Am star in the constellation Delphinus.
HD 195479Location of HD 195479 on the map (circled)
Observation dataEpoch 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−Bcolor index +0.13[ 4] B−Vcolor index +0.12[ 4] Astrometry Radial velocity (Rv )−40.1± 1.6[ 5] km/s Proper motion (μ)RA: +95.633mas /yr [ 1] Dec.: +58.78mas /yr [ 1] Parallax (π)11.3074± 0.0337 mas [ 1] Distance 288.4 ± 0.9 ly 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 −0.11[ 11] dex Rotational velocity (v sin i )18.0± 0.6[ 9] Age 631[ 12] Myr Other designations AG +20°2271BD +20°4602GC 28540HD 195479HIP 101213HR 7839SAO 88783CCDM J20310+2036AWDS J20310+2036ATIC 379435621[ 13] Database references SIMBAD data
HD 195479 , also designated asHR 7839 , is a solitarystar located in the northernconstellation Delphinus , the dolphin. It has anapparent magnitude of 6.20,[ 2] naked eye visibility, even underideal conditions . The object is located relatively close at a distance of 288light-years based onGaia DR3 parallax measurements[ 1] radial velocity ofkm/s [ 5] interstellar extinction of 0.27magnitudes [ 14] absolute magnitude of +1.53.[ 6]
HD 195479 is anAm star with astellar classification of kA1hA9mF2.[ 3] calcium K-lines of an A1 star, thehydrogen lines of an A9 star, and themetallic lines of a F2 star. It has 2.05 times themass of the Sun [ 7] radius of the Sun .[ 8] luminosity of the Sun [ 1] photosphere at aneffective temperature ofK [ 10] night sky . HD 195479 is deficient iniron , having an abundance 77.6% of theSun 's.[ 11] million years old[ 12] projected rotational velocity ofkm/s [ 9]
The star has two optical companions: a 12th magnitude star designated B located 5.7" away along aposition angle of 88° and a 13th magnitude star designated C located 55.9" away along a position angle of 206°.[ 15] astronomer Sherburne Wesley Burnham during the late 19th century.[ 16] [ 17] [ 18]
^a b c d e f g 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 atVizieR .^a b Fabricius, C.; Høg, E.; Makarov, V. V.; Mason, B. D.; Wycoff, G. L.; Urban, S. E. (March 2002)."The Tycho double star catalogue" .Astronomy & Astrophysics .384 (1):180– 189.Bibcode :2002A&A...384..180F .doi :10.1051/0004-6361:20011822 eISSN 1432-0746 .ISSN 0004-6361 . ^a b Abt, Helmut A.; Morrell, Nidia I. (July 1995)."The Relation between Rotational Velocities and Spectral Peculiarities among A-Type Stars" .The Astrophysical Journal Supplement Series .99 : 135.Bibcode :1995ApJS...99..135A .doi :10.1086/192182 ISSN 0067-0049 .S2CID 120495962 . ^a b Mendoza, E. E.; Gomez, V. T.; Gonzalez, S. (June 1978)."UBVRI photometry of 225 AM stars" .The Astronomical Journal .83 : 606.Bibcode :1978AJ.....83..606M .doi :10.1086/112242 S2CID 121449759 . ^a b 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 . ^a b 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 . ^a b Stassun, Keivan G.; et al. (9 September 2019)."The RevisedTESS 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 eISSN 1538-3881 .hdl :1721.1/124721 S2CID 166227927 . ^a b Kervella, P.; Thévenin, F.; Di Folco, E.; Ségransan, D. (April 8, 2004)."The angular sizes of dwarf stars and subgiants: Surface brightness relations calibrated by interferometry" .Astronomy & Astrophysics .426 (1):297– 307.arXiv :astro-ph/0404180 Bibcode :2004A&A...426..297K .doi :10.1051/0004-6361:20035930 eISSN 1432-0746 .ISSN 0004-6361 .S2CID 6077801 . ^a b c Shorlin, S. L. S.; Wade, G. A.; Donati, J.-F.; Landstreet, J. D.; Petit, P.; Sigut, T. A. A.; Strasser, S. (2002)."A highly sensitive search for magnetic fields in B, A and F stars" .Astronomy & Astrophysics .392 (2):637– 652.Bibcode :2002A&A...392..637S .doi :10.1051/0004-6361:20021192 ISSN 0004-6361 .S2CID 1706867 . ^a b McDonald, I.; Zijlstra, A. A.; Watson, R. A. (15 June 2017)."Fundamental parameters and infrared excesses of Tycho–Gaia stars" .Monthly Notices of the Royal Astronomical Society .471 (1):770– 791.arXiv :1706.02208 Bibcode :2017MNRAS.471..770M .doi :10.1093/mnras/stx1433 eISSN 1365-2966 .ISSN 0035-8711 .S2CID 73594365 . ^a b Anders, F.; et al. (February 2022)."Photo-astrometric distances, extinctions, and astrophysical parameters forGaia EDR3 stars brighter thanG = 18.5" .Astronomy & Astrophysics .658 : A91.arXiv :2111.01860 Bibcode :2022A&A...658A..91A .doi :10.1051/0004-6361/202142369 eISSN 1432-0746 .ISSN 0004-6361 . ^a b Gontcharov, G. A. (December 2012). "Dependence of kinematics on the age of stars in the solar neighborhood".Astronomy Letters .38 (12):771– 782.arXiv :1606.08814 Bibcode :2012AstL...38..771G .doi :10.1134/S1063773712120031 .eISSN 1562-6873 .ISSN 1063-7737 .S2CID 118345778 . ^ "HD 195479" .SIMBAD Centre de données astronomiques de Strasbourg . RetrievedMarch 13, 2024 .^ 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 . ^ 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 . ^ Burnham, S. W. (November 1875). "Sixth Catalogue of 90 new double stars discovered with a 6-inch refractor".Astronomische Nachrichten .86 (22). Wiley:337– 350.Bibcode :1875AN.....86..337B .doi :10.1002/asna.18750862202 .ISSN 0004-6337 .S2CID 121918815 . ^ 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 atVizieR .^ 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 atVizieR .
