You can use a sсript (or a program for calculating asteroids) to see the way of the asteroid in the next one day, so you can write it on a text editor or something else, all the asteroids you are used.For example:
An asteroid is on 2:5:10, and will move in 15:10:00.His speed (one way time) is 30 mins.
It's a part of the table, that the program makes:
Цитат15:10:00 [2:5:11]
15:40:00 [2:5:12]
16:10:00 [2:5:13]
16:40:00 [2:5:14]
17:10:00 [2:5:15]
17:40:00 [2:6:1]
18:10:00 [2:6:2]
18:40:00 [2:6:3]
19:10:00 [2:6:4]
19:40:00 [2:6:5]
20:10:00 [2:6:6]
20:40:00 [2:6:7]
21:10:00 [2:6:8]
21:40:00 [2:6:9]
22:10:00 [2:6:10]
22:40:00 [2:6:11]
23:10:00 [2:6:12]
23:40:00 [2:6:13]
00:10:00 [2:6:14]
00:40:00 [2:6:15][/quote]
So after 5 hours (22:00), when you search for asteroids again, and see an asteroid in 2:6:9, you can check the table, if the asteroid coincides.
(between 21:40 - 22:10 the asteroid is on 2:6:9)