| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Aquarius |
| Right ascension | 22h35m 48.80173s[1] |
| Declination | −17° 27′ 37.5415″[1] |
| Apparent magnitude (V) | 6.39[2] |
| Characteristics | |
| Spectral type | K4 III[3] |
| B−V color index | 1.420±0.015[2] |
| Astrometry | |
| Radial velocity (Rv) | −8.1±2.9[4] km/s |
| Proper motion (μ) | RA: −29.242[1] mas/yr Dec.: −41.566[1] mas/yr |
| Parallax (π) | 6.5274 ± 0.0513 mas[1] |
| Distance | 500 ± 4 ly (153 ± 1 pc) |
| Absolute magnitude (MV) | 0.53[2] |
| Details[5] | |
| Mass | 0.572±0.031 M☉ |
| Radius | 11.754+0.611 −1.450 R☉ |
| Luminosity | 126.56[2] L☉ |
| Surface gravity (log g) | 2.401+0.180 −0.045 cgs |
| Temperature | 4430+141 −53 K |
| Metallicity [Fe/H] | 0.099+0.120 −0.100 dex |
| Other designations | |
| Database references | |
| SIMBAD | data |
61 Aquarii, abbreviated 61 Aqr, is an orange-hued star in the zodiac constellationofAquarius. 61 Aquarii is its Flamsteed designation. It has an apparent visual magnitude of 6.39,[2] which indicates it is a dim star that requires good seeing conditions to view. Based upon an annual parallax shiftof6.53 mas[1] as seen from Earth's orbit, the star is located around 500 light years away. It is moving closer to the Earth with a heliocentric radial velocity of −8 km/s.[4]
This is an evolved K-type giant star with a stellar classification of K4 III,[3] which indicates it has consumed the hydrogen at its core and expanded. It has an estimated 0.57 times the mass of the Sun but with over 11 times the Sun's radius. The star is radiating 127 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,430 K.[5]
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