33 Hydrae
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| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Hydrae[1][2] |
| Right ascension | 9h 34m 32.7s[1][2] |
| Declination | −5° 54′ 54″[1][2] |
| Apparent magnitude (V) | 5.56[1][2] |
| Characteristics | |
| Spectral type | K1III[1][2] |
| U−B color index | 1.13[1][2] |
| B−V color index | 1.16[1][2] |
| R−I color index | 0.41E[1][2] |
| Astrometry | |
| Radial velocity (Rv) | 1.13 km/s |
| Proper motion (μ) | RA: 13 mas/yr Dec.: mas/yr |
| Other designations | |
| Database references | |
| SIMBAD | data |
33 Hydrae (Ukdah III, A Hydrae) is a star in the direction of Hydra. It has a right ascension of 09h 34m 32.64s and a declination of −05° 54′ 53.3″. Its apparent magnitude is 5.56. Considering its distance of 681 light-years from Earth, its absolute magnitude is −1.04. It belongs to the spectral class K1III.
Nomenclature
33 Hydrae is the star's Flamsteed designation. It also has the Bayer designation A Hydrae.
This star along with Tau1 Hydrae, Tau2 Hydrae and Iota Hydrae, were Ptolemy's Καμπή (Kampē); but Kazwini knew them as عقدة ʽuqdah (or ʽuḳdah) "knot".[3] According to a 1971 NASA memorandum,[4] Ukdah was the name of an asterism of four stars: Tau1 Hydrae as Uḳdah I, Tau2 Hydrae as Uḳdah II, 33 Hydrae as Uḳdah III and Iota Hydrae as Uḳdah IV.
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 "Pulsating variable Star". SIMBAD. Centre de Données astronomiques de Strasbourg. Archived from the original on 2016-03-19. Retrieved 2012-07-13.
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 "VizieR Detailed Page". Archived from the original on 2016-03-04. Retrieved 2012-07-13.
- ↑ Allen, R. H. (1963). Star Names: Their Lore and Meaning (Reprint ed.). New York, NY: Dover Publications Inc. p. 250. ISBN 0-486-21079-0. Retrieved 2010-12-12. Search this book on
- ↑ Jack W. Rhoads - Technical Memorandum 33-507-A Reduced Star Catalog Containing 537 Named Stars, Jet Propulsion Laboratory, California Institute of Technology; November 15, 1971
Category:K-type giants Category:Hydra (constellation) Hydrae, A BD-05 2840 Hydrae, 33 083618 047431 3814
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