15 Hydrae

Below the horizon. Rise: 12:17 | Tran: 17:38 | Set: 23:00

Alt: -45.39° Az: 349.80° Direction: North

15 Hydrae is a variable and multiple star of spectral class A4 in the constellation of Hydra.

15 Hydrae visual magnitude is 5.54. Because of its faintness, 15 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 15 Hydrae. The red arrow shows the motion of 15 Hydrae during the next 10000 years (-7.33 arcmin in Right Ascension and 0.17 arcmin in declination);

Celestial Coordinates

Apparent

Right Ascension 08h 52m 49s

Declination -07° 16’ 25”

Hour Angle 11h 31m 11s

Sidereal Time 20h 24m 01s

J2000

Right Ascension 08h 51m 34s

Declination -07° 10’ 37”

Galactic Coordinates

Galactic Longitude 234.39°

Galactic Latitude 22.64°

Finder Chart

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Finder chart for 15 Hydrae.

Magnitude, Color, Spectral Class

Color ⬤

Magnitude 5.54

Class

Absolute magnitude -0.34

Spectral Type A4

Color Index (B-V) 0.15

Temperature 8571K

The red dot in the diagram below shows where 15 Hydrae is situated in the Hertzsprung–Russell diagram.

H-R diagram showing the position of 15 Hydrae. Attribution: Richard Powell / CC BY-SA

Star System Properties

15 Hydrae is a visual double star which can be observed with the help of large telescopes. The table below shows key information about the 15 Hydrae double sysyem:

Main star magnitude 5.54

Secondary star magnitude 7.34

Magnitude difference 1.8

Separation 0.9 arcsec

Distance, Radial Speed, Proper Motion

15 Hydrae is distant 488.02 light years from the Sun and it is moving far from the Sun at the speed of 37 kilometers per second.

Distance (parsec) 149.70

Distance (light year) 488.02

Radial Speed 37 km/s

Proper Motion RA -0.044 arcsec/y

Proper Motion Dec 0.001"/y

Alternative Designations

Flamsteed designation 15 Hydrae

Henry Draper Catalogue HD75737

SAO Catalogue SAO136345

Hipparcos Catalogue HIP43496

Durchmusterung Catalogue BD-06 2743

General Catalogue of Variable Stars 4282

Aitken Double Star Catalogue ADS7050

Visibility from Your Location

Today's 15 Hydrae rise, transit and set times from Greenwich, UK are the following (all times relative to the local timezone Europe/London):

Azimuth: 97.3° RISE 12:17

Max altitude: 31.2° TRANSIT 17:38

Azimuth: 262.7° SET 23:00

Set Location

Other stars in Hydra