66 Aquarii
Star in the constellation Aquarius
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66 Aquarii is a single[11] star in the equatorial constellation of Aquarius. 66 Aquarii is the Flamsteed designation though the star also bears the Bayer designation of g1 Aquarii.[12] It is visible to the naked eye as a faint, orange-hued star with an apparent visual magnitude of 4.673.[2] Based upon an annual parallax shift of 7.53 milliarcseconds,[1] the distance to this star is about 430 light-years (130 parsecs).
 | |
| Observation data Epoch J2000 Equinox ICRS | |
|---|---|
| Constellation | Aquarius |
| Right ascension | 22h 43m 35.23307s[1] |
| Declination | −18° 49′ 49.3557″[1] |
| Apparent magnitude (V) | 4.673[2] |
| Characteristics | |
| Spectral type | K3 III[3] |
| U−B color index | +1.549[2] |
| B−V color index | +1.376[2] |
| Variable type | suspected[4] |
| Astrometry | |
| Radial velocity (Rv) | +21.6[5] km/s |
| Proper motion (μ) | RA: −31.73[1] mas/yr Dec.: −28.54[1] mas/yr |
| Parallax (π) | 7.53±0.26 mas[1] |
| Distance | 430 ± 10 ly (133 ± 5 pc) |
| Absolute magnitude (MV) | −0.93[6] |
| Details | |
| Radius | 37[7] R☉ |
| Luminosity | 434.08[6] L☉ |
| Surface gravity (log g) | 2.06[8] cgs |
| Temperature | 4,170[8] K |
| Metallicity [Fe/H] | −0.23[8] dex |
| Rotational velocity (v sin i) | 10[9] km/s |
| Other designations | |
| 66 Aqr, BD−19°6324, HD 215167, HIP 112211, HR 8649, SAO 165252[10] | |
| Database references | |
| SIMBAD | data |
This is an evolved giant star with a stellar classification of K3 III.[3] It has expanded to 37 times the radius of the Sun[7] and is radiating 434[6] times the luminosity of the Sun from its outer envelope at an effective temperature of 4,170 K.[8] This gives it the orange-hued glow of a K-type star.[13] It is a suspected variable star that ranges in magnitude between 4.66 and 4.71.[4]