Star profile
22 Scorpii
Hot blue starWhat is 22 Scorpii
22 Scorpii is a blue sun barely ten million years old, set in the body of the Scorpion, with four and a half solar masses and roughly 600 times the Sun's luminosity. It spins at 169 km per second at its equator —fast enough to flatten its shape— and burns in the deep blue typical of type B3. At 413 light-years, its magnitude-4.79 glow trails the Scorpion's tail through northern summer nights.
Where it is and when to see it
22 Scorpii lies in the southern celestial hemisphere. It is visible to the naked eye under a dark sky. Its best month of the year is May, when it culminates around midnight.
- From London it culminates about 13° above the horizon.
- From New York it culminates about 24° above the horizon.
- From Sydney it culminates about 81° above the horizon.
It can be seen from anywhere south of 65° N.
It ranks no. 31 in brightness among the 104 stars of Scorpius in our catalogue. To find it, start from Antares, the brightest: it lies about 1° away (a fist at arm's length covers about 10°).
The light you see today left it about 410 years ago.
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Astronomical data for 22 Scorpii
- Constellation
- Scorpius
- Apparent magnitude
- 4.79
- Distance
- 413.4 light years
- Coordinates (J2000)
- RA 247.552° · Dec -25.115°
- Catalogue
- HIP 80815 · HD 148605
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Other stars in Scorpius
Scorpius has 104 stars in Stelvia's catalogue. Here are a few of them.
- AntaresAlpha Scorpii1.06
- ShaulaLambda Scorpii1.62
- SargasTheta Scorpii1.86
- 1 Scorpii4.63
- Zeta 1 Scorpii4.70
- Iota 2 Scorpii4.78
- HIP 872204.79
- HIP 798814.80