Your guide to the Solar System and the night sky
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🌎  Observing from: Greenwich, United Kingdom [change]
🌅 Sunrise: 5:59  ☀️ Transit: 12:05  🌅 Sunset: 18:13

Mothallah - α Trianguli (alpha Trianguli)

Mothallah, also designated as α Trianguli (alpha Trianguli), is a multiple sub-giant star in the constellation of Triangulum.

Mothallah visual magnitude is 3.41. Because of its moderate brightness, Mothallah 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 Mothallah:

Mothallah - α Trianguli (alpha Trianguli) is above the horizon from Greenwich, United Kingdom [change]. Altitude: 1°.

Celestial coordinates and finder chart of Mothallah

Mothallah 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 Mothallah are provided in the following table:

01h 53m 04s
+29° 34’ 44”

The simplified sky map below shows the position of Mothallah in the sky:

Finder chart Mothallah - α Trianguli (alpha Trianguli) star
Simplified finder chart for Mothallah - α Trianguli (alpha Trianguli).

Visibility of Mothallah from your location

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

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

Azimuth: 60.4°
Max altitude: 68.1°
Azimuth: 299.6°
Mothallah - α Trianguli (alpha Trianguli) is above the horizon from Greenwich, United Kingdom

Digitized Sky Survey image of Mothallah

The image below is a photograph of Mothallah 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 Mothallah is 0.011 arcsec per year in Right Ascension and -0.235 arcsec per year in Declination and the associated displacement for the next 1000 years is represented with the red arrow.

Image of Mothallah - α Trianguli (alpha Trianguli) star
DSS2 image of Mothallah. The red arrow shows the motion of Mothallah during the next 1000 years (0.18 arcmin in Right Ascension and -3.92 arcmin in declination);

Distance of Mothallah from the Sun and relative movement

Mothallah is distant 64.08 light years from the Sun and it is moving towards the Sun at the speed of 13 kilometers per second.

19.66 pc
64.08 ly
-13 km/s
0.011 arcsec/year
-0.235 arcsec/year

Spectral properties of Mothallah

Mothallah belongs to spectral class F6 and has a luminosity class of IV corresponding to a sub-giant star.


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

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

Mothallah star system properties

Mothallah 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 Mothallah double sysyem:

222.3 arcsec

Alternative designations of Mothallah

α Trianguli
(alpha Trianguli)
2 Trianguli