R Horologii

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R Horologii
Horologium constellation map.png
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
Spectral type M7IIIe
U−B color index  ?
B−V color index  ?
Variable type Mira variable
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[edit]

External links[edit]