Star profile
55 Pegasi
Cool red starWhat is 55 Pegasi
55 Pegasi is an aged red giant on the asymptotic branch, swollen to forty-six times the Sun's radius. It glows with a muted reddish hue 329 light-years off, radiating nearly five hundred times the solar light despite a surface barely above 4,000 K. The light arriving tonight set out when Spain was still entering democracy, and it burns with the terminal calm of a star that has spent all its hydrogen.
Where it is and when to see it
55 Pegasi 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 culminates about 48° above the horizon.
- From New York it culminates about 59° above the horizon.
- From Sydney it culminates about 47° above the horizon.
It can be seen from anywhere north of 81° S.
It ranks no. 18 in brightness among the 98 stars of Pegasus in our catalogue. To find it, start from Enif, the brightest: it lies about 20° away (a fist at arm's length covers about 10°).
The light you see today left it about 330 years ago.
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Astronomical data for 55 Pegasi
- Constellation
- Pegasus
- Apparent magnitude
- 4.54
- Distance
- 328.8 light years
- Coordinates (J2000)
- RA 346.751° · Dec 9.409°
- Catalogue
- HIP 114144 · HD 218329
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Other stars in Pegasus
Pegasus has 98 stars in Stelvia's catalogue. Here are a few of them.
- EnifEpsilon Pegasi2.38
- ScheatBeta Pegasi2.44
- MarkabAlpha Pegasi2.49
- 9 Pegasi4.34
- AlkarabUpsilon Pegasi4.42
- 2 Pegasi4.52
- 70 Pegasi4.54
- SalmTau Pegasi4.58