List of stars in Hydrus
Encyclopedia
This is the list of notable star
Star
A star is a massive, luminous sphere of plasma held together by gravity. At the end of its lifetime, a star can also contain a proportion of degenerate matter. The nearest star to Earth is the Sun, which is the source of most of the energy on Earth...

s in the constellation
Constellation
In modern astronomy, a constellation is an internationally defined area of the celestial sphere. These areas are grouped around asterisms, patterns formed by prominent stars within apparent proximity to one another on Earth's night sky....

 Hydrus
Hydrus
Hydrus is a small constellation in the southern sky, created in the sixteenth century. Its name means "male water snake", and it should not be confused with Hydra, a much larger constellation which represents a female water snake.-History:...

, sorted by decreasing brightness.
Name B
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...

G.
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. Each star is assigned an integer , followed by " G. " , and then the Latin genitive of the constellation it lies in...

HD
Henry Draper Catalogue
The Henry Draper Catalogue 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 , published between 1925 and 1936, which gave classifications for 46,850 more stars, and by the...

HIP RA
Right ascension
Right ascension is the astronomical term for one of the two coordinates of a point on the celestial sphere when using the equatorial coordinate system. The other coordinate is the declination.-Explanation:...

Dec
Declination
In astronomy, declination is one of the two coordinates of the equatorial coordinate system, the other being either right ascension or hour angle. Declination in astronomy is comparable to geographic latitude, but projected onto the celestial sphere. Declination is measured in degrees north and...

vis.
mag.
Apparent magnitude
The apparent magnitude of a celestial body is a measure of its brightness as seen by an observer on Earth, adjusted to the value it would have in the absence of the atmosphere...

abs.
mag.
Absolute magnitude
Absolute magnitude is the measure of a celestial object's intrinsic brightness. it is also the apparent magnitude a star would have if it were 32.6 light years away from Earth...

Dist. (ly) Sp. class
Stellar classification
In astronomy, stellar classification is a classification of stars based on their spectral characteristics. The spectral class of a star is a designated class of a star describing the ionization of its chromosphere, what atomic excitations are most prominent in the light, giving an objective measure...

Notes
β Hyi
Beta Hydri
Beta Hydri is a star in the constellation Hydrus. It is about 24.4 light years away from Earth. It is larger and slightly more massive than the Sun....

 
β 5 2151 2021 2.82 3.45 24 G2IV nearby star
α Hyi
Alpha Hydri
Alpha Hydri is a star in the constellation Hydrus. It is sometimes informally known as the Head of Hydrus. It should not be confused with Alpha Hydrae in the constellation Hydra. Alpha Hydri is one of only three stars in the constellation Hydrus that is above the fourth visual magnitude...

 
α 24 12311 9236 2.86 1.16 71 F0V Head of Hydrus
γ Hyi  γ 62 24512 17678 3.26 −0.83 214 M2III Foo Pih
δ Hyi  δ 38 15008 11001 4.08 0.99 135 A3V
ε Hyi  ε 44 16978 12394 4.12 0.76 153 B9III
η2 Hyi  η2 21 11977 8928 4.68 0.57 217 G5III has a planet
Extrasolar planet
An extrasolar planet, or exoplanet, is a planet outside the Solar System. A total of such planets have been identified as of . It is now known that a substantial fraction of stars have planets, including perhaps half of all Sun-like stars...

 (b)
ν Hyi  ν 50 18293 13244 4.76 −0.26 329 K3III
ζ Hyi  ζ 47 17566 12876 4.83 0.05 295 A2IV/V
λ Hyi  λ 8 4815 3781 5.09 1.10 205 K5III
μ Hyi  μ 42 16522 11757 5.27 0.51 292 G4III
θ Hyi  θ 51 19400 14131 5.51 −0.52 525 B8III/IV
ι Hyi  ι 56 21024 15201 5.51 3.17 96 F4III
π1 Hyi  π1 35 14141 10418 5.57 −1.21 739 M1III
π2 Hyi  π2 36 14287 10513 5.67 −0.11 468 K2III
BN Hyi 55 20313 14521 5.67 1.26 248 F2II-III δ Sct variable
Delta Scuti variable
A Delta Scuti variable is a variable star which exhibits variations in its luminosity due to both radial and non-radial pulsations of the star's surface. Typical brightness fluctuations are from 0.003 to 0.9 magnitudes in V over a period of a few hours, although the amplitude and period of the...

15 10615 7921 5.70 0.42 371 K2/K3III
9 8810 6631 5.92 −1.53 1009 M0III
4 1801 1706 5.96 −0.69 697 K3III
59 21722 15968 5.96 2.99 128 F3V
κ Hyi  κ 39 15248 11095 5.99 1.05 318 K0III
12 9896 7387 6.03 3.00 132 F2V
τ2 Hyi  τ2 18 11604 8366 6.05 2.09 202 F0III
22 11995 8983 6.07 2.73 152 F0IV/V
26 12477 9318 6.09 0.50 428 K2III
14 10042 7271 6.11 0.46 441 G3IV
53 19940 14547 6.12 1.30 300 K1III
58 21563 15840 6.14 −0.17 595 A4:V+...
σ Hyi  σ 25 12363 8991 6.15 3.07 135 F5/F6IV/V
13 10052 7506 6.18 −0.78 805 M3III
CT Hyi  61 24188 17543 6.26 0.50 463 B8V α2 CVn variable
τ1 Hyi  τ1 17 10859 7879 6.33 0.91 395 G6/G8III
23 12270 9149 6.36 0.28 535 G8II/III
20 11944 8957 6.43 2.73 179 F2V
1 1221 1268 6.49 −0.18 704 G8/K0III
η1 Hyi  η1 19 11733 8751 6.77 −0.03 748 B9V
GJ 3021
GJ 3021
GJ 3021, formally cataloged as Gliese 3021, is a binary star system approximately 57 light-years away in the constellation of Hydrus ....

 
2 1237 1292 6.59 5.36 57 G8.5Vk has a planet (b
GJ 3021 b
GJ 3021 b is an extrasolar planet approximately 57 light-years away in the constellation of Hydrus. The planet is a Jupiter-like planet orbiting about 0.5 AU from its star with a minimum mass 3.37 times that of Jupiter, as determined by measuring variations in the radial velocity of the star...

)
HD 10180
HD 10180
HD 10180 is a solar-type star. A research team led by Christophe Lovis of the University of Geneva discovered that the star has at least five planets, and possibly as many as seven. It is 127 light-years away, in the southern constellation of Hydrus...

10180 7599 7.33 4.36 128 G1V has six confirmed planets (c, d, e, f, g and h) and one unconfirmed planet (b)
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