15 Draconis

15 Draconis is a single[8] star in the northern circumpolar constellation of Draco, located 452 light years away from the Sun. 15 Draconis is the Flamsteed designation; it also has the Bayer designation i Draconis. This object is visible to the naked eye as a white-hued star with an apparent visual magnitude of 4.94.[2] It is moving closer to the Earth with a heliocentric radial velocity of −7 km/s.[2]

This article is about i Draconis. It is not to be confused with ι (iota) Draconis.
15 Draconis
Observation data
Epoch J2000      Equinox J2000
Constellation Draco
Right ascension  16h 27m 59.01603s[1]
Declination +68° 46′ 05.3051″[1]
Apparent magnitude (V) 4.94[2]
Characteristics
Spectral type A0 III[3]
B−V color index −0.051±0.006[2]
Astrometry
Radial velocity (Rv)−6.7±2.8[2] km/s
Proper motion (μ) RA: −24.818[1] mas/yr
Dec.: +33.623[1] mas/yr
Parallax (π)7.2102 ± 0.1296[1] mas
Distance452 ± 8 ly
(139 ± 2 pc)
Absolute magnitude (MV)−0.93[2]
Details
Radius3.3[4] R☉
Luminosity285.53[2] L☉
Surface gravity (log g)3.4[5] cgs
Temperature9,980[5] K
Rotational velocity (v sin i)154[6] km/s
Other designations
i Draconis, 15 Dra, BD+69° 850, FK5 619, HD 149212, HIP 80650, HR 6161, SAO 17107[7]
Database references
SIMBADdata

This star has a stellar classification of A0 III,[3] matching that of an A-type giant star. It has a relatively high rate of spin with a projected rotational velocity of 154 km/s.[6] The star is radiating 286[2] times the Sun's luminosity from its photosphere at an effective temperature of 9,980 K.[5]

References
  1. 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.
  2. 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.
  3. Cowley, A. (November 1972), "Spectral classification of the bright B8 stars", Astronomical Journal, 77: 750–755, Bibcode:1972AJ.....77..750C, doi:10.1086/111348.
  4. Pasinetti Fracassini, L. E.; et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy and Astrophysics (Third ed.), 367: 521–524, arXiv:astro-ph/0012289, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451.
  5. Baines, E.; et al. (December 2017), "Fundamental Parameters of 87 Stars from the Navy Precision Optical Interferometer", The Astronomical Journal, 155 (1), arXiv:1712.08109, Bibcode:2018AJ....155...30B, doi:10.3847/1538-3881/aa9d8b.
  6. Royer, F.; et al. (October 2002), "Rotational velocities of A-type stars in the northern hemisphere. II. Measurement of v sin i", Astronomy and Astrophysics, 393: 897–911, arXiv:astro-ph/0205255, Bibcode:2002A&A...393..897R, doi:10.1051/0004-6361:20020943
  7. "HD 40409". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-07-16.
  8. Eggleton, P. P.; Tokovinin, A. A. (2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x.
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