R Horologii
 R Horologii (R) in Horologium |
|
| Observation data Epoch J2000.0 Equinox J2000.0 |
|
|---|---|
| Constellation | Horologium |
| Right ascension | 02h 53m 52.77206s |
| Declination | −49° 53′ 22.7408″ |
| Apparent magnitude (V) | +3.92 |
| Characteristics | |
| Spectral type | M 5e–M 8eII/III |
| Variable type | Mira variable |
| Astrometry | |
| Radial velocity (Rv) | +60 ± 4.4 km/s |
| Proper motion (μ) |
RA: 130.35 ± 0.74 mas/yr Dec.: 34.22 ± 0.72 mas/yr |
| Parallax (π) | 4.76 ± 0.97mas |
| Distance | approx. 700 ly (approx. 210 pc) |
| Other designations | |
| Database references | |
| SIMBAD | data |
R Horologii (also known as HD 18242) is a red giant star approximately 700 light-years away in the constellation Horologium. It is also a Mira variable with a period of 404.83 days, and ranging from apparent magnitude 4.7 to 14.3—one of the largest ranges in brightness known.
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