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public Observing fromLocation: Greenwich, United Kingdom edit_location_alt
north SunriseRise: 6:47  
clear_day Transit: 12:50  
SunsetSet: 18:52 south
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All Constellations » Taurus » 

Secunda Hyadum - δ1 Tauri (delta1 Tauri)

Altitude: 10.4°   Azimuth: 74.8°   Direction: East-North-East

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:


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

Altitude: 10.4°
Azimuth: 74.8°
Direction: East-North-East

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:

04h 22m 56s
+17° 32’ 33”

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 edit_location_alt
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 edit_location_alt are the following (all times relative to the local timezone Europe/London):

Azimuth: 72.5°
Max altitude: 56.1°
Azimuth: 287.5°

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.

46.97 pc
153.12 ly
39 km/s
0.107 arcsec/year
-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.


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

HR 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:

109.6 arcsec

Alternative designations of Secunda Hyadum

Secunda Hyadum
δ1 Tauri
(delta1 Tauri)