Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Corona Borealis |
Right ascension | 15h 41m 26.22899s[2] |
Declination | +38° 33′ 26.5958″[2] |
Apparent magnitude (V) | 7.3 - 8.2[3] |
Characteristics | |
Spectral type | M5III[4] (M3 - M6[3]) |
Variable type | SRb[3] |
Astrometry | |
Radial velocity (Rv) | -58.39[5] km/s |
Proper motion (μ) | RA: 20.24[2] mas/yr Dec.: -32.44[2] mas/yr |
Parallax (π) | 2.93 ± 0.53 mas[2] |
Distance | approx. 1,100 ly (approx. 340 pc) |
Details | |
Luminosity | 2,180[6] L☉ |
Temperature | 3,309[6] K |
Other designations | |
Database references | |
SIMBAD | data |
RR Coronae Borealis (RR CrB, HD 140297, HIP 76844) is a M3-type semiregular variable star located in the constellation Corona Borealis with a parallax of 2.93mas being a distance of 341 parsecs (1,110 ly). It varies between magnitudes 7.3 and 8.2 over 60.8 days.[3] Located around 1228 light-years distant, it shines with a luminosity approximately 2180 times that of the Sun and has a surface temperature of 3309 K.[6]
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