HD 223311 is a star in the equatorial constellation of Aquarius. It has an orange hue and is visible to the naked eye as a dim star with an apparent visual magnitude of 6.08.[2] Based on parallax measurements, the star is located at a distance of approximately 910 light years from the Sun. It is a radial velocity standard[9] star that is drifting closer to the Sun at the rate of −20 km/s.[3] The star is situated near the ecliptic and thus is subject to lunar occultations.[10]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Aquarius |
| Right ascension | 23h 48m 32.47911s[1] |
| Declination | −06° 22′ 49.5328″[1] |
| Apparent magnitude (V) | 6.08[2] |
| Characteristics | |
| Spectral type | K4III[3] |
| U−B color index | +1.71[2] |
| B−V color index | +1.452[3] |
| Variable type | suspected[4] |
| Astrometry | |
| Radial velocity (Rv) | −20.069±0.008[3] km/s |
| Proper motion (μ) | RA: +0.01[5] mas/yr Dec.: −19.04[5] mas/yr |
| Parallax (π) | 3.5950 ± 0.0884 mas[1] |
| Distance | 910 ± 20 ly (278 ± 7 pc) |
| Absolute magnitude (MV) | −0.80[6] |
| Details | |
| Radius | 40.78+3.27 −7.51[1] R☉ |
| Luminosity | 496±15[1] L☉ |
| Temperature | 4,267+457 −162[1] K |
| Metallicity [Fe/H] | −0.22±0.09[7] dex |
| Other designations | |
| Database references | |
| SIMBAD | data |
This is an aging K-type giant star with a stellar classification of K4III.[3] Having exhausted the supply of hydrogen at its core, it has cooled and expanded off the main sequence. At present it has 41[1] times the girth of the Sun. It is a suspected variable star of unknown type that has been measured ranging in brightness from magnitude 5.01 down to 5.26 in the infrared I band.[4] The star is radiating 496 times the luminosity of the Sun from its swollen photosphere at an effective temperature of 4,267 K.[1]