HD 194612

Last updated
HD 194612
Observation data
Epoch J2000.0        Equinox J2000.0 (ICRS)
Constellation Octans
Right ascension 20h 38m 18.6064s [1]
Declination −81° 17′ 20.6261″ [1]
Apparent magnitude  (V)5.89±0.01 [2]
Characteristics
Evolutionary stage RGB [3]
Spectral type K5 III [4]
U−B color index +2.02 [5]
B−V color index +1.71 [5]
Astrometry
Radial velocity (Rv)0.3±0.4 [6]  km/s
Proper motion (μ)RA: +1.597  mas/yr [1]
Dec.: −37.819  mas/yr [1]
Parallax (π)4.3006 ± 0.0707  mas [1]
Distance 760 ± 10  ly
(233 ± 4  pc)
Absolute magnitude  (MV)−0.56 [7]
Details
Mass 2.1 [8]   M☉
Radius 59.9 [9]   R☉
Luminosity 598±13 [10]   L☉
Surface gravity (log g)0.99±0.02 [3]   cgs
Temperature 3941±122 [9]   K
Rotational velocity (v sin i)2.3±1.2 [11]  km/s
Other designations
49 G. Octantis [12] , CPD−81°906, GC  28578, HD  194612, HIP  101843, HR  7812, SAO  258864 [13]
Database references
SIMBAD data

HD 194612 (HR 7812) is a solitary [14] orange hued star located in the southern circumpolar constellation Octans. It has an apparent magnitude of 5.9, [2] making it visible to the naked eye under ideal conditions. Parallax measurements place it at a distance of 760 light years [1] and it has a low heliocentric radial velocity of 0.3  km/s . [6]

This is a red giant with a stellar classification of K5 III, [4] and Gaia DR3 stellar evolution models place it on the red giant branch. [3] It has double the mass of the Sun [8] and an enlarged radius of 59.9  R☉ [9] due to its evolved status. It shines with a luminosity of 598  L☉ [10] from its photosphere at an effective temperature of 3,941  K . [9] Like many giants, HD 194612 has a comparatively modest projected rotational velocity, which is around 2.3  km/s . [11]

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References

  1. 1 2 3 4 5 6 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. 1 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. 1 2 3 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.
  4. 1 2 Houk, N.; Cowley, A. P. (1975). University of Michigan Catalogue of two-dimensional spectral types for the HD stars. Volume I. Declinations −90° to −53°. Bibcode:1975mcts.book.....H.
  5. 1 2 Johnson, H. L.; Mitchell, R. I.; Iriarte, B.; Wisniewski, W. Z. (1966). "UBVRIJKL Photometry of the Bright Stars". Communications of the Lunar and Planetary Laboratory. 4: 99–110. Bibcode:1966CoLPL...4...99J.
  6. 1 2 Gontcharov, G. A. (November 2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv: 1606.08053 . Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. eISSN   1562-6873. ISSN   1063-7737. S2CID   119231169.
  7. ↑ 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. eISSN   1562-6873. ISSN   1063-7737. S2CID   119257644.
  8. 1 2 Kervella, Pierre; Arenou, Frédéric; Thévenin, Frédéric (2022). "Stellar and substellar companions from Gaia EDR3". Astronomy & Astrophysics. 657: A7. arXiv: 2109.10912 . Bibcode:2022A&A...657A...7K. doi: 10.1051/0004-6361/202142146 . eISSN   1432-0746. ISSN   0004-6361.
  9. 1 2 3 4 Stassun, Keivan G.; et al. (9 September 2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal. 158 (4): 138. arXiv: 1905.10694 . Bibcode:2019AJ....158..138S. doi: 10.3847/1538-3881/ab3467 . ISSN   0004-6256.
  10. 1 2 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.
  11. 1 2 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 & Astrophysics. 561: A126. arXiv: 1312.3474 . Bibcode:2014A&A...561A.126D. doi: 10.1051/0004-6361/201220762 . ISSN   0004-6361.
  12. ↑ Gould, B. A., Uranometria Argentina, Reprinted and updated by Pilcher, F, archived from the original on 2012-02-27, retrieved 2012-01-06
  13. ↑ "HR 7812". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved July 28, 2022.
  14. ↑ Eggleton, P. P.; Tokovinin, A. A. (11 September 2008). "A catalogue of multiplicity among bright stellar systems". Monthly Notices of the Royal Astronomical Society. 389 (2): 869–879. arXiv: 0806.2878 . Bibcode:2008MNRAS.389..869E. doi: 10.1111/j.1365-2966.2008.13596.x . eISSN   1365-2966. ISSN   0035-8711.
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