103 Aquarii
Star in the constellation Aquarius
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103 Aquarii is a single[7] star in the equatorial constellation of Aquarius. 103 Aquarii is the Flamsteed designation, although it also bears the Bayer designation A1 Aquarii.[8] It is faint but visible to the naked eye as an orange hued star with an apparent visual magnitude of 5.34.[2] Based upon an annual parallax shift of 4.69 mas, the distance to this star is around 700 light-years (210 parsecs).[1] It is moving away from the Earth with a heliocentric radial velocity of +25 km/s.[4]
| Observation data Epoch J2000.0 (ICRS) Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Aquarius |
| Right ascension | 23h 41m 34.48893s[1] |
| Declination | â18° 01â² 37.4656â³[1] |
| Apparent magnitude (V) | 5.34[2] |
| Characteristics | |
| Spectral type | K4/K5 III[3] |
| BâV color index | +1.57[2] |
| Astrometry | |
| Radial velocity (Rv) | +25.1[4] km/s |
| Proper motion (μ) | RA: â41.665[1] mas/yr Dec.: â71.428[1] mas/yr |
| Parallax (Ï) | 4.6918±0.2010 mas[1] |
| Distance | 700 ± 30 ly (213 ± 9 pc) |
| Details | |
| Radius | 63.6+0.5 â1.0[1] Râ |
| Luminosity | 848±42[1] Lâ |
| Surface gravity (log g) | 1.59[5] cgs |
| Temperature | 3,910[5] K |
| Metallicity [Fe/H] | â0.18[5] dex |
| Other designations | |
| 103 Aqr, BDâ18°6357, HD 222547, HIP 116889, HR 8980, SAO 165834[6] | |
| Database references | |
| SIMBAD | data |
This is classified as a K-type giant star,[3] having evolved off the main sequence after exhausting the hydrogen at its core and expanded to 64 times the Sun's radius. The star is radiating 848 times the luminosity of the Sun[1] from its enlarged photosphere at an effective temperature of 3,910 K.[5]