100 Aquarii
Star in the constellation Aquarius
From Wikipedia, the free encyclopedia
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 â8 km/s.[2]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Aquarius |
| Right ascension | 23h 31m 42.03824s[1] |
| Declination | â21° 22â² 10.0640â³[1] |
| Apparent magnitude (V) | 6.24[2] |
| Characteristics | |
| Spectral type | F0 V[3] |
| BâV color index | 0.319±0.008[2] |
| Astrometry | |
| Radial velocity (Rv) | â8.0±7.4[2] km/s |
| Proper motion (μ) | RA: +0.080[1] mas/yr Dec.: +5.503[1] mas/yr |
| Parallax (Ï) | 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] Mâ |
| Radius | 2.51+0.41 â0.15[1] Râ |
| Luminosity | 15.84+1.27 â1.17[4] Lâ |
| Temperature | 7,063±49[4] K |
| Rotational velocity (v sin i) | 123[4] km/s |
| Other designations | |
| 100 Aqr, BDâ22°6141, HD 221357, HIP 116118, HR 8932, SAO 191970[5] | |
| 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]