H Eridani

HD 23319
	Location of h Eri (circled)
Observation data; Epoch J2000 Equinox J2000
Constellation	Eridanus
Right ascension	03h 42m 50.0549s
Declination	−37° 18′ 48.661″
Apparent magnitude (V)	4.59
Characteristics
Spectral type	K1.5 IIIb CN0.5
B−V color index	1.191±0.002
Astrometry
Radial velocity (Rv)	+9.90±0.07 km/s
Proper motion (μ)	RA: −91.264(70) mas/yr ; Dec.: −70.315(85) mas/yr
Parallax (π)	18.5379 ± 0.0757 mas
Distance	175.9 ± 0.7 ly ; (53.9 ± 0.2 pc)
Absolute magnitude (MV)	0.83
Details
Mass	1.42±0.09 M☉
Radius	11.38±0.07 R☉
Luminosity	51.52±0.67 L☉
Surface gravity (log g)	2.56±0.05 cgs
Temperature	4,592±14 K
Metallicity [Fe/H]	+0.03±0.06 dex
Rotational velocity (v sin i)	1.70±0.43 km/s
Age	3.17±0.42 Gyr
Other designations
	h Eri, CD−37°1415, FK5 2265, HD 23319, HIP 17351, HR 1143, SAO 194475
Database references
SIMBAD	data

h Eridani (HD 23319) is an orange-hued star in the constellation Eridanus. It has an apparent visual magnitude of 4.59,^[2] which make it faintly visible to the naked eye in skies with low light pollution. The distance to HD 23319 can be estimated from its annual parallax shift of 18.5 mas,^[1] which yields a distance of about 176 light years. It is moving further away from the Earth with a heliocentric radial velocity of +9.9 km/s.^[4]

This is an aging giant star with a stellar classification of K1.5 IIIb CN0.5,^[3] where the suffix notation indicates the spectrum shows a mild overabundance of the cyano radical. It is a red clump giant, indicating it is on the horizontal branch and is generating energy through helium fusion at its core.^[7] The star has 1.4 times the mass of the Sun and, at the age of 3.2 billion years, has expanded to 11 times the Sun's radius. It is radiating 51 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,592 K.^[5]

References

^ ^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 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 Keenan, Philip C.; McNeil, Raymond C. (1989), "The Perkins catalog of revised MK types for the cooler stars", Astrophysical Journal Supplement Series, 71: 245, Bibcode:1989ApJS...71..245K, doi:10.1086/191373.
^ ^a ^b ^c ^d ^e Jofré, E.; Petrucci, R.; Saffe, C.; Saker, L.; de la Villarmois, E. Artur.; Chavero, C.; Gómez, M.; Mauas, P. J. D. (2015), "Stellar parameters and chemical abundances of 223 evolved stars with and without planets", Astronomy & Astrophysics, 574: A50, arXiv:1410.6422, Bibcode:2015A&A...574A..50J, doi:10.1051/0004-6361/201424474, S2CID 53666931.
^ ^a ^b ^c ^d ^e ^f ^g ^h Gallenne, A.; Pietrzyński, G.; Graczyk, D.; Nardetto, N.; Mérand, A.; Kervella, P.; Gieren, W.; Villanova, S.; Mennickent, R. E.; Pilecki, B. (2018-08-01), "Fundamental properties of red-clump stars from long-baseline H-band interferometry", Astronomy & Astrophysics, 616: A68, arXiv:1806.09572, Bibcode:2018A&A...616A..68G, doi:10.1051/0004-6361/201833341, ISSN 0004-6361
^ "HD 23319". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-07-21.
^ Laney, C. D.; et al. (2012), "A new Large Magellanic Cloud K-band distance from precision measurements of nearby red clump stars", Monthly Notices of the Royal Astronomical Society, 419 (2): 1637, arXiv:1109.4800, Bibcode:2012MNRAS.419.1637L, doi:10.1111/j.1365-2966.2011.19826.x, S2CID 117788450.

[Gaia_DR3-1] 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.

[Anderson2012-2] 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.

[perkins1989-3] Keenan, Philip C.; McNeil, Raymond C. (1989), "The Perkins catalog of revised MK types for the cooler stars", Astrophysical Journal Supplement Series, 71: 245, Bibcode:1989ApJS...71..245K, doi:10.1086/191373.

[jofre2015-4] Jofré, E.; Petrucci, R.; Saffe, C.; Saker, L.; de la Villarmois, E. Artur.; Chavero, C.; Gómez, M.; Mauas, P. J. D. (2015), "Stellar parameters and chemical abundances of 223 evolved stars with and without planets", Astronomy & Astrophysics, 574: A50, arXiv:1410.6422, Bibcode:2015A&A...574A..50J, doi:10.1051/0004-6361/201424474, S2CID 53666931.

[Gallenne2018-5] ^ ^a ^b ^c ^d ^e ^f ^g ^h Gallenne, A.; Pietrzyński, G.; Graczyk, D.; Nardetto, N.; Mérand, A.; Kervella, P.; Gieren, W.; Villanova, S.; Mennickent, R. E.; Pilecki, B. (2018-08-01), "Fundamental properties of red-clump stars from long-baseline H-band interferometry", Astronomy & Astrophysics, 616: A68, arXiv:1806.09572, Bibcode:2018A&A...616A..68G, doi:10.1051/0004-6361/201833341, ISSN 0004-6361

[SIMBAD-6] "HD 23319". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-07-21.

[laney2012-7] Laney, C. D.; et al. (2012), "A new Large Magellanic Cloud K-band distance from precision measurements of nearby red clump stars", Monthly Notices of the Royal Astronomical Society, 419 (2): 1637, arXiv:1109.4800, Bibcode:2012MNRAS.419.1637L, doi:10.1111/j.1365-2966.2011.19826.x, S2CID 117788450.

[1]

[2]

[3]

[4]

[5]

[6]

[7]

H Eridani

References

Portal di Ensiklopedia Dunia