Star in the constellation Vulpecula
9 Vulpeculae Location of 9 Vulpeculae (circled)
Observation dataEpoch J2000 Equinox J2000 Constellation Vulpecula Right ascension 19h 34m 34.89705s [ 1] Declination 19° 46′ 24.2423″[ 1] Apparent magnitude (V)± 0.009[ 2] (4.99 - 5.08)[ 3] Characteristics Spectral type B8 IIIn[ 4] Apparent magnitude (U)± 0.012[ 2] Apparent magnitude (B)± 0.011[ 2] Variable type suspected[ 3] Astrometry Radial velocity (Rv )+5.00[ 5] km/s Proper motion (μ)RA: +13.148[ 1] mas /yr Dec.: +5.142[ 1] mas /yr Parallax (π)5.8317± 0.1242 mas [ 1] Distance 560 ± 10 ly pc ) Absolute magnitude (MV )−1.14[ 6] Details Mass 3.5[ 7] M ☉ Radius 2.8[ 8] R ☉ Luminosity 216[ 8] L ☉ Surface gravity (log g )3,54[ 7] cgs Temperature 12,042[ 7] K Metallicity −0.03[ 7] dex Rotational velocity (v sin i )185[ 9] Age 185[ 10] Myr Other designations 9 Vul ,NSV 12173BD +19°4063GC 27047HD 184606HIP 96275HR 7437SAO 104990WDS J19346+1946A[ 11] Database references SIMBAD data
9 Vulpeculae is astar in the northernconstellation ofVulpecula , located about 560light years away based onparallax . It is visible to the naked eye as a faint, blue-white hued star with a baselineapparent visual magnitude of 5.01. The star is moving further from the Earth with a heliocentricradial velocity of +5 km/s.
This aB-type star with astellar classification of B8 IIIn,[ 4] lines due to rapid rotation. It has a high rate of spin with aprojected rotational velocity of 185 km/s.[ 9] Sun's luminosity from itsphotosphere at aneffective temperature ofK variable star of unknown type, ranging in magnitude from 4.99 down to 5.08.[ 3]
9 Vulpeculae has two reported companions: component B, with a separation of 9.3" and magnitude 13.4, and C, with a separation of 108" and a magnitude of 12.5".[ 12] [ 4] [ 13] [ 14]
^a b c d e 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 c Harmanec, P.; et al. (2020). "A new study of the spectroscopic binary 7 Vul with a Be star primary".Astronomy and Astrophysics .639 . Table A.1.arXiv :2005.11089 Bibcode :2020A&A...639A..32H .doi :10.1051/0004-6361/202037964 .S2CID 218862853 . ^a b c Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)".VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S .1 .Bibcode :2009yCat....102025S . ^a b c Mason, Brian D.; Wycoff, Gary L.; Hartkopf, William I.; Douglass, Geoffrey G.; Worley, Charles E. (2001)."The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog" .The Astronomical Journal .122 (6): 3466.Bibcode :2001AJ....122.3466M .doi :10.1086/323920 Vizier catalog entry ^ Gontcharov, G. A. (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 .S2CID 119231169 . ^ 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 .S2CID 119257644 . Vizier catalog entry ^a b c d Anders, F.; et al. (August 2019)."Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia DR2 stars brighter than G = 18" .Astronomy & Astrophysics .628 : A94.arXiv :1904.11302 Bibcode :2019A&A...628A..94A .doi :10.1051/0004-6361/201935765 ISSN 0004-6361 . ^a b Stassun, Keivan G.; et al. (September 2018)."The TESS Input Catalog and Candidate Target List" .The Astronomical Journal .156 (3): 102.arXiv :1706.00495 Bibcode :2018AJ....156..102S .doi :10.3847/1538-3881/aad050 ISSN 0004-6256 . ^a b Abt, Helmut A.; Levato, Hugo; Grosso, Monica (2002)."Rotational Velocities of B Stars" .The Astrophysical Journal .573 (1):359– 365.Bibcode :2002ApJ...573..359A .doi :10.1086/340590 ^ Gontcharov, G. A. (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 .S2CID 118345778 . Vizier catalog entry ^ "9 Vul" .SIMBAD Centre de données astronomiques de Strasbourg . Retrieved2019-03-14 .^ Dommanget, J.; Nys, O. (2002). "VizieR Online Data Catalog: CCDM (Catalog of Components of Double & Multiple stars) (Dommanget+ 2002)".VizieR On-line Data Catalog: I/274. Originally Published in: Observations et Travaux 54 .1274 .Bibcode :2002yCat.1274....0D . Vizier catalog entry ^ 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 .
