30 Arietis

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30 Arietis
Quadruple Star System 30 Ari
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
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 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[edit]

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]

The 30 Arietis B planetary system[2][5]
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[edit]

References[edit]

  1. ^ a b c d e f g h i j van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752Freely accessible. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357.  Vizier catalog entry for A Vizier catalog entry for B
  2. ^ a b c d e f g h i Guenther, E. W.; et al. (2009). "A substellar component orbiting the F-star 30 Arietis B". Astronomy and Astrophysics. 507 (3): 1659–1665. arXiv:0912.4619Freely accessible. Bibcode:2009A&A...507.1659G. doi:10.1051/0004-6361/200912112. 
  3. ^ Whitney Clavin (2015). "Planet 'Reared' by Four Parent Stars | NASA". NASA. Retrieved 4 March 2015. 
  4. ^ 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. 
  5. ^ Jean Schneider (2011). "Notes for star 30 Ari B". Extrasolar Planets Encyclopaedia. Retrieved 3 October 2011. 

External links[edit]

Coordinates: Sky map 02h 36m 00.5237s, +24° 38′ 50.000″