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Hydrus Constellation

Hydrus (Pronounciation:Hide-rus, Abbrev:Hyi, Latin:Hydri) is a constellation, one of 88 constellations that the night sky is divided into. The sky is not divided up equally between the constellations. Hydrus takes up 243.035 sq. degrees of the night sky which equates to 0.59% of the night sky. The constellation gets its name as it name means The Water Snake . It was not one of the original constellations that had been devised by Ptolemy, instead it was created by Pieter Dirkszoon Keyser and Frederick de Houtman years later.

Hydrus is not a member of the Zodiac group of twelve constellations that appear when the Sun sets. Hydrus is a southern hemispheric constellation which means it can't be seen easily or at all from the northern hemisphere.

The brightest star in Hydrus is Beta Hydri. There are 11 Extrasolar Planets (Exoplanets) in this constellation that are detailed on this site.

Hydrus Star and Deep Space Object Count

The number of stars that have been catalogued as part of the Hipparcos Star Catalogue from Hydrus is 659. The number of stars that are of magnitude 6.0 or lower in the constellation is 20. The number of stars in the constellation that make up the outline is 7.

There are no deep space objects that were identified by Charles Messier in this constellation. There are no non-Messier deep space objects in this constellation that are covered at present on this site.

Stars of Interest

The nearest star to Earth is Beta Hydri which is roughly about 24.33 Light Years from the Earth. The nearest star to the Earth with an exoplanet is GJ 3021 which is about 57.07 Light Years. The furthest star that can be located in the constellation is HIP 120027 which is located about 108721 Light Years away from the Sun. The furthest figure is derived from either the 1997 or 2007 Hipparcos star catalogue parallax figure and it has been known to produce distances that are wrong.

The dimmest star that can be seen in Hydrus with the naked eye is Kappa Hydri. The dim star has an apparent magnitude of 5.99. The dimmest star that a person is able to see with their naked eye is 6.0 magnitude based on the table in the reference. Ref: University of Michigan

The caveat of these stars are that they are catalogued on this site. If you know of a star that is nearer or further then do let me know in the comments and I'll add it to the site. The stars mentioned are from the Hipparcos catalogue or have been added because of their special status.

There is no Greek Legend behind this constellation. It was created by Pieter Dirkszoon Keyser and Frederick de Houtman to fill in the voids in the astronomical charts.

Meteor Showers

There are 4 Meteor Showers that occur during the year within this constellation based on information gathered from Adam Mickiewicz University (Poland). The ones listed as the ones I've been able to find a date range for. For others if you have the time, you can visit the AMU site, obtains the SL value then use IMO tables to calculate the date. A lot of the Meteor Showers are weak and you need to do a lot of stargazing to spot them.

NameActivityPeak ActivityClosest Star
Alpha Hydrids15-30 Jan20/21 JanHead of Hydrus
Sigma HydridsDec 03 - Dec 15 Dec 12Minchir

Hydrus Facts


NameHydrus
AbbreviationHyi
Is a Zodiac Sign No
Brightest StarBeta Hydri
Area243.035 sq. deg.
Percentage of Night Sky0.59%
Size Position61st
Hemisphere Southern
Site Exoplanet Count11
Meteor Shower Count4
Nearest StarBeta Hydri
Nearest Star with Exoplanet(s)GJ 3021
Dimmest StarKappa Hydri
Furthest StarHIP 120027
Bright Star Count20
Hipparcos Star Count659
Main Star Count7
Messier Deep Space Object Count0
*Non-Messier Deep Space Object Count0
Bordering / Neighbouring / Surrounding ConstellationsEridanus
Phoenix
Tucana
Octans
Mensa
Dorado
Reticulum
Horologium

*Note: The number of Non-Messier Deep Space Object Count relates to how many are covered on this site not how many there are.


Hydrus Constellation Map


Hydrus Constellation Star Map

The map was generated using Night Vision, an awesome free application by Brian Simpson.

List of Stars with Exoplanets in Hydrus


StarDistance (Lt. Yrs.)Exoplanet CountDeclinationRight Ascension
HD 10180127.269-60d 30` 41.601h 37m 53.59
HD 20003142.872-72d 19` 18.703h 07m 37.78

List of Named Stars in Hydrus without Extrasolar Planets

As there's so many stars in the cosmos, not all the stars are listed here. The site has lots of stars not listed so if your star isn't listed and you know the Henry Draper or Hipparcos ID, type https://www.universeguide.com/star/ then followed by the HIPNNNNNN or HDNNNN where NNNNN is the number part of the name. The stars that I do list have either a traditional name, a bayer or other classification name.

StarDistance (Lt. Yrs.)DeclinationRight Ascension
Beta Hydri24.33-77d 15` 18.100h 25m 39.20
BN Hydri270.23-78d 59` 21.903h 07m 31.90
CN Hydri195.89-71d 14` 09.402h 45m 36.86
CT Hydri467.28-71d 39` 29.703h 45m 23.70
Delta Hydri139.68-68d 39` 33.902h 21m 45.02
Epsilon Hydri151.85-68d 16` 01.002h 39m 35.22
Eta Hydri218.75-67d 38` 50.901h 54m 56.01
Eta1 Hydri709.05-67d 56` 40.201h 52m 34.74
Gamma Hydri214.02-74d 14` 21.303h 47m 14.23
GJ 302157.07-79d 51` 03.700h 16m 11.24
Head of Hydrus71.79-61d 34` 11.701h 58m 45.87
Iota Hydri96.90-77d 23` 19.003h 15m 57.36
Kappa Hydri317.28-73d 38` 45.002h 22m 52.47
Lambda Hydri211.79-74d 55` 24.100h 48m 35.12
Mu Hydri283.87-79d 06` 33.302h 31m 40.12
Nu Hydri339.40-75d 04` 00.802h 50m 28.54
Pi1 Hydri776.58-67d 50` 29.602h 14m 14.50
Pi2 Hydri488.27-67d 44` 46.802h 15m 28.56
Sigma Hydri132.48-78d 20` 55.201h 55m 50.25
Tau1 Hydri393.92-79d 08` 53.701h 41m 21.29
Tau2 Hydri201.71-80d 10` 34.201h 47m 46.69
Theta Hydri514.45-71d 54` 09.003h 02m 15.40
Zeta Hydri284.36-67d 37` 00.202h 45m 32.53

Hydrus Constellation's Star Breakdown


Type Breakdown


TypeDescriptionCount
KLight Orange Star 3,700 - 5,200k205
FYellow-White 6,000 - 7,500k162
GYellow 5,200 - 6,000k147
AWhite 7,500 - 10,000k61
MRed Dwarf Star <3,700k36
BBlue-White 10,500 - 30,000k11

Size Breakdown


TypeDescriptionCount
IIINormal Giant289
VMain Sequence190
IVSubgiant100
IIBright Giant4
DDwarf Star1

Breakdown of Dwarf Stars by Type


TypeDescriptionCount
sdsd Type SubDwarf Star1

Breakdown of Carbon Stars by Type


TypeDescriptionCount
CC-Type Carbon Star2
SS-Type Carbon Star1


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