Definitions

hydrae

R Hydrae

R Hydrae is a Mira-type variable star in the constellation Hydra.

The magnitude of R Hydrae varies over a period of 389 days, between 3.21 and 11.00. The period of R Hydrae changes slowly.

At maximum brightness the star can be seen with the naked eye, while at minimum a telescope of at least 5 cm is needed.

R Hydrae is approximately 2000 light years from Earth and is of spectral class M7.

Coordinates for epoch J2000

References

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