Variable star in the constellation Cancer
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! style="text-align: center; background-color: #FFFFC0;" colspan="2" | Observation dataEpoch J2000      Equinox J2000
! style="text-align:left" | Constellation
! style="text-align:left" | Right ascension
! style="text-align:left" | Declination
! style="text-align:left" | Apparent magnitude (V)
! style="background-color: #FFFFC0; text-align: center;" colspan="2"| Characteristics
! style="text-align:left" | Spectral type
! style="text-align:left" | U−B 
! style="text-align:left" | B−V 
! style="text-align:left" | Variable type
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R Cancri is a Mira variable in the constellation Cancer. Located approximately distant, it varies between magnitudes 6.07 and 12.3 over a period of approximately 357 days. At its brightest, it is very faintly visible to the naked eye.
Friedrich Magnus Schwerd discovered R Cancri in 1829. It was one of the first variable stars to be discovered.
References.
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