Lambda Pegasi

Lambda Pegasi
Diagram showing star positions and boundaries of the Pegasus constellation and its surroundings


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) 3.96[1]
Characteristics
Spectral type G8II-III[2][3]
U−B color index +0.96[1]
B−V color index +1.07[1]
Astrometry
Radial velocity (Rv)-3.9[1] km/s
Proper motion (μ) RA: 55.75[1] mas/yr
Dec.: -10.15[1] mas/yr
Parallax (π)8.93 ± 0.24[4] mas
Distance365 ± 10 ly
(112 ± 3 pc)
Absolute magnitude (MV)-1.45[3]
Details
Mass~1,5[2] M☉
Radius28.5[2][5] R☉
Luminosity390[2] L☉
Temperature4,933[6] K
Metallicity [Fe/H]0.12[6] 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
SIMBADdata

Coordinates: 22h 46m 31.9s, +23° 33′ 56.0″

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

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☉.[2] Its apparent magnitude was calibrated in 1983 at 3.96, yielding an intrinsic brightness of -1.45.[3] Parallax calculations place the star at a distance of roughly 112 parsecs from Earth, or 365 ± 10 light years away,[4] 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.

See also

References

  1. 1 2 3 4 5 6 7 8 "SIMBAD query result: lam Peg -- Star". Centre de Données astronomiques de Strasbourg. Retrieved 2012-08-28.
  2. 1 2 3 4 5 Smith, G. (November 1998). "Stellar atmospheric parameters for the giant stars MU Pegasi and lambda Pegasi" (PDF). Astronomy & Astrophysics. 339: 531–536. Bibcode:1998A&A...339..531S. Retrieved 2012-08-28.
  3. 1 2 3 "λ Pegasi". Wolfram Alpha. Retrieved 2012-08-28.
  4. 1 2 van Leeuwen, F. (November 2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. Bibcode:2007A&A...474..653V. arXiv:0708.1752 Freely accessible. doi:10.1051/0004-6361:20078357.
  5. ↑ Kaler, James B. "SADALBARI (Lambda and Mu Pegasi)". Stars. University of Illinois. Retrieved 2012-08-28.
  6. 1 2 Koleva, M.; Vazdekis, A. (February 2012). "Stellar population models in the UV. I. Characterisation of the New Generation Stellar Library". Astronomy & Astrophysics. 538, id.A143: A143. Bibcode:2012A&A...538A.143K. arXiv:1111.5449 Freely accessible. doi:10.1051/0004-6361/201118065.
  7. ↑ Hekker, S.; Meléndez, J. (December 2007). "Precise radial velocities of giant stars. III. Spectroscopic stellar parameters". Astronomy and Astrophysics. 475 (3): 1003–1009. Bibcode:2007A&A...475.1003H. arXiv:0709.1145 Freely accessible. doi:10.1051/0004-6361:20078233.
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