Nu Draconis

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𝜈 Draconis

𝜈 Draconis in optical light
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
𝜈1 Dra
Spectral type A8Vm[3] (kA3hF0mF0[4])
U−B color index +0.03[2]
B−V color index +0.26[2]
𝜈2 Dra
Spectral type A4IVm[3] (kA3hF1mF0[4])
U−B color index +0.04[2]
B−V color index +0.27[2]
Distance
99.4 ± 0.5 ly
(30.5 ± 0.2 pc)
Semi-amplitude
(K1)
(primary)		10.0 km/s
Details
𝜈1 Dra
Rotational velocity (v sin i)
68[9] km/s
HR 6555, SAO 30450[14]
Database references
SIMBAD𝜈 Dra
𝜈1 Dra
𝜈2 Dra

Nu Draconis (also known as 𝜈 Dra, 𝜈 Draconis, where 𝜈 is the Greek letter

spectroscopic binary star system.[14]

This star, along with β Dra (Rastaban), γ Dra (Eltanin), μ Dra (Alrakis) and ξ Dra (Grumium) were Al ʽAwāïd, "the Mother Camels", which was later known as the Quinque Dromedarii.[15]

In

Chinese name for 𝜈 Draconis itself is 天棓二 (Tiān Bàng èr, English: the Second Star of Celestial Flail.)[17]

The two stars of the visual binary are considered to be a common proper motion pair on the basis of their very similar

radial velocities, and proper motions, although no orbital motion can be observed.[18]

𝜈1 Draconis is an

calcium K lines, F0 if determined from its hydrogen lines, and F0 if determined from other metallic spectral lines.[4]

𝜈2 Draconis is a spectroscopic binary with a period of 38 days. The two stars are separated by 0.267 au on average, and they have an almost circular orbit with an eccentricity of 0.03.[19][6] The primary is also an Am star, while the secondary has a low mass and luminosity and is only inferred from the orbital movement of the more massive star.[7]

References

  1. ^
    S2CID 18759600
  2. ^
    Bibcode:1966CoLPL...4...99J PDF
  3. ^
    doi:10.3847/1538-3881/aa679a
    .
  4. ^
    doi:10.1086/192182
    .
  5. ^
    Bibcode:1953GCRV..C......0W
    .
  6. ^
    Bibcode:1992A&AS...93..545M
    .
  7. ^ a b c A.Tokovinin. "Multiple Star Catalog". Archived from the original on 2020-10-03. Retrieved 2018-04-24.
  8. ^
    S2CID 119258214
    .
  9. ^
    S2CID 14070763
  10. S2CID 118629873. Vizier catalog entry
  11. S2CID 15278668
    .
  12. Bibcode:2008CoSka..38..455S
    .
  13. ^ "24 Dra". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2010-06-04.
  14. ^ a b "25 Dra". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2010-06-04.
  15. ISBN 978-0-486-21079-7
    , retrieved 2010-12-12
  16. ISBN 978-986-7332-25-7
    .
  17. ^ (in Chinese) 香港太空館 - 研究資源 - 亮星中英對照表 Archived 2011-01-29 at the Wayback Machine, Hong Kong Space Museum. Accessed on line November 23, 2010.
  18. S2CID 16800796
    .
  19. S2CID 119237891
    .

External links


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