Mu Pegasi
Observation data Epoch J2000.0 Equinox J2000.0 |
|
---|---|
Constellation | Pegasus |
Right ascension | 22h 50m 00.19315s[1] |
Declination | +24° 36′ 05.6984″[1] |
Apparent magnitude (V) | 3.514[2] |
Characteristics | |
Spectral type | G8 III[3] |
U−B color index | +0.674[2] |
B−V color index | +0.932[2] |
Astrometry | |
Radial velocity (Rv) | +13.54 ± 0.20[4] km/s |
Proper motion (μ) | RA: +144.70[1] mas/yr Dec.: –41.87[1] mas/yr |
Parallax (π) | 30.74 ± 0.27[1] mas |
Distance | 106.1 ± 0.9 ly (32.5 ± 0.3 pc) |
Absolute magnitude (MV) | 0.432[5] |
Details | |
Mass | 1.3[6] M☉ |
Radius | 9.6 ± 0.4[7] R☉ |
Surface gravity (log g) | 2.50[3] cgs |
Temperature | 4,950[3] K |
Metallicity [Fe/H] | –0.03[3] dex |
Rotational velocity (v sin i) | 4.0[8] km/s |
Other designations | |
Mu Pegasi (μ Peg, μ Pegasi) is a star in the northern constellation of Pegasus. It has the traditional name Sadalbari, which derives from the Arabic term for "luck star of the splendid one".[10] The apparent visual magnitude of this star is 3.5,[2] which is bright enough to be seen with the naked eye even on a moonlit night. The distance to this star can be determined with parallax measurements, which yields a value of 106.1 light-years (32.5 parsecs).[1]
The spectrum of this star matches a stellar classification of G8 III.[3] The luminosity class of 'III' means that it has exhausted the hydrogen fuel at its core and evolved into a giant star. It is slightly more massive than the Sun, but has expanded to nearly ten times the Sun's radius.[7] (Mishenina et al. (2006) list it with an estimated 2.7 times the mass of the Sun.[5]) The effective temperature of the outer atmosphere is about 4,950 K,[3] which is cooler than the Sun and gives it the yellow hue of a G-type star.[11][12] The abundance of elements other than hydrogen and helium, what astronomers term the metallicity, is similar to the abundance in the Sun.[3]
References
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