R Hydrae, abbreviated R Hya, is a single star in the equatorial constellation of Hydra, about 2.7° to the east of Gamma Hydrae. It is a Mira-type variable...

became the proper name of Epsilon Hydrae since 1 June 2018 by IAU. Hydra is also home to several variable stars. R Hydrae is a Mira variable star 2000 light-years...

see it in a few of the several thousand Mira stars known, possibly in R Hydrae. Most Mira variables do exhibit slight cycle-to-cycle changes in period...

heliosphere. In 2006, a far infrared bow shock was detected near the AGB star R Hydrae. Bow shocks are also a common feature in Herbig Haro objects, in which...

Alphard /ˈælfɑːrd/, designated Alpha Hydrae (α Hydrae, abbreviated Alpha Hya, α Hya), is the brightest star in the constellation of Hydra. It is a single...

represents the velocity of the solar wind: R C F = R P ( B s u r f 2 μ 0 ρ V S W 2 ) 1 6 {\displaystyle R_{\rm {CF}}=R_{\rm {P}}\left({\frac {B_{\rm {surf}}^{2}}{\mu...

TW Hydrae is a T Tauri star approximately 196 light-years away in the constellation of Hydra (the Sea Serpent). TW Hydrae is about 80% of the mass of the...

a solar eclipse belongs to the Sun not to the Moon, and he discovered R Hydrae as a variable star. He also helped with the survey based on the Paris Meridian...

aavso.org. Retrieved 2022-08-29. Guinan, Edward F.; Eaton, J. A.; Wasatonic, R.; Stewart, H.; Engle, S. G.; McCook, G. P. (November 2010). "Times-Series...

Calendarium of Al Achsasi Al Mouakket Star Name - R.H.Allen p. 238 Star Name - R.H.Allen p. 182 Star Name - R.H.Allen p. 246 Van Altena W. F.; Lee J. T.; Hoffleit...

lower temperatures but with radii reaching up to many tens of thousands of R☉, comparable to some of the largest known black holes. The angular diameters...

Epsilon Hydrae, Delta Hydrae, Sigma Hydrae, Eta Hydrae, Rho Hydrae, Zeta Hydrae, Omega Hydrae and Theta Hydrae Consequently, Epsilon Hydrae itself is...

variability in 1784. Chi Cygni was identified in 1686 by G. Kirch, then R Hydrae in 1704 by G. D. Maraldi. By 1786, ten variable stars were known. John...

Gamma Hydrae (γ Hya, γ Hydrae) is a binary star in the equatorial constellation of Hydra. It has an apparent visual magnitude of 3.0, placing it second...

The Bayer designation Tau Hydrae (τ Hya, τ Hydrae) is shared by two star systems in the equatorial constellation of Hydra. The two stars are separated...

of Sigma Hydrae, Delta Hydrae, Eta Hydrae, Rho Hydrae, Epsilon Hydrae, Zeta Hydrae, Omega Hydrae and Theta Hydrae. Consequently, Sigma Hydrae itself is...

Beta Hydrae, Latinized from β Hydrae, is a double star in the equatorial constellation of Hydra. Historically, Beta Hydrae was designated 28 Crateris...

V Hydrae (V Hya) is a carbon star in the constellation Hydra. To date perhaps uniquely in our galaxy it has plasma ejections/eruptions on a grand scale...

asterism consisting of δ Hydrae, σ Hydrae, η Hydrae, ρ Hydrae, ε Hydrae, ζ Hydrae, ω Hydrae and θ Hydrae Consequently, δ Hydrae itself is known as 柳宿一 (Liǔ...

U Hydrae is a single star in the equatorial constellation of Hydra, near the northern constellation border with Sextans. It is visible to the naked eye...

spectral type of M8, it is very young, and probably a member of the TW Hydrae association. Its estimated mass is around 25 Jupiter masses. The companion...

Sun. ι Hydrae (Latinised to Iota Hydrae) is the star's Bayer designation. This star along with Tau¹ Hydrae, Tau² Hydrae and 33 Hydrae (A Hydrae), were...

Tau1 Hydrae is a triple star system in the equatorial constellation of Hydra. Based upon the annual parallax shift of the two visible components as seen...

consisting of Upsilon1 Hydrae, Lambda Hydrae, Mu Hydrae, HD 87344, Kappa Hydrae and Phi1 Hydrae. Consequently, Upsilon1 Hydrae itself is known as 張宿一...

Hydrae is a single variable star in the equatorial constellation of Hydra. It is sometimes identified as Gl 355 from the Gliese Catalogue; LQ Hydrae is...

HS Hydrae is a triple star system in the equatorial constellation of Hydra. The inner pair were an eclipsing binary during the period 1920 until 2019,...

W Hydrae is a Mira-type variable star in the constellation Hydra. The star is nearly located within the Solar neighborhood, between 75 and 120 parsecs...

Tau2 Hydrae is a probable astrometric binary star system in the equatorial constellation of Hydra. Based upon an annual parallax shift of 6.30 mas as seen...

asterism consisting of ρ Hydrae, δ Hydra, σ Hydrae, η Hydrae, ε Hydrae, ζ Hydrae, ω Hydrae and θ Hydrae Consequently, ρ Hydrae itself is known as 柳宿四 (Liǔ...

TW Hydrae b is a likely extrasolar planet orbiting the young T Tauri star TW Hydrae approximately 176 light-years (54 parsecs, or nearly 1.665×1016 km)...