Star profile
1 Cassiopeiae
Hot blue starWhat is 1 Cassiopeiae
1 Cassiopeiae is a blue giant of class B0.5 III, so hot and luminous that astronomers have proposed it as a standard reference for its spectral class. It burns at 27,200 K —nearly five times hotter than the Sun— and pours out eighteen thousand times its light from 1,129 light-years away. The beam reaching us tonight left in the depths of the Middle Ages, before any Gothic cathedral in Europe had yet been built.
Where it is and when to see it
1 Cassiopeiae lies in the northern celestial hemisphere. It is visible to the naked eye under a dark sky. Its best month of the year is October, when it culminates around midnight.
- From London it never sets and culminates about 82° up.
- From New York it never sets and culminates about 71° up.
- From Sydney it never rises above the horizon.
It can be seen from anywhere north of 31° S.
It ranks no. 22 in brightness among the 93 stars of Cassiopeia in our catalogue. To find it, start from Cih, the brightest: it lies about 14° away (a fist at arm's length covers about 10°).
The light you see today left it about 1,100 years ago.
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Astronomical data for 1 Cassiopeiae
- Constellation
- Cassiopeia
- Apparent magnitude
- 4.84
- Distance
- 1128.7 light years
- Coordinates (J2000)
- RA 346.653° · Dec 59.420°
- Catalogue
- HIP 114104 · HD 218376
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Other stars in Cassiopeia
Cassiopeia has 93 stars in Stelvia's catalogue. Here are a few of them.
- CihGamma Cassiopeiae2.15
- SchedarAlpha Cassiopeiae2.24
- CaphBeta Cassiopeiae2.28
- Xi Cassiopeiae4.80
- HIP 41514.80
- Upsilon 1 Cassiopeiae4.83
- HIP 148624.85
- Tau Cassiopeiae4.88