R Horologii
 R Horologii (R) in Horologium | |
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Horologium |
| Right ascension | 02h 53m 52.77s |
| Declination | −49° 53′ 22.7″ |
| Apparent magnitude (V) | +4.7 |
| Characteristics | |
| Spectral type | M7IIIe |
| U−B color index | ? |
| B−V color index | ? |
| Variable type | Mira variable |
| Astrometry | |
| Radial velocity (Rv) | +60 km/s |
| Proper motion (μ) | RA: 131.21 mas/yr Dec.: 35.74 mas/yr |
| Parallax (π) | 3.25 ± 1.08 mas |
| Distance | 100 ly (31 pc) |
| Absolute magnitude (MV) | -2.7 |
| Other designations | |
HD 18242, HR 868 | |
R Horologii (also known as HD 18242) is a red giant star approximately 100 light-years away in the constellation Horologium. It is also a Mira variable with a period of 407.6 days, and has one of the largest magnitude ranges known (from 4.7 to 14.3).
See also
External links
- SIMBAD: HD 18242 -- Variable Star of Mira Cet type
- Light Curve of R Hor (R Horologii) from VSNET reports
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