29 Aquarii

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29 Aquarii
Observation data
Epoch J2000      Equinox J2000
Constellation Aquarius
Right ascension 22h 02m 26.24906s[1]
Declination −16° 57′ 53.4077″[1]
Apparent magnitude (V) 6.37
Spectral type A2 V + K0 III[2]
B−V color index 0.42
Radial velocity (Rv) 15 km/s
Proper motion (μ) RA: +6.26[1] mas/yr
Dec.: –0.51[1] mas/yr
Parallax (π) 3.70 ± 1.99[1] mas
Distance approx. 900 ly
(approx. 300 pc)
Other designations
BD−17° 6422, HD 209278, HIP 108797, HR 8396, SAO 164830.[3]
Database references

29 Aquarii (abbreviated 29 Aqr) is a binary star system in the equatorial constellation of Aquarius. 29 Aquarii is the Flamsteed designation; the system also bears the variable star designation DX Aquarii. The orbital plane of the two stars lies near the line of sight, so they form an Algol-type eclipsing binary. The first component of the system is an A-type main sequence star with a stellar classification of A2 V. Its companion is giant star with a classification of K0 III. Their orbital period is 0.94501 days.[2]

Stellar system[edit]

The variability of this star was first noticed in 1965 by W. Strohmeier of Remeis-Observatory in Bamberg, Germany.[4] He later discovered that the variability was caused by a binary companion eclipsing the primary star.[5]


  1. ^ a b c d e van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752Freely accessible, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357. 
  2. ^ a b Zasche, P.; et al. (August 2009), "A Catalog of Visual Double and Multiple Stars With Eclipsing Components", The Astronomical Journal, 138 (2): 664–679, arXiv:0907.5172Freely accessible, Bibcode:2009AJ....138..664Z, doi:10.1088/0004-6256/138/2/664. 
  3. ^ "BD-17 6422 -- Spectroscopic binary", SIMBAD Astronomical Object Database, Centre de Données astronomiques de Strasbourg, retrieved 2012-07-16. 
  4. ^ Strohmeier, W.; et al. (1965). "Bright Southern BV-Stars". Information Bulletin On Variable Stars. 81. Bibcode:1965IBVS...81....1S. 
  5. ^ Strohmeier, W. (1966). "BV 449 and BV 600, Two Bright EB-Stars". Information Bulletin On Variable Stars. 164. Bibcode:1966IBVS..164....1S. 

External links[edit]