Nu 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 ± 0.15mas |
| 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 ± 0.18mas |
| 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 | |
| Database references | |
| SIMBAD | ν Dra |
| ν Dra A | |
| ν Dra B | |
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.
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.
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. Consequently, ν Draconis itself is known as 天棓二 (Tiān Bàng èr, English: the Second Star of Celestial Flail.)
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Wikipedia