David. That’s a great image. This is perfect opportunity for Seestar (and other smart scope owners) to do some comet science by estimating the comet’s total magnitude from the green pixels of their images.
As you’ve noticed the MPC ephemeris for this object is way off. Bill Gray’s online ephemeris uses the same astrometry but gets the correct result and I recommend that you use that for now.
https://projectpluto.com/neocp2/mpecs/SWAN25F.htm
This object is still on the PCCP a week after discovery and it has not yet received a formal designation even though there is tons of astrometry and no question about its cometary nature. It is currently around magnitude 8 and, as your image shows, has a nice, but faint, ion tail.