Astronomy:HD 88218
| Observation data Epoch J2000.0 Equinox (celestial coordinates) | |
|---|---|
| Constellation | Antlia |
| Right ascension | 10h 09m 31.7681s[1] |
| Declination | −35° 51′ 24.4042″[1] |
| Apparent magnitude (V) | 6.14[2] |
| Characteristics | |
| Spectral type | G0 V[3] |
| U−B color index | +0.16[4] |
| B−V color index | +0.6[4] |
| Astrometry | |
| Radial velocity (Rv) | 36.7±0.1[5] km/s |
| Proper motion (μ) | RA: −445.632[1] mas/yr Dec.: +18.774[1] mas/yr |
| Parallax (π) | 31.5137 ± 0.0307[1] mas |
| Distance | 103.5 ± 0.1 ly (31.73 ± 0.03 pc) |
| Absolute magnitude (MV) | +3.64[2] |
| Details | |
| A | |
| Mass | 1.07±0.03[6] M☉ |
| Radius | 1.66[7] R☉ |
| Luminosity | 2.88[7] L☉ |
| Surface gravity (log g) | 4.03±0.03[8] cgs |
| Temperature | 5,878±14[8] K |
| Metallicity [Fe/H] | −0.14±0.01[8] dex |
| Rotational velocity (v sin i) | 3[9] km/s |
| Age | 6.8+0.49−0.41[10] Gyr |
| B | |
| Mass | 0.69[11] M☉ |
| Other designations | |
| Database references | |
| SIMBAD | data |
HD 88218 (HR 3992) is a binary star in the southern constellation Antlia. The system has a combined apparent magnitude of 6.14,[2] making it faintly visible to the naked eye. HD 88218 is relatively close at a distance of 103 light years[1] but is receding with a heliocentric radial velocity of 36.7 km/s.[5]
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 based on a mass of 0.69 M☉.[11] As of 2018, both stars have a projected separation of 700 mas along a position angle of 0°.[13] The system has an orbital period of 86.6 years.[11]
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[8] and a slightly enlarged radius of 1.66 R☉,[7] with the addition of being chromospherically inactive.[3] Nevertheless, it has 107% the mass of the Sun[6] and radiates at 2.88 times the luminosity of the Sun[7] from its photosphere at an effective temperature of 5,870 K,[8] giving a yellow glow. HD 88218 A has an iron abundance 72% that of the Sun[8] and spins leisurely with a projected rotational velocity of 3 km/s.[9]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 Brown, A. G. A. (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics 649: A1. doi:10.1051/0004-6361/202039657. Bibcode: 2021A&A...649A...1G. Gaia EDR3 record for this source at VizieR.
- ↑ 2.0 2.1 2.2 Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331–346. doi:10.1134/S1063773712050015. ISSN 1063-7737. Bibcode: 2012AstL...38..331A.
- ↑ 3.0 3.1 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. doi:10.1086/504637. ISSN 0004-6256. Bibcode: 2006AJ....132..161G.
- ↑ 4.0 4.1 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.
- ↑ 5.0 5.1 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. doi:10.1086/340570. ISSN 0067-0049. Bibcode: 2002ApJS..141..503N.
- ↑ 6.0 6.1 Gomes da Silva, J.; Santos, N. C.; Adibekyan, V.; Sousa, S. G.; Campante, T. L.; Figueira, P.; Bossini, D.; Delgado-Mena, E. et al. (February 2021). "Stellar chromospheric activity of 1674 FGK stars from the AMBRE-HARPS sample". Astronomy & Astrophysics 646: A77. doi:10.1051/0004-6361/202039765. ISSN 0004-6361. Bibcode: 2021A&A...646A..77G.
- ↑ 7.0 7.1 7.2 7.3 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. doi:10.1093/mnras/stx1433. ISSN 0035-8711. Bibcode: 2017MNRAS.471..770M.
- ↑ 8.0 8.1 8.2 8.3 8.4 8.5 Sousa, S. G.; Santos, N. C.; Mayor, M.; Udry, S.; Casagrande, L.; Israelian, G.; Pepe, F.; Queloz, D. et al. (4 June 2008). "Spectroscopic parameters for 451 stars in the HARPS GTO planet search program". Astronomy & Astrophysics 487 (1): 373–381. doi:10.1051/0004-6361:200809698. ISSN 0004-6361. Bibcode: 2008A&A...487..373S.
- ↑ 9.0 9.1 Nordström, B.; Mayor, M.; Andersen, J.; Holmberg, J.; Pont, F.; Jørgensen, B. R.; Olsen, E. H.; Udry, S. et al. (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. doi:10.1051/0004-6361:20035959. ISSN 0004-6361. Bibcode: 2004A&A...418..989N.
- ↑ 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. doi:10.1051/0004-6361/201732209. ISSN 0004-6361. Bibcode: 2018A&A...614A..55A.
- ↑ 11.0 11.1 11.2 Tokovinin, Andrei (14 March 2014). "From Binaries to Multiples. II. Hierarchical Multiplicity of F and G Dwarfs". The Astronomical Journal 147 (4): 87. doi:10.1088/0004-6256/147/4/87. ISSN 0004-6256. Bibcode: 2014AJ....147...87T.
- ↑ "HR 3992". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HR+3992.
- ↑ Mason, Brian D.; Wycoff, Gary L.; Hartkopf, William I.; Douglass, Geoffrey G.; Worley, Charles E. (December 2001). "The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog". The Astronomical Journal 122 (6): 3466–3471. doi:10.1086/323920. ISSN 0004-6256. Bibcode: 2001AJ....122.3466M.
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