The ISDORA collection
One star.
A story of your own.
Real stars. Names that mean something. Explore the sky from your location and find a place for your dedication.
Hipparcos V ≤ 9 and a documented SIMBAD / CDS selection. Discover their stories and the tools to observe them.
Hydra · Binary system
27 Hya · visual A/B
G8III + F4V · ≈ 243.6 light years
Available
Discover this star →ISDORA · Observatory
Your window to the universe
Discover its nature. Find it in your sky.
Animated artistic 3D model. Drag to rotate; +/− keys to zoom and 0 to reset. Corona and activity are exaggerated, not measured for this star. exaggerated colours and sizes based on spectral class. Diameters and separation are not to scale; animation is not a calculated orbit. An individual star may belong to a multiple system.
01 · Your place and time
From where you are
Initial location: Madrid. Change it to your location; Your location is used to calculate the sky and is sent to the server when filtering the catalogue. When you open the map, OpenStreetMap receives requests for the area you view.
After choosing on the map or using GPS, check the time zone. City search updates it automatically.
02 · The sky in front of you
Drag to look around; wheel or buttons to zoom. North = 0°, east = 90°. Gold: available candidate; grey: registered; white: reference stars. Select a gold marker or use the cards. Geometric horizon, without buildings, terrain, clouds or light pollution. Bright-star backdrop, not a complete catalogue.
SIMBAD / CDS · ICRS J2000 · Proper motion and precession; approximate orientation.
03 · Through the telescope
The atlas loads third-party astronomical imagery from CDS and its survey providers only when opened.