HD 194012

Last updated
HD 194012
Observation data
Epoch J2000.0        Equinox J2000.0 (ICRS)
Constellation Delphinus [1]
Right ascension 20h 22m 52.3692s [2]
Declination +14° 33′ 03.951″ [2]
Apparent magnitude  (V)6.15±0.01 [3]
Characteristics
Evolutionary stage main sequence [2]
Spectral type F7 V [4]
U−B color index −0.07 [5]
B−V color index +0.51 [5]
Astrometry
Radial velocity (Rv)4.5±0.2 [6] km/s
Proper motion (μ)RA: +78.997 mas/yr [2]
Dec.: −7.143 mas/yr [2]
Parallax (π)38.4009±0.0233  mas [2]
Distance 84.93 ± 0.05  ly
(26.04 ± 0.02  pc)
Absolute magnitude  (MV)+4.06 [1]
Details
Mass 1.21+0.19
−0.16 [7]   M☉
Radius 1.18±0.04 [7]   R☉
Luminosity 1.9 [8]   L☉
Surface gravity (log g)4.36 [8]   cgs
Temperature 6,301±80 [9]   K
Metallicity [Fe/H]−0.06 [8]   dex
Rotational velocity (v sin i)5 [10]  km/s
Age 1.06 [11]   Gyr
Other designations
AG+14°2196, BD+14°4275, GC 28343, GJ 789, HD 194012, HIP 100511, HR 7793, SAO 106042 [12]
Database references
SIMBAD data

HD 194012 (HR 7793; Gliese 789) is a star in the equatorial constellation Delphinus. It has an apparent magnitude of 6.15, [3] making it visible to the naked eye under ideal conditions. The star is relatively close at a distance of only 85 light years [2] but is receding with a heliocentric radial velocity of 4.5  km/s . [6]

HD 194012 has a stellar classification of F7 V, [4] indicating that it is an ordinary F-type main-sequence star. It has 121% the mass of the Sun [7] and is estimated to be a billion years old, [11] spinning with a projected rotational velocity of 5  km/s . [10] The star's diameter is 118% that of the Sun [7] and shines with a luminosity of 1.9  L☉ [8] from its photosphere at an effective temperature of 6,301  K , [9] giving a yellow white hue. HD 194012's metallicity is calculated to be 87% that of the Sun. [8]

A 2010 paper has identified a candidate substellar companion 12.78″ away along a position angle of 67.9° . [13] HD 194012 has been examined for infrared excess suggesting a debris disk but none was found. [14]

References

  1. 1 2 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. XHIP record for this object at VizieR.
  2. 1 2 3 4 5 6 7 Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv: 2208.00211 . Bibcode:2023A&A...674A...1G. doi: 10.1051/0004-6361/202243940 . S2CID   244398875. Gaia DR3 record for this source at VizieR.
  3. 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.
  4. 1 2 Gray, R. O.; Corbally, C. J.; Garrison, R. F.; McFadden, M. T.; Robinson, P. E. (October 2003). "Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 Parsecs: The Northern Sample. I." The Astronomical Journal. 126 (4): 2048–2059. arXiv: astro-ph/0308182 . Bibcode:2003AJ....126.2048G. doi: 10.1086/378365 . eISSN   1538-3881. ISSN   0004-6256.
  5. 1 2 Marlborough, J. M. (March 1964). "Frequency of ultraviolet excess among late-type dwarfs in the solar neighbourhood". The Astronomical Journal. 69: 215. Bibcode:1964AJ.....69..215M. doi: 10.1086/109258 . ISSN   0004-6256.
  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. ISSN   1063-7737. S2CID   119231169.
  7. 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.
  8. 1 2 3 4 5 Luck, R. Earle (21 December 2016). "Abundances in the Local Region. II. F, G, and K Dwarfs and Subgiants". The Astronomical Journal. 153 (1): 21. arXiv: 1611.02897 . Bibcode:2017AJ....153...21L. doi: 10.3847/1538-3881/153/1/21 . eISSN   1538-3881.
  9. 1 2 Casagrande, L.; Schönrich, R.; Asplund, M.; Cassisi, S.; Ramírez, I.; Meléndez, J.; Bensby, T.; Feltzing, S. (June 2011). "New constraints on the chemical evolution of the solar neighbourhood and Galactic disc(s): Improved astrophysical parameters for the Geneva-Copenhagen Survey⋆". Astronomy & Astrophysics. 530: A138. arXiv: 1103.4651 . Bibcode:2011A&A...530A.138C. doi: 10.1051/0004-6361/201016276 . ISSN   0004-6361.
  10. 1 2 Kraft, Robert P. (November 1967). "Studies of Stellar Rotation. V. The Dependence of Rotation on Age among Solar-Type Stars". The Astrophysical Journal. 150: 551. Bibcode:1967ApJ...150..551K. doi: 10.1086/149359 . eISSN   1538-4357. ISSN   0004-637X.
  11. 1 2 Demarque, Pierre; Woo, Jong-Hak; Kim, Yong-Cheol; Yi, Sukyoung K. (December 2004). "Y 2 Isochrones with an Improved Core Overshoot Treatment". The Astrophysical Journal Supplement Series. 155 (2): 667–674. arXiv: astro-ph/0409024 . Bibcode:2004ApJS..155..667D. doi: 10.1086/424966 . ISSN   1538-4357.
  12. ↑ "HD 194012". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved June 16, 2022.
  13. ↑ Tanner, Angelle M.; Gelino, Christopher R.; Law, Nicholas M. (October 2010). "A High-Contrast Imaging Survey ofSIM LitePlanet Search Targets". Publications of the Astronomical Society of the Pacific. 122 (896): 1195–1206. arXiv: 1007.4315 . Bibcode:2010PASP..122.1195T. doi: 10.1086/656481 . eISSN   1538-3873. ISSN   0004-6280.
  14. ↑ Gáspár, András; Rieke, George H.; Ballering, Nicholas (29 July 2016). "The Correlation Between Metallicity and Debris Disk Mass". The Astrophysical Journal. 826 (2): 171. arXiv: 1604.07403 . Bibcode:2016ApJ...826..171G. doi: 10.3847/0004-637X/826/2/171 . eISSN   1538-4357.
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