θ1 Tauri (theta1 Tauri)

θ1 Tauri is a multiple hypergiant star in the constellation of Taurus.

θ1 Tauri visual magnitude is 3.84. Because of its moderate brightness, θ1 Tauri 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 θ1 Tauri:

Color of θ1 Tauri ⬤

Magnitude of θ1 Tauri 3.84

Class Hypergiant

VISIBILITY RIGHT NOW θ1 Tauri (theta1 Tauri) is above the horizon from Greenwich, United Kingdom [change]. Altitude: 8°.

Celestial coordinates and finder chart of θ1 Tauri

θ1 Tauri 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 θ1 Tauri are provided in the following table:

Right Ascension J2000 04h 28m 34s

Declination J2000 +15° 57’ 43”

Galactic Longitude 180.26°

Galactic Latitude -21.97°

Constellation Taurus

The simplified sky map below shows the position of θ1 Tauri in the sky:

Finder chart θ1 Tauri (theta1 Tauri) star

Simplified finder chart for θ1 Tauri (theta1 Tauri).

Visibility of θ1 Tauri from your location

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

Today's θ1 Tauri (theta1 Tauri) rise, transit and set times from Greenwich, United Kingdom [change] are the following (all times relative to the local timezone Europe/London):

Azimuth: 74.0° RISE 9:47

Max altitude: 54.5° TRANSIT 17:09

Azimuth: 286.0° SET 0:31

RIGHT NOW θ1 Tauri (theta1 Tauri) is above the horizon from Greenwich, United Kingdom

Digitized Sky Survey image of θ1 Tauri

The image below is a photograph of θ1 Tauri 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 θ1 Tauri is 0.103 arcsec per year in Right Ascension and -0.027 arcsec per year in Declination and the associated displacement for the next 1000 years is represented with the red arrow.

DSS2 image of θ1 Tauri. The red arrow shows the motion of θ1 Tauri during the next 1000 years (1.72 arcmin in Right Ascension and -0.45 arcmin in declination);

Distance of θ1 Tauri from the Sun and relative movement

θ1 Tauri is distant 157.79 light years from the Sun and it is moving far from the Sun at the speed of 40 kilometers per second.

Distance (parsec) 48.40 pc

Distance (light year) 157.79 ly

Heliocentric radial velocity 40 km/s

Proper Motion RA 0.103 arcsec/year

Proper Motion Dec -0.027 arcsec/year

Spectral properties of θ1 Tauri

θ1 Tauri belongs to spectral class K0 and has a luminosity class of III corresponding to a hypergiant star.

Absolute magnitude 0.42

Spectral Type K0III

Color Index (B-V) 0.95

Temperature of θ1 Tauri 4866K

The red dot in the diagram below shows where θ1 Tauri is situated in the Hertzsprung–Russell diagram.

H-R diagram showing the position of θ1 Tauri. Attribution: Richard Powell / CC BY-SA

θ1 Tauri star system properties

θ1 Tauri is a visual double star which can be observed with binoculars or small telescopes. The table below shows key information about the θ1 Tauri double sysyem:

Main star magnitude 3.84

Secondary star magnitude 4.24

Magnitude difference 0.4

Separation 337.4 arcsec

Alternative designations of θ1 Tauri

Bayer designation θ1 Tauri
(theta1 Tauri)

Flamsteed designation 77 Tauri

Henry Draper Catalogue HD28307

SAO Catalogue SAO93955

Hipparcos Catalogue HIP20885

Durchmusterung Catalogue BD+15 631

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