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A Complete Guide to the Solar System and the Night Sky
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public Observing fromLocation: Greenwich, United Kingdom edit_location_alt
SunriseRise: 6:44  
clear_day Transit: 12:10  
SunsetSet: 17:38
sunny DaytimeWhat's Visible Now?
All Constellations » Hydra » 

δ Hydrae (delta Hydrae)

Altitude: -24.1°   Azimuth: 42.5°   Direction: North-East

δ Hydrae is a double main-sequence star in the constellation of Hydra.

δ Hydrae visual magnitude is 4.16. Because of its moderate brightness, δ Hydrae should be easily visible from locations with dark skies, while it can be barely visible, or not visible at all, from skies affected by light pollution.

The proper motion of δ Hydrae is -0.066 arcsec per year in Right Ascension and -0.007 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of δ Hydrae (delta Hydrae) star
DSS2 image of δ Hydrae. The red arrow shows the motion of δ Hydrae during the next 10000 years (-11.00 arcmin in Right Ascension and -1.17 arcmin in declination);

Key facts about δ Hydrae

4.16
Main-sequence

δ Hydrae (delta Hydrae) is below the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: -24.1°
Azimuth: 42.5°
Direction: North-East

Celestial coordinates and finder chart of δ Hydrae

δ 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 δ Hydrae are provided in the following table:

08h 37m 39s
+05° 42’ 12”
220.26°
26.18°
Hydra

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

Finder chart δ Hydrae (delta Hydrae) star
Simplified finder chart for δ Hydrae (delta Hydrae).

Visibility of δ 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 δ Hydrae (delta 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: 84.3°
Max altitude: 44.2°
Azimuth: 275.7°

Distance of δ Hydrae from the Sun and relative movement

δ Hydrae is distant 179.02 light years from the Sun and it is moving far from the Sun at the speed of 11 kilometers per second.

54.91 pc
179.02 ly
11 km/s
-0.066 arcsec/year
-0.007 arcsec/year

Spectral properties of δ Hydrae

δ Hydrae belongs to spectral class A1 and has a luminosity class of V corresponding to a main-sequence star.

0.46
A1V
10125K

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

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

δ Hydrae star system properties

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

4.16
10.36
6.2
243.7 arcsec

Alternative designations of δ Hydrae

δ Hydrae
(delta Hydrae)
SAO116965
SAO116965