Alfard (α Hya) - The brightest star of the constellation, located on the line connecting the stars Castor - Pollux of Gemini. Its remarkable orange color can certainly be noticed with the naked eye, and it belongs to the spectral class K3. This star has a magnitude of 2 and is located in an area relatively poor in stars. That is why its translated name from Arabic means "Lonely Star". However, Tycho de Brahe called it Cor Hydraul - "Heart of the Hydra". It is located at a distance of 177 light years and is 780 times more luminous than the Sun.

ε Hya - The main component with a brightness of 3.8mag has a companion with a brightness of 6.9mag at a separation of 2.8". To resolve this binary star, we need a telescope with an objective diameter of at least 8 cm. The components orbit each other every 870 years and are located at a distance of 129 light-years.

U Hya - One of the brightest and most unusual carbon stars, whose red color can be seen even in the smallest telescope. This is due to the abundance of carbon molecules in its atmosphere, which absorb blue light. U Hya is observed 4 degrees northwest of the star ν Hydra and belongs to the irregular variable stars, whose magnitude fluctuates regularly from 4.7mag to 6.2mag in a period of about 450 days. It is located approximately 680 light-years away.

τ1 Hya - The components with magnitudes of 4.8 and 8 lie at a separation of 65". It is an optical double star, which can be resolved even with a simple telescope.

54 Hya - The double star is composed of components with magnitudes 5.1 and 7.1, which can be easily distinguished even with small telescopes at a separation of 8.6". Notice the color of both stars, one is bright and the other is dark yellow.

R Hydrae - The red giant, one of the most famous Mira Ceti variable stars. It changes its apparent brightness from 3.5 mag to 10.9 mag in a period of 389.6 days, which astronomers first noticed in the 17th century. However, the period has likely shortened by about 100 days since then. It is approximately 700 light-years away and at its greatest maximum surpasses the luminosity of 7000 Suns.

P Hya - The easily distinguishable components of 5th magnitude and 6.9th magnitude are located at a separation of 4 arcminutes. Using a telescope with a 60mm objective diameter, we can determine that the fainter component has a 9.6 arcsecond companion of 9th magnitude.

V Hya - A rare example of a carbon star. It is a red giant with a low temperature that produces carbon. The star is very red, so it cannot be confused with any other. However, it has one catch: it irregularly changes its brightness between 6th and 12th magnitude in two main periods - 18 months and 18 years.

N Hya - nice pair of nearly equally bright yellow components, 5.8 magnitude, 5.9 magnitude, easily distinguishable in small telescopes, components are separated by 9.2". In the same field of view, we can also see one reddish-orange star, 8' northeast.