Back R Horologii AST R del Rellotge Catalan R Horologii Spanish آر ساعت Persian R Horologii French とけい座R星 Japanese R Horologii Slovak R Horologii Swedish 時鐘座R Chinese
 Location of R Horologii (R) in Horologium | |
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Horologium |
| Right ascension | 02h 53m 52.77010s[1] |
| Declination | −49° 53′ 22.7305″[1] |
| Apparent magnitude (V) | 4.7 – 14.3[2] |
| Characteristics | |
| Spectral type | M5-7e[3] |
| B−V color index | 1.044±0.011[4] |
| Variable type | Mira[5] |
| Astrometry | |
| Radial velocity (Rv) | +60.0±4.4[6] km/s |
| Proper motion (μ) | RA: +128.567 mas/yr[1] Dec.: +35.766 mas/yr[1] |
| Parallax (π) | 4.3236 ± 0.1524 mas[1] |
| Distance | 755.7+31.6 −6.0 ly (231.8+9.7 −9.3 pc)[7] |
| Details | |
| Mass | 0.94[8] M☉ |
| Radius | 635[9][a] R☉ |
| Luminosity | 8,500[9] L☉ |
| Surface gravity (log g) | −0.434[8] cgs |
| Temperature | 2,200[10][9] K |
| Metallicity [Fe/H] | +0.545[8] dex |
| Other designations | |
| Database references | |
| SIMBAD | data |
R Horologii is a red giant star approximately 760 light-years away in the southern constellation of Horologium.[13] It is a Mira variable with a period of 404.83 days,[14] ranging from apparent magnitude 4.7 to 14.3—one of the largest ranges in brightness known of stars in the night sky visible to the unaided eye.[2] The star is losing mass at the rate of 5.9×10−7 M☉·y−1.[10]
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