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30 Arietis

30 Arietis star system hierarchy
Observation data Epoch J2000      Equinox J2000
Constellation	Aries
30 Arietis A
Right ascension	02 37 00.5235
Declination	+24° 38′ 49.9880″
30 Arietis B
Right ascension	02 36 57.7449
Declination	+24° 38′ 53.0026″
Characteristics
Spectral type	F5 V / F6 V
B−V color index	0.410 / 0.510
Astrometry
30 Arietis A
Proper motion (μ)	RA: 136.862±0.137 mas/yr Dec.: −15.188±0.141 mas/yr
Parallax (π)	22.1261 ± 0.0726 mas
Distance	147.4 ± 0.5 ly (45.2 ± 0.1 pc)
30 Arietis B
Proper motion (μ)	RA: 141.411±0.083 mas/yr Dec.: −10.677±0.086 mas/yr
Parallax (π)	22.3641 ± 0.0516 mas
Distance	145.8 ± 0.3 ly (44.7 ± 0.1 pc)
Orbit
Primary	30 Arietis A
Companion	30 Arietis BC
Period (P)	34000 yr
Semi-major axis (a)	40" (1670 AU)
Orbit
Primary	30 Arietis B
Companion	30 Arietis C
Period (P)	80 yr
Semi-major axis (a)	22.3 AU
Orbit
Primary	30 Arietis B
Companion	30 Arietis Bb
Period (P)	335.1 ± 2.5 d (0.917 ± 0.007 yr)
Semi-major axis (a)	0.995 ± 0.012 AU
Eccentricity (e)	0.289 ± 0.092
Inclination (i)	4.14+0.96 −0.90°°
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
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
Data sources:
Hipparcos Catalogue, CCDM (2002), Bright Star Catalogue (5th rev. ed.)

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 1,500 AU at a distance of 130 light years away. The main components of both systems are both binaries with a composite spectra belonging to F-type main-sequence stars, meaning they are fusing hydrogen in their cores. The 30 Arietis system is 910 million years old, one fifth the age of the Sun.

Star system

30 Arietis A and B are separated by 38.1", corresponding to 1,500 AU at a distance of 130 light years. The pair are at almost the same distance, have very similar proper motions, and are considered almost certain to be gravitationally bound with a likely period around 34,000 years. The main components of both systems are both binaries with a composite spectra belonging to F-type main-sequence stars, meaning they are fusing hydrogen in their cores.

30 Arietis A is a spectroscopic binary with an orbital period of 1.1 days. The primary Aa is an F-type main sequence star about 31% more massive than the Sun, while the companion Ab is a faint red dwarf only about 15% the mass of the Sun.

30 Arietis B has been reported to have a red dwarf companion at a distance of 22 AU and another red dwarf Bb at about 1 AU. In 2020, after the inclination of the planetary orbit was measured, the "planet" was found to fall in the mass range of a brown or red dwarf. The more distant companion was referred to as C to distinguish it from Bb, and at about 0.5" it has been imaged using adaptive optics.

30 Arietis Bb

30 Arietis Bb (sometimes abbreviated 30 Ari Bb) is a red dwarf which orbits the F-type main sequence star 30 Arietis Ba, located in a quintuple star system approximately 146 light years away in the constellation Aries. The red dwarf was discovered by on Friday, November 27, 2009 by using precise radial velocity method from echelle spectrograph installed in the Alfred-Jensch telescope in Karl Schwarzschild Observatory. The star had a minimum mass of nearly 10 times that of Jupiter. In 2020, after the inclination of the planetary orbit was measured to be just 4.14
_−0.90°, the "planet" was found to fall in the mass range of red dwarf stars.

See also

• HD 114762 b
• HD 114762

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. S2CID 55685116.
4. ^ Whitney Clavin (2015). "Planet 'Reared' by Four Parent Stars". NASA. Retrieved 4 March 2015.
5. ^ Roberts Jr, Lewis C.; Tokovinin, Andrei; Mason, Brian D.; Riddle, Reed L.; Hartkopf, William I.; Law, Nicholas M.; Baranec, Christoph (2015). "Know the Star, Know the Planet. III. Discovery of Late-Type Companions to Two Exoplanet Host Stars". The Astronomical Journal. 149 (4): 118. arXiv:1503.01211. Bibcode:2015AJ....149..118R. doi:10.1088/0004-6256/149/4/118. S2CID 30908636.
6. ^ Kiefer, Flavien; Hébrard, Guillaume; Lecavelier, Alain; Martioli, Eder; Dalal, Shweta; Vidal-Madjar, Alfred (2021). "Determining the true mass of radial-velocity exoplanets with Gaia 9 planet candidates in the brown-dwarf/stellar regime and 27 confirmed planets". Astronomy & Astrophysics. A7: 645. arXiv:2009.14164. doi:10.1051/0004-6361/202039168. S2CID 221995447.
7. 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.
8. Jean Schneider (2011). "Notes for Planet 30 Ari B b". Extrasolar Planets Encyclopaedia. Retrieved 3 October 2011.

External links

• Image 30 Arietis
• Double stars
• NASA diagram of the 30 Ari System

v t e Constellation of Aries
Aries in Chinese astronomy List of stars in Aries
Stars	Bayer α (Hamal) β (Sheratan) γ (Mesarthim) δ (Botein) ε ζ η θ ι κ λ μ ν ξ ο π ρ ρ ρ σ τ τ Flamsteed 1 4 7 10 11 14 15 16 19 20 21 23 26 27 29 30 31 33 35 36 38 39 (Lilii Borea) 40 41 (Bharani) 47 49 50 51 52 53 54 55 56 59 60 62 64 65 66 54 Cet 85 Cet Variable TZ UX VZ (16 Tri) HR 577 728 803 952 999 HD 12661 20367 Other BD+20°307 HIP 14810 HAT-P-25 Teegarden's Star WASP-11/HAT-P-10 WD 0145+234
Exoplanets α Arietis b HD 12661 b c HIP 14810 b c d Teegarden's Star b c WASP-11b/HAT-P-10b
Galaxies	NGC 677 680 691 694 695 716 765 770 772 781 803 817 820 821 871 877 900 901 903 904 918 935 938 972 990 992 1024 1134 1156 Other 1ES 0229+200 3C 79 4C +28.07 AO 0235+164 IC 167 IC 1801 PSO J0309+27 Segue 2 UGC 2140
Galaxy clusters MS 0302+17
Astronomical events GRB 060218
Category

• Aries (constellation)
• F-type main-sequence stars
• Multiple star systems
• Solar-type stars
• Flamsteed objects
• Bright Star Catalogue objects
• Henry Draper Catalogue objects
• Durchmusterung objects
• Hipparcos objects
• M-type main-sequence stars