This depends when Fajr is due. You must not depend on the Hanafi timetable as their Fajr and Asr are wrong and not according to the sunnah.

I follow a hanifi salah timetable.Fajr starts at 5.30 can I read witr at 5.15 after tahajjud

Prayer | October 1, 2017 5:28 am
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i play sports for a local club on satuerday sometimes we play against opposition far away in the village , here there is no mosque so I have to pray at the ground either on my own or with a few lads if i can convince them to pray. Is this permissible?
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In fard prayer when I find the imam in rukuh I don’t join him there rather wait for him to go to sujood and then I join him. Because I know that without fatiha my rakah is invalid. But I have also heard you saying if I join during rukooh my rakah is valid. Which one is corrert?