HD 120565

HD 120565, also designated as HR 5203, is a star located in the northern circumpolar constellation Camelopardalis. It is faintly visible to the naked eye as an orange-hued point of light with an apparent magnitude of 5.91. Gaia DR3 parallax measurements imply a distance of 370 light-years and it is currently drifting closer with a heliocentric radial velocity of −45.2 km/s. At its current distance, HD 120565's brightness is diminished by 0.12 magnitudes due to interstellar extinction^[13] and it has an absolute magnitude of +0.48.^[6]

HD 120565

Location of HD 120565 on the map (circled)
Observation data Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation	Camelopardalis
Right ascension	13h 42m 23.18342s[1]
Declination	+82° 45′ 08.7103″[1]
Apparent magnitude (V)	5.91±0.01[2]
Characteristics
Spectral type	G9 III[3]
B−V color index	+1.01[4]
Astrometry
Radial velocity (Rv)	−45.2±1.2[5] km/s
Proper motion (μ)	RA: +29.995 mas/yr[1] Dec.: −43.734 mas/yr[1]
Parallax (π)	8.8109 ± 0.0364 mas[1]
Distance	370 ± 2 ly (113.5 ± 0.5 pc)
Absolute magnitude (MV)	+0.48[6]
Details
Mass	2.70±0.11[1] M☉
Radius	10.8+0.3 −0.2[7] R☉
Luminosity	64.1±0.5[1] L☉
Surface gravity (log g)	2.47[8] cgs
Temperature	4,993±122[9] K
Metallicity [Fe/H]	−0.20[10] dex
Rotational velocity (v sin i)	2.6±1[11] km/s
Age	503+75 −70[1] Myr
Other designations
AG+83°357, BD+83°397, FK5 1643, GC 18611, HD 120565, HIP 66878, HR 5203, SAO 2266[12]
Database references
SIMBAD	data

HD 120565 has a stellar classification of G9 III,^[3] indicating that it is an evolved G-type giant star. It has 2.7 times the mass of the Sun^[1] but at the age of 503 million years,^[1] it has expanded to 10.8 times the radius of the Sun.^[7] It radiates 64.1 times the luminosity of the Sun^[1] from its enlarged photosphere at an effective temperature of 4,993 K.^[9] HD 120565 is metal deficient with an iron abundance 63.1% that of the Sun's or [Fe/H] = −0.22,^[10] and it spins modestly with a projected rotational velocity of 2.6 km/s.^[11] It was determined to be a single-lined spectroscopic binary by J.R. De Mederios and J. R. P. da Silva based on radial velocity variations.^[11]

References

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.
2. Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27–L30. Bibcode:2000A&A...355L..27H. ISSN 0004-6361. S2CID 17128864.
3. Cowley, A. P.; Bidelman, W. P. (February 1979). "MK spectral types for some F and G stars". Publications of the Astronomical Society of the Pacific. 91: 83. Bibcode:1979PASP...91...83C. doi:10.1086/130446. eISSN 1538-3873. ISSN 0004-6280.
4. Haggkvist, L.; Oja, T. (1970). "Results of BV photometry 1969-70 (Uppsala refractor)". Private Communication. Bibcode:1970Priv.........0H. S2CID 231475662.
5. Gontcharov, G. A. (November 2006). "Pulkovo Compilation of Radial Velocities for 35,495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. eISSN 1562-6873. ISSN 1063-7737. S2CID 119231169.
6. Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331–346. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. eISSN 1562-6873. ISSN 1063-7737. S2CID 119257644.
7. Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
8. Anders, F.; et al. (August 2019). "Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia DR2 stars brighter than G = 18". Astronomy & Astrophysics. 628: A94. arXiv:1904.11302. Bibcode:2019A&A...628A..94A. doi:10.1051/0004-6361/201935765. eISSN 1432-0746. ISSN 0004-6361. S2CID 131780028.
9. Stassun, Keivan G.; et al. (9 September 2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal. 158 (4): 138. arXiv:1905.10694. Bibcode:2019AJ....158..138S. doi:10.3847/1538-3881/ab3467. eISSN 1538-3881. hdl:1721.1/124721. S2CID 166227927.
10. Charbonnel, C.; Lagarde, N.; Jasniewicz, G.; North, P. L.; Shetrone, M.; Krugler Hollek, J.; Smith, V. V.; Smiljanic, R.; Palacios, A.; Ottoni, G. (January 2020). "Lithium in red giant stars: Constraining non-standard mixing with large surveys in the Gaia era". Astronomy & Astrophysics. 633: A34. arXiv:1910.12732. Bibcode:2020A&A...633A..34C. doi:10.1051/0004-6361/201936360. eISSN 1432-0746. ISSN 0004-6361. S2CID 204907220.
11. De Medeiros, J. R.; Da Silva, J. R. P.; Maia, M. R. G. (20 October 2002). "The Rotation of Binary Systems with Evolved Components". The Astrophysical Journal. 578 (2): 943–950. arXiv:astro-ph/0207288. Bibcode:2002ApJ...578..943D. doi:10.1086/342613. eISSN 1538-4357. ISSN 0004-637X. S2CID 16196039.
12. "HD 120565". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved August 22, 2023.
13. Gontcharov, George A.; Mosenkov, Aleksandr V. (28 September 2017). "Verifying reddening and extinction for Gaia DR1 TGAS main sequence stars". Monthly Notices of the Royal Astronomical Society. 472 (4): 3805–3820. arXiv:1709.01160. Bibcode:2017MNRAS.472.3805G. doi:10.1093/mnras/stx2219. eISSN 1365-2966. ISSN 0035-8711. S2CID 118879856.