18 Aquarii
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Aquarius |
| Right ascension | 21h 24m 11.49206s[1] |
| Declination | −12° 52′ 41.1928″[1] |
| Apparent magnitude (V) | 5.49[2] |
| Characteristics | |
| Spectral type | F0 V[3] |
| B−V color index | +0.29[2] |
| Astrometry | |
| Proper motion (μ) | RA: +89.60[1] mas/yr Dec.: +8.62[1] mas/yr |
| Parallax (π) | 21.23 ± 0.29 mas |
| Distance | 154 ± 2 ly (47.1 ± 0.6 pc) |
| Details | |
| Surface gravity (log g) | 3.98[4] cgs |
| Temperature | 7,194[4] K |
| Metallicity [Fe/H] | –0.16[4] dex |
| Rotational velocity (v sin i) | 138[5] km/s |
| Other designations | |
| Data sources: | |
| Hipparcos Catalogue, CCDM (2002), Bright Star Catalogue (5th rev. ed.) | |
18 Aquarii (abbreviated 18 Aqr) is a star in the equatorial constellation of Aquarius. 18 Aquarii is the Flamsteed designation. Its apparent magnitude is 5.49[2] and it is 154 light-years (47 parsecs) from Earth.[1] This is an F-type main sequence star with a stellar classification of F0 V.[3]
References
- 1 2 3 4 5 van Leeuwen, F. (November 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. - 1 2 3 Johnson, H. L.; et al. (1966), "UBVRIJKL photometry of the bright stars", Communications of the Lunar and Planetary Laboratory, 4 (99), Bibcode:1966CoLPL...4...99J.
- 1 2 Houk, Nancy (1978), Michigan catalogue of two-dimensional spectral types for the HD stars, 4, Ann Arbor: Dept. of Astronomy, University of Michigan, Bibcode:1988MSS...C04....0H.
- 1 2 3 Soubiran, C.; et al. (June 2010), "The PASTEL catalogue of stellar parameters", Astronomy and Astrophysics, 515: A111, arXiv:1004.1069, Bibcode:2010A&A...515A.111S, doi:10.1051/0004-6361/201014247.
- ↑ Royer, F.; Zorec, J.; Gómez, A. E. (February 2007), "Rotational velocities of A-type stars. III. Velocity distributions", Astronomy and Astrophysics, 463 (2): 671–682, arXiv:astro-ph/0610785, Bibcode:2007A&A...463..671R, doi:10.1051/0004-6361:20065224.
- ↑ "18 Aqr -- Variable Star", SIMBAD Astronomical Database, retrieved 2007-07-15
External links
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