | |
| 30 Arietis A | |
| Radial velocity (Rv) | 14.9 km/s |
| Proper motion (μ) | RA: 136.96 ± 0.60[1] mas/yr Dec.: –14.69 ± 0.43[1] mas/yr |
| Parallax (π) | 23.95 ± 0.59[1] mas |
| 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[1] mas/yr Dec.: –12.79 ± 0.54[1] mas/yr |
| Parallax (π) | 24.52 ± 0.68[1] mas |
| Distance | 133 ± 4 ly (41 ± 1 pc) |
| Absolute magnitude (MV) | 4.11 |
| Characteristics | |
| Spectral type | F5 V / F6 V[2] |
| U−B color index | 0.02 |
| B−V color index | 0.410 / 0.510[2] |
| Details | |
| 30 Arietis A | |
| Mass | 1.31 ± 0.04[2] M☉ |
| Radius | 1.37 ± 0.03[2] R☉ |
| Luminosity | 3.6 L☉ |
| Temperature | 6300 ± 100 K |
| Age | (0.91 ± 0.03) × 109 years |
| 30 Arietis B | |
| Mass | 1.16 ± 0.04[2] M☉ |
| Radius | 1.13 ± 0.03[2] 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.) | |
30 Arietis (abbreviated 30 Ari) is a 6th-apparent-magnitude quadruple star[3] 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.[2] 30 Arietis A is itself a spectroscopic binary with an orbital period of 1.1 days.[4] The 30 Arietis system is 910 million years old, one fifth the age of the Sun.
Planetary system
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.[2]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | ≥9.88 ± 0.94 MJ | 0.995 ± 0.012 | 335.1 ± 2.5 | 0.289 ± 0.092 | — | — |
See also
References
- 1 2 3 4 5 6 7 8 9 10 van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. Vizier catalog entry for A Vizier catalog entry for B
- 1 2 3 4 5 6 7 8 9 Guenther, E. W.; et al. (2009). "A substellar component orbiting the F-star 30 Arietis B". Astronomy and Astrophysics 507 (3): 1659–1665. arXiv:0912.4619. Bibcode:2009A&A...507.1659G. doi:10.1051/0004-6361/200912112.
- ↑ Whitney Clavin (2015). "Planet 'Reared' by Four Parent Stars | NASA". NASA. Retrieved 4 March 2015.
- ↑ Morbey, C. L.; Brosterhus, E. B. (1974). "A Search for Spectroscopic Binaries from Published Radial Velocity Data". Publications of the Astronomical Society of the Pacific 86 (512): 455. Bibcode:1974PASP...86..455M. doi:10.1086/129630. JSTOR 40675565 – via JSTOR. (registration required (help)).
- ↑ Jean Schneider (2011). "Notes for star 30 Ari B". Extrasolar Planets Encyclopaedia. Retrieved 3 October 2011.
External links
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Coordinates: 
02h 36m 00.5237s, +24° 38′ 50.000″
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