η Hydrae (eta Hydrae)

η Hydrae is a variable main-sequence star in the constellation of Hydra.

η Hydrae visual magnitude is 4.3. Because of its moderate brightness, η 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 η Hydrae:

Color of η Hydrae ⬤

Magnitude of η Hydrae 4.3

Class Main-sequence

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

Celestial coordinates and finder chart of η Hydrae

η 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 η Hydrae are provided in the following table:

Right Ascension J2000 08h 43m 13s

Declination J2000 +03° 23’ 54”

Galactic Longitude 223.25°

Galactic Latitude 26.32°

Constellation Hydra

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

Simplified finder chart for η Hydrae (eta Hydrae).

Visibility of η Hydrae from your location

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

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

Azimuth: 86.6° RISE 14:44

Max altitude: 41.9° TRANSIT 20:59

Azimuth: 273.4° SET 3:18

RIGHT NOW η Hydrae (eta Hydrae) is below the horizon from Greenwich, United Kingdom

Digitized Sky Survey image of η Hydrae

The image below is a photograph of η 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 η Hydrae is -0.019 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.

DSS2 image of η Hydrae. The red arrow shows the motion of η Hydrae during the next 10000 years (-3.17 arcmin in Right Ascension and -0.17 arcmin in declination);

Distance of η Hydrae from the Sun and relative movement

η Hydrae is distant 466.38 light years from the Sun and it is moving far from the Sun at the speed of 17 kilometers per second.

Distance (parsec) 143.06 pc

Distance (light year) 466.38 ly

Heliocentric radial velocity 17 km/s

Proper Motion RA -0.019 arcsec/year

Proper Motion Dec -0.001 arcsec/year

Spectral properties of η Hydrae

η Hydrae belongs to spectral class B3 and has a luminosity class of V corresponding to a main-sequence star.

Absolute magnitude -1.48

Spectral Type B3V

Color Index (B-V) -0.2

Temperature of η Hydrae 13585K

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

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

Alternative designations of η Hydrae

Bayer designation η Hydrae
(eta Hydrae)

Flamsteed designation 7 Hydrae

Henry Draper Catalogue HD74280

SAO Catalogue SAO117050

Hipparcos Catalogue HIP42799

Durchmusterung Catalogue BD+03 2039

FK5 Catalogue 2687

General Catalogue of Variable Stars Eta Hya

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