Darrell Spencer wrote: > minute past the background starfield. I've never observed anything > natural outside our atmosphere with such drastic apparent motion. In 1983, I did almost zero observing thanks to college, but I did take a trip out to the farm land to see Comet IRAS-Araki-Alcock at closest approach. At 5 million km, it was only one-tenth of the current distance to Comet Lulin. If I remember correctly, it moved 45 degrees in a single night. At 100x, it was not difficult to see the comet move "in real time" against the star field. Regarding the orbital crossing event, I'd say that it has been occurring very gradually over the past month, since the inclination of Comet Lulin's orbit to the ecliptic is nearly nil. Tom -- See message header for info on list archives or unsubscribing, and please send personal replies to the author, not the list.