Your guide to the Solar System and the night sky
🌎 Location: Greenwich, United Kingdom [change]

δ Trianguli (delta Trianguli)

δ Trianguli is a double hypergiant star in the constellation of Triangulum.

δ Trianguli visual magnitude is 4.87. Because of its moderate brightness, δ Trianguli 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 δ Trianguli:

4.87
Hypergiant
δ Trianguli (delta Trianguli) is above the horizon from Greenwich, United Kingdom [change]. Altitude: 19°.

Celestial coordinates and finder chart of δ Trianguli

δ Trianguli is situated north of the celestial equator, as such, it is more easily visible from the northern hemisphere. Celestial coordinates for the J2000 equinox as well as galactic coordinates of δ Trianguli are provided in the following table:

02h 17m 03s
+34° 13’ 27”
142.43°
-25.39°
Triangulum

The simplified sky map below shows the position of δ Trianguli in the sky:

Finder chart δ Trianguli (delta Trianguli) star
Simplified finder chart for δ Trianguli (delta Trianguli).

Visibility of δ Trianguli from your location

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

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

Azimuth: 55.8°
Max altitude: 72.7°
Azimuth: 304.2°
δ Trianguli (delta Trianguli) is above the horizon from Greenwich, United Kingdom

Digitized Sky Survey image of δ Trianguli

The image below is a photograph of δ Trianguli 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 δ Trianguli is 1.154 arcsec per year in Right Ascension and -0.245 arcsec per year in Declination and the associated displacement for the next 100 years is represented with the red arrow.

Image of δ Trianguli (delta Trianguli) star
DSS2 image of δ Trianguli. The red arrow shows the motion of δ Trianguli during the next 100 years (1.92 arcmin in Right Ascension and -0.41 arcmin in declination);

Distance of δ Trianguli from the Sun and relative movement

δ Trianguli is distant 35.36 light years from the Sun and it is moving towards the Sun at the speed of 6 kilometers per second.

10.85 pc
35.36 ly
-6 km/s
1.154 arcsec/year
-0.245 arcsec/year

Spectral properties of δ Trianguli

δ Trianguli belongs to spectral class G0 and has a luminosity class of V corresponding to a hypergiant star.

4.69
G0V
5929K

The red dot in the diagram below shows where δ Trianguli is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of δ Trianguli. Attribution: Richard Powell / CC BY-SA

δ Trianguli star system properties

δ Trianguli 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 δ Trianguli double sysyem:

4.87
13.37
8.5
65.4 arcsec

Alternative designations of δ Trianguli

δ Trianguli
(delta Trianguli)
8 Trianguli
SAO55420
SAO55420