HD 88218

HD 88218
Observation data
Epoch J2000.0      Equinox ICRS
Constellation Antlia
Right ascension 10h 09m 31.7681s
Declination −35° 51′ 24.404″
Apparent magnitude (V) 6.14
Characteristics
Evolutionary stage subgiant
Spectral type G0 V
U−B color index +0.16
B−V color index +0.6
Astrometry
Radial velocity (Rv)36.7±0.1 km/s
Proper motion (μ) RA: −445.632 mas/yr
Dec.: +18.774 mas/yr
Parallax (π)31.5137±0.0307 mas
Distance103.5 ± 0.1 ly
(31.73 ± 0.03 pc)
Absolute magnitude (MV)+3.64
Orbit
Period (P)268+92
−56 yr
Semi-major axis (a)51+12
−8 au
Eccentricity (e)0.611+0.055
−0.098
Inclination (i)57.21+0.65
−0.60°
Details
A
Mass1.268+0.064
−0.063 M☉
Radius1.66 R☉
Luminosity2.88 L☉
Surface gravity (log g)4.03±0.03 cgs
Temperature5,878±14 K
Metallicity [Fe/H]−0.14±0.01 dex
Rotational velocity (v sin i)3 km/s
Age6.8+0.49
−0.41 Gyr
B
Mass0.617+0.064
−0.057 M☉
Other designations
49 G. Antliae, CD−35°6194, CPD−35°3974, FK5 2816, GJ 379.1, HD 88218, HIP 49769, HR 3992, SAO 201109, WDS J10095-3551AB
Database references
SIMBADdata

HD 88218 (HR 3992) is a binary star in the southern constellation Antlia. The system has a combined apparent magnitude of 6.14, making it faintly visible to the naked eye. HD 88218 is relatively close at a distance of 103 light years but is receding with a heliocentric radial velocity of 36.7 km/s.

The visible component has a stellar classification of G0 V, indicating the object's status as a solar analogue. As for the companion, it is probably a K-type star[citation needed] based on a mass of 0.62 M☉. The stars have an orbital period of 270 years (albeit with great uncertainty) a semi-major axis of 50 astronomical units and an eccentricity of 0.61.

Despite the class described above, the primary is starting to evolve off the main sequence at the age of 6.8 billion years, having a low surface gravity and a slightly enlarged radius of 1.66 R☉, with the addition of being chromospherically inactive. Nevertheless, it has 107% the mass of the Sun and radiates at 2.88 times the luminosity of the Sun from its photosphere at an effective temperature of 5,870 K, giving a yellow glow. HD 88218 A has an iron abundance 72% that of the Sun and spins leisurely with a projected rotational velocity of 3 km/s.

References

  1. 1 2 3 4 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. 1 2 3 4 5 6 7 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. 1 2 Gray, R. O.; Corbally, C. J.; Garrison, R. F.; McFadden, M. T.; Bubar, E. J.; McGahee, C. E.; O'Donoghue, A. A.; Knox, E. R. (2 June 2006). "Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 pc--The Southern Sample". The Astronomical Journal. 132 (1): 161–170. arXiv:astro-ph/0603770. Bibcode:2006AJ....132..161G. doi:10.1086/504637. eISSN 1538-3881. ISSN 0004-6256.
  4. 1 2 Johnson, H. L.; Mitchell, R. I.; Iriarte, B.; Wisniewski, W. Z. (1966). "UBVRIJKL Photometry of the Bright Stars". Communications of the Lunar and Planetary Laboratory. 4: 99–110. Bibcode:1966CoLPL...4...99J.
  5. 1 2 Nidever, David L.; Marcy, Geoffrey W.; Butler, R. Paul; Fischer, Debra A.; Vogt, Steven S. (August 2002). "Radial Velocities for 889 Late-Type Stars". The Astrophysical Journal Supplement Series. 141 (2): 503–522. arXiv:astro-ph/0112477. Bibcode:2002ApJS..141..503N. doi:10.1086/340570. eISSN 1538-4365. ISSN 0067-0049.
  6. 1 2 3 4 5 An, Qier; Brandt, Timothy D.; Brandt, G. Mirek; Venner, Alexander (October 2025). "Orbits and Masses for 156 Companions from Combined Astrometry and Radial Velocities, and a Validation of Gaia Non-single-star Solutions". The Astrophysical Journal Supplement Series. 280 (2): 61. arXiv:2508.08374. Bibcode:2025ApJS..280...61A. doi:10.3847/1538-4365/adfa99. ISSN 0067-0049.
  7. 1 2 3 4 McDonald, I.; Zijlstra, A. A.; Watson, R. A. (15 June 2017). "Fundamental parameters and infrared excesses of Tycho–Gaia stars". Monthly Notices of the Royal Astronomical Society. 471 (1): 770–791. arXiv:1706.02208. Bibcode:2017MNRAS.471..770M. doi:10.1093/mnras/stx1433. eISSN 1365-2966. ISSN 0035-8711.
  8. 1 2 3 4 5 6 Sousa, S. G.; Santos, N. C.; Mayor, M.; Udry, S.; Casagrande, L.; Israelian, G.; Pepe, F.; Queloz, D.; Monteiro, M. J. P. F. G. (4 June 2008). "Spectroscopic parameters for 451 stars in the HARPS GTO planet search program". Astronomy & Astrophysics. 487 (1): 373–381. arXiv:0805.4826. Bibcode:2008A&A...487..373S. doi:10.1051/0004-6361:200809698. eISSN 1432-0746. ISSN 0004-6361.
  9. 1 2 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 & Astrophysics. 418 (3): 989–1019. arXiv:astro-ph/0405198. Bibcode:2004A&A...418..989N. doi:10.1051/0004-6361:20035959. ISSN 0004-6361.
  10. ↑ Aguilera-Gómez, Claudia; Ramírez, Iván; Chanamé, Julio (June 2018). "Lithium abundance patterns of late-F stars: an in-depth analysis of the lithium desert". Astronomy & Astrophysics. 614: A55. arXiv:1803.05922. Bibcode:2018A&A...614A..55A. doi:10.1051/0004-6361/201732209. eISSN 1432-0746. ISSN 0004-6361.
  11. ↑ Gould, Benjamin Apthorp (1878). "Uranometria Argentina : brillantez y posicion de las estrellas fijas, hasta la septima magnitud, comprendidas dentro de cien grados del polo austral : con atlas". Resultados del Observatorio Nacional Argentino. 1. Bibcode:1879RNAO....1.....G.
  12. ↑ "HR 3992". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved July 17, 2022.
  13. ↑ Gomes da Silva, J.; Santos, N. C.; Adibekyan, V.; Sousa, S. G.; Campante, T. L.; Figueira, P.; Bossini, D.; Delgado-Mena, E.; Monteiro, M. J. P. F. G.; de Laverny, P.; Recio-Blanco, A.; Lovis, C. (February 2021). "Stellar chromospheric activity of 1674 FGK stars from the AMBRE-HARPS sample". Astronomy & Astrophysics. 646: A77. arXiv:2012.10199. Bibcode:2021A&A...646A..77G. doi:10.1051/0004-6361/202039765. eISSN 1432-0746. ISSN 0004-6361.