Lambda Pegasi

Lambda Pegasi (λ Peg, λ Pegasi) is a fourth-magnitude star in the constellation Pegasus.

λ Pegasi

Location of λ Pegasi (circled)
Observation data Epoch J2000      Equinox J2000
Constellation	Pegasus
Right ascension	22h 46m 31.87786s[1]
Declination	+23° 33′ 56.3561″[1]
Apparent magnitude (V)	3.93[2]
Characteristics
Spectral type	G8II-III[3]
U−B color index	+0.93[2]
B−V color index	+1.07[2]
Astrometry
Radial velocity (Rv)	-4.15[4] km/s
Proper motion (μ)	RA: 55.75[1] mas/yr Dec.: -10.15[1] mas/yr
Parallax (π)	8.93±0.24 mas[1]
Distance	365 ± 10 ly (112 ± 3 pc)
Absolute magnitude (MV)	-1.45[5]
Details[6]
Mass	3.944±0.152 M☉
Radius	28.254±1.633 R☉
Luminosity	397±30 L☉
Surface gravity (log g)	2.12±0.08 cgs
Temperature	4,848±109 K
Metallicity [Fe/H]	−0.07±0.06 dex
Rotational velocity (v sin i)	8.0[7] km/s
Other designations
λ Peg, 47 Peg, HR 8667, BD+22°4709, HD 215665, FK5 859, HIP 112440, SAO 90775, GC 31776, IRAS 22441+2318, 2MASS J22463188+2333564
Database references
SIMBAD	data

λ Pegasi is a yellow giant with stellar classification G8II-III. With a mass of 1.5 M_☉ and radius that is 28.5 R_☉, the star boasts a bolometric luminosity that is roughly 390 L_☉.^[3] Its apparent magnitude was calibrated in 1983 at 3.96, yielding an absolute magnitude of -1.45.^[5] Parallax calculations place the star at a distance of roughly 112 parsecs from Earth, or 365 ± 10 light years away,^[1] about three times the distance of its line-of-sight double μ Pegasi.

In the constellation, Lambda and Mu lie to the southwest of Beta Pegasi, the nearest bright star.