44 Aquarii is a single[10] star located 336[1] light years away from the Sun in the equatorial constellation of Aquarius. 44 Aquarii is its Flamsteed designation.[9] It is visible to the naked eye as a dim, yellow-hued star with an apparent visual magnitude of 5.75.[2] This body is moving away from the Earth with a heliocentric radial velocity of +7.4 km/s.[5]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Aquarius |
| Right ascension | 22h 17m 06.49946s[1] |
| Declination | –05° 23′ 13.8000″[1] |
| Apparent magnitude (V) | 5.75[2] |
| Characteristics | |
| Spectral type | G6 III[3] |
| U−B color index | +0.51[2] |
| B−V color index | +0.88[2] |
| Variable type | suspected[4] |
| Astrometry | |
| Radial velocity (Rv) | +7.4[5] km/s |
| Proper motion (μ) | RA: –6.05[6] mas/yr Dec.: +18.67[6] mas/yr |
| Parallax (π) | 9.7114 ± 0.0934 mas[1] |
| Distance | 336 ± 3 ly (103.0 ± 1.0 pc) |
| Absolute magnitude (MV) | +0.51[3] |
| Details | |
| Mass | 2.53[3] M☉ |
| Radius | 9.14+0.38 −0.34[1] R☉ |
| Luminosity | 53.169±0.628[1] L☉ |
| Surface gravity (log g) | 2.70[7] cgs |
| Temperature | 5,025[7] K |
| Metallicity [Fe/H] | –0.31[7] dex |
| Rotational velocity (v sin i) | 1.8±0.8[8] km/s |
| Age | 537[3] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
A stellar classification of G6 III[3] indicates this is an evolved giant star, most likely (98% chance) on the horizontal branch,[11] having exhausted the hydrogen at its core and expanded. It is a suspected variable star of unknown type.[4] 44 Aquarii is 537[3] million years old with about 2.53[3] times the mass of the Sun and 9[1] times the Sun's radius. The star is radiating 62[3] times the Sun's luminosity from its photosphere at an effective temperature of 5,025 K.[7] At this heat, the star has the golden-hued glow of a G-type star.