Lambda Pegasi

{{Short description|Fourth-magnitude star in the constellation Pegasus}}

{{Starbox begin

| name=λ Pegasi

}}

{{Starbox image

| image=

{{Location mark

|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)

}}

{{Starbox observe

| epoch = J2000

| ra = {{RA|22|46|31.87786}}

| dec = {{DEC|+23|33|56.3561}}

| appmag_v = 3.93

| constell = Pegasus

}}

{{Starbox character

| 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=http://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=

}}

{{Starbox astrometry

| 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=http://www.wolframalpha.com/input/?i=lambda+pegasi

|accessdate=2012-08-28}}

}}

{{Starbox detail

| source =

| mass={{Val|3.944|0.152}}

| radius={{Val|28.254|1.633}}

| luminosity= {{Val|397|30}}

| temperature= {{Val|4848|109|fmt=commas}}

| metal_fe= {{Val|-0.07|0.06}}

| gravity = {{Val|2.12|0.08}}

| 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=

}}

{{Starbox catalog

| 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

}}

{{Starbox reference

| Simbad=HD+215665

}}

{{Starbox end}}

{{Sky|22|46|31.9|+|23|33|56.0|600}}

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 {{Solar mass|link=y|1.5}} and radius that is {{Solar radius|link=y|28.5}}, the star boasts a bolometric luminosity that is roughly {{Solar luminosity|link=y|390}}. 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.