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Variable star in the constellation Horologium From Wikipedia, the free encyclopedia
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]
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][lower-alpha 1] 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 |