HD 194012

Last updated
HD 194012
Observation data
Epoch J2000.0        Equinox J2000.0 (ICRS)
Constellation Delphinus
Right ascension 20h 22m 52.3692s [1]
Declination +14° 33′ 03.9513″ [1]
Apparent magnitude  (V)6.15±0.01 [2]
Characteristics
Spectral type F7 V [3]
U−B color index −0.07 [4]
B−V color index +0.51 [4]
Astrometry
Radial velocity (Rv)4.5±0.2 [5]  km/s
Proper motion (μ)RA: +78.997  mas/yr [1]
Dec.: −7.143  mas/yr [1]
Parallax (π)38.4009 ± 0.0233  mas [1]
Distance 84.93 ± 0.05  ly
(26.04 ± 0.02  pc)
Absolute magnitude  (MV)+4.06 [6]
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, [2] making it visible to the naked eye under ideal conditions. The star is relatively close at a distance of only 85 light years [1] but is receding with a heliocentric radial velocity of 4.5  km/s . [5]

HD 194012 has a stellar classification of F7 V, [3] 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]

Related Research Articles

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<span class="mw-page-title-main">HD 27022</span> Star in the constellation Camelopardalis

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<span class="mw-page-title-main">42 Leonis Minoris</span> Star in the constellation Leo Minor

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<span class="mw-page-title-main">YY Mensae</span> Star in the constellation of Mensa

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HR 8526, also known as HD 212168, is the primary of a triple star located in the southern circumpolar constellation Octans. The star and its companion have apparent magnitudes of 6.12 and 9.36 respectively. The system is located relatively close at a distance of 76 light years based on Gaia DR3 parallax measurements, but is receding with a heliocentric radial velocity of 15 km/s.

<span class="mw-page-title-main">HD 201772</span> Star in the constellation Microscopium

HD 201772, also known as HR 8104, is a yellowish-white hued star located in the southern constellation Microscopium. It has an apparent magnitude of 5.26, making it one of the brighter members of this generally faint constellation. The object is located relatively close at a distance of 111 light-years based on Gaia DR3 parallax measurements but is approaching closer with a heliocentric radial velocity of −41 km/s. At its current distance, HD 201772's brightness is diminished by 0.11 magnitudes due to interstellar dust.

<span class="mw-page-title-main">HD 204018</span> Visual binary in Microscopium

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<span class="mw-page-title-main">HD 29678</span> A-type dwarf; Camelopardalis

HD 29678, also known as HR 1491, is a solitary star located in the northern circumpolar constellation Camelopardalis. It is faintly visible to the naked eye as a yellowish-white hued point of light with an apparent magnitude of 5.95. The object is located relatively close at a distance of 155 light-years and it is drifting closer with a somewhat constrained heliocentric radial velocity of approximately −6.0 km/s. At is current distance, HD 29678's brightness is diminished by 0.13 magnitudes due to interstellar extinction and it has an absolute magnitude of +2.60. Its observed kinematics suggest that it is a member of the Pleiades supercluster.

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 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.
  4. 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.
  5. 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.
  6. ↑ 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. ISSN   1063-7737. S2CID   119257644.
  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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