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
- KOI-74, a similar system also discovered by the Kepler Mission.
- Kepler Object of Interest, stars observed to have transits by the Kepler Mission
References
- ↑ 1.0 1.1 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 2.0 2.1 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 3.0 3.1 3.2 3.3 3.4 3.5 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 4.0 4.1 Lua error in package.lua at line 80: module 'strict' not found.
Coordinates: 
19h 35m 08.57s, +45° 01′ 06.6″
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