18 Aquarii

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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
BD-13° 5923, HD 203705, HIP 105668, HR 8187, FK5 1562, SAO 164364.[6]
Data sources:
Hipparcos Catalogue,
CCDM (2002),
Bright Star Catalogue (5th rev. ed.)

18 Aquarii is the Flamsteed designation for a star in the equatorial constellation of Aquarius. 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[edit]

  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:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357. 
  2. ^ a b c 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. 
  3. ^ a b 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. 
  4. ^ a b c Caillo, A. (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. 
  5. ^ 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. 
  6. ^ "18 Aqr -- Variable Star", SIMBAD Astronomical Database, retrieved 2007-07-15 

External links[edit]