KOI-81

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KOI-81
Observation data
Epoch J2000      Equinox J2000
Constellation Cygnus
Right ascension 19h 35m 08.577s[1]
Declination +45° 01′ 06.58″[1]
Apparent magnitude (V) 11.349[2]
Characteristics
Spectral type B9-A0V[3]
B−V color index 0.204[2]
Details
Mass 2.71+0.19
−0.11
[3] M
Radius 2.93 ± 0.14[3] R
Luminosity 77.3 ± 9.6[3] L
Temperature 10000[3] K
Other designations
KIC 8823868, 2MASS J19350857+4501065, GSC2.3 N2K9001230

KOI-81 is an eclipsing binary star in the constellation of Cygnus. The primary star is a late B-type or early A-type main-sequence star with a temperature of 10,000 K (9,700 °C; 17,500 °F). It lies in the field of view of the Kepler Mission and was determined to have an object in orbit around it which is smaller and hotter than the main star.[4]

KOI-81b

KOI-81b is a hot compact object orbiting KOI-81. It was discovered in 2010 by the Kepler Mission and came to attention because of its small size and high temperature of 17,000 K (16,700 °C; 30,100 °F).[4] The orbit of KOI-81b around the main star takes 23.8776 days to complete. Analysis of relativistic effects in the Kepler light curve suggests that it is a low-mass white dwarf of approximately 0.3 solar masses, produced by a previous stage of mass transfer during the object's giant phase.[3]

See also

References

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Coordinates: Sky map 19h 35m 08.57s, +45° 01′ 06.6″


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