Your Guide to the Solar System and the Night Sky
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public Observing fromLocation: Greenwich, United Kingdom edit_location_alt
north SunriseRise: 6:54  
clear_day Transit: 12:49  
SunsetSet: 18:43 south
sunny DaytimeWhat's Visible Now
All Constellations » Hydra » 

15 Hydrae

Altitude: 2.7°   Azimuth: 255.0°   Direction: West-South-West

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

15 Hydrae visual magnitude is 5.54. Because of its reltive faintness, 15 Hydrae should be visible only from locations with dark skyes, while it is not visible at all from skyes affected by light pollution.

The table below summarizes the key facts about 15 Hydrae:


15 Hydrae is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 2.7°
Azimuth: 255.0°
Direction: West-South-West

Celestial coordinates and finder chart of 15 Hydrae

15 Hydrae is situated close to the celestial equator, as such, it is at least partly visible from both hemispheres in certain times of the year. Celestial coordinates for the J2000 equinox as well as galactic coordinates of 15 Hydrae are provided in the following table:

08h 51m 34s
-07° 10’ 37”

The simplified sky map below shows the position of 15 Hydrae in the sky:

Finder chart 15 Hydrae star
Simplified finder chart for 15 Hydrae.

Visibility of 15 Hydrae from your location

Location: Greenwich, United Kingdom edit_location_alt
Latitude: 51° 28’ 47” N
Longitude: 0° 00’ 00” E
Timezone: Europe/London

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

Azimuth: 97.2°
Max altitude: 31.3°
Azimuth: 262.8°

Digitized Sky Survey image of 15 Hydrae

The image below is a photograph of 15 Hydrae from the Digitized Sky Survey 2 (DSS2 - see the credits section) taken in the red channel. The area of sky represented in the image is 0.5x0.5 degrees (30x30 arcmins). The proper motion of 15 Hydrae is -0.044 arcsec per year in Right Ascension and 0.001 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of 15 Hydrae star
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);

Distance of 15 Hydrae from the Sun and relative movement

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.

149.70 pc
488.02 ly
37 km/s
-0.044 arcsec/year
0.001 arcsec/year

Spectral properties of 15 Hydrae

15 Hydrae belongs to spectral class A4


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

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

15 Hydrae 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:

0.9 arcsec

Alternative designations of 15 Hydrae