τ2 Hydrae (tau2 Hydrae)

τ2 Hydrae is a main-sequence star in the constellation of Hydra.

τ2 Hydrae visual magnitude is 4.57. Because of its moderate brightness, τ2 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 τ2 Hydrae:

Color of τ2 Hydrae ⬤

Magnitude of τ2 Hydrae 4.57

Class Main-sequence

VISIBILITY RIGHT NOW τ2 Hydrae (tau2 Hydrae) is below the horizon from Greenwich, United Kingdom edit_location_alt.

Celestial coordinates and finder chart of τ2 Hydrae

τ2 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 τ2 Hydrae are provided in the following table:

Right Ascension J2000 09h 31m 58s

Declination J2000 -01° 11’ 06”

Galactic Longitude 235.15°

Galactic Latitude 34.34°

Constellation Hydra

The simplified sky map below shows the position of τ2 Hydrae in the sky:

Finder chart τ2 Hydrae (tau2 Hydrae) star

Simplified finder chart for τ2 Hydrae (tau2 Hydrae).

Visibility of τ2 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 τ2 Hydrae (tau2 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: 91.2° RISE 11:56

Max altitude: 37.3° TRANSIT 17:48

Azimuth: 268.8° SET 23:40

RIGHT NOW τ2 Hydrae (tau2 Hydrae) is below the horizon from Greenwich, United Kingdom

Digitized Sky Survey image of τ2 Hydrae

The image below is a photograph of τ2 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 τ2 Hydrae is -0.012 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 τ2 Hydrae. The red arrow shows the motion of τ2 Hydrae during the next 10000 years (-2.00 arcmin in Right Ascension and -1.83 arcmin in declination);

Distance of τ2 Hydrae from the Sun and relative movement

τ2 Hydrae is distant 458.51 light years from the Sun and it is moving far from the Sun at the speed of 6 kilometers per second.

Distance (parsec) 140.65 pc

Distance (light year) 458.51 ly

Heliocentric radial velocity 6 km/s

Proper Motion RA -0.012 arcsec/year

Proper Motion Dec -0.011 arcsec/year

Spectral properties of τ2 Hydrae

τ2 Hydrae belongs to spectral class A3 and has a luminosity class of V corresponding to a main-sequence star.

Absolute magnitude -1.17

Spectral Type A3V

Color Index (B-V) 0.1

Temperature of τ2 Hydrae 9028K

The red dot in the diagram below shows where τ2 Hydrae is situated in the Hertzsprung–Russell diagram.

H-R diagram showing the position of τ2 Hydrae. Attribution: Richard Powell / CC BY-SA

Alternative designations of τ2 Hydrae

Bayer designation τ2 Hydrae
(tau2 Hydrae)

Flamsteed designation 32 Hydrae

Henry Draper Catalogue HD82446

SAO Catalogue SAO136932

Hipparcos Catalogue HIP46776

Durchmusterung Catalogue BD-00 2211

In Evidence

Other stars in Hydra