HD 28700

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HD 28700
Observation data
Epoch J2000      Equinox J2000
Constellation Caelum
Right ascension 04h 29m 20.09s[1]
Declination −46° 30′ 54.97″[1]
Apparent magnitude (V) 6.12±0.01[2]
Characteristics
Evolutionary stage red clump[citation needed]
Spectral type K1III[3]
B−V color index +1.06[4]
Astrometry
Radial velocity (Rv)11.50±0.13[1] km/s
Proper motion (μ) RA: 51.226±0.048[1] mas/yr
Dec.: 36.423±0.059[1] mas/yr
Parallax (π)8.4653 ± 0.0274[1] mas
Distance385 ± 1 ly
(118.1 ± 0.4 pc)
Absolute magnitude (MV)+0.69[5]
Details
Mass2.48+0.51
−1.57[6] M☉
Radius10.39+0.55
−1.03[1] R☉
Luminosity54.7±0.3[1] L☉
Surface gravity (log g)2.46[7] cgs
Temperature4,871+261
−125[1] K
Metallicity [Fe/H]0.00[6] dex
Rotational velocity (v sin i)<1[8] km/s
Other designations
5 G. Caeli, CD−46 1427, HD 28700, HIP 20934, HR 1433, SAO 216832
Database references
SIMBADdata

HD 28700 (HR 1433) is a solitary star in the southern constellation Caelum. With an apparent magnitude of 6.12, it's only visible to the naked eye under ideal conditions. The star is located 385 light-years (118 pc) based on parallax, but is drifting away with a radial velocity of 11.5 km/s.

Properties[]

HD 28700 has about 2.5 times the Sun's mass, but has expanded to 10.39 times the Sun's girth. It radiates at 54.7 times the Sun's luminosity from its swollen photosphere at an effective temperature of 4,871 K. HD 28700 has a slow projected rotational velocity that is too low to be measured accurately, with it being less than 1 km/s. HD 28700 has the same metal abundance as the Sun.

References[]

  1. ^ Jump up to: a b c d e f g h 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.
  2. ^ Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27–L30. Bibcode:2000A&A...355L..27H. ISSN 0004-6361.
  3. ^ Houk, Nancy (1978). Michigan catalogue of two-dimensional spectral types for the HD stars. Bibcode:1978mcts.book.....H.
  4. ^ ESA (1997). "The HIPPARCOS and TYCHO catalogues. Astrometric and photometric star catalogues derived from the ESA HIPPARCOS Space Astrometry Mission". ESA Special Publication. 1200. Bibcode:1997ESASP1200.....E. ISSN 1609-042X.
  5. ^ Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331–346. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. S2CID 119257644.
  6. ^ Jump up to: a b Charbonnel, C.; Lagarde, N.; Jasniewicz, G.; North, P. L.; Shetrone, M.; Krugler Hollek, J.; Smith, V. V.; Smiljanic, R.; Palacios, A.; Ottoni, G. (January 2020). "Lithium in red giant stars: Constraining non-standard mixing with large surveys in the Gaia era". Astronomy and Astrophysics. 633: A34. arXiv:1910.12732. Bibcode:2020A&A...633A..34C. doi:10.1051/0004-6361/201936360. ISSN 0004-6361. S2CID 204907220.
  7. ^ Anders, F.; Khalatyan, A.; Chiappini, C.; Queiroz, A. B.; Santiago, B. X.; Jordi, C.; Girardi, L.; Brown, A. G. A.; Matijevič, G.; Monari, G.; Cantat-Gaudin, T.; Weiler, M.; Khan, S.; Miglio, A.; Carrillo, I.; Romero-Gómez, M.; Minchev, I.; de Jong, R. S.; Antoja, T.; Ramos, P.; Steinmetz, M.; Enke, H. (August 2019). "Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia DR2 stars brighter than G = 18". Astronomy and Astrophysics. 628: A94. arXiv:1904.11302. Bibcode:2019A&A...628A..94A. doi:10.1051/0004-6361/201935765. ISSN 0004-6361. S2CID 131780028.
  8. ^ De Medeiros, J. R.; Alves, S.; Udry, S.; Andersen, J.; Nordström, B.; Mayor, M. (January 2014). "A catalog of rotational and radial velocities for evolved stars. V. Southern stars". Astronomy and Astrophysics. 561: A126. arXiv:1312.3474. Bibcode:2014A&A...561A.126D. doi:10.1051/0004-6361/201220762. ISSN 0004-6361. S2CID 54046583.
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