ο Hydrae (omicron Hydrae)

Altitude: 0.9° Azimuth: 159.3° Direction: South-South-East

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

ο Hydrae visual magnitude is 4.7. Because of its moderate brightness, ο 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 ο Hydrae:

Color of ο Hydrae ⬤

Magnitude of ο Hydrae 4.7

Class Main-sequence

VISIBILITY RIGHT NOW

ο Hydrae (omicron Hydrae) is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 0.9°
Azimuth: 159.3°
Direction: South-South-East

Celestial coordinates and finder chart of ο Hydrae

ο Hydrae is situated south of the celestial equator, as such, it is more easily visible from the southern hemisphere. Celestial coordinates for the J2000 equinox as well as galactic coordinates of ο Hydrae are provided in the following table:

Right Ascension J2000 11h 40m 12s

Declination J2000 -34° 44’ 40”

Galactic Longitude 286.72°

Galactic Latitude 25.87°

Constellation Hydra

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

Finder chart ο Hydrae (omicron Hydrae) star

Simplified finder chart for ο Hydrae (omicron Hydrae).

Visibility of ο 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 ο Hydrae (omicron 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: 124.7° RISE 10:03

Max altitude: 3.8° TRANSIT 12:00

Azimuth: 235.3° SET 13:57

Digitized Sky Survey image of ο Hydrae

The image below is a photograph of ο 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 ο Hydrae is -0.042 arcsec per year in Right Ascension and 0 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

DSS2 image of ο Hydrae. The red arrow shows the motion of ο Hydrae during the next 10000 years (-7.00 arcmin in Right Ascension and 0.00 arcmin in declination);

Distance of ο Hydrae from the Sun and relative movement

ο Hydrae is distant 494.69 light years from the Sun and it is moving far from the Sun at the speed of 6 kilometers per second.

Distance (parsec) 151.75 pc

Distance (light year) 494.69 ly

Heliocentric radial velocity 6 km/s

Proper Motion RA -0.042 arcsec/year

Spectral properties of ο Hydrae

ο Hydrae belongs to spectral class B9 and has a luminosity class of V corresponding to a main-sequence star.

Absolute magnitude -1.21

Spectral Type B9V

Color Index (B-V) -0.07

Temperature of ο Hydrae 11092K

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

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

Alternative designations of ο Hydrae

Bayer designation ο Hydrae
(omicron Hydrae)

Henry Draper Catalogue HD101431

SAO Catalogue SAO202695

Hipparcos Catalogue HIP56922

Durchmusterung Catalogue CD-34 7610

FK5 Catalogue 439

Support us

In Evidence

Other stars in Hydra