Your guide to the Solar System and the night sky
Please donate now to help keep TheSkyLive ads-free. This site cannot run without your voluntary donations.
🌎  Greenwich, United Kingdom [change]

τ2 Hydri (tau2 Hydri)

τ2 Hydri is a double hypergiant star in the constellation of Hydrus.

τ2 Hydri visual magnitude is 6.06. Because of its reltive faintness, τ2 Hydri should be visible only from locations with dark skyes, while it is not visible at all from skyes affected by light pollution.

The table below summarizes the key facts about τ2 Hydri:

6.06
Hypergiant
τ2 Hydri (tau2 Hydri) is below the horizon from Greenwich, United Kingdom [change].

Celestial coordinates and finder chart of τ2 Hydri

τ2 Hydri is situated close to the southern celestial pole and, as such, it is easilty visible for most part of the year from the southern hemisphere. Celestial coordinates for the J2000 equinox as well as galactic coordinates of τ2 Hydri are provided in the following table:

01h 47m 46s
-80° 10’ 36”
299.96°
-36.63°
Hydrus

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

Finder chart τ2 Hydri (tau2 Hydri) star
Simplified finder chart for τ2 Hydri (tau2 Hydri).

Visibility of τ2 Hydri from your location

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

τ2 Hydri (tau2 Hydri) is currently not visible from Greenwich, United Kingdom [change]

Digitized Sky Survey image of τ2 Hydri

The image below is a photograph of τ2 Hydri 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 Hydri is -0.074 arcsec per year in Right Ascension and -0.071 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of τ2 Hydri (tau2 Hydri) star
DSS2 image of τ2 Hydri. The red arrow shows the motion of τ2 Hydri during the next 10000 years (-12.33 arcmin in Right Ascension and -11.83 arcmin in declination);

Distance of τ2 Hydri from the Sun and relative movement

τ2 Hydri is distant 202.11 light years from the Sun and it is moving far from the Sun at the speed of 30 kilometers per second.

62.00 pc
202.11 ly
30 km/s
-0.074 arcsec/year
-0.071 arcsec/year

Spectral properties of τ2 Hydri

τ2 Hydri belongs to spectral class F0 and has a luminosity class of IV corresponding to a hypergiant star.

2.10
F0IV
7217K

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

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

τ2 Hydri star system properties

τ2 Hydri 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 τ2 Hydri double sysyem:

6.06
13.46
7.4
39.7 arcsec

Alternative designations of τ2 Hydri

τ2 Hydri
(tau2 Hydri)
SAO258280
SAO258280