Rho Pegasi
A probable astrometric binary with a white A-type primary.
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Rho Pegasi, also named Leidian, is a probable astrometric binary system in the northern constellation of Pegasus, near the boundary with Pisces. The visible component is a white-hued A-type main-sequence star faintly visible to the naked eye at an apparent visual magnitude of 4.90.
Quick Facts
- Apparent visual magnitude
- 4.90
- Distance
- approximately 274 light years
- Radial velocity
- −10.6 km/s
- Stellar classification
- A1V
- Effective temperature
- 9,484 K
- Projected rotational velocity
- 107 km/s
Facts from the source article.
Background
Rho Pegasi was identified as a probable astrometric binary through changes in the proper motion of its visible component. The system is drifting closer to the Sun, with a radial velocity of −10.6 km/s.
The visible star is an A1V main-sequence star, 331 million years old, spinning at a projected rotational velocity of 107 km/s. It has 2.8 times the Sun's mass, 3.1 times its radius, and radiates 110 times the Sun's luminosity from a photosphere at 9,484 K. In Chinese astronomy, the star belongs to the constellation Léi Diàn (Thunder and Lightning). The IAU Working Group on Star Names adopted the name Leidian for this star on 13 August 2026, after this Chinese constellation.
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Sources
Compiled from Wikipedia and the sources listed below. Text from Wikipedia is available under CC BY-SA 4.0; this entry is adapted from it.
- Wikipedia: Rho Pegasi (CC BY-SA 4.0).
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