So if I run KStars for my location and, say 7 PM Dec 8, it thinks 46P/Wirtanen is 3h 39m 17s, +6° 16' 00". Easy-peasy. Since that's what I usually use to point my scope, I'm ready to go...right?
Except if I ask, say, the SkyLive Blog or JPL's Horizons ephemeris, translating local to UTC, I get significantly different answers. (Can't get the table formatted, so doing a screen shot -- sorry!)
Is there that much of a difference between the J2000 and J2018 epochs? Or is something else going on here? Should be something like 15' discrepancy, right, not 9 degrees!
Edited by fewayne, 06 December 2018 - 02:26 PM.