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HD 111031
Observation data
Epoch J2000.0       Equinox J2000.0
Constellation Corvus
Right ascension 12h 46m 30.842066s [1]
Declination −11° 48′ 44.790199″ [1]
Apparent magnitude (V) 6.87 [2]
Spectral type G5 V [3]
B−V color index 0.695±0.001 [2]
Radial velocity (Rv)−20.24±0.12 [1] km/s
Proper motion (μ) RA: −279.627±0.024  mas/ yr [1]
Dec.: 46.791±0.019  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]
Details [4]
[5]  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
Other designations
50 G. Corvi, BD−11° 3361, GJ 3746, HD 111031, HIP 62345, SAO 157502, LTT 4887 [6]
Database references

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. [7]

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. [4]

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. [8] 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. [9]

In 2022, the presence of a brown dwarf companion to this star was confirmed. It has a mass of 54.167+5.319
, and orbits at a distance of 13.101+0.750
with a period of 46.740+3.194
. [10]


  1. ^ a b c d e f Vallenari, A.; et al. (Gaia Collaboration) (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. arXiv: 2208.00211. doi: 10.1051/0004-6361/202243940. Gaia DR3 record for this source at VizieR.
  2. ^ a b c d e 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. S2CID  119257644.
  3. ^ a b c Gray, R. O.; et al. (2003). "Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 parsecs: The Northern Sample I". The Astronomical Journal. 126 (4): 2048–2059. arXiv: astro-ph/0308182v1. Bibcode: 2003AJ....126.2048G. doi: 10.1086/378365. S2CID  119417105.
  4. ^ a b Soto, M. G.; Jenkins, J. S. (2018). "Spectroscopic Parameters and atmosphEric ChemIstriEs of Stars (SPECIES). I. Code description and dwarf stars catalogue". Astronomy and Astrophysics. 615: A76. arXiv: 1801.09698. Bibcode: 2018A&A...615A..76S. doi: 10.1051/0004-6361/201731533. S2CID  119107228.
  5. ^ 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.
  6. ^ "HD 111031". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2021-10-01.
  7. ^ Luyten, W. J. (June 1995). NLTT Catalogue. VizieR On-line Data Catalog: I/98A. Originally published in: Bibcode: 1995yCat.1098....0L.
  8. ^ Gonzales, Erica J.; et al. (April 2020), "The TRENDS High-contrast Imaging Survey. VIII. Compendium of Benchmark Objects", The Astrophysical Journal, 893 (1): 27, arXiv: 2010.11866, Bibcode: 2020ApJ...893...27G, doi: 10.3847/1538-4357/ab71fb, S2CID  216296289, 27
  9. ^ Dalba, Paul A.; et al. (March 2021). "Speckle Imaging Characterization of Radial Velocity Exoplanet Systems". The Astronomical Journal. 161 (3): 11. arXiv: 2012.05253. Bibcode: 2021AJ....161..123D. doi: 10.3847/1538-3881/abd6ed. S2CID  228083864. 123.
  10. ^ Feng, Fabo; Butler, R. Paul; et al. (August 2022). "3D Selection of 167 Substellar Companions to Nearby Stars". The Astrophysical Journal Supplement Series. 262 (21): 21. arXiv: 2208.12720. Bibcode: 2022ApJS..262...21F. doi: 10.3847/1538-4365/ac7e57. S2CID  251864022.