45 Aurigae

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45 Aurigae

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45 Aurigae
Observation data Epoch J2000 Equinox J2000
Constellation	Auriga
Right ascension	06^h 21^m 46.12968^s^[1]
Declination	+53° 27′ 07.8456″^[1]
Apparent magnitude (V)	5.34^[2]
Characteristics
Spectral type	F5 V^[3]^[2]
B−V color index	0.448±0.005^[2]
Astrometry

Radial velocity (R_v)	−0.4±0.1^[4] km/s
Proper motion (μ)	RA: +21.98^[1] mas/yr Dec.: -88.69^[1] mas/yr
Parallax (π)	16.89 ± 0.30 mas^[1]
Distance	193 ± 3 ly (59 ± 1 pc)
Absolute magnitude (M_V)	1.48^[2]

Orbit^[5]
Period (P)	6.5011 d
Eccentricity (e)	0.000
Periastron epoch (T)	2444496.869 ± 0.006 JD
Argument of periastron (ω) (secondary)	0.000°
Semi-amplitude (K₁) (primary)	32.0±0.2 km/s
Details
45 Aur A
Mass	1.20^[6] `M`_☉
Luminosity	21.72^[2] `L`_☉
Surface gravity (log g)	3.57±0.14^[6] cgs
Temperature	6,489±221^[6] K
Metallicity [Fe/H]	0.23±0.03^[2] dex
Rotational velocity (v sin i)	14^[7] km/s
Age	1.561^[6] Gyr

Other designations
45 Aur, BD+53° 1008, FK5 2484, GC 8151, HD 43905, HIP 30247, HR 2264, SAO 25681, PPM 30377, PLX 1468.2, TYC 3764-2617-1^[8]
Database references
SIMBAD	data

45 Aurigae or PLX 1468.2 is a binary star^[5] system in the northern constellation of Auriga. It has an apparent visual magnitude of 5.34,^[2] making it visible to the naked eye under suitable viewing conditions. An annual parallax shift of 16.89 mas as seen from Earth's orbit indicates the system is located about 193 light years from the Sun.

This is a close, single-lined spectroscopic binary with a circularized orbit with a short period of 6.5 days.^[5] They have a mean angular separation of 0.963 mas.^[9] The visible component has a stellar classification of F5 V,^[3] matching an F-type main-sequence star that is generating energy through hydrogen fusion at it core. It is about 1.6^[6] billion years old and is spinning with a projected rotational velocity of 14 K.^[7] It has 1.2^[6] times the mass of the Sun and is radiating 22^[2] times the Sun's luminosity from its photosphere at an effective temperature of around 6,489 K.^[6] The secondary has a minimum mass of 42% of the Sun's mass.^[9]

References

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^ ^a ^b ^c ^d ^e 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, S2CID 18759600.
^ ^a ^b ^c ^d ^e ^f ^g ^h Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015, S2CID 119257644.
^ ^a ^b Abt, Helmut A. (January 2009), "MK Classifications of Spectroscopic Binaries", The Astrophysical Journal Supplement, 180 (1): 117–118, Bibcode:2009ApJS..180..117A, doi:10.1088/0067-0049/180/1/117, S2CID 122811461.
^ de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics, 546: 14, arXiv:1208.3048, Bibcode:2012A&A...546A..61D, doi:10.1051/0004-6361/201219219, S2CID 59451347, A61.
^ ^a ^b ^c Mayor, M.; Mazeh, T. (January 1987), "The frequency of triple and multiple stellar systems", Astronomy and Astrophysics, 171: 157–177, Bibcode:1987A&A...171..157M.
^ ^a ^b ^c ^d ^e ^f ^g David, Trevor J.; Hillenbrand, Lynne A. (2015), "The Ages of Early-type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets", The Astrophysical Journal, 804 (2): 146, arXiv:1501.03154, Bibcode:2015ApJ...804..146D, doi:10.1088/0004-637X/804/2/146, S2CID 33401607.
^ ^a ^b Böhm-Vitense, Erika (November 2004), "Rotation and Lithium Surface Abundances, Revisited", The Astronomical Journal, 128 (5): 2435–2442, Bibcode:2004AJ....128.2435B, doi:10.1086/425053..
^ "45 Aur". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-02-07.
^ ^a ^b Tokovinin, A.; et al. (2008), "Tertiary companions to close spectroscopic binaries", Multiple Stars Across the H-R Diagram, ESO Astrophysics Symposia, vol. 450, Berlin Heidelberg, p. 129, arXiv:astro-ph/0601518, Bibcode:2006A&A...450..681T, doi:10.1051/0004-6361:20054427.

External links

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Constellation of Auriga

Stars

Bayer	α (Capella) β (Menkalinan) γ (Elnath) δ ε (Almaaz) ζ (Saclateni) η (Haedus) θ (Mahasim) ι (Hassaleh) κ λ (Alhurr) μ ν ξ ο π ρ σ τ υ φ χ ψ¹ ψ² ψ³ ψ⁴ ψ⁵ ψ⁶ ψ⁷ ψ⁸ ψ⁹ ω
Flamsteed	2 5 6 9 12 14 16 18 19 22 26 28 36 38 39 40 41 42 43 45 47 49 51 53 54 59 60 62 63 64 65 66 35 Cam
Variable	R T RT (48) RW SU UU WW AB AE AR (17) EO IQ IU LY MZ NO NY PU QZ V352 V361 V394 V420 V433 V538
HR	1558 1615 1738 1752 1794 1795 1822 1825 1866 1884 1938 1945 2028 2096 2137
HD	33203 33463 35619 43691 45350 (Lucilinburhuc) 49674 (Nervia)
Other	Gliese 268 HAT-P-9 (Tevel) KELT-2 MWC 480 SGR 0501+4516 UGPS J0521+3640 WASP-12

Exoplanets	HAT-P-9b (Alef) HD 40979 b HD 43691 b HD 45350 b HD 49674 b KELT-2Ab WASP-12b

Star
clusters

NGC	1664 1893 1907 1931 2240 2281
Other	Messier 36 Messier 37 Messier 38 Palomar 2

Nebulae

NGC	1985 2242
Other	IC 405 IC 2149 Westbrook Nebula

Galaxies	3C 147 4C +41.17 DA 193 MCG +08-11-011

Galaxy clusters	MACS J0717.5+3745