21 Hydrae

Above the horizon. Rise: 12:22 | Tran: 17:43 | Set: 23:05

Alt: 24.07° Az: 141.44° Direction: South-East

21 Hydrae is a variable giant star of spectral class A3 in the constellation of Hydra.

21 Hydrae visual magnitude is 6.11. Because of its faintness, 21 Hydrae is visible to the naked eye only from locations with very dark skies, while it is not visible at all from skies affected by light pollution.

DSS2 image of 21 Hydrae. The red arrow shows the motion of 21 Hydrae during the next 10000 years (-2.67 arcmin in Right Ascension and 3.17 arcmin in declination);

Celestial Coordinates

Apparent

Right Ascension 09h 13m 41s

Declination -07° 12’ 54”

Hour Angle 21h 39m 58s

Sidereal Time 06h 53m 40s

J2000

Right Ascension 09h 12m 25s

Declination -07° 06’ 34”

Galactic Coordinates

Galactic Longitude 237.55°

Galactic Latitude 26.95°

Finder Chart

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Finder chart for 21 Hydrae.

Magnitude, Color, Spectral Class

Color ⬤

Magnitude 6.11

Class Giant

Absolute magnitude 1.52

Spectral Type A3III

Color Index (B-V) 0.22

Temperature 8011K

The red dot in the diagram below shows where 21 Hydrae is situated in the Hertzsprung–Russell diagram.

H-R diagram showing the position of 21 Hydrae. Attribution: Richard Powell / CC BY-SA

Distance, Radial Speed, Proper Motion

21 Hydrae is distant 269.42 light years from the Sun and it is moving towards the Sun at the speed of 4 kilometers per second.

Distance (parsec) 82.64

Distance (light year) 269.42

Radial Speed -4 km/s

Proper Motion RA -0.016 arcsec/y

Proper Motion Dec 0.019"/y

Alternative Designations

Flamsteed designation 21 Hydrae

Henry Draper Catalogue HD79193

SAO Catalogue SAO136662

Hipparcos Catalogue HIP45184

Durchmusterung Catalogue BD-06 2845

General Catalogue of Variable Stars KW Hya

Visibility from Your Location

Today's 21 Hydrae rise, transit and set times from Greenwich, UK are the following (all times relative to the local timezone Europe/London):

Azimuth: 97.2° RISE 12:22

Max altitude: 31.3° TRANSIT 17:43

Azimuth: 262.8° SET 23:05

Set Location

Other stars in Hydra