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
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 2.0 2.1 2.2 2.3 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 3.0 3.1 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 4.0 4.1 4.2 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 5.0 5.1 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 6.0 6.1 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ (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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