HD 4313

HD 4313
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Pisces
Right ascension 00h 45m 40.3578s[1]
Declination +07° 50′ 42.075″[1]
Apparent magnitude (V) 7.83[2]
Characteristics
Evolutionary stage Subgiant[3]
Spectral type K2 IV[citation needed]
B−V color index 0.963±0.017[2]
Astrometry
Radial velocity (Rv)14.48±0.23[2] km/s
Proper motion (μ) RA: −6.281 mas/yr[1]
Dec.: 6.566 mas/yr[1]
Parallax (π)7.3090 ± 0.0879 mas[1]
Distance446 ± 5 ly
(137 ± 2 pc)
Absolute magnitude (MV)2.17[2]
Details
Mass1.61+0.13
−0.12[4] M☉
Radius5.15+0.18
−0.17[5] R☉
Luminosity15.81[2] L☉
Surface gravity (log g)3.24[6] cgs
Temperature4,966±40[5] K
Metallicity [Fe/H]0.05±0.10[5] dex
Rotational velocity (v sin i)1.91±0.25[6] km/s
Age2.03+0.64
−0.45[5] Gyr
Other designations
BD+07°104, Gaia DR2 2557541493057378048, HD 4313, HIP 3574, 2MASS J00454035+0750421[7]
Database references
SIMBADdata

HD 4313 is a star with an orbiting exoplanetary companion in the constellation of Pisces. It has an apparent visual magnitude of 7.83,[2] which is too faint to be reading visible to the unaided eye. The systam is located at a distance of 446 light years based on parallax, and is drifting further away with a radial velocity of 14.5 km/s.[2] This is a single star, which means it has no binary partners, at least in range of projected separations from 6.85 to 191.78 AU.[8] It hosts an extrasolar planet.

This is an aging K-type star with a mass of nearly twice the Sun, although different methods give mass estimates which differ as much as 0.5 M☉.[5] It is a swollen star with 5.14 times the radius of the Sun, and has a cool effective temperature of 4,966±40 k. The "IV" in the spectral class means it's a K-type subgiant[3] star which has exhausted the hydrogen at its core, and cooling and expanding to become a red giant. It is around two billion years in age and is spinning with a projected rotational velocity of 1.9 km/s.

  1. ^ a b c d Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
  2. ^ a b c d e f g 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 Cite error: The named reference Luhn_et_al_2019 was invoked but never defined (see the help page).
  4. ^ Malla, Sai Prathyusha; Stello, Dennis; Huber, Daniel; Montet, Benjamin T.; Bedding, Timothy R.; Fredslund Andersen, Mads; Grundahl, Frank; Jessen-Hansen, Jens; Hey, Daniel R.; Palle, Pere L.; Deng, Licai; Zhang, Chunguang; Chen, Xiaodian; Lloyd, James; Antoci, Victoria (2020). "Asteroseismic masses of four evolved planet-hosting stars using SONG and TESS: Resolving the retired A-star mass controversy". Monthly Notices of the Royal Astronomical Society. 496 (4): 5423–5435. arXiv:2006.07649. doi:10.1093/mnras/staa1793.
  5. ^ a b c d e North, Thomas S. H.; Campante, Tiago L.; Miglio, Andxsrea; Davies, Guy R.; Grunblatt, Samuel K.; Huber, Daniel; Kuszlewicz, James S.; Lund, Mikkel N.; Cooke, Benjamin F.; Chaplin, William J. (2017). "The masses of retired a stars with asteroseismology: Kepler and K2 observations of exoplanet hosts". Monthly Notices of the Royal Astronomical Society. 472 (2): 1866–1878. arXiv:1708.00716. doi:10.1093/mnras/stx2009.
  6. ^ a b "Exoplanet Archive". exoplanetarchive.ipac.caltech.edu. Retrieved 2020-12-11.
  7. ^ "HD 4313". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2023-12-11.
  8. ^ Wittrock, Justin M.; Kane, Stephen R.; Horch, Elliott P.; Howell, Steve B.; Ciardi, David R.; Everett, Mark E. (2017). "Exclusion of Stellar Companions to Exoplanet Host Stars". The Astronomical Journal. 154 (5): 184. arXiv:1709.05315. Bibcode:2017AJ....154..184W. doi:10.3847/1538-3881/aa8d69. S2CID 55789971.