HD 22781

HD 22781
Observation data
Epoch J2000      Equinox J2000
Constellation Perseus
Right ascension 03h 40m 49.5246s[1]
Declination +31° 49′ 34.6489″[1]
Apparent magnitude (V) 8.78[2]
Characteristics
Evolutionary stage main-sequence star[3]
Spectral type K0[2]
Astrometry
Radial velocity (Rv)8.26[1] km/s
Proper motion (μ) RA: 40.576[1] mas/yr
Dec.: −94.254[1] mas/yr
Parallax (π)30.6433 ± 0.1071 mas[4]
Distance106.4 ± 0.4 ly
(32.6 ± 0.1 pc)
Details[5]
Mass0.75±0.02 M☉
Radius0.70±0.02 R☉
Surface gravity (log g)4.57±0.04 cgs
Temperature5175±15 K
Metallicity [Fe/H]−0.35±0.02 dex
Rotational velocity (v sin i)1.73[3] km/s
Age4.14±3.63 Gyr
Other designations
BD+31 630, Gaia DR2 217334764042444288, HD 22781, HIP 17187, TYC 2355-246-1, GSC 02355-00246, 2MASS J03404953+3149345[1]
Database references
SIMBADdata

HD 22781, is a single star about 106 light-years away. It is a K-type main-sequence star. The star’s age is poorly constrained at 4.14±3.63 billion years, but is likely similar to that of the Sun.[5] HD 22781 is heavily depleted in heavy elements, having just 45% of Sun's concentration of iron,[2] yet is comparatively rich in carbon, having 90% of Sun`s abundance.[5]

An imaging survey in 2012 has failed to find any stellar companions, suggesting HD 22781 is a single star.[6]

  1. ^ a b c d e f Cite error: The named reference simbad was invoked but never defined (see the help page).
  2. ^ a b c Maldonado, J.; Villaver, E.; Eiroa, C.; Micela, G. (2019), "Connecting substellar and stellar formation. The role of the host star's metallicity", Astronomy & Astrophysics, 624: A94, arXiv:1903.01141, Bibcode:2019A&A...624A..94M, doi:10.1051/0004-6361/201833827, S2CID 118934484
  3. ^ a b Cite error: The named reference Diaz2011 was invoked but never defined (see the help page).
  4. ^ 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.
  5. ^ a b c Maldonado, J.; Villaver, E. (2017), "Searching for chemical signatures of brown dwarf formation", Astronomy & Astrophysics, 602: A38, arXiv:1702.02904, Bibcode:2017A&A...602A..38M, doi:10.1051/0004-6361/201630120, S2CID 56225222
  6. ^ Ginski, C.; Mugrauer, M.; Seeliger, M.; Eisenbeiss, T. (2012), "A lucky imaging multiplicity study of exoplanet host stars", Monthly Notices of the Royal Astronomical Society, 421 (3): 2498–2509, arXiv:1202.4586, Bibcode:2012MNRAS.421.2498G, doi:10.1111/j.1365-2966.2012.20485.x, S2CID 118573795