U Peg, BD+15° 4915, HIP 118149, SAO 108933, PPM 143009, WDS J23579+1557A[8]
Database references
SIMBAD
data
U Pegasi is a binary star system in the constellation of Pegasus, abbreviated U Peg. The pair form an eclipsing binary with a combined peak apparent visual magnitude of 9.23,[3] which is far too faint to be visible to the naked eye. During the primary eclipse the magnitude decreases to 10.07, while the secondary eclipse only drops to magnitude 9.73.[3] This system is located at a distance of approximately 596 light years from the Sun based on parallax measurements, but is drifting closer with a radial velocity of around −28.5 km/s.[3]
The variable luminosity of this system was discovered by S. C. Chandler in 1895. He found it to have a continuously varying light curve with a period of 5.192 h.[9] Observing the star photometrically, in 1898 E. C. Pickering and O. Wendell determined a longer period of 8.995 h.[10] H. Shapley published orbital measures for this eclipsing binary in 1913, estimating their relative luminosities and radii.[11] It was determined to be a variable of the W Ursae Majoris type,[12] and in 1945 the orbital period was shown to vary over time.[13]
^ abcCite error: The named reference Anderson_Francis_2012 was invoked but never defined (see the help page).
^ abcdCite error: The named reference GaiaDR3 was invoked but never defined (see the help page).
^ abcdeCite error: The named reference Gontcharov_2006 was invoked but never defined (see the help page).
^ abcCite error: The named reference Lu_1985 was invoked but never defined (see the help page).
^Cite error: The named reference Samus_et_al_2017 was invoked but never defined (see the help page).
^ abcCite error: The named reference Latković_et_al_2021 was invoked but never defined (see the help page).
^ abcdefghCite error: The named reference Pribulla_Vanko_2002 was invoked but never defined (see the help page).
^Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
^Cite error: The named reference Chandler_1895 was invoked but never defined (see the help page).
^Cite error: The named reference Pickering_Wendell_1898 was invoked but never defined (see the help page).
^Cite error: The named reference Shapley_1913 was invoked but never defined (see the help page).
^Cite error: The named reference Schilt_1927 was invoked but never defined (see the help page).
^Cite error: The named reference Recillas_Jones_Woodward_1945 was invoked but never defined (see the help page).
UPegasi is a binary star system in the constellation of Pegasus, abbreviated U Peg. The pair form an eclipsing binary with a combined peak apparent visual...
Epsilon Pegasi (Latinised from ε Pegasi, abbreviated Epsilon Peg, ε Peg), formally named Enif /ˈiːnɪf/, is the brightest star in the northern constellation...
IK Pegasi (or HR 8210) is a binary star system in the constellation Pegasus. It is just luminous enough to be seen with the unaided eye, at a distance...
Beta Pegasi (β Pegasi, abbreviated Beta Peg, β Peg), formally named Scheat /ˈʃiːæt/, is a red giant star and the second-brightest star (after Epsilon Pegasi)...
51 Pegasi (abbreviated 51 Peg), formally named Helvetios /hɛlˈviːʃiəs/, is a Sun-like star located 50.6 light-years (15.5 parsecs) from Earth in the constellation...
Alpha Pegasi (α Pegasi, abbreviated Alpha Peg, α Peg), formally named Markab /ˈmɑːrkæb/, is the third-brightest star in the constellation of Pegasus and...
Gamma Pegasi is a star in the constellation of Pegasus, located at the southeast corner of the asterism known as the Great Square. It has the formal name...
55 Pegasi is a single star in the northern constellation of Pegasus. It is visible to the naked eye as a faint, reddish-hued point of light with a baseline...
V391 Pegasi, also catalogued as HS 2201+2610, is a blue-white subdwarf star approximately 4,400 light-years away in the constellation of Pegasus. The star...
refers to an asterism consisting η Pegasi, λ Pegasi, μ Pegasi, ο Pegasi, τ Pegasi and ν Pegasi. Consequently, η Pegasi itself is known as 離宮四 (Lì Gōng sì)...
AG Pegasi is a symbiotic binary star in the constellation Pegasus. It is a close binary composed of a red giant and white dwarf, estimated to be around...
Chi Pegasi, Latinised from χ Pegasi, is a single star in the northern constellation of Pegasus, along the eastern constellation border with Pisces. It...
asterism consisting ζ Pegasi, ξ Pegasi, σ Pegasi, 55 Pegasi, 66 Pegasi and 70 Pegasi. Consequently, the Chinese name for ζ Pegasi itself is 雷電一 (Léi Diàn...
ν Pegasi, Latinized as Nu Pegasi is a single star in the northern constellation of Pegasus. It is an orange-hued star that is faintly visible to the naked...
consisting of Tau Pegasi, Lambda Pegasi, Mu Pegasi, Omicron Pegasi, Eta Pegasi and Nu Pegasi. Consequently, the Chinese name for Tau Pegasi itself is 離宮五...
Psi Pegasi, which is Latinized from ψ Pegasi, is a binary star system within the great square in the northern constellation of Pegasus. It has a red hue...
and Delta Pegasi (δ Peg). Since the IAU standardized constellation boundaries and widely published them two years after in 1930, the Pegasi alternate...
consisting of Mu Pegasi, Lambda Pegasi, Omicron Pegasi, Eta Pegasi, Tau Pegasi and Nu Pegasi. Consequently, the Chinese name for Mu Pegasi itself is 離宮二...
2 Pegasi is a single star in the constellation Pegasus, located approximately 394 light years away from the Sun based on parallax. It is visible to the...
72 Pegasi is a binary star system in the northern constellation of Pegasus. It is visible to the naked eye as a faint, orange-hued point of light with...
MT Pegasi is a single, yellow-hued star in the northern constellation of Pegasus. It has the designation HD 217813 in the Henry Draper Catalogue; MT Pegasi...
32 Pegasi is a binary star system in the northern constellation of Pegasus. It is visible to the naked eye as a faint, blue-white hued point of light with...
56 Pegasi is a binary star system in the northern constellation of Pegasus. It is visible to the naked eye with a combined apparent visual magnitude of...
Rho Pegasi, Latinized from ρ Pegasi, is a star in the northern constellation of Pegasus, near the southern constellation boundary with Pisces. This is...
78 Pegasi is a binary star system in the northern constellation of Pegasus. It is visible to the naked eye as a faint, orange-hued point of light with...
31 Pegasi is a single star in the northern constellation of Pegasus. It is visible to the naked eye as a dim, blue-white hued point of light with a baseline...
Upsilon Pegasi, Latinised from υ Pegasi, is a star within the great square in the northern constellation of Pegasus. It has the proper name Alkarab /ˈælkəræb/...
Xi Pegasi (ξ Peg, ξ Pegasi) is the Bayer designation for a double star in the northern constellation of Pegasus, the winged horse. Located in the horse's...
1 Pegasi (1 Peg) is a triple star system in the constellation Pegasus, located approximately 156 light years away from the Sun based on parallax. It is...
Global Information