HD 111031

HD 111031
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Corvus
Right ascension 12h 46m 30.84207s[1]
Declination −11° 48′ 44.7902″[1]
Apparent magnitude (V) 6.87[2]
Characteristics
Spectral type G5 V[3]
B−V color index 0.695±0.001[2]
Astrometry
Radial velocity (Rv)−20.24±0.12[1] km/s
Proper motion (μ) RA: −279.627(24) mas/yr[1]
Dec.: 46.791(19) mas/yr[1]
Parallax (π)32.0310 ± 0.0219 mas[1]
Distance101.83 ± 0.07 ly
(31.22 ± 0.02 pc)
Absolute magnitude (MV)4.42[2]
Orbit[4]
Semi-major axis (a)21.1±0.6 AU
Eccentricity (e)0.71±0.01
Inclination (i)137+4
−3
°
Longitude of the node (Ω)325+2
−1
°
Argument of periastron (ω)
(secondary)
42+3
−2
°
Details[5]
HD 111031 A
Mass1.127+0.034
−0.041
 M
Radius1.274+0.024
−0.018
 R
Luminosity1.510+0.004
−0.003
[6] L
Surface gravity (log g)4.459±0.315 cgs
Temperature5,836±50 K
Metallicity [Fe/H]0.330±0.105 dex
Rotational velocity (v sin i)1.728±0.273 km/s
Age5.036+1.124
−1.092
 Gyr
HD 111031 B
Mass0.129±0.003[4] M
Other designations
50 G. Corvi, BD−11° 3361, GJ 3746, HD 111031, HIP 62345, SAO 157502, LTT 4887[7]
Database references
SIMBADdata

HD 111031 (50 G. Corvi) is a double star in the southern constellation of Corvus. With an apparent visual magnitude of 6.87,[2] it is considered too faint to be readily visible to the naked eye. The distance to this star is 102 light years, but it is drifting closer to the Sun with a radial velocity of −20 km/s.[1] It has an absolute magnitude of 4.42.[2] The star has a relatively large proper motion, traversing the celestial sphere at an angular rate of 0.289 arcsec yr−1.[8]

This object is a solar analog with a stellar classification of G5 V;[3] a G-type main-sequence star like the Sun that is generating energy through core hydrogen fusion. It is around five billion years old and is chromospherically inactive,[3] with a projected rotational velocity of 1.7 km/s. The star has 1.13 times the mass and 1.27 times the radius of the Sun. It is radiating 1.5 times the Sun's luminosity from its photosphere at an effective temperature of 5,836 K.[5]

In 2020, a stellar companion was identified using high-contrast imaging. The study authors deem this most likely a K-type main-sequence star with a class of K5V, an angular separation of 1 along a position angle (PA) of 300° corresponding to a projected separation of 30 AU, and around 11–15% of the mass of the Sun.[9] An independent study published in 2021 identified a companion through speckle imaging. They propose this is a faint red dwarf with a class of M6 or later and a visual magnitude difference of 7.9 or more compared to the primary. It is located at a separation of 1.06 along a PA of 121°, as of 2021.[10]

A 2022 study claimed the presence of a brown dwarf companion to this star based on radial velocity and astrometry observations,[11] but according to a 2023 follow-up study this was in fact a detection of the previously known stellar companion, poorly characterized due to the baseline of observations being much shorter than the companion's orbital period.[4]

  1. ^ a b c d e f Cite error: The named reference GaiaDR3 was invoked but never defined (see the help page).
  2. ^ a b c d e Cite error: The named reference Anderson_Francis_2012 was invoked but never defined (see the help page).
  3. ^ a b c Cite error: The named reference Gray_et_al_2003 was invoked but never defined (see the help page).
  4. ^ a b c Cite error: The named reference Philipot2023 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Soto_Jenkins_2018 was invoked but never defined (see the help page).
  6. ^ Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  7. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference Luyten1995 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Gonzales_et_al_2020 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Dalba_et_al_2021 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference Feng2022 was invoked but never defined (see the help page).