Lambda Pegasi

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title: "Lambda Pegasi" type: doc version: 1 created: 2026-02-28 author: "Wikipedia contributors" status: active scope: public tags: ["bayer-objects", "g-type-giants", "pegasus-(constellation)", "g-type-bright-giants", "flamsteed-objects", "hipparcos-objects", "henry-draper-catalogue-objects", "bright-star-catalogue-objects", "durchmusterung-objects"] description: "Fourth-magnitude star in the constellation Pegasus" topic_path: "general/bayer-objects" source: "https://en.wikipedia.org/wiki/Lambda_Pegasi" license: "CC BY-SA 4.0" wikipedia_page_id: 0 wikipedia_revision_id: 0

::summary Fourth-magnitude star in the constellation Pegasus ::

| name=λ Pegasi | image= |image=Pegasus constellation map.svg|alt=|float=center|width=280 |label=|position=right |mark=Red circle.svg|mark_width=8|mark_link=λ Peg |x=480|y=380 |caption=Location of λ Pegasi (circled) | epoch = J2000 | ra = | dec = | appmag_v = 3.93 | constell = Pegasus | class = G8II-III{{cite journal | author=Smith, G. | title=Stellar atmospheric parameters for the giant stars MU Pegasi and lambda Pegasi | journal=Astronomy & Astrophysics |date=November 1998 | volume=339 | pages=531–536 | url=https://articles.adsabs.harvard.edu/cgi-bin/nph-iarticle_query?1998A%26A...339..531S&data_type=PDF_HIGH&whole_paper=YES&type=PRINTER&filetype=.pdf | bibcode=1998A&A...339..531S | accessdate=2012-08-28}} | b-v = +1.07 | u-b = +0.93 | variable= | radial_v=-4.15 | prop_mo_ra=55.75 | prop_mo_dec=-10.15 | parallax=8.93 | p_error=0.24 | parallax_footnote={{cite journal | author=van Leeuwen, F. | title=Validation of the new Hipparcos reduction | journal=Astronomy and Astrophysics |date=November 2007 | volume=474 | issue=2 | pages=653–664 | bibcode=2007A&A...474..653V | doi=10.1051/0004-6361:20078357 |arxiv = 0708.1752 | s2cid=18759600 | absmag_v=-1.45{{cite web |title=λ Pegasi |publisher=Wolfram Alpha |url=https://www.wolframalpha.com/input/?i=lambda+pegasi |accessdate=2012-08-28}} | source = | mass= | radius= | luminosity= | temperature= | metal_fe= | gravity = | rotational_velocity=8.0{{cite journal | author=Hekker, S. | author2=Meléndez, J. | title=Precise radial velocities of giant stars. III. Spectroscopic stellar parameters |date=December 2007 | journal=Astronomy and Astrophysics | volume=475 | issue=3 | pages=1003–1009 | doi=10.1051/0004-6361:20078233 | bibcode=2007A&A...475.1003H |arxiv = 0709.1145 | s2cid=10436552 | age_gyr= | names=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 | Simbad=HD+215665 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 and radius that is , the star boasts a bolometric luminosity that is roughly . Its apparent magnitude was calibrated in 1983 at 3.96, yielding an absolute magnitude of -1.45. Parallax calculations place the star at a distance of roughly 112 parsecs from Earth, or 365 ± 10 light years away, 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.

References

References

1. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". CDS/ADC Collection of Electronic Catalogues.
2. (2008). "Vertical distribution of Galactic disk stars. IV. AMR and AVR from clump giants". Astronomy and Astrophysics.
3. (2024-02-01). "Gaia FGK benchmark stars: Fundamental Teff and log g of the third version". Astronomy and Astrophysics.

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