4.5
Apparent Mag730
Distance (ly)M6-9e
Spectral Type2,600
Temperature (K)R Hydrae is a Mira variable in Hydra whose period has been decreasing over the past 300 years.
Stellar Data
Apparent Magnitude4.5
Absolute Magnitude-1.5
Distance730 light-years
Spectral TypeM6-9e
Temperature2,600 K
Luminosity5,000 L☉
Radius430 R☉
Mass1.5 M☉
Right Ascension13h 29m 42.8s
Declination-23° 16′ 52.8″
ConstellationHydra
Notable Facts
- R Hydrae's pulsation period has decreased from about 500 to 380 days over 300 years
- This period change may be caused by a helium shell flash
- The star varies between magnitudes 3 and 11