Psi6 Aurigae

For other stars with a similar Bayer designation, see ψ Aurigae.

Psi^6 Aurigae

Location of ψ^6 Aurigae (circled)
Observation data Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation	Auriga
Right ascension	06^h 47^m 39.57703^s[1]
Declination	+48° 47′ 22.1222″[1]
Apparent magnitude (V)	+5.22[2]
Characteristics
Spectral type	K0.5 III[1]
U−B color index	+1.04[2]
B−V color index	+1.11[2]
Astrometry
Radial velocity (Rv)	−6.51±0.30[3] km/s
Proper motion (μ)	RA: −4.32[1] mas/yr Dec.: +7.19[1] mas/yr
Parallax (π)	9.05 ± 0.38 mas[1]
Distance	360 ± 20 ly (110 ± 5 pc)
Absolute magnitude (MV)	+0.01[4]
Orbit[5]
Period (P)	5,996±26 d
Eccentricity (e)	0.044±0.014
Periastron epoch (T)	52556 ± 310 MJD
Argument of periastron (ω) (secondary)	222±19°
Semi-amplitude (K1) (primary)	3.24±0.04 km/s
Details[6]
ψ^6 Aur A
Mass	2.02±0.28 M☉
Radius	17.72±0.76 R☉
Luminosity	123.4±10.2 L☉
Surface gravity (log g)	2.25±0.07 cgs
Temperature	4,574±26 K
Metallicity [Fe/H]	−0.08±0.10 dex
Rotational velocity (v sin i)	+10[7] km/s
Age	1.55±0.67 Gyr
Other designations
ψ^6 Aur, 57 Aurigae, BD+48° 1436, FK5 1176, HD 48781, HIP 32562, HR 2487, SAO 41346[8]
Database references
SIMBAD	data

Psi⁶ Aurigae, Latinized from ψ⁶ Aurigae, is a spectroscopic binary^[5] star in the northern constellation of Auriga. It is a dim, naked eye star with an apparent visual magnitude of +5.22.^[2] Based upon a measured annual parallax shift of 9.05 ± 0.38 mas,^[1] it is approximately 360 light-years (110 parsecs) distant from the Earth.

This is a single-lined spectroscopic binary star system with an orbital period of 5,996 days (16.4 years) and an eccentricity of 0.044.^[5] The visible component is a K-type giant star with a stellar classification of K0.5 III.^[1] It is most likely (78% chance) on the red giant branch and is around 1.55 billion years old. As such, it has an estimated double the mass of the Sun and about 18 times the Sun's radius. The star is radiating about 123 times the Sun's luminosity from its photosphere at an effective temperature of 4,574 K.^[6]

See also

• Psi Aurigae

References

1. 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.
2. Argue, A. N. (1966), "UBV photometry of 550 F, G and K type stars", Monthly Notices of the Royal Astronomical Society, 133 (4): 475–493, Bibcode:1966MNRAS.133..475A, doi:10.1093/mnras/133.4.475.
3. 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.
4. 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.
5. Griffin, R. F. (February 2010), "Spectroscopic binary orbits from photoelectric radial velocities - Paper 210: Psi2 Aurigae and 34 Pegasi", The Observatory, 130 (1): 17–32, Bibcode:2010Obs...130...17G.
6. Reffert, Sabine; et al. (2015), "Precise radial velocities of giant stars. VII. Occurrence rate of giant extrasolar planets as a function of mass and metallicity", Astronomy & Astrophysics, 574: A116, arXiv:1412.4634, Bibcode:2015A&A...574A.116R, doi:10.1051/0004-6361/201322360, hdl:10722/215277, S2CID 59334290. The values presented are for the RGB branch model.
7. Bernacca, P. L.; Perinotto, M. (1970), "A catalogue of stellar rotational velocities", Contributi Osservatorio Astronomico di Padova in Asiago, 239: 1, Bibcode:1970CoAsi.239....1B.
8. "psi06 Aur". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-09-28.

External links

• HR 2487
• Image Psi⁶ Aurigae