HD 195479

Last updated
HD 195479
Delphinus constellation map.svg
Red circle.svg
Location of HD 195479 on the map (circled)
Observation data
Epoch J2000.0        Equinox J2000.0 (ICRS)
Constellation Delphinus
Right ascension 20h 30m 58.26388s [1]
Declination +20° 36′ 23.0762″ [1]
Apparent magnitude  (V)6.20±0.01 [2]
Characteristics
Spectral type kA1 hA9 mF2 [3]
U−B color index +0.13 [4]
B−V color index +0.12 [4]
Astrometry
Radial velocity (Rv)−40.1±1.6 [5]  km/s
Proper motion (μ)RA: +95.633  mas/yr [1]
Dec.: +58.78  mas/yr [1]
Parallax (π)11.3074 ± 0.0337  mas [1]
Distance 288.4 ± 0.9  ly
(88.4 ± 0.3  pc)
Absolute magnitude  (MV)+1.53 [6]
Details
Mass 2.05+0.38
−0.24 [7]   M☉
Radius 2.15±0.11 [8]   R☉
Luminosity 38.96+0.36
−0.42 [1]   L☉
Surface gravity (log g)4.08 [9]   cgs
Temperature 8,454 [10]   K
Metallicity [Fe/H]−0.11 [11]   dex
Rotational velocity (v sin i)18.0±0.6 [9]  km/s
Age 631 [12]   Myr
Other designations
AG+20°2271, BD+20°4602, GC  28540, HD  195479, HIP  101213, HR  7839, SAO  88783, CCDM J20310+2036A, WDS J20310+2036A, TIC  379435621 [13]
Database references
SIMBAD data

HD 195479, also designated as HR 7839, is a solitary star located in the northern constellation Delphinus, the dolphin. It has an apparent magnitude of 6.20, [2] placing it near the limit for naked eye visibility, even under ideal conditions. The object is located relatively close at a distance of 288 light-years based on Gaia DR3 parallax measurements [1] and it is drifting closer with a heliocentric radial velocity of −40.1  km/s . [5] At its current distance, HD 195479's brightness is diminished by an interstellar extinction of 0.27 magnitudes [14] and it has an absolute magnitude of +1.53. [6]

HD 195479 is an Am star with a stellar classification of kA1hA9mF2. [3] The notion indicates that it has the calcium K-lines of an A1 star, the hydrogen lines of an A9 star, and the metallic lines of a F2 star. It has 2.05 times the mass of the Sun [7] and 2.15 times the radius of the Sun. [8] It radiates 38.96 times the luminosity of the Sun [1] from its photosphere at an effective temperature of 8,454  K , [10] giving it white hue when viewed in the night sky. HD 195479 is deficient in iron, having an abundance 77.6% of the Sun's. [11] It is estimated to be 631 million years old [12] and it spins modestly with a projected rotational velocity of 18.0  km/s , [9] common for Am stars.

The star has two optical companions: a 12th magnitude star designated B located 5.7" away along a position angle of 88° and a 13th magnitude star designated C located 55.9" away along a position angle of 206°. [15] They were both observed by American astronomer Sherburne Wesley Burnham during the late 19th century. [16] B and C are both background stars that are far more distant than HD 195479. [17] [18]

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<span class="mw-page-title-main">HD 168592</span> Star in the constellation of Corona Australis

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<span class="mw-page-title-main">HD 31134</span> Star in the constellation of Camelopardalis

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<span class="mw-page-title-main">HD 36584</span> Visual binary in Dorado.

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References

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  13. ↑ "HD 195479". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved March 13, 2024.
  14. ↑ Gontcharov, George A.; Mosenkov, Aleksandr V. (28 September 2017). "Verifying reddening and extinction for Gaia DR1 TGAS main sequence stars". Monthly Notices of the Royal Astronomical Society. 472 (4): 3805–3820. arXiv: 1709.01160 . Bibcode:2017MNRAS.472.3805G. doi: 10.1093/mnras/stx2219 . eISSN   1365-2966. ISSN   0035-8711. S2CID   118879856.
  15. ↑ Mason, Brian D.; Wycoff, Gary L.; Hartkopf, William I.; Douglass, Geoffrey G.; Worley, Charles E. (December 2001). "The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog". The Astronomical Journal. 122 (6): 3466–3471. Bibcode:2001AJ....122.3466M. doi: 10.1086/323920 . ISSN   0004-6256. S2CID   119533755.
  16. ↑ Burnham, S. W. (November 1875). "Sixth Catalogue of 90 new double stars discovered with a 6‐inch refractor". Astronomische Nachrichten. Wiley. 86 (22): 337–350. Bibcode:1875AN.....86..337B. doi:10.1002/asna.18750862202. ISSN   0004-6337. S2CID   121918815.
  17. ↑ 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.
  18. ↑ 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.
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