Nu Draconis

ν¹/ν² Draconis
Observation data; Epoch J2000 Equinox J2000
Constellation	Draco
	ν1 Dra
Right ascension	17h 32m 10.56856s
Declination	+55° 11′ 03.2739″
Apparent magnitude (V)	+4.88
	ν2 Dra
Right ascension	17h 32m 16.02464s
Declination	+55° 10′ 22.6504″
Apparent magnitude (V)	+4.88
Characteristics
Spectral type	A6 V + A4m
U−B color index	+0.03/+0.04
B−V color index	+0.26/+0.27
Astrometry
ν1 Dra
Radial velocity (Rv)	–15.2 km/s
Proper motion (μ)	RA: +147.39 mas/yr ; Dec.: +54.31 mas/yr
Parallax (π)	33.06 ± 0.15 mas
Distance	98.7 ± 0.4 ly ; (30.2 ± 0.1 pc)
ν2 Dra
Radial velocity (Rv)	–16.0 km/s
Proper motion (μ)	RA: +142.65 mas/yr ; Dec.: +62.43 mas/yr
Parallax (π)	32.80 ± 0.18 mas
Distance	99.4 ± 0.5 ly ; (30.5 ± 0.2 pc)
Details
ν1 Dra
Rotational velocity (v sin i)	86 km/s
ν2 Dra
Rotational velocity (v sin i)	68 km/s
Other designations
	ν Draconis, ν Dra, Kuma; ν1 Dra: 24 Dra, BD+55 1944, FK5 655, HD 159541, HIP 85819, HR 6554, SAO 30447.; ν2 Dra: 25 Dra, BD+55 1945, FK5 657, HD 159560, HIP 85829, HR 6555, SAO 30450.

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, Template:Lang-en.)^[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, arXiv:0708.1752, 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, retrieved 2010-06-04
^ ^a ^b ^c "25 Dra -- Spectroscopic binary", SIMBAD Astronomical Object Database, Centre de Données astronomiques de Strasbourg, retrieved 2010-06-04
^ ^a ^b Wilson, Ralph Elmer (1953), General Catalogue of Stellar Radial Velocities, Washington: Carnegie Institution of Washington, Bibcode:1953GCRV..C......0W
^ ^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, retrieved 2010-12-12
^ Template:Zh icon 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.
^ Template:Zh icon 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

This binary or multiple star system–related article is a stub. You can help Wikipedia by expanding it.

[aaa474_2_653-1] ^ ^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, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357

[clpl4_99-2] 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

[simbad_1-3] "24 Dra -- Star in double system", SIMBAD Astronomical Object Database, Centre de Données astronomiques de Strasbourg, retrieved 2010-06-04

[simbad_2-4] "25 Dra -- Spectroscopic binary", SIMBAD Astronomical Object Database, Centre de Données astronomiques de Strasbourg, retrieved 2010-06-04

[gcsrv-5] Wilson, Ralph Elmer (1953), General Catalogue of Stellar Radial Velocities, Washington: Carnegie Institution of Washington, Bibcode:1953GCRV..C......0W

[aaa393-6] 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

[allen1963-7] 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, retrieved 2010-12-12

[8] Template:Zh icon 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.

[9] Template:Zh icon 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.

[1]

[2]

[3]

[4]

[5]

[6]

[7]

[8]

[9]

Observation data Epoch J2000 Equinox J2000
Constellation	Draco
ν¹ Dra
Right ascension	17^h 32^m 10.56856^s^[1]
Declination	+55° 11′ 03.2739″^[1]
Apparent magnitude (V)	+4.88^[2]
ν² Dra
Right ascension	17^h 32^m 16.02464^s^[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 (R_v)	–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 mas^[1]
Distance	98.7 ± 0.4 ly (30.2 ± 0.1 pc)
ν² Dra
Radial velocity (R_v)	–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 mas^[1]
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
ν Draconis, ν Dra, Kuma ν¹ Dra: 24 Dra, BD+55 1944, FK5 655, HD 159541, HIP 85819, HR 6554, SAO 30447.^[3] ν² Dra: 25 Dra, BD+55 1945, FK5 657, HD 159560, HIP 85829, HR 6555, SAO 30450.^[4]