HD 40235

HD 40235

Observation data Epoch J2000       Equinox J2000
Constellation	Lepus [1]
Right ascension	05h 56m 34.4388s [2]
Declination	−23° 12′ 55.121″ [2]
Apparent magnitude  (V)	6.37 [1]
Characteristics
Spectral type	K0III [1]
B−V color index	1.068±0.002 [1]
Astrometry
Radial velocity (Rv)	−4.64±0.12 [2] km/s
Proper motion (μ)	RA: +13.817 mas/yr [2] Dec.: +29.448 mas/yr [2]
Parallax (π)	6.8612±0.0187  mas [2]
Distance	475 ± 1  ly (145.7 ± 0.4  pc)
Absolute magnitude  (MV)	+0.69 [1]
Details
Mass	1.51 [3]   M☉
Radius	11.6 [4]   R☉
Luminosity	60 [4]   L☉
Surface gravity (log g)	2.78±0.03 [5]   cgs
Temperature	4,853±22 [5]   K
Metallicity [Fe/H]	−0.10±0.01 [5]   dex
Other designations
CD−23°3263, HD 40235, HIP 28118, HR 2090, TYC 6491-1059-1 [6]
Database references
SIMBAD	data

HD 40235 is a star in the constellation Lepus. At an apparent magnitude of 6.37, it is faintly visible to the naked eye in locations far from light pollution. Parallax measurements give a distance of 475 light-years (145.7 parsecs ).

The spectrum of this star matches a spectral class of K0III, ^[1] with the luminosity class III indicating it is a giant that has exhausted the hydrogen at its core. The star has a mass 1.51 times the mass of the Sun ^[3] and has expanded to 11.6 times the Sun's radius. It now radiates 60 times the Sun's luminosity from its photosphere ^[4] at an effective temperature of 4,853  K . ^[5] This temperature give it the orange hue typical of a K-type star. ^[7]

References

1. 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 .
2. 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 .
3. Anders, F.; Khalatyan, A.; Queiroz, A. B. A.; Chiappini, C.; Ardèvol, J.; Casamiquela, L.; Figueras, F.; Jiménez-Arranz, Ó.; Jordi, C.; Monguió, M.; Romero-Gómez, M.; Altamirano, D.; Antoja, T.; Assaad, R.; Cantat-Gaudin, T.; Castro-Ginard, A.; Enke, H.; Girardi, L.; Guiglion, G.; Khan, S.; Luri, X.; Miglio, A.; Minchev, I.; Ramos, P.; Santiago, B. X.; Steinmetz, M. (2022). "Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia EDR3 stars brighter than G = 18.5". Astronomy and Astrophysics. 658: A91. arXiv: 2111.01860 . Bibcode:2022A&A...658A..91A. doi:10.1051/0004-6361/202142369.
4. McDonald, I.; Zijlstra, A. A.; Watson, R. A. (2017). "Fundamental parameters and infrared excesses of Tycho-Gaia stars". Monthly Notices of the Royal Astronomical Society. 471 (1): 770. arXiv: 1706.02208 . Bibcode:2017MNRAS.471..770M. doi: 10.1093/mnras/stx1433 .
5. Huson, Dylan; Cowan, Indiana; Sizemore, Logan; Kounkel, Marina; Hutchinson, Brian (2025). "Gaia Net: Toward Robust Spectroscopic Parameters of Stars of all Evolutionary Stages". The Astrophysical Journal. 984 (1): 58. arXiv: 2503.02958 . Bibcode:2025ApJ...984...58H. doi: 10.3847/1538-4357/adc2fa .
6. "HD 40235". SIMBAD . Centre de données astronomiques de Strasbourg.
7. "The Colour of Stars". Australia Telescope, Outreach and Education. Commonwealth Scientific and Industrial Research Organisation. December 21, 2004. Archived from the original on 2013-12-03. Retrieved 2012-01-16.