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Fourth-magnitude star in the constellation Pegasus
λ Pegasi
Location of λ Pegasi (circled)
Observation dataEpoch 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 pc )
Absolute magnitude (MV ) -1.45
[5] Details
Mass ~1,5
[3]
M ☉
Radius 28.5
[3]
[6]
R ☉
Luminosity 390
[3]
L ☉
Temperature 4,933
[7]
K
Metallicity [Fe/H]0.12
[7]
dex
Rotational velocity (v sin i ) 8.0
[8] 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
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 ☉ R ☉ 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.
^
a b c d e f van Leeuwen, F. (November 2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics . 474 (2): 653–664.
arXiv :
0708.1752 .
Bibcode :
2007A&A...474..653V .
doi :
10.1051/0004-6361:20078357 .
S2CID
18759600 . ^
a b c Ducati, J. R (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". CDS/ADC Collection of Electronic Catalogues . 2237 .
Bibcode :
2002yCat.2237....0D . ^
a b c d e 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 .
^ Soubiran, C; Bienaymé, O; Mishenina, T. V; Kovtyukh, V. V (2008). "Vertical distribution of Galactic disk stars. IV. AMR and AVR from clump giants". Astronomy and Astrophysics . 480 (1): 91–101.
arXiv :
0712.1370 .
Bibcode :
2008A&A...480...91S .
doi :
10.1051/0004-6361:20078788 .
S2CID
16602121 . ^
a b
"λ Pegasi" .
Wolfram Alpha . Retrieved 2012-08-28 .
^ Kaler, James B.
"SADALBARI (Lambda and Mu Pegasi)" . Stars . University of Illinois. Retrieved 2012-08-28 . ^
a b 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.
arXiv :
1111.5449 .
Bibcode :
2012A&A...538A.143K .
doi :
10.1051/0004-6361/201118065 .
S2CID
53999614 .
^ Hekker, S.; Meléndez, J. (December 2007). "Precise radial velocities of giant stars. III. Spectroscopic stellar parameters".
Astronomy and Astrophysics . 475 (3): 1003–1009.
arXiv :
0709.1145 .
Bibcode :
2007A&A...475.1003H .
doi :
10.1051/0004-6361:20078233 .
S2CID
10436552 .
