Star profile
23 Cygni
Hot blue starWhat is 23 Cygni
23 Cygni is a hot blue B-type star 633 light-years away, in the stretch of Cygnus where the Milky Way splits in two along the great dark rift. Hotter and more massive than the Sun, it burns hydrogen at a rate that will drastically shorten its life. The light arriving tonight left around 1390, as Europe was emerging from the Black Death.
Where it is and when to see it
23 Cygni lies in the northern celestial hemisphere. It is visible to the naked eye under a dark sky. Its best month of the year is September, when it culminates around midnight.
- From London it never sets and culminates about 84° up.
- From New York it never sets and culminates about 73° up.
- From Sydney it never rises above the horizon.
It can be seen from anywhere north of 32° S.
It ranks no. 55 in brightness among the 137 stars of Cygnus in our catalogue. To find it, start from Deneb, the brightest: it lies about 14° away (a fist at arm's length covers about 10°).
The light you see today left it about 630 years ago.
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Astronomical data for 23 Cygni
- Constellation
- Cygnus
- Apparent magnitude
- 5.14
- Distance
- 633.4 light years
- Coordinates (J2000)
- RA 298.322° · Dec 57.523°
- Catalogue
- HIP 97870 · HD 188665
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Other stars in Cygnus
Cygnus has 137 stars in Stelvia's catalogue. Here are a few of them.
- DenebAlpha Cygni1.25
- SadrGamma Cygni2.23
- AljanahEpsilon Cygni2.48
- 75 Cygni5.09
- Albireo BBeta 2 Cygni5.12
- 35 Cygni5.14
- 25 Cygni5.15
- 4 Cygni5.17