| |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Corona Borealis |
| Right ascension | 15h41m 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 | |
RR CrB, BD+39° 2901, HD 140297, HIP 76844, SAO 64848, GC 21108, TYC 3053-1035-1, 2MASS J15412622+3833266 | |
| 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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