HD 210434

HD 210434
Observation data; Epoch J2000 Equinox J2000
Constellation	Aquarius
Right ascension	22h 10m 33.74601s
Declination	−04° 16′ 00.6776″
Apparent magnitude (V)	5.979
Characteristics
Spectral type	KG8/0III
U−B color index	0.84
B−V color index	0.981
Astrometry
Radial velocity (Rv)	−18.1 km/s
Proper motion (μ)	RA: +71.82 mas/yr ; Dec.: +3.74 mas/yr
Parallax (π)	9.81 ± 0.44 mas
Distance	330 ± 10 ly ; (102 ± 5 pc)
Absolute magnitude (MV)	1.30
Details
Mass	2.4 M☉
Surface gravity (log g)	3.0 cgs
Temperature	4,928 K
Metallicity [Fe/H]	0.090±0.090 dex
Rotational velocity (v sin i)	3.3 km/s
Age	630 Myr
Other designations
	BD-04° 5625, HD 210434, HIP 109466, HR 8453, SAO 145916.
Database references
SIMBAD	data

HD 210434 is a subgiant star^[3] in the equatorial constellation of Aquarius. According to the Bortle scale, an apparent magnitude of six means this star is faintly visible to the naked eye from dark rural skies. It is an estimated 630 million years old with 2.4 times the mass of the Sun.^[3]

References

^ ^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 Soubiran, C.; et al. (June 2010), "The PASTEL catalogue of stellar parameters", Astronomy and Astrophysics, 515: A111, arXiv:1004.1069, Bibcode:2010A&A...515A.111S, doi:10.1051/0004-6361/201014247, S2CID 118362423
^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j ^k Randich, S.; et al. (August 1999), "Lithium in population I subgiants", Astronomy and Astrophysics, 348: 487–500, Bibcode:1999A&A...348..487R
^ Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV Data. SIMBAD, Bibcode:1986EgUBV........0M
^ Wilson, R. E. (1953), "General Catalogue of Stellar Radial Velocities", Carnegie Institute Washington D.C. Publication, Carnegie Institute of Washington D.C., Bibcode:1953GCRV..C......0W

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Observation data Epoch J2000 Equinox J2000
Constellation	Aquarius
Right ascension	22^h 10^m 33.74601^s^[1]
Declination	−04° 16′ 00.6776″^[1]
Apparent magnitude (V)	5.979^[2]
Characteristics
Spectral type	KG8/0III^[3]
U−B color index	0.84^[4]
B−V color index	0.981^[3]
Astrometry

Radial velocity (R_v)	−18.1^[5] km/s
Proper motion (μ)	RA: +71.82^[1] mas/yr Dec.: +3.74^[1] mas/yr
Parallax (π)	9.81 ± 0.44 mas^[1]
Distance	330 ± 10 ly (102 ± 5 pc)
Absolute magnitude (M_V)	1.30^[3]

Details

Mass	2.4^[3] `M`_☉
Surface gravity (log g)	3.0^[3]^[2] cgs
Temperature	4,928^[3]^[2] K
Metallicity [Fe/H]	0.090±0.090^[3]^[2] dex
Rotational velocity (v sin i)	3.3^[3] km/s
Age	630^[3] Myr

Other designations
BD-04° 5625, HD 210434, HIP 109466, HR 8453, SAO 145916.
Database references
SIMBAD	data