τ7 Eridani (tau7 Eridani)

Altitude: -43.5° Azimuth: 72.8° Direction: East-North-East

τ7 Eridani is a variable star in the constellation of Eridanus.

τ7 Eridani visual magnitude is 5.24. Because of its reltive faintness, τ7 Eridani 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 τ7 Eridani:

Color of τ7 Eridani ⬤

Magnitude of τ7 Eridani 5.24

Class

VISIBILITY RIGHT NOW

τ7 Eridani (tau7 Eridani) is below the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: -43.5°
Azimuth: 72.8°
Direction: East-North-East

Celestial coordinates and finder chart of τ7 Eridani

τ7 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 τ7 Eridani are provided in the following table:

Right Ascension J2000 03h 47m 39s

Declination J2000 -23° 52’ 28”

Galactic Longitude 218.37°

Galactic Latitude -50.3°

Constellation Eridanus

The simplified sky map below shows the position of τ7 Eridani in the sky:

Finder chart τ7 Eridani (tau7 Eridani) star

Simplified finder chart for τ7 Eridani (tau7 Eridani).

Visibility of τ7 Eridani 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 τ7 Eridani (tau7 Eridani) 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: 113.9° RISE 19:13

Max altitude: 14.6° TRANSIT 22:57

Azimuth: 246.1° SET 2:45

Digitized Sky Survey image of τ7 Eridani

The image below is a photograph of τ7 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 τ7 Eridani is 0.043 arcsec per year in Right Ascension and 0.048 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

DSS2 image of τ7 Eridani. The red arrow shows the motion of τ7 Eridani during the next 10000 years (7.17 arcmin in Right Ascension and 8.00 arcmin in declination);

Distance of τ7 Eridani from the Sun and relative movement

τ7 Eridani is distant 272.12 light years from the Sun and it is moving far from the Sun at the speed of 29 kilometers per second.

Distance (parsec) 83.47 pc

Distance (light year) 272.12 ly

Heliocentric radial velocity 29 km/s

Proper Motion RA 0.043 arcsec/year

Proper Motion Dec 0.048 arcsec/year

Spectral properties of τ7 Eridani

τ7 Eridani belongs to spectral class A2

Absolute magnitude 0.63

Spectral Type A2

Color Index (B-V) 0.07

Temperature of τ7 Eridani 9328K

The red dot in the diagram below shows where τ7 Eridani is situated in the Hertzsprung–Russell diagram.

H-R diagram showing the position of τ7 Eridani. Attribution: Richard Powell / CC BY-SA

Alternative designations of τ7 Eridani

Bayer designation τ7 Eridani
(tau7 Eridani)

Flamsteed designation 28 Eridani

Henry Draper Catalogue HD23878

SAO Catalogue SAO168836

Hipparcos Catalogue HIP17717

Durchmusterung Catalogue CD-24 1877

General Catalogue of Variable Stars Var

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In Evidence

Other stars in Eridanus