leguenp2001 Sep 7
On GUIDE9.1 I wanted to know where comet 29P was in the sky in 2009, but the "Goto / Object Name" function did not find it. So I set the date to today and I searched for 29P using the "Goto / Object Name" function. I managed to find it. I went back in time with the function "Animation dialog" and I discovered that 29P disappeared on October 13, 2011 at 16:02 UTC (see screenshots). How do you explain this phenomenon? Is it necessary to set GUIDE to visualize a comet whatever the time?