Hi Ken
That is an excellent image of M104, and Asteroid 7 Iris. See below links for further details on this encounter where I managed to record the same event using my Mewlon 180mm ‘scope and produced an animation of the event.
http://www.iceinspace.com.au/forum/s...ad.php?t=31613
http://www.iceinspace.com.au/forum/s...ad.php?t=31492
Cheers
Dennis