Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Aquarius |
Right ascension | 22h 01m 05.01544s[1] |
Declination | +00° 36′ 16.9787″[1] |
Apparent magnitude (V) | 5.597[2] |
Characteristics | |
Spectral type | K2III[3] |
U−B color index | +1.40[4] |
B−V color index | +1.28[4] |
Astrometry | |
Radial velocity (Rv) | +8.12±0.1[5] km/s |
Proper motion (μ) | RA: +6.22[6] mas/yr Dec.: −11.05[6] mas/yr |
Parallax (π) | 5.7956 ± 0.1557 mas[1] |
Distance | 560 ± 20 ly (173 ± 5 pc) |
Details[7] | |
Mass | 1.47 M☉ |
Radius | 28.15+0.61 −0.93[1] R☉ |
Luminosity | 258±8[1] L☉ |
Surface gravity (log g) | 2.3 cgs |
Temperature | 4,361 K |
Age | 2.9 Gyr |
Other designations | |
Database references | |
SIMBAD | data |
28 Aquarii is a single[9] star located about 560 light years away from the Sun in the zodiac constellation of Aquarius. 28 Aquarii is the Flamsteed designation.[8] It is visible to the naked eye as a dim, orange-hued star with an apparent visual magnitude of 5.6.[2] This object is moving further from the Earth with a heliocentric radial velocity of +8.1 km/s.[5]
This 2.9[7] billion year old object is an aging giant star with a stellar classification of K2 III.[3] After exhausting the hydrogen at its core, this star evolved off the main sequence and has now expanded to 28[1] times the Sun's radius. It has 1.47 times the mass of the Sun and is radiating 258[1] times the Sun's luminosity from its swollen photosphere at an effective temperature of 4,361 K.[7]
Eggleton2008
was invoked but never defined (see the help page).