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15 Draconis 
Summary
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 A Draconis.[9] 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]
| 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 mas[1] |
| Distance | 452 ± 8 ly (139 ± 2 pc) |
| Absolute magnitude (MV) | −0.93[2] |
| Details | |
| Radius | 3.3[4] R☉ |
| Luminosity | 285.53[2] L☉ |
| Surface gravity (log g) | 3.4[5] cgs |
| Temperature | 9,980[5] K |
| Rotational velocity (v sin i) | 154[6] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
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 edit
- ^ 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.
- ^ a b c d e f g h 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.
- ^ a b Cowley, A. (November 1972), "Spectral classification of the bright B8 stars", Astronomical Journal, 77: 750–755, Bibcode:1972AJ.....77..750C, doi:10.1086/111348.
- ^ Pasinetti Fracassini, L. E.; et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy and Astrophysics, 367 (Third ed.): 521–524, arXiv:astro-ph/0012289, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451, S2CID 425754.
- ^ a b c Baines, E.; et al. (December 2017), "Fundamental Parameters of 87 Stars from the Navy Precision Optical Interferometer", The Astronomical Journal, 155 (1): 30, arXiv:1712.08109, Bibcode:2018AJ....155...30B, doi:10.3847/1538-3881/aa9d8b, S2CID 119427037.
- ^ a b 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, S2CID 14070763
- ^ "HD 40409". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-07-16.
- ^ 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, S2CID 14878976.
- ^ Kostjuk, N. D. (2004). "VizieR Online Data Catalog: HD-DM-GC-HR-HIP-Bayer-Flamsteed Cross Index (Kostjuk, 2002)". VizieR On-line Data Catalog: IV/27A. Originally Published in: Institute of Astronomy of Russian Academy of Sciences (2002). 4027. Bibcode:2004yCat.4027....0K.