Hydrus
the Male Water Snake
the Male Water Snake
Fixed J2000 coordinates
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How to read this chart
Dots mark stars, and their sizes indicate brightness. Stars appear dark on light charts and light on dark charts. Green lines show a constellation pattern. The surrounding grid gives right ascension and declination.
This is a fixed reference map, rather than a view of tonight’s sky.
Read the full chart guide →Boundary coordinates
The boundary marks a sky region; it is separate from the green star pattern. These files preserve ordered coordinate points in the J2000 reference system.
View coordinate format & sample
Right ascension uses hours, minutes and seconds. Declination is in degrees. Convert right ascension to degrees with 15 × (hours + minutes/60 + seconds/3600).
RA (h m s) | Dec (degrees) | Abbreviation 04 35 10.5645 | -67.2479248 | HYI 04 34 19.5657 | -69.7467194 | HYI 04 31 49.7964 | -74.7431641 | HYI 03 28 18.1877 | -74.5741272 | HYI 03 20 21.9973 | -82.0644531 | HYI
The 0h / 24h meridian is continuous. A coordinate jump there should not be treated as a straight line across a flat map.