Draft:33 Hydrae

This page is about A Hydrae; not to be confused with a Hydrae or α Hydrae.
33 Hydrae
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
Evolutionary stage Red giant
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
BD-05 2840，SAO 136964，HD 82870，HR 3814
Database references
SIMBADdata

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. ^ a b c d e f g h "Pulsating variable Star". SIMBAD. Centre de Données astronomiques de Strasbourg. Archived from the original on 2016-03-19. Retrieved 2012-07-13.
  2. ^ a b c d e f g h "VizieR Detailed Page". Archived from the original on 2016-03-04. Retrieved 2012-07-13.
  3. ^ 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. {{cite book}}: ISBN / Date incompatibility (help)
  4. ^ 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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