Nu Draconis
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Nu Draconis
| Observation data Epoch J2000 Equinox J2000 |
|
|---|---|
| Constellation | Draco |
| ν1 Dra | |
| Right ascension | 17h 32m 10.56856s[1] |
| Declination | +55° 11′ 03.2739″[1] |
| Apparent magnitude (V) | +4.88[2] |
| ν2 Dra | |
| Right ascension | 17h 32m 16.02464s[1] |
| Declination | +55° 10′ 22.6504″[1] |
| Apparent magnitude (V) | +4.88[2] |
| Characteristics | |
| Spectral type | A6 V[3] + A4m[4] |
| U−B color index | +0.03/+0.04[2] |
| B−V color index | +0.26/+0.27[2] |
| Astrometry | |
| ν1 Dra | |
| Radial velocity (Rv) | –15.2[5] km/s |
| Proper motion (μ) | RA: +147.39[1] mas/yr Dec.: +54.31[1] mas/yr |
| Parallax (π) | 33.06 ± 0.15[1] mas |
| Distance | 98.7 ± 0.4 ly (30.2 ± 0.1 pc) |
| ν2 Dra | |
| Radial velocity (Rv) | –16.0[5] km/s |
| Proper motion (μ) | RA: +142.65[1] mas/yr Dec.: +62.43[1] mas/yr |
| Parallax (π) | 32.80 ± 0.18[1] mas |
| Distance | 99.4 ± 0.5 ly (30.5 ± 0.2 pc) |
| Details | |
| ν1 Dra | |
| Rotational velocity (v sin i) | 86[6] km/s |
| ν2 Dra | |
| Rotational velocity (v sin i) | 68[6] km/s |
| Other designations | |
Nu Draconis (also known as ν Dra, ν Draconis, or Kuma) is a double star in the constellation Draco. The respective components are designated ν1 Draconis and ν2 Draconis. The second component is a spectroscopic binary star system.[4]
This star, along with β Dra (Rastaban), γ Dra (Eltanin), μ Dra (Erakis) and ξ Dra (Grumium) were Al ʽAwāïd, "the Mother Camels", which was later known as the Quinque Dromedarii.[7]
In Chinese, 天棓 (Tiān Bàng), meaning Celestial Flail, refers to an asterism consisting of ν Draconis, ξ Draconis, β Draconis, γ Draconis and ι Herculis.[8] Consequently, ν Draconis itself is known as 天棓二 (Tiān Bàng èr, English: the Second Star of Celestial Flail.)[9]
References
- ^ a b c d e f g h i j van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics 474 (2): 653–664, Bibcode 2007A&A...474..653V, doi:10.1051/0004-6361:20078357
- ^ a b c d Johnson, H. L. et al. (1966), "UBVRIJKL photometry of the bright stars", Communications of the Lunar and Planetary Laboratory 4 (99), Bibcode 1966CoLPL...4...99J
- ^ a b "24 Dra -- Star in double system", SIMBAD Astronomical Object Database (Centre de Données astronomiques de Strasbourg), http://simbad.u-strasbg.fr/simbad/sim-id?Ident=24+Dra, retrieved 2010-06-04
- ^ a b c "25 Dra -- Spectroscopic binary", SIMBAD Astronomical Object Database (Centre de Données astronomiques de Strasbourg), http://simbad.u-strasbg.fr/simbad/sim-id?Ident=25+Dra, retrieved 2010-06-04
- ^ a b Wilson, Ralph Elmer (1953), General Catalogue of Stellar Radial Velocities, Washington: Carnegie Institution of Washington, Bibcode 1953QB901.W495.....
- ^ 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
- ^ Allen, R. H. (1963), Star Names: Their Lore and Meaning (Reprint ed.), New York, NY: Dover Publications Inc, p. 207, ISBN 0-486-21079-0, http://penelope.uchicago.edu/Thayer/E/Gazetteer/Topics/astronomy/_Texts/secondary/ALLSTA/Draco*.html, retrieved 2010-12-12
- ^ (Chinese) 中國星座神話, written by 陳久金. Published by 台灣書房出版有限公司, 2005, ISBN 978-986-7332-25-7.
- ^ (Chinese) 香港太空館 - 研究資源 - 亮星中英對照表, Hong Kong Space Museum. Accessed on line November 23, 2010.
External links
- Kaler, James. Kuma
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