| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Aquarius[1] |
| Right ascension | 21h 14m 37.04896s[2] |
| Declination | +00° 05′ 32.1202″[2] |
| Apparent magnitude (V) | 6.39[3] |
| Characteristics | |
| Evolutionary stage | AGB[4] |
| Spectral type | M1 III[5] |
| U−Bcolor index | +1.937[3] |
| B−Vcolor index | +1.608[3] |
| Variable type | Suspected[6] |
| Astrometry | |
| Radial velocity (Rv) | −123.5[5] km/s |
| Proper motion (μ) | RA: +35.471[2]mas/yr Dec.: −13.260[2]mas/yr |
| Parallax (π) | 3.4472±0.0290 mas[2] |
| Distance | 946 ± 8 ly (290 ± 2 pc) |
| Absolute magnitude (MV) | −0.88[1] |
| Details | |
| Mass | 1.9[7] M☉ |
| Radius | 50[8] R☉ |
| Luminosity | 693[1] L☉ |
| Surface gravity (log g) | 1.68[7] cgs |
| Temperature | 3,933[7] K |
| Metallicity[Fe/H] | −0.23[7] dex |
| Other designations | |
| BD−00°4186,HD 202259,HIP 104872,HR 8121,NSV 13614,SAO 145229. | |
| Database references | |
| SIMBAD | data |
| Data sources: | |
| Hipparcos Catalogue, CCDM (2002), Bright Star Catalogue (5th rev. ed.) | |
HD 202259 is a suspectedvariable star in the equatorialconstellation ofAquarius. With anapparent magnitude of 6.39, according to theBortle scale it is faintly visible to the naked eye from dark rural skies. It has astellar classification of M1 III, and is ared giant located along theasymptotic giant branch of theHR diagram. Located about 946 light years away, itsradial velocity of −123.5 km/s indicates this is ahigh-velocity star.[9]
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 | This giant-star-related article is astub. You can help Wikipedia byadding missing information. |
 | This variable star–related article is astub. You can help Wikipedia byadding missing information. |
