12 Hydrae

12 Hydrae is a double giant star in the constellation of Hydra.

12 Hydrae visual magnitude is 4.32. Because of its moderate brightness, 12 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 12 Hydrae:

Color of 12 Hydrae ⬤

Magnitude of 12 Hydrae 4.32

Class Giant

VISIBILITY RIGHT NOW 12 Hydrae is above the horizon from Greenwich, United Kingdom edit_location_alt. Altitude: 3°.

Celestial coordinates and finder chart of 12 Hydrae

12 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 12 Hydrae are provided in the following table:

Right Ascension J2000 08h 46m 22s

Declination J2000 -13° 32’ 52”

Galactic Longitude 239.25°

Galactic Latitude 18.01°

Constellation Hydra

The simplified sky map below shows the position of 12 Hydrae in the sky:

Simplified finder chart for 12 Hydrae.

Visibility of 12 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 12 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: 103.5° RISE 12:22

Max altitude: 25.0° TRANSIT 17:10

Azimuth: 256.5° SET 21:58

RIGHT NOW 12 Hydrae is above the horizon from Greenwich, United Kingdom

Digitized Sky Survey image of 12 Hydrae

The image below is a photograph of 12 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 12 Hydrae is 0.016 arcsec per year in Right Ascension and -0.011 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

DSS2 image of 12 Hydrae. The red arrow shows the motion of 12 Hydrae during the next 10000 years (2.67 arcmin in Right Ascension and -1.83 arcmin in declination);

Distance of 12 Hydrae from the Sun and relative movement

12 Hydrae is distant 226.70 light years from the Sun and it is moving towards the Sun at the speed of 8 kilometers per second.

Distance (parsec) 69.54 pc

Distance (light year) 226.70 ly

Heliocentric radial velocity -8 km/s

Proper Motion RA 0.016 arcsec/year

Proper Motion Dec -0.011 arcsec/year

Spectral properties of 12 Hydrae

12 Hydrae belongs to spectral class G8 and has a luminosity class of III corresponding to a giant star.

Absolute magnitude 0.11

Spectral Type G8III

Color Index (B-V) 0.9

Temperature of 12 Hydrae 4996K

The red dot in the diagram below shows where 12 Hydrae is situated in the Hertzsprung–Russell diagram.

H-R diagram showing the position of 12 Hydrae. Attribution: Richard Powell / CC BY-SA

12 Hydrae star system properties

12 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 12 Hydrae double sysyem:

Main star magnitude 4.32

Secondary star magnitude 13.62

Magnitude difference 9.3

Separation 19.9 arcsec

Alternative designations of 12 Hydrae

Flamsteed designation 12 Hydrae

Henry Draper Catalogue HD74918

SAO Catalogue SAO154622

Hipparcos Catalogue HIP43067

Durchmusterung Catalogue BD-13 2673

In Evidence

Other stars in Hydra