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HD 3765

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HD 3765
Observation data
Epoch J2000      Equinox J2000
Constellation Andromeda[1]
Right ascension 00h 40m 49.270s[2]
Declination +40° 11′ 13.82″[2]
Apparent magnitude (V) 7.34[3]
Characteristics
Evolutionary stage Main sequence[3]
Spectral type K2V[4]
Astrometry
Radial velocity (Rv)−63.33±0.12[2] km/s
Proper motion (μ) RA: 356.318 mas/yr[2]
Dec.: −669.205 mas/yr[2]
Parallax (π)55.8412±0.0235 mas[2]
Distance58.41 ± 0.02 ly
(17.908 ± 0.008 pc)
Absolute magnitude (MV)6.16[3]
Details
Mass0.852+0.020
−0.044[5] M☉
Radius0.79±0.02[5] R☉
Luminosity0.383±0.011[6] L☉
Surface gravity (log g)4.58±0.03[5] cgs
Temperature5076+115
−160[6] K
Metallicity [Fe/H]0.25[3] dex
Rotational velocity (v sin i)2[3] km/s
Other designations
BD+39 154, GJ 28, HD 3765, HIP 3206, SAO 54074, LHS 1125, Wolf 12[7]
Database references
SIMBADdata
Exoplanet Archivedata

HD 3765 is a single K-type main-sequence star in the constellation of Andromeda, near the Andromeda Galaxy in the sky. Its surface temperature is about 5076 K.[6] HD 3765 has an orange hue and is too faint to be seen with the naked eye, but can be seen with a small telescope.[8] It has an apparent visual magnitude of 7.34. Based upon parallax measurements, it is located 58.4 light-years from the Sun. The object is drifting towards the Sun with a radial velocity of −63.3 km/s.[2]

Planetary system

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HD 3765 has one known exoplanet, discovered in 2021 by the radial velocity method.[9] Prior to this discovery, it had been used as a radial velocity standard star.[10] The planet, HD 3765 b, orbits with a period of 3.3 years at a distance of 2.1 AU, and is not in the habitable zone. It is a gas giant with a minimum mass of 0.173 Jupiter masses,[9] and a predicted radius 0.764 times that of Jupiter.[11]

During observations of the variable star EG Andromedae in 1971, a possible eclipse of HD 3765 (which was used as a comparison star) was observed. It was proposed that this might be due to a transiting planet the size of Jupiter. The presence of eclipses has not been confirmed, and the observation could have been due to intrinsic variability, or in error.[12]

The HD 3765 planetary system[9]
Companion
(in order from star) 		Mass Semimajor axis
(AU) 		Orbital period
(days) 		Eccentricity Inclination Radius
b ≥0.173+0.014
−0.013 MJ 		2.108+0.032
−0.033 		1211+15
−16 		0.298+0.078
−0.071 		— —

See also

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References

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  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.
  2. ^ a b c d e f 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. ^ a b c d e Nordström, B.; Mayor, M.; Andersen, J.; Holmberg, J.; Pont, F.; Jørgensen, B. R.; Olsen, E. H.; Udry, S.; Mowlavi, N. (May 2004). "The Geneva-Copenhagen survey of the Solar neighbourhood. Ages, metallicities, and kinematic properties of ∼14 000 F and G dwarfs". Astronomy and Astrophysics. 418: 989–1019. arXiv:astro-ph/0405198. Bibcode:2004A&A...418..989N. doi:10.1051/0004-6361:20035959. ISSN 0004-6361.
  4. ^ Keenan, Philip C.; McNeil, Raymond C. (October 1989). "The Perkins Catalog of Revised MK Types for the Cooler Stars". Astrophysical Journal Supplement. 71: 245. Bibcode:1989ApJS...71..245K. doi:10.1086/191373.
  5. ^ a b c Takeda, Genya; Ford, Eric B.; et al. (February 2007). "Structure and Evolution of Nearby Stars with Planets. II. Physical Properties of ~1000 Cool Stars from the SPOCS Catalog". The Astrophysical Journal Supplement Series. 168 (2): 297–318. arXiv:astro-ph/0607235. Bibcode:2007ApJS..168..297T. doi:10.1086/509763.
  6. ^ a b c Stassun, Keivan G.; Oelkers, Ryan J.; Paegert, Martin; Torres, Guillermo; Pepper, Joshua; Lee, Nathan De; Collins, Kevin; Latham, David W.; Muirhead, Philip S.; Chittidi, Jay; Rojas-Ayala, Bárbara; Fleming, Scott W.; Rose, Mark E.; Tenenbaum, Peter; Ting, Eric B. (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. ISSN 1538-3881.
  7. ^ "HD 3765". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2025-04-23.
  8. ^ "★ HD 3765". Stellar Catalog. Retrieved 2025-04-22.
  9. ^ a b c Rosenthal, Lee J.; Fulton, Benjamin J.; et al. (July 2021). "The California Legacy Survey. I. A Catalog of 178 Planets from Precision Radial Velocity Monitoring of 719 Nearby Stars over Three Decades". The Astrophysical Journal Supplement Series. 255 (1): 8. arXiv:2105.11583. Bibcode:2021ApJS..255....8R. doi:10.3847/1538-4365/abe23c.
  10. ^ Tran, Quang H.; Bowler, Brendan P.; et al. (April 2021). "The Epoch of Giant Planet Migration Planet Search Program. I. Near-infrared Radial Velocity Jitter of Young Sun-like Stars". The Astronomical Journal. 161 (4): 173. arXiv:2101.11005. Bibcode:2021AJ....161..173T. doi:10.3847/1538-3881/abe041.
  11. ^ "HD 3765 b - NASA Science". 2021-06-17. Retrieved 2025-04-22.
  12. ^ Dworak, T. Z. (1979). "The star HD 3765: eclipsing binary or eclipsing planetary?". Acta Astronomica. 29: 151–155. Bibcode:1979AcA....29..151D.
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