HD 177830

HD 177830
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Lyra
Right ascension 19h 05m 20.7732s[1]
Declination +25° 55′ 14.373″[1]
Apparent magnitude (V) 7.175
Characteristics
Spectral type K0IV[2]/M4V[3]
Astrometry
Radial velocity (Rv)−71.86 ± 0.06[4] km/s
Proper motion (μ) RA: −41.248(12) mas/yr[1]
Dec.: −52.580(17) mas/yr[1]
Parallax (π)16.0063 ± 0.0165 mas[1]
Distance203.8 ± 0.2 ly
(62.48 ± 0.06 pc)
Details
Mass1.48[5] M☉
Radius2.99[5] R☉
Surface gravity (log g)4.03[5] cgs
Temperature4948[5] K
Metallicity [Fe/H]0.55 ± 0.03[6] dex
Rotational velocity (v sin i)2.54[5] km/s
Age4.4 ± 2.2[6] Gyr
Other designations
BD+25°3719, Gliese 743.2, HIP 93746, GSC 02126-01196, SAO 86791.[7]
Database references
SIMBADdata

HD 177830 is a 7th magnitude binary star system located approximately 205 light-years away in the constellation of Lyra. The primary star is slightly more massive than the Sun, but cooler being a type K star. Therefore, it is a subgiant clearly more evolved than the Sun. In visual light it is four times brighter than the Sun, but because of its distance, about 204 light years, it is not visible to the unaided eye. With binoculars it should be easily visible.

The primary star is known to have two extrasolar planets orbiting around it.

  1. ^ a b c d Cite error: The named reference Gaia DR3 was invoked but never defined (see the help page).
  2. ^ Cite error: The named reference Vogt2000 was invoked but never defined (see the help page).
  3. ^ Cite error: The named reference Roberts2015 was invoked but never defined (see the help page).
  4. ^ Jofré, E.; Petrucci, R.; Saffe, C.; Saker, L.; Artur de la Villarmois, E.; Chavero, C.; Gómez, M.; Mauas, P. J. D. (2015). "Stellar parameters and chemical abundances of 223 evolved stars with and without planets". Astronomy & Astrophysics. 574: A50. arXiv:1410.6422. Bibcode:2015A&A...574A..50J. doi:10.1051/0004-6361/201424474. S2CID 53666931.
  5. ^ a b c d e Fischer, Debra A.; Valenti, Jeff (2005). "The Planet-Metallicity Correlation". The Astrophysical Journal. 622 (2): 1102. Bibcode:2005ApJ...622.1102F. doi:10.1086/428383.
  6. ^ a b Cite error: The named reference Meschiari2011 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).