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Cassiopeia (abbr. Cas, gen. Cassiopeiae)
The Queen, mother of Andromeda; a large northern constellation with a distinctive "W" shape and with the Milky Way as a backdrop. A binocular sweep of the region is rewarding (especially around Delta Cas) and small instruments reveal an interesting assortment of nebulae and open clusters. See below for details of the constellation's brightest stars and interesting deep sky objects.
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| Cassiopeia. © 2003 Torsten Bronger. Copied here under the terms of the GNU Free Documentation License |
| Stars brighter than magnitude 4.0 | ||||||
|---|---|---|---|---|---|---|
| Star | Visual mag. |
Abs. mag. |
Spectral type |
Distance (lt-yr) |
R.A. (h m s) | Dec. ( ° ' '' ) |
| Alpha (Shedar) | 2.24 | -1.99 | K0IIa | 229 | 00 40 30 | +56 32 15 |
| Gamma Cassopeiae | 2.15v | -4.22 | B0IVe | 613 | 00 56 43 | +60 43 00 |
| Beta (Caph) | 2.28 | 1.16 | F2III-IV | 54 | 00 09 11 | +59 08 59 |
| Delta (Ruchbach) | 2.66 | 0.24 | A5III-IVv | 99 | 01 25 49 | +60 14 07 |
| Epsilon (Segin) | 3.35 | -2.31 | B3III | 442 | 01 54 24 | +63 40 13 |
| Eta (Achird) | 3.46 | -4.73 | G0V+dM0 | 1,410 | 00 49 06 | +57 48 58 |
| Zeta | 3.69 | -2.63 | B2IV | 597 | 00 36 58 | +53 53 49 |
| Other objects of interest | ||
|---|---|---|
| Name | Type of Object | Notes |
| Bubble Nebula | planetary nebula | NGC 7635. See separate entry |
| Cassiopeia A | supernova remnant | See separate entry |
| IC 59 | diffuse nebula | Nebulosity associated with Gamma Cas, consisting of two fans pointing northwest. Magnitude 9.9; diameter 10'; R.A. 0h 57.5m, Dec. +61° 09' |
| NGC 281 | diffuse nebula | One degree west of Shedar. Magnitude 7; diameter 35'; R.A. 0h 52.8m, Dec. +56° 37' |
| M52 (NGC 7654) | open cluster | Kidney-shaped, containing over 100 stars, with a prominent magnitude 8 star at one edge. A good object for binoculars. Magnitude 6.9; diameter 13'; R.A. 23h 24.2m, Dec. +61° 35' |
| M103 (NGC 581) | open cluster | A fan-shaped cluster with at least 40 stars. Magnitude 7.4, diameter 6'; R.A. 01h 33.2m, Dec. +60° 42' |
| NGC 457 | open cluster | One of the brightest open clusters in the sky and an attractive object for small telescopes. Its stars appear to be arranged in chains. Magnitude 6.4; diameter 13'; R.A. 01h 19.1m, Dec. +58° 20' |
| Cassiopeia Dwarf | galaxy | See separate entry |
| Constellations |
| Andromeda | Antlia | Apus | Aquarius | Aquila | Ara | Aries | Auriga | Bootes | Caelum | Camelopardalis | Cancer | Canes Venatici | Canis Major | Canis Minor | Capricornus | Carina | Cassiopeia | Centaurus | Cepheus | Cetus | Chamaeleon | Circinus | Columba | Coma Berenices | Corona Austrina | Corona Borealis | Corvus | Crater | Crux | Cygnus | Delphinus | Dorado | Draco | Equuleus | Eridanus | Fornax | Gemini | Grus | Hercules | Horologium | Hydra | Hydrus | Indus | Lacerta | Leo | Leo Minor | Lepus | Libra | Lupus | Lynx | Lyra | Mensa | Microscopium | Monoceros | Musca | Norma | Octans | Ophiuchus | Orion | Pavo | Pegasus | Perseus | Phoenix | Pictor | Pisces | Piscis Austrinus | Puppis | Pyxis | Reticulum | Sagitta | Sagittarius | Scorpius | Sculptor | Scutum | Serpens | Sextans | Taurus | Telescopium | Triangulum | Triangulum Australe | Tucana | Ursa Major | Ursa Minor | Vela | Virgo | Volans | Vulpecula |
Related categories
• NOTABLE STARS
• NEBULAE AND STAR CLUSTERS
• GALAXIES
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