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110 relations: Absolute magnitude, Algol variable, Alpha2 Canum Venaticorum variable, Alphard, Apparent magnitude, Bayer designation, Be star, Beta Cephei variable, Beta Hydrae, Beta Lyrae variable, Brown dwarf, BY Draconis variable, Carbon star, Chi1 Hydrae, Chi2 Hydrae, Constellation, Cosmic distance ladder, Declination, Delta Hydrae, Delta Scuti variable, Epsilon Hydrae, Eta Hydrae, Exoplanet, F Hydrae, Flamsteed designation, Gamma Hydrae, Gliese 3634, Gliese 3634 b, Gliese 433, Gould designation, HD 100307, HD 122430, HD 122430 b, HD 70573, HD 70573 b, HD 72561, HD 72659, HD 72659 b, HD 74156, HD 74156 b, HD 74156 c, HD 76151, HD 81799, HD 82943, HD 82943 b, HD 82943 c, HD 83953, HD 84117, HD 85859, HD 85951, ..., HD 86226, HD 86226 b, HD 86264, HD 86264 b, HD 90156, HD 90156 b, HD 92036, HD 96700, HD 96819, Henry Draper Catalogue, Hipparcos, HR 4339, HR 4458, Hydra (constellation), Iota Hydrae, Kappa Hydrae, Lambda Hydrae, Light-year, Lists of stars by constellation, Mira variable, Mu Hydrae, Nu Hydrae, Omega Hydrae, Omicron Hydrae, Phi Hydrae, Phi1 Hydrae, Phi2 Hydrae, Pi Hydrae, Planet, Proper names (astronomy), Psi Hydrae, R Hydrae, Rho Hydrae, Right ascension, Sigma Hydrae, Star, Stellar classification, T Tauri star, Tau Hydrae, Theta Hydrae, Transit (astronomy), TW Hydrae, U Hydrae, Upsilon1 Hydrae, Upsilon2 Hydrae, V Hydrae, Variable star designation, Xi Hydrae, Zeta Hydrae, 12 Hydrae, 17 Crateris, 2 Sextantis, 26 Hydrae, 27 Hydrae, 30 Monocerotis, 51 Hydrae, 52 Hydrae, 58 Hydrae, 6 Hydrae, 9 Hydrae. Expand index (60 more) »
Absolute magnitude
Absolute magnitude is a measure of the luminosity of a celestial object, on a logarithmic astronomical magnitude scale.
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Algol variable
Algol variables or Algol-type binaries are a class of eclipsing binary stars that are related to the prototype member of this class, β Persei (Beta Persei, Algol) from an evolutionary point of view.
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Alpha2 Canum Venaticorum variable
An Alpha2 Canum Venaticorum variable (or α2 CVn variable) is a type of variable star.
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Alphard
Alphard, also designated Alpha Hydrae (α Hydrae, abbreviated Alpha Hya, α Hya) is the brightest star in the constellation of Hydra.
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Apparent magnitude
The apparent magnitude of a celestial object is a number that is a measure of its brightness as seen by an observer on Earth.
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Bayer designation
A Bayer designation is a stellar designation in which a specific star is identified by a Greek letter, followed by the genitive form of its parent constellation's Latin name.
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Be star
Be Stars are a heterogeneous set of stars with B spectral types and emission lines.
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Beta Cephei variable
Beta Cephei variables, also known as Beta Canis Majoris stars, are variable stars that exhibit small rapid variations in their brightness due to pulsations of the stars' surfaces, thought due to the unusual properties of iron at temperatures of 200,000 K in their interiors.
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Beta Hydrae
Beta Hydrae (Beta Hya, β Hydrae, β Hya) is a double star in the constellation of Hydra.
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Beta Lyrae variable
Beta Lyrae variables are a class of close binary stars.
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Brown dwarf
Brown dwarfs are substellar objects that occupy the mass range between the heaviest gas giant planets and the lightest stars, having masses between approximately 13 to 75–80 times that of Jupiter, or approximately to about.
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BY Draconis variable
BY Draconis variables are variable stars of late spectral types, usually K or M, and typically belong to the main sequence.
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Carbon star
A carbon star is typically an asymptotic giant branch star, a luminous red giant, whose atmosphere contains more carbon than oxygen; the two elements combine in the upper layers of the star, forming carbon monoxide, which consumes all the oxygen in the atmosphere, leaving carbon atoms free to form other carbon compounds, giving the star a "sooty" atmosphere and a strikingly ruby red appearance.
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Chi1 Hydrae
Chi1 Hydrae (χ1 Hya) is a binary star in the equatorial constellation of Hydra.
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Chi2 Hydrae
Chi2 Hydrae is a binary star system in the equatorial constellation of Hydra.
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Constellation
A constellation is a group of stars that are considered to form imaginary outlines or meaningful patterns on the celestial sphere, typically representing animals, mythological people or gods, mythological creatures, or manufactured devices.
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Cosmic distance ladder
The cosmic distance ladder (also known as the extragalactic distance scale) is the succession of methods by which astronomers determine the distances to celestial objects.
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Declination
In astronomy, declination (abbreviated dec; symbol δ) is one of the two angles that locate a point on the celestial sphere in the equatorial coordinate system, the other being hour angle.
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Delta Hydrae
Delta Hydrae, Latinized from δ Hydrae, is a double star in the equatorial constellation of Hydra.
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Delta Scuti variable
A Delta Scuti variable (sometimes termed dwarf cepheid) is a variable star which exhibits variations in its luminosity due to both radial and non-radial pulsations of the star's surface.
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Epsilon Hydrae
Epsilon Hydrae (ε Hydrae, abbreviated Epsilon Hya, ε Hya) is a is a multiple star system of a combined third magnitude in the constellation of Hydra.
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Eta Hydrae
Eta Hydrae (η Hya) is the Bayer designation for a star in the equatorial constellation of Hydra.
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Exoplanet
An exoplanet or extrasolar planet is a planet outside our solar system.
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F Hydrae
F Hydrae, also known as HD 74395, is a star in the constellation Hydra with an apparent magnitude is 4.64.
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Flamsteed designation
A Flamsteed designation is a combination of a number and constellation name that uniquely identifies most naked eye stars in the modern constellations visible from southern England.
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Gamma Hydrae
Gamma Hydrae (γ Hya, γ Hydrae) is a star in the equatorial constellation of Hydra.
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Gliese 3634
Gliese 3634 (Often shortened to GJ 3634) is a red dwarf star in the Hydra constellation.
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Gliese 3634 b
Gliese 3634 b (commonly shortened to GJ 3634 b) is a super-Earth exoplanet in the orbit of the nearby red dwarf Gliese 3634 at approximately 64.5 light-years in constellation Hydra.
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Gliese 433
Gliese 433 is a dim red dwarf star in the constellation of Hydra, roughly 29.5 light years away from the Sun.
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Gould designation
Gould designations for stars are similar to Flamsteed designations in the way that they number stars within a constellation in increasing order of right ascension.
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HD 100307
HD 100307 is a suspected variable star in the constellation of Hydra.
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HD 122430
HD 122430 is an orange giant star about 440 light years away in the constellation of Hydra on the celestial sphere.
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HD 122430 b
HD 122430 b is a giant planet orbiting around the giant star HD 122430.
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HD 70573
HD 70573 is a 9th magnitude star approximately 149 light-years away in the constellation of Hydra.
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HD 70573 b
HD 70573 b is a superjovian planet orbiting the youngest RV host star HD 70573 approximately 149 light-years away in the constellation of Hydra.
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HD 72561
HD 72561 is a star in the constellation Hydra.
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HD 72659
HD 72659 is a yellow dwarf star in the Hydra constellation.
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HD 72659 b
HD 72659 b is a superjovian exoplanet massing at least 3.3 MJ orbiting at 4.77 AU from the star taking 3630 days to orbit.
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HD 74156
HD 74156 is a yellow dwarf star (spectral type G0V) in the constellation of Hydra, 210 light years from the Solar System.
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HD 74156 b
HD 74156 b is an extrasolar planet at least 1.88 times the mass of Jupiter that orbits the star HD 74156.
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HD 74156 c
HD 74156 c is an extrasolar planet at least eight times the mass of Jupiter orbiting the star HD 74156.
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HD 76151
HD 76151 is a G-type main sequence star in the constellation of Hydra.
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HD 81799
HD 81799 is a star in the constellation Hydra.
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HD 82943
HD 82943 (164 G. Hydrae) is a yellow dwarf star approximately 89 light-years away in the constellation of Hydra.
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HD 82943 b
HD 82943 b is an extrasolar planet approximately 89 light-years away in the constellation of Hydra.
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HD 82943 c
HD 82943 c is an extrasolar planet approximately 89 light-years away in the constellation of Hydra.
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HD 83953
HD 83953 is a star in the constellation Hydra.
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HD 84117
HD 84117 is a F-type main sequence star in the constellation of Hydra.
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HD 85859
HD 85859 is a star in the constellation Hydra.
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HD 85951
HD 85951, also designated HR 3923 and named Felis, is a star in the constellation of Hydra.
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HD 86226
HD 86226 is a G type yellowish white star found in the constellation of Hydra.
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HD 86226 b
This planet is a likely gas giant discovered by the Magellan Planet Search Program in 2010.
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HD 86264
HD 86264 is a 7th magnitude F-type main sequence star located approximately 224 light years away in the constellation Hydra.
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HD 86264 b
HD 86264 b is an extrasolar planet which orbits the F-type main sequence star HD 86264, located approximately 237 light years away in the constellation Hydra.
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HD 90156
HD 90156 is a 7th magnitude G-type main sequence star located approximately 73 light years away in the constellation Hydra.
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HD 90156 b
HD 90156 b is an extrasolar planet which orbits the G-type main sequence star HD 90156, located approximately 73 light years away in the constellation Hydra.
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HD 92036
HD 92036 is a star in the constellation Hydra.
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HD 96700
HD 96700 is the Henry Draper Catalogue designation for a star in the equatorial constellation of Hydra.
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HD 96819
HD 96819 is a variable star in the constellation of Hydra.
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Henry Draper Catalogue
The Henry Draper Catalogue (HD) is an astronomical star catalogue published between 1918 and 1924, giving spectroscopic classifications for 225,300 stars; it was later expanded by the Henry Draper Extension (HDE), published between 1925 and 1936, which gave classifications for 46,850 more stars, and by the Henry Draper Extension Charts (HDEC), published from 1937 to 1949 in the form of charts, which gave classifications for 86,933 more stars.
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Hipparcos
Hipparcos was a scientific satellite of the European Space Agency (ESA), launched in 1989 and operated until 1993.
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HR 4339
HR 4339, once known as Beta Antliae, is a main sequence star in the constellation Hydra.
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HR 4458
HR 4458 (289 G. Hydrae) is a binary star system in the constellation Hydra.
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Hydra (constellation)
Hydra is the largest of the 88 modern constellations, measuring 1303 square degrees.
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Iota Hydrae
Iota Hydrae (ι Hydrae, abbreviated Iota Hya, ι Hya), also named Ukdah, is a star in the constellation of Hydra, about 8° to the north-northwest of Alphard (Alpha Hydrae) and just to the south of the celestial equator.
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Kappa Hydrae
κ Hydrae, Latinised as Kappa Hydrae, is a solitary star in the equatorial constellation of Hydra.
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Lambda Hydrae
λ Hydrae, Latinised as Lambda Hydrae, is a spectroscopic binary star in the constellation Hydra.
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Light-year
The light-year is a unit of length used to express astronomical distances and measures about 9.5 trillion kilometres or 5.9 trillion miles.
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Lists of stars by constellation
All stars but one can be associated with an IAU constellation.
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Mira variable
Mira variables ("Mira", Latin, adj. - feminine form of adjective "wonderful"), named for the prototype star Mira, are a class of pulsating variable stars characterized by very red colours, pulsation periods longer than 100 days, and amplitudes greater than one magnitude in infrared and 2.5 magnitude at visual wavelengths.
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Mu Hydrae
μ Hydrae, Latinised as Mu Hydrae, is a solitary, orange-hued star in the equatorial constellation of Hydra.
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Nu Hydrae
Nu Hydrae, Latinized from ν Hydrae, is an orange-hued star in the constellation Hydra, near the border with the neighboring constellation of Crater.
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Omega Hydrae
Omega Hydrae, Latinized from ω Hydrae, is a golden-hued star in the equatorial constellation of Hydra, located to the west-southwest of the brighter star Zeta Hydrae.
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Omicron Hydrae
Omicron Hydrae (ο Hya) is the Bayer designation for a solitary star in the equatorial constellation Hydra.
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Phi Hydrae
The Bayer designation Phi Hydrae (φ Hya / φ Hydrae) is shared by three star systems, in the constellation Hydra.
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Phi1 Hydrae
Phi1 Hydrae, Latinized from φ1 Hydrae, is a yellow-hued star in the constellation Hydra.
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Phi2 Hydrae
Phi2 Hydrae, Latinized from φ2 Hydrae, is a star in the constellation Hydra.
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Pi Hydrae
Pi Hydrae (π Hya, π Hydrae) is a star in the constellation Hydra with an apparent visual magnitude of 3.3, making it visible to the naked eye.
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Planet
A planet is an astronomical body orbiting a star or stellar remnant that is massive enough to be rounded by its own gravity, is not massive enough to cause thermonuclear fusion, and has cleared its neighbouring region of planetesimals.
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Proper names (astronomy)
Some astronomical objects have proper names (common names, popular names, traditional names); as opposed to catalogue numbers or other systematic designations.
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Psi Hydrae
Psi Hydrae (ψ Hya) is a star in the equatorial constellation of Hydra.
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R Hydrae
R Hydrae, also known as R Hya, is a Mira-type variable star in the constellation Hydra.
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Rho Hydrae
Rho Hydrae, Latinized from ρ Hya, is a binary star in the equatorial constellation of Hydra.
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Right ascension
Right ascension (abbreviated RA; symbol) is the angular distance measured only eastward along the celestial equator from the Sun at the March equinox to the (hour circle of the) point above the earth in question.
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Sigma Hydrae
Sigma Hydrae (σ Hydrae, abbreviated Sig Hya, σ Hya), also named Minchir, is a solitary star in the equatorial constellation of Hydra.
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Star
A star is type of astronomical object consisting of a luminous spheroid of plasma held together by its own gravity.
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Stellar classification
In astronomy, stellar classification is the classification of stars based on their spectral characteristics.
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T Tauri star
T Tauri stars (TTS) are a class of variable stars associated with youth.
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Tau Hydrae
The Bayer designation Tau Hydrae (τ Hya, τ Hydrae) is shared by two star systems in the equatorial constellation of Hydra.
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Theta Hydrae
Theta Hydrae, Latinized from θ Hydrae, is a binary star system in the constellation Hydra.
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Transit (astronomy)
In astronomy, a transit or astronomical transit is the phenomenon of at least one celestial body appearing to move across the face of another celestial body, hiding a small part of it, as seen by an observer at some particular vantage point.
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TW Hydrae
TW Hydrae is a T Tauri star approximately 194 light-years away in the constellation of Hydra (the Sea Serpent).
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U Hydrae
U Hydrae (U Hya) is a carbon star in the constellation Hydra.
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Upsilon1 Hydrae
Upsilon¹ Hydrae (υ¹ Hydrae, abbreviated Ups¹ Hya, υ¹ Hya), also named Zhang, is a yellow-hued star in the constellation of Hydra.
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Upsilon2 Hydrae
Upsilon2 Hydrae, Latinized from υ2 Hydrae, is a solitary star in the equatorial constellation of Hydra.
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V Hydrae
V Hydrae (V Hya) is a carbon star in the constellation Hydra.
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Variable star designation
Variable stars are designated using a variation on the Bayer designation format of an identifying label (as described below) combined with the Latin genitive of the name of the constellation in which the star lies.
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Xi Hydrae
Xi Hydrae, Latinized from ξ Hydrae, is a solitary star in the equatorial constellation of Hydra.
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Zeta Hydrae
Zeta Hydrae (ζ Hya, ζ Hydrae) is a solitary star in the equatorial constellation of Hydra.
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12 Hydrae
12 Hydrae (12 Hya) is a star in the constellation Hydra.
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17 Crateris
17 Crateris (17 Crt) is a binary star in the constellation Hydra.
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2 Sextantis
2 Sextantis (2 Sex) is a star in the constellation Hydra.
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26 Hydrae
26 Hydrae (26 Hya) is a star in the constellation Hydra.
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27 Hydrae
27 Hydrae is an evolved yellow giant star in the constellation of Hydra.
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30 Monocerotis
30 Monocerotis (30 Mon) is a star in the constellation Hydra.
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51 Hydrae
51 Hydrae (51 Hya) is a star in the constellation Hydra.
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52 Hydrae
52 Hydrae (52 Hya) is a double star in the constellation Hydra.
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58 Hydrae
58 Hydrae (58 Hya) is a star in the constellation Hydra.
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6 Hydrae
6 Hydrae (6 Hya) is a star in the constellation Hydra.
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9 Hydrae
9 Hydrae (9 Hya) is a star in the constellation Hydra.
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References
[1] https://en.wikipedia.org/wiki/List_of_stars_in_Hydra
