Caph
Also known as β Cas · HR 21
Caph is a delta Sct variable star in the constellation Cassiopeia, about 54.7 light-years from Earth.
Facts
| Type | Delta Sct variable star (spectral type F2III) |
|---|---|
| Constellation | Cassiopeia |
| Position (J2000) | 0h 09m 10s, +59° 08′ |
| Distance | 54.7 light-years (its light set off about 54.7 years ago) |
| Brightness | magnitude 2.27 (smaller is brighter; the faintest stars the eye sees are about 6) |
| Studied in | 556 scientific papers (SIMBAD) |
When and how to see it
Caph is highest in the sky at midnight in September. From India (about 20° N) it climbs to about 51° above the horizon; from 50° N, to about 81°. 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 Cassiopeia
- Bubble Nebula
- Cassiopeia A
- Heart Nebula
- M52 (NGC 7654)
- M103 (NGC 581)
- Pacman Nebula
- Soul Nebula
- Tycho's Supernova
Everything in Cassiopeia · All 88 constellations · All sky objects
Data: SIMBAD (CDS, Strasbourg; the site's weekly copy) · Data sources & credits