1 Aquarii
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) | ±0.03 −40.93[4] km/s |
Proper motion (μ) | RA: ±0.66 101.95[1] mas/yr Dec.: ±0.51 −20.50[1] mas/yr |
Parallax (π) | 13.99 ± 0.65[1] mas |
Distance | 230 ± 10 ly (71 ± 3 pc) |
Absolute magnitude (MV) | 0.77[5] |
Orbit[4] | |
Primary | 1 Aquarii A |
Companion | 1 Aquarii B |
Period (P) | 966.7±2.9 days 1 |
Eccentricity (e) | ±0.009 0.368 |
Periastron epoch (T) | 740±7 54 |
Argument of periastron (ω) (secondary) | ±1.6 150.7° |
Semi-amplitude (K1) (primary) | ±0.04 km/s 3.24 |
Details | |
Temperature | ±15 4715[6] K |
Metallicity | −0.12[5] |
Rotation | 1.8[5] |
Age | ~5 Gyr |
Other designations | |
Database references | |
SIMBAD | data |
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 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
- 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.
- ↑ 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.
- 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.
- 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.
- ↑ 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
- ↑ "1 Aqr". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-03-04.
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