HD 182681
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Sagittarius
Right ascension 19h 26m 56.4828s[1]
Declination −29° 44′ 35.612″[1]
Apparent magnitude (V) +5.64[2]
Characteristics
Spectral type B8.5V[3]
Astrometry
Radial velocity (Rv)1.40[4] km/s
Proper motion (μ) RA: +18.349[1] mas/yr
Dec.: -50.126[1] mas/yr
Parallax (π)14.0013 ± 0.1325 mas[1]
Distance233 ± 2 ly
(71.4 ± 0.7 pc)
Absolute magnitude (MV)+1.44[5]
Details
Mass2.33[6] M☉
Radius2.8[7] R☉
Luminosity31[6] L☉
Surface gravity (log g)4.3[8] cgs
Temperature10,046[6] K
Rotational velocity (v sin i)277[6] km/s
Age107[8] Myr
Other designations
CD−29°16140, HD 182681, HIP 95619, HR 7380, SAO 188127,[9] 186 G. Sagittarii[10]
Database references
SIMBADdata

HD 182681 (186 G. Sagittarii) is a single,[11] blue-hued star in the zodiac constellation of Sagittarius. It has an apparent visual magnitude of +5.64, which is bright enough to be visible to the naked eye in good conditions. Based upon an annual parallax shift of 14.0013 mas as seen from Earth, this star is located around 233 light years from the Sun. It is moving away from the Sun with a radial velocity of 1.40 km/s.[4]

This is a B-type main sequence star with a stellar classification of B8.5V. The star is about 107[8] million years old and is spinning rapidly with a projected rotational velocity of 277 km/s.[6] It has an infrared excess, which suggests a debris disk is orbiting the star at a radius of 47 AU with a mean temperature of 90 K.[12]

References

  1. ^ a b c d e Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  2. ^ Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (2000), "The Tycho-2 catalogue of the 2.5 million brightest stars", Astronomy and Astrophysics, 355: L27, Bibcode:2000A&A...355L..27H.
  3. ^ Hube, Douglas P. (1970), "The radial velocities of 335 late B-type stars", Memoirs of the Royal Astronomical Society, 72: 233, Bibcode:1970MmRAS..72..233H.
  4. ^ a b Kharchenko, N. V.; Scholz, R. -D.; Piskunov, A. E.; Röser, S.; Schilbach, E. (2007), "Astrophysical supplements to the ASCC-2.5: Ia. Radial velocities of ̃55000 stars and mean radial velocities of 516 Galactic open clusters and associations", Astronomische Nachrichten, 328 (9): 889, arXiv:0705.0878, Bibcode:2007AN....328..889K, doi:10.1002/asna.200710776, S2CID 119323941.
  5. ^ 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.
  6. ^ a b c d e Zorec, J.; Royer, F. (January 2012), "Rotational velocities of A-type stars. IV. Evolution of rotational velocities", Astronomy & Astrophysics, 537: A120, arXiv:1201.2052, Bibcode:2012A&A...537A.120Z, doi:10.1051/0004-6361/201117691, S2CID 55586789.
  7. ^ Patel, Rahul I.; Metchev, Stanimir A.; Heinze, Aren (2014), "A Sensitive Identification of Warm Debris Disks in the Solar Neighborhood through Precise Calibration of Saturated WISE Photometry", The Astrophysical Journal Supplement Series, 212 (1): 10, arXiv:1403.3435, Bibcode:2014ApJS..212...10P, doi:10.1088/0067-0049/212/1/10, S2CID 119219094.
  8. ^ a b c Gullikson, Kevin; Kraus, Adam; Dodson-Robinson, Sarah (2016), "The Close Companion Mass-ratio Distribution of Intermediate-mass Stars", The Astronomical Journal, 152 (2): 40, arXiv:1604.06456, Bibcode:2016AJ....152...40G, doi:10.3847/0004-6256/152/2/40, S2CID 119179065.
  9. ^ "HD 182681". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-12-05.
  10. ^ Gould, Benjamin Apthorp (1879), "Uranometria Argentina: Brightness and position of every fixed star, down to the seventh magnitude, within one hundred degrees of the South Pole; with atlas", Resultados del Observatorio Nacional Argentino, 1: I, Bibcode:1879RNAO....1....1G.
  11. ^ Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.
  12. ^ Cotten, Tara H.; Song, Inseok (July 2016), "A Comprehensive Census of Nearby Infrared Excess Stars", The Astrophysical Journal Supplement Series, 225 (1): 24, arXiv:1606.01134, Bibcode:2016ApJS..225...15C, doi:10.3847/0067-0049/225/1/15, S2CID 118438871, 15.
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