100 Aquarii

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100 Aquarii
Observation data
Epoch J2000      Equinox J2000
Constellation Aquarius
Right ascension  23h 31m 42.03824s[1]
Declination −21° 22′ 10.0640″[1]
Apparent magnitude (V) 6.24[2]
Spectral type F0 V[3]
B−V color index 0.319±0.008[2]
Radial velocity (Rv)−8.0±7.4[2] km/s
Proper motion (μ) RA: +0.080[1] mas/yr
Dec.: +5.503[1] mas/yr
Parallax (π)13.4715 ± 0.0632[1] mas
Distance242 ± 1 ly
(74.2 ± 0.3 pc)
Absolute magnitude (MV)1.83[2]
Mass1.83±0.03[4] M
[1] R
[4] L
Temperature7,063±49[4] K
Rotational velocity (v sin i)123[4] km/s
Other designations
100 Aqr, BD−22° 6141, HD 221357, HIP 116118, HR 8932, SAO 191970[5]
Database references

100 Aquarii is a star in the zodiac constellation of Aquarius. The designation is from the star catalogue of English astronomer John Flamsteed, first published in 1712. It is near the lower limit of visibility to the naked eye, appearing as a dim, yellow-white hued star with an apparent visual magnitude of 6.24.[2] The heliocentric radial velocity is poorly constrained, but the star appears to be moving closer to the Earth at the rate of around −8 km/s.[2]

This is an ordinary F-type main-sequence star with a stellar classification of F0 V.[3] The star has a high rate of spin, showing a projected rotational velocity of 123 km/s.[4] It has 1.8[4] times the mass of the Sun and 2.5[1] times the Sun's radius. The star is radiating 16[4] times the luminosity of the Sun from its photosphere at an effective temperature of 7,063 K.[4]


  1. ^ a b c d e f g Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  2. ^ a b c d e f Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015.
  3. ^ a b Houk, Nancy; Smith-Moore, M. (1978), Michigan catalogue of two-dimensional spectral types for the HD stars, 4, Ann Arbor: Dept. of Astronomy, University of Michigan, Bibcode:1988mcts.book.....H.
  4. ^ a b c d e f g h Zorec, J.; Royer, F. (2012), "Rotational velocities of A-type stars. IV. Evolution of rotational velocities", Astronomy & Astrophysics, 537: A120, arXiv:1201.2052, Bibcode:2012A&A...537A.120Z, doi:10.1051/0004-6361/201117691. Propagation of uncertainty implemented via upper bound/lower bound method.
  5. ^ "100 Aqr". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-02-06.