The ring material is preferentially aligned by the gravitational effects (maybe the magnetic effects, too---but I don't know), so there are indeed differences in brightness and polarization between the two ansae. Thus differences in appearance such as you (and many others historically) have observed are not unexpected. You might read through Kerr and Elliot's rings book for some background. \Brian --- This message is from the AZ-Observing mailing list. If you wish to be removed from this list, send E-mail to: AZ-Observing-request@xxxxxxxxxxxxx, with the subject: unsubscribe. The list's archive is at: //www.freelists.org/archives/az-observing This is a discussion list. Please send personal inquiries directly to the message author. In other words, do not use "reply" for personal messages. Thanks.