δ Hydrae (delta Hydrae)

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 skyes, while it can be barely visible, or not visible at all, from skyes affected by light pollution.

The table below summarizes the key facts about δ Hydrae:

Color of δ Hydrae ⬤

Magnitude of δ Hydrae 4.16

Class Main-sequence

VISIBILITY RIGHT NOW δ Hydrae (delta Hydrae) is below the horizon from Greenwich, United Kingdom [change].

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:

Right Ascension J2000 08h 37m 39s

Declination J2000 +05° 42’ 12”

Galactic Longitude 220.26°

Galactic Latitude 26.18°

Constellation 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 [change]
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 [change] are the following (all times relative to the local timezone Europe/London):

Azimuth: 84.3° RISE 14:14

Max altitude: 44.2° TRANSIT 20:41

Azimuth: 275.7° SET 3:11

RIGHT NOW δ Hydrae (delta Hydrae) is below the horizon from Greenwich, United Kingdom

Digitized Sky Survey image of δ Hydrae

The image below is a photograph of δ 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 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.

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);

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.

Distance (parsec) 54.91 pc

Distance (light year) 179.02 ly

Heliocentric radial velocity 11 km/s

Proper Motion RA -0.066 arcsec/year

Proper Motion Dec -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.

Absolute magnitude 0.46

Spectral Type A1V

Color Index (B-V) 0

Temperature of δ Hydrae 10125K

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

Main star magnitude 4.16

Secondary star magnitude 10.36

Magnitude difference 6.2

Separation 243.7 arcsec

Alternative designations of δ Hydrae

Bayer designation δ Hydrae
(delta Hydrae)

Flamsteed designation 4 Hydrae

Henry Draper Catalogue HD73262

SAO Catalogue SAO116965

Hipparcos Catalogue HIP42313

Durchmusterung Catalogue BD+06 2001

FK5 Catalogue 1223

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