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Secunda Hyadum - δ1 Tauri (delta1 Tauri)

Secunda Hyadum, also designated as δ1 Tauri (delta1 Tauri), is a variable and multiple hypergiant star in the constellation of Taurus.

Secunda Hyadum visual magnitude is 3.76. Because of its moderate brightness, Secunda Hyadum 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 Secunda Hyadum:

Color of Secunda Hyadum ⬤

Magnitude of Secunda Hyadum 3.76

Class Hypergiant

VISIBILITY RIGHT NOW Secunda Hyadum - δ1 Tauri (delta1 Tauri) is above the horizon from Greenwich, United Kingdom [change]. Altitude: 41°.

Celestial coordinates and finder chart of Secunda Hyadum

Secunda Hyadum 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 Secunda Hyadum are provided in the following table:

Right Ascension J2000 04h 22m 56s

Declination J2000 +17° 32’ 33”

Galactic Longitude 178.01°

Galactic Latitude -22.01°

Constellation Taurus

The simplified sky map below shows the position of Secunda Hyadum in the sky:

Finder chart Secunda Hyadum - δ1 Tauri (delta1 Tauri) star

Simplified finder chart for Secunda Hyadum - δ1 Tauri (delta1 Tauri).

Visibility of Secunda Hyadum from your location

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

Today's Secunda Hyadum - δ1 Tauri (delta1 Tauri) rise, transit and set times from Greenwich, United Kingdom [change] are the following (all times relative to the local timezone Europe/London):

Azimuth: 72.5° RISE 9:28

Max altitude: 56.1° TRANSIT 16:59

Azimuth: 287.5° SET 0:30

RIGHT NOW Secunda Hyadum - δ1 Tauri (delta1 Tauri) is above the horizon from Greenwich, United Kingdom

Digitized Sky Survey image of Secunda Hyadum

The image below is a photograph of Secunda Hyadum 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 Secunda Hyadum is 0.107 arcsec per year in Right Ascension and -0.03 arcsec per year in Declination and the associated displacement for the next 1000 years is represented with the red arrow.

Image of Secunda Hyadum - δ1 Tauri (delta1 Tauri) star

DSS2 image of Secunda Hyadum. The red arrow shows the motion of Secunda Hyadum during the next 1000 years (1.78 arcmin in Right Ascension and -0.50 arcmin in declination);

Distance of Secunda Hyadum from the Sun and relative movement

Secunda Hyadum is distant 153.12 light years from the Sun and it is moving far from the Sun at the speed of 39 kilometers per second.

Distance (parsec) 46.97 pc

Distance (light year) 153.12 ly

Heliocentric radial velocity 39 km/s

Proper Motion RA 0.107 arcsec/year

Proper Motion Dec -0.03 arcsec/year

Spectral properties of Secunda Hyadum

Secunda Hyadum belongs to spectral class K0 and has a luminosity class of III corresponding to a hypergiant star.

Absolute magnitude 0.40

Spectral Type K0III

Color Index (B-V) 0.98

Temperature of Secunda Hyadum 4791K

The red dot in the diagram below shows where Secunda Hyadum is situated in the Hertzsprung–Russell diagram.

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

Secunda Hyadum star system properties

Secunda Hyadum 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 Secunda Hyadum double sysyem:

Main star magnitude 3.76

Secondary star magnitude 12.46

Magnitude difference 8.7

Separation 109.6 arcsec

Alternative designations of Secunda Hyadum

Proper Name Secunda Hyadum

Bayer designation δ1 Tauri
(delta1 Tauri)

Flamsteed designation 61 Tauri

Henry Draper Catalogue HD27697

SAO Catalogue SAO93897

Hipparcos Catalogue HIP20455

Durchmusterung Catalogue BD+17 712

FK5 Catalogue 162

General Catalogue of Variable Stars 1582

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