HAT-P-21. Add transit time. Source: http://dx.doi.org/10.1088/0004-637X/742/2/116
HAT-P-22. Added transit time. Source: http://dx.doi.org/10.1088/0004-637X/742/2/116
HAT-P-23. Added transit time. Source: http://dx.doi.org/10.1088/0004-637X/742/2/116