HD 88218

HD 88218
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
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 mas/yr[1]
Dec.: +18.774 mas/yr[1]
Parallax (π)31.5137 ± 0.0307 mas[1]
Distance103.5 ± 0.1 ly
(31.73 ± 0.03 pc)
Absolute magnitude (MV)+3.64[2]
Details
A
Mass1.07±0.03[6] M☉
Radius1.66[7] R☉
Luminosity2.88[7] L☉
Surface gravity (log g)4.03±0.03[8] cgs
Temperature5,878±14[8] K
Metallicity [Fe/H]−0.14±0.01[8] dex
Rotational velocity (v sin i)3[9] km/s
Age6.8+0.49
−0.41[10] Gyr
B
Mass0.69[11] M☉
Other designations
49 G. Antliae[12], CD−35°6194, CPD−35°3974, FK5 2816, GJ 379.1, HD 88218, HIP 49796, HR 3992, SAO 201109, WDS J10095-3551AB[13]
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,[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°.[14] 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]

  1. ^ a b c d e Cite error: The named reference EDR3 was invoked but never defined (see the help page).
  2. ^ a b c Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Gray2006 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Johnson1966 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Nidever2002 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference Gomes da Silva2021 was invoked but never defined (see the help page).
  7. ^ a b c d Cite error: The named reference McDonald2017 was invoked but never defined (see the help page).
  8. ^ a b c d e f Cite error: The named reference Sousa2008 was invoked but never defined (see the help page).
  9. ^ a b Cite error: The named reference Nordstrom2004 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Aguilera-Gómez2018 was invoked but never defined (see the help page).
  11. ^ a b c Cite error: The named reference Tokovinin2014 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference Gould1879 was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  14. ^ Cite error: The named reference Mason2001 was invoked but never defined (see the help page).