Back HAT-P-1b Arabic HAT-P-1b Czech HAT-P-1b German HAT-P-1b Spanish HAT-P-1 b French HAT-P-1 Croatian HAT–P–1 b Hungarian HAT-P-1b ID HAT-P-1 b Italian HAT-P-1b Japanese
 Size comparison of HAT-P-1b with Jupiter. | |
| Discovery | |
|---|---|
| Discovered by | HATNet Project[1] |
| Discovery site | Arizona and Hawaii[1] |
| Discovery date | Thurs, Sept 14, 2006[2] |
| Transit, radial velocity[1] | |
| Orbital characteristics | |
| 0.05561 ± 0.00083 AU (8,319,000 ± 124,000 km)[3] | |
| Eccentricity | <0.067[4] |
| 4.4652968 ± 0.0000018[5] d | |
| Inclination | 85.634 ± 0.056[3] |
| Semi-amplitude | 59.3 ± 1.4[4] |
| Star | HAT-P-1 (ADS 16402 B) |
| Physical characteristics | |
| 1.319 ± 0.019[3] RJ | |
| Mass | 0.529 ± 0.020[5] MJ |
| Temperature | 1322 ± 15[3] K |
HAT-P-1b is an extrasolar planet orbiting the Sun-like star HAT-P-1, also known as ADS 16402 B. HAT-P-1 is the dimmer component of the ADS 16402 binary star system. It is located roughly 521 light years away from Earth in the constellation Lacerta. HAT-P-1b is among the least dense of any of the known extrasolar planets.
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