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  • TW Hydrae is an orange dwarf star approximately 176 light-years away in the constellation of Hydra (the Sea Serpent) TW Hydrae is similar in mass to the Sun, but is only about 5-10 million years old. — “TW Hydrae - Wikipedia, the free encyclopedia”,
  • 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. — “R Hydrae - Wikipedia, the free encyclopedia”,
  • Epsilon Hydrae (ε Hya, ε Hydrae) is a Class G5, third-magnitude star Epsilon Hydrae is a binary star with components of magnitudes 3.3 and 6.8, separated by. — “Epsilon Hydrae - Wikipedia, the free encyclopedia”,


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