Mothallah
Also known as α Tri · HR 544
Mothallah is a spectroscopic binary star in the constellation Triangulum, about 64 light-years from Earth.
Facts
| Type | Spectroscopic binary star (spectral type F5III) |
|---|---|
| Constellation | Triangulum |
| Position (J2000) | 1h 53m 04s, +29° 34′ |
| Distance | 64 light-years (its light set off about 64 years ago) |
| Brightness | magnitude 3.42 (smaller is brighter; the faintest stars the eye sees are about 6) |
| Studied in | 301 scientific papers (SIMBAD) |
When and how to see it
Mothallah is highest in the sky at midnight in October. From India (about 20° N) it climbs to about 80° above the horizon; from 50° N, to about 70°. To see it you need the naked eye, even from a town.
Heights are worked out for India and for 50° N. Set your location in Settings to see them for where you are.
For tonight's best time from your own town, the darkness and the Moon, open it on the map and see its "Tonight from your location" card.
More in Triangulum
Everything in Triangulum · All 88 constellations · All sky objects
Data: SIMBAD (CDS, Strasbourg; the site's weekly copy) · Data sources & credits