Rho Cassiopeiae
Also known as rho Cas
Rho Cassiopeiae is a long-period variable star in the constellation Cassiopeia, about 3,440 light-years from Earth.
Yellow hypergiant
Facts
| Type | Long-period variable star (spectral type G2_0) |
|---|---|
| Constellation | Cassiopeia |
| Position (J2000) | 23h 54m 23s, +57° 29′ |
| Distance | 3,440 light-years (its light set off about 3,440 years ago) |
| Brightness | magnitude 4.59 (smaller is brighter; the faintest stars the eye sees are about 6) |
| Studied in | 405 scientific papers (SIMBAD) |
When and how to see it
Rho Cassiopeiae is highest in the sky at midnight in September. From India (about 20° N) it climbs to about 53° above the horizon; from 50° N, to about 83°. To see it you need the naked eye from a dark site.
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