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]
| 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] |
| Characteristics | |
| Spectral type | F0 V[3] |
| B−V color index | 0.319±0.008[2] |
| Astrometry | |
| 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 mas[1] |
| Distance | 242 ± 1 ly (74.2 ± 0.3 pc) |
| Absolute magnitude (MV) | 1.83[2] |
| Details | |
| Mass | 1.83±0.03[4] M☉ |
| Radius | 2.51+0.41 −0.15[1] R☉ |
| Luminosity | 15.84+1.27 −1.17[4] L☉ |
| Temperature | 7,063±49[4] K |
| Rotational velocity (v sin i) | 123[4] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
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]
References
edit- ^ 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.
- ^ 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, S2CID 119257644.
- ^ a b Houk, Nancy; Smith-Moore, M. (1978), Michigan catalogue of two-dimensional spectral types for the HD stars, vol. 4, Ann Arbor: Dept. of Astronomy, University of Michigan, Bibcode:1988mcts.book.....H.
- ^ 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, S2CID 55586789. Propagation of uncertainty implemented via upper bound/lower bound method.
- ^ "100 Aqr". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-02-06.