τ9 Eridani (tau9 Eridani)

τ9 Eridani is a variable main-sequence star in the constellation of Eridanus.

τ9 Eridani visual magnitude is 4.66. Because of its moderate brightness, τ9 Eridani 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 τ9 Eridani:

Color of τ9 Eridani ⬤

Magnitude of τ9 Eridani 4.66

Class Main-sequence

VISIBILITY RIGHT NOW τ9 Eridani (tau9 Eridani) is below the horizon from Greenwich, United Kingdom [change].

Celestial coordinates and finder chart of τ9 Eridani

τ9 Eridani 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 τ9 Eridani are provided in the following table:

Right Ascension J2000 03h 59m 55s

Declination J2000 -24° 00’ 59”

Galactic Longitude 219.65°

Galactic Latitude -47.62°

Constellation Eridanus

The simplified sky map below shows the position of τ9 Eridani in the sky:

Finder chart τ9 Eridani (tau9 Eridani) star

Simplified finder chart for τ9 Eridani (tau9 Eridani).

Visibility of τ9 Eridani from your location

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

Today's τ9 Eridani (tau9 Eridani) rise, transit and set times from Greenwich, United Kingdom [change] are the following (all times relative to the local timezone Europe/London):

Azimuth: 114.0° RISE 12:09

Max altitude: 14.5° TRANSIT 15:52

Azimuth: 246.0° SET 19:35

RIGHT NOW τ9 Eridani (tau9 Eridani) is below the horizon from Greenwich, United Kingdom

Digitized Sky Survey image of τ9 Eridani

The image below is a photograph of τ9 Eridani 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 τ9 Eridani is 0.015 arcsec per year in Right Ascension and 0.015 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

DSS2 image of τ9 Eridani. The red arrow shows the motion of τ9 Eridani during the next 10000 years (2.50 arcmin in Right Ascension and 2.50 arcmin in declination);

Distance of τ9 Eridani from the Sun and relative movement

τ9 Eridani is distant 330.96 light years from the Sun and it is moving far from the Sun at the speed of 24 kilometers per second.

Distance (parsec) 101.52 pc

Distance (light year) 330.96 ly

Heliocentric radial velocity 24 km/s

Proper Motion RA 0.015 arcsec/year

Proper Motion Dec 0.015 arcsec/year

Spectral properties of τ9 Eridani

τ9 Eridani belongs to spectral class B6 and has a luminosity class of V corresponding to a main-sequence star.

Absolute magnitude -0.37

Spectral Type B6V

Color Index (B-V) -0.13

Temperature of τ9 Eridani 12103K

The red dot in the diagram below shows where τ9 Eridani is situated in the Hertzsprung–Russell diagram.

H-R diagram showing the position of τ9 Eridani. Attribution: Richard Powell / CC BY-SA

Alternative designations of τ9 Eridani

Bayer designation τ9 Eridani
(tau9 Eridani)

Flamsteed designation 36 Eridani

Henry Draper Catalogue HD25267

SAO Catalogue SAO169017

Hipparcos Catalogue HIP18673

Durchmusterung Catalogue CD-24 2022

FK5 Catalogue 2287

General Catalogue of Variable Stars Tau9 Eri

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Other stars in Eridanus