Errai
Also known as γ Cep · HR 8974
Errai is a spectroscopic binary star in the constellation Cepheus, about 45 light-years from Earth.
Facts
| Type | Spectroscopic binary star (spectral type K1III-IVCN1) |
|---|---|
| Constellation | Cepheus |
| Position (J2000) | 23h 39m 20s, +77° 37′ |
| Distance | 45 light-years (its light set off about 45 years ago) |
| Brightness | magnitude 3.21 (smaller is brighter; the faintest stars the eye sees are about 6) |
| Studied in | 640 scientific papers (SIMBAD) |
When and how to see it
Errai is highest in the sky at midnight in September. From India (about 20° N) it climbs to about 32° above the horizon; from 50° N, to about 62°. 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 Cepheus
- Bow-Tie Nebula
- Cave Nebula
- Elephant's Trunk Nebula
- Garnet Star
- Iris Nebula
- RW Cephei
- VV Cephei
- Wizard Nebula
Everything in Cepheus · All 88 constellations · All sky objects
Data: SIMBAD (CDS, Strasbourg; the site's weekly copy) · Data sources & credits