Upsilon Draconis
| Observation data ICRS )
| ||
|---|---|---|
| Constellation | Draco | |
| Right ascension | 18h 54m 23.85632s[1] | |
| Declination | +71° 17′ 49.8906″[1] | |
| Apparent magnitude (V) | 4.827[2] | |
| Characteristics | ||
| Spectral type | K0 III[3] | |
| U−B color index | +1.10[4] | |
| B−V color index | +1.15[4] | |
| Absolute bolometric magnitude (Mbol) | −0.70[2] | |
Semi-amplitude (K1)(primary) | 6.0 km/s | |
| Details | ||
Gyr | ||
| Database references | ||
| SIMBAD | data | |
Upsilon Draconis (υ Dra) is a
interstellar dust.[9]
In
23 Cassiopeiae.[10]
This is a single-lined
K-type giant star with a stellar classification of K0 III.[3] It is a suspected barium star, which may indicate the orbiting companion, component B, is a white dwarf star.[11]
The measured
mass of the Sun.[6] The star is radiating 170 times the solar luminosity from its photosphere at an effective temperature of 4,561 K.[6]
References
- ^ S2CID 18759600.
- ^ doi:10.1086/513194.
- ^ Bibcode:1962RGOB...51...79E.
- ^ Bibcode:1966CoLPL...4...99J.
- ^ S2CID 119387088.
- ^ S2CID 118505114.
- ^ ISBN 3-540-29692-1. The radius (R*) is given by:
- ^ "ups Dra -- Spectroscopic binary", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg, retrieved 2017-05-30.
- S2CID 17804304.
- ISBN 978-986-7332-25-7.
- .
- .
