1 Aquarii

1 Aquarii
Location of 1 Aqr (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Aquarius
Right ascension 20h 39m 24.891s[1]
Declination +00° 29′ 11.19″[1]
Apparent magnitude (V) 5.151[2]
Characteristics
Spectral type K1III[3]
U−B color index 0.936[2]
B−V color index 1.060[2]
Astrometry
Radial velocity (Rv)−40.93±0.03[4] km/s
Proper motion (μ) RA: 101.95±0.66[1] mas/yr
Dec.: −20.50±0.51[1] mas/yr
Parallax (π)13.99 ± 0.65[1] mas
Distance230 ± 10 ly
(71 ± 3 pc)
Absolute magnitude (MV)0.77[5]
Orbit[4]
Primary1 Aquarii A
Companion1 Aquarii B
Period (P)1966.7±2.9 days
Eccentricity (e)0.368±0.009
Periastron epoch (T)54740±7
Argument of periastron (ω)
(secondary)		150.7±1.6°
Semi-amplitude (K1)
(primary)		3.24±0.04 km/s
Details
Temperature4715±15[6] K
Metallicity−0.12[5]
Rotation1.8[5]
Age~5 Gyr
Other designations
HR 7897, HD 196758, HIP 101936, SAO 126062, BD +0 4064, FK5 3651, WDS J20394+0029, CCDM J20394+0029[7]
Database references
SIMBADdata

1 Aquarii (abbreviated 1 Aqr) is a spectroscopic binary star[4] in the constellation Aquarius. 1 Aquarii is the Flamsteed designation. It is a K-class giant of the spectral type K1III. In addition to the spectroscopic companion there are two optical companions that have no physical relation to 1 Aqr. 1 Aquarii is known to be an infra-red source.

References

  1. 1 2 3 4 5 van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. Vizier catalog entry
  2. 1 2 3 Cousins, A. W. J. (1984). "UBV Photometry of Equatorial Stars". South African Astronomical Observatory Circulars. 8: 69–84. Bibcode:1984SAAOC...8...69C.
  3. ↑ Roman, Nancy G. (1952). "The Spectra of the Bright Stars of Types F5-K5". Astrophysical Journal. 116: 122–143. Bibcode:1952ApJ...116..122R. doi:10.1086/145598.
  4. 1 2 3 Griffin, R. F. (2014). "Spectroscopic binary orbits from photoelectric radial velocities. Paper 239: HD 134169, HD 176526, 1 Aquarii, and HD 219420". The Observatory. 134: 316–339. Bibcode:2014Obs...134..316G.
  5. 1 2 3 Pace, G.; Pasquini, L.; Ortolani, S. (2003). "The Wilson-Bappu effect: A tool to determine stellar distances". Astronomy and Astrophysics. 401 (3): 997. arXiv:astro-ph/0301637. Bibcode:2003A&A...401..997P. doi:10.1051/0004-6361:20030163.
  6. ↑ Luck, R. Earle (2015). "Abundances in the Local Region. I. G and K Giants". Astronomical Journal. 150 (3). 88. arXiv:1507.01466. Bibcode:2015AJ....150...88L. doi:10.1088/0004-6256/150/3/88. Vizier catalog entry
  7. ↑ "1 Aqr". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-03-04.


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