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HD 3765

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HD 3765
Image of the Andromeda Galaxy
View of the Andromeda Galaxy, with HD 3765 circled in red. The star is much closer than Andromeda, within the Milky Way galaxy.
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. XHIP record for this object at VizieR.
  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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