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Psi4 Aurigae - Wikipedia

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Psi⁴ Aurigae
Observation data Epoch J2000.0 Equinox J2000.0 (ICRS)
Location of ψ⁴ Aurigae (circled)
Constellation	Auriga^[1]
Right ascension	06^h 43^m 04.972^s^[2]
Declination	+44° 31′ 28.02″^[2]
Apparent magnitude (V)	+5.02^[3]
Characteristics
Spectral type	K5 III^[4]
U−B color index	+1.83^[3]
B−V color index	+1.48^[3]
Astrometry

Radial velocity (R_v)	−77.35±0.23^[5] km/s
Proper motion (μ)	RA: −4.112 mas/yr^[2] Dec.: −30.066 mas/yr^[2]
Parallax (π)	10.1086±0.123 mas^[2]
Distance	323 ± 4 ly (99 ± 1 pc)
Absolute magnitude (M_V)	+0.06^[1]

Details

Mass	1.03^+0.79 _−0.23^[6] `M`_☉
Radius	24.9^[7] `R`_☉
Luminosity	182⁺¹³ ₋₁₂^[6] `L`_☉
Surface gravity (log g)	2.04±0.24^[8] cgs
Temperature	4,020±80^[6] K
Metallicity [Fe/H]	0.10±0.08^[8] dex
Rotational velocity (v sin i)	4.8^[5] km/s

Other designations
ψ⁴ Aur, 55 Aurigae, BD+44°1518, FK5 2517, GC 8751, HD 47914, HIP 32173, HR 2459, SAO 41288, PPM 49271^[9]
Database references
SIMBAD	data

Psi⁴ Aurigae is a single,^[10] orange-hued star in the northern constellation of Auriga. Its name is a Bayer designation that is Latinized from ψ⁴ Aurigae, and abbreviated Psi⁴ Aur or ψ⁴ Aur. This star is visible to the naked eye with an apparent visual magnitude of +5.02.^[3] With an annual parallax shift of 10.11 mas,^[2] it is approximately 323 light-years (99 parsecs) distant from Earth. The star is drifting closer to the Sun with a radial velocity of −77 km/s,^[5] and may approach to within 102 ly (31.3 pc) in around 1.1 million years.^[1]

This is a evolved K-type giant star with a stellar classification of K5 III,^[4] having exhausted the hydrogen at its core. With nearly the same mass as the Sun,^[6] it has expanded to 25 times the Sun's radius. The star is radiating 182 times the Sun's luminosity from its enlarged photosphere at an effective temperature of about 4,158 K.^[6] It is spinning with a projected rotational velocity of 4.8 km/s.^[5] This is an α–enhanced star, displaying a significant enhancement of silicon in its atmosphere.^[11]

Psi⁴ Aurigae was part of a much bigger constellation named Telescopium Herschelii before that asterism was no longer recognized by the International Astronomical Union (IAU).^{[citation needed]}

References

^ ^a ^b ^c 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. XHIP record for this object at VizieR.
^ ^a ^b ^c ^d ^e Vallenari, A.; et al. (Gaia collaboration) (2023), "Gaia Data Release 3. Summary of the content and survey properties", Astronomy and Astrophysics, 674: A1, arXiv:2208.00211, Bibcode:2023A&A...674A...1G, doi:10.1051/0004-6361/202243940, S2CID 244398875. Gaia DR3 record for this source at VizieR.
^ ^a ^b ^c ^d Johnson, H. L.; et al. (1966), "UBVRIJKL photometry of the bright stars", Communications of the Lunar and Planetary Laboratory, 4 (99): 99, Bibcode:1966CoLPL...4...99J.
^ ^a ^b Roman, Nancy G. (July 1952), "The Spectra of the Bright Stars of Types F5-K5", Astrophysical Journal, 116: 122, Bibcode:1952ApJ...116..122R, doi:10.1086/145598.
^ ^a ^b ^c ^d Massarotti, Alessandro; et al. (January 2008), "Rotational and Radial Velocities for a Sample of 761 HIPPARCOS Giants and the Role of Binarity", The Astronomical Journal, 135 (1): 209–231, Bibcode:2008AJ....135..209M, doi:10.1088/0004-6256/135/1/209, S2CID 121883397.
^ ^a ^b ^c ^d ^e Charbonnel, C.; et al. (January 2020), "Lithium in red giant stars: Constraining non-standard mixing with large surveys in the Gaia era", Astronomy and Astrophysics, 633: A34, arXiv:1910.12732, Bibcode:2020A&A...633A..34C, doi:10.1051/0004-6361/201936360, ISSN 0004-6361.
^ McDonald, I.; et al. (October 2017), "Fundamental parameters and infrared excesses of Tycho-Gaia stars", Monthly Notices of the Royal Astronomical Society, 471 (1): 770–791, arXiv:1706.02208, Bibcode:2017MNRAS.471..770M, doi:10.1093/mnras/stx1433, ISSN 0035-8711. Psi4 Aurigae's database entry at VizieR.
^ ^a ^b Prugniel, Ph.; et al. (2011), "The atmospheric parameters and spectral interpolator for the MILES stars", Astronomy & Astrophysics, 531: 25, arXiv:1104.4952, Bibcode:2011A&A...531A.165P, doi:10.1051/0004-6361/201116769, S2CID 54940439, A165.
^ "psi04 Aur". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-09-28.
^ Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.
^ Franchini, M.; et al. (January 2004), "Synthetic Lick Indices and Detection of α-Enhanced Stars", The Astrophysical Journal, 601 (1): 485–499, Bibcode:2004ApJ...601..485F, doi:10.1086/380443

External links

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 OH 471

Galaxy clusters	MACS J0717.5+3745