| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Cancer |
| Right ascension | 08h 16m 33.82673s[2] |
| Declination | +11° 43′ 34.4691″[2] |
| Apparent magnitude (V) | 6.07 - 12.3[3] |
| Characteristics | |
| Spectral type | M6e-M9e[3] |
| U−Bcolor index | 0.49[4] |
| B−Vcolor index | 1.53[4] |
| Variable type | Mira[3] |
| Astrometry | |
| Radial velocity (Rv) | 35.42 ± 0.52[5] km/s |
| Proper motion (μ) | RA: 0.635±0.195[2]mas/yr Dec.: −10.785±0.106[2]mas/yr |
| Parallax (π) | 3.9375±0.1792 mas[2] |
| Distance | 854+36 −39 ly (262+11 −12 pc)[6] |
| Details | |
| Mass | 1.43[7] M☉ |
| Radius | 371±37[8] R☉ |
| Luminosity | 5,700[8][a] L☉ |
| Surface gravity (log g) | −0.69[7] cgs |
| Temperature | 2,604±300[8] K |
| Metallicity[Fe/H] | +0.22[7] dex |
| Other designations | |
| BD+12°1803,HD 69243,HIP 40534,HR 3248,SAO 97694 | |
| Database references | |
| SIMBAD | data |
R Cancri is aMira variable in the constellationCancer. Located approximately 250 parsecs (830 ly) distant, it varies between magnitudes 6.07 and 12.3 over a period of approximately 357 days.[3] At its brightest, it is very faintly visible to thenaked eye.
Friedrich Magnus Schwerd discovered R Cancri in 1829.[9] It was one of the firstvariable stars to be discovered.[10]
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