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If object 2 moves away from object 1 at a speed of 0.8c for 3 years...

If object 2 moves away from object 1 at a speed of 0.8c for 3 years as measured by object 2 and then returns to object one at the same speed, how much time has passed in the frame of reference of object 1. I get 6.8 years.

If object 2 sends signals to object 1 once a year as measured by object 2, show that the first three signals are received by object 1 after 3, 6 and 9 years, respectively. What would this look like on a space-time diagram in object 1's frame of reference?

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