HAT-P-4
HAT-P-4 is a wide binary star consisting of a pair of G-type main-sequence stars in the constellation of Boötes. It is also designated BD+36°2593.
The star exhibits an infrared excess noise of unknown origin.
Planetary System
The primary star is home to the transiting extrasolar planet HAT-P-4b. This planet is a fairly typical hot Jupiter type planet in a 3-day orbit.
Binary companion
The companion star is located at a distance of 28446 astronomical units and therefore has an orbital period that is extremely long.
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | 0.651+0.033 −0.037 MJ |
0.04449+0.00083 −0.0012 |
3.0565254±0.0000012 | <0.0073 | — | 1.28 −0.015 RJ |