42 Aquarii
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Aquarius |
| Right ascension | 22h 16m 48.04643s |
| Declination | −12° 49′ 53.1673″ |
| Apparent magnitude (V) | 5.34 |
| Characteristics | |
| Evolutionary stage | giant |
| Spectral type | K1 III |
| B−V color index | 1.132±0.001 |
| Astrometry | |
| Radial velocity (Rv) | +13.0±4.2 km/s |
| Proper motion (μ) | RA: +1.89 mas/yr Dec.: +5.03 mas/yr |
| Parallax (π) | 7.3032±0.1451 mas |
| Distance | 447 ± 9 ly (137 ± 3 pc) |
| Absolute magnitude (MV) | −0.93 |
| Details | |
| Mass | 3.14±0.27 M☉ |
| Radius | 11.24+0.23 −0.32 R☉ |
| Luminosity | 69.950±3.907 L☉ |
| Surface gravity (log g) | 2.90 cgs |
| Temperature | 4,980+71 −51 K |
| Metallicity [Fe/H] | +0.00±0.04 dex |
| Rotational velocity (v sin i) | 3.43 km/s |
| Age | 470±150 Myr |
| Other designations | |
| 42 Aqr, BD−13°6148, HD 211361, HIP 110000, HR 8496, SAO 164974 | |
| Database references | |
| SIMBAD | data |
42 Aquarii is a single star located 447 light years away from the Sun in the zodiac constellation of Aquarius. 42 Aquarii is its Flamsteed designation. It is visible to the naked eye as a faint, orange-hued star with an apparent visual magnitude of 5.34. This object is moving further from the Sun with a heliocentric radial velocity of around +13 km/s.
This object is an evolved giant star with a stellar classification of K1 III, most likely (82% chance) on the horizontal branch. It is around 470 million years old with a projected rotational velocity of 3.4 km/s. The star has over three times the mass of the Sun and has expanded to 11 times the Sun's radius. It is radiating 70 times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 4,980 K.