30 Arietis

30 Arietis (abbreviated 30 Ari) is a 6th-apparent-magnitude quadruple star[4] 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.[3] 30 Arietis A is itself a spectroscopic binary with an orbital period of 1.1 days.[5] The 30 Arietis system is 910 million years old, one fifth the age of the Sun.

30 Arietis

Observation data
Epoch J2000      Equinox J2000
Constellation Aries
30 Arietis A
Right ascension  02h 37m 00.5235s[1]
Declination +24° 38′ 49.9880″[1]
Apparent magnitude (V)
30 Arietis B
Right ascension  02h 36m 57.7449s[2]
Declination +24° 38′ 53.0026″[2]
Apparent magnitude (V)
Astrometry
30 Arietis A
Proper motion (μ) RA: 136.862±0.137[1] mas/yr
Dec.: −15.188±0.141[1] mas/yr
Parallax (π)22.1261 ± 0.0726[1] mas
Distance147.4 ± 0.5 ly
(45.2 ± 0.1 pc)
30 Arietis B
Proper motion (μ) RA: 141.411±0.083[2] mas/yr
Dec.: −10.677±0.086[2] mas/yr
Parallax (π)22.3641 ± 0.0516[2] mas
Distance145.8 ± 0.3 ly
(44.7 ± 0.1 pc)
Characteristics
Spectral type F5 V / F6 V[3]
B−V color index 0.410 / 0.510[3]
Details
30 Arietis A
Mass1.31 ± 0.04[3] M☉
Radius1.37 ± 0.03[3] R☉
30 Arietis B
Mass1.16 ± 0.04[3] M☉
Radius1.13 ± 0.03[3] R☉
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
SIMBADdata
Exoplanet Archivedata
Extrasolar Planets
Encyclopaedia		data
Data sources:
Hipparcos Catalogue,
CCDM (2002),
Bright Star Catalogue (5th rev. ed.)

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.[3]

The 30 Arietis B planetary system[6]
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b ≥6.6±0.9 MJ 1.01±0.01 345.4±3.8 0.18±0.11 — —

See also

References
  1. Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  2. Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  3. 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.
  4. Whitney Clavin (2015). "Planet 'Reared' by Four Parent Stars | NASA". NASA. Retrieved 4 March 2015.
  5. 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.
  6. Kane, Stephen R.; et al. (2015). "On the Stellar Companion to the Exoplanet Hosting Star 30 Arietis B". The Astrophysical Journal. 815 (1). 32. arXiv:1511.01533. Bibcode:2015ApJ...815...32K. doi:10.1088/0004-637X/815/1/32.


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