| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Aquarius |
| Right ascension | 22h16m 48.04643s[1] |
| Declination | −12° 49′ 53.1673″[1] |
| Apparent magnitude (V) | 5.34[2] |
| Characteristics | |
| Evolutionary stage | giant |
| Spectral type | K1 III[3] |
| B−V color index | 1.132±0.001[2] |
| Astrometry | |
| Radial velocity (Rv) | +13.0±4.2[2] km/s |
| Proper motion (μ) | RA: +1.89[4] mas/yr Dec.: +5.03[4] mas/yr |
| Parallax (π) | 7.3032 ± 0.1451 mas[1] |
| Distance | 447 ± 9 ly (137 ± 3 pc) |
| Absolute magnitude (MV) | −0.93[2] |
| Details | |
| Mass | 3.14±0.27[5] M☉ |
| Radius | 11.24+0.23 −0.32[1] R☉ |
| Luminosity | 69.950±3.907[1] L☉ |
| Surface gravity (log g) | 2.90[6] cgs |
| Temperature | 4,980+71 −51[1] K |
| Metallicity [Fe/H] | +0.00±0.04[2] dex |
| Rotational velocity (v sin i) | 3.43[6] km/s |
| Age | 470±150[5] Myr |
| Other designations | |
42 Aqr, BD−13°6148, HD 211361, HIP 110000, HR 8496, SAO 164974[7] | |
| Database references | |
| SIMBAD | data |
42 Aquarii is a single[8] star located 447 light years away from the Sun in the zodiac constellationofAquarius. 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.[2] This object is moving further from the Sun with a heliocentric radial velocity of around +13 km/s.[2]
This object is an evolved giant star with a stellar classification of K1 III,[3] most likely (82% chance) on the horizontal branch.[5] It is around 470[5] million years old with a projected rotational velocity of 3.4 km/s.[6] The star has over three[5] times the mass of the Sun and has expanded to 11[1] times the Sun's radius. It is radiating 70[1] times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 4,980 K.[1]
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