2 Hydrae

Above the horizon. Rise: 12:03 | Tran: 17:41 | Set: 23:18

Alt: 26.20° Az: 221.82° Direction: South-West

2 Hydrae is a variable and double giant star of spectral class A5 in the constellation of Hydra.

2 Hydrae visual magnitude is 5.59. Because of its faintness, 2 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 2 Hydrae. The red arrow shows the motion of 2 Hydrae during the next 10000 years (-8.83 arcmin in Right Ascension and -10.17 arcmin in declination);

Celestial Coordinates

Apparent

Right Ascension 08h 27m 43s

Declination -04° 04’ 19”

Hour Angle 02h 27m 26s

Sidereal Time 10h 55m 09s

J2000

Right Ascension 08h 26m 27s

Declination -03° 59’ 14”

Galactic Coordinates

Galactic Longitude 227.96°

Galactic Latitude 19.02°

Finder Chart

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Finder chart for 2 Hydrae.

Magnitude, Color, Spectral Class

Color ⬤

Magnitude 5.59

Class Giant

Absolute magnitude 1.96

Spectral Type A5III

Color Index (B-V) 0.22

Temperature 8011K

The red dot in the diagram below shows where 2 Hydrae is situated in the Hertzsprung–Russell diagram.

H-R diagram showing the position of 2 Hydrae. Attribution: Richard Powell / CC BY-SA

Star System Properties

2 Hydrae is a visual double star which can be observed with binoculars or small telescopes. The table below shows key information about the 2 Hydrae double sysyem:

Main star magnitude 5.59

Secondary star magnitude 9.39

Magnitude difference 3.8

Separation 72.8 arcsec

Distance, Radial Speed, Proper Motion

2 Hydrae is distant 173.13 light years from the Sun and it is moving far from the Sun at the speed of 27 kilometers per second.

Distance (parsec) 53.11

Distance (light year) 173.13

Radial Speed 27 km/s

Proper Motion RA -0.053 arcsec/y

Proper Motion Dec -0.061"/y

Alternative Designations

Flamsteed designation 2 Hydrae

Henry Draper Catalogue HD71297

SAO Catalogue SAO135916

Hipparcos Catalogue HIP41375

Durchmusterung Catalogue BD-03 2345

General Catalogue of Variable Stars LM Hya

Visibility from Your Location

Today's 2 Hydrae rise, transit and set times from Greenwich, UK are the following (all times relative to the local timezone Europe/London):

Azimuth: 94.1° RISE 12:03

Max altitude: 34.4° TRANSIT 17:41

Azimuth: 265.9° SET 23:18

In Evidence

Other stars in Hydra

2 Hydrae

Celestial Coordinates

Apparent

J2000

Galactic Coordinates

Finder Chart

Magnitude, Color, Spectral Class

Star System Properties

Distance, Radial Speed, Proper Motion

Alternative Designations

Visibility from Your Location

Set Location

In Evidence

Other stars in Hydra

2 Hydrae

Celestial Coordinates

Apparent

J2000

Galactic Coordinates

Finder Chart

Magnitude, Color, Spectral Class

Star System Properties

Distance, Radial Speed, Proper Motion

Alternative Designations

Visibility from Your Location