Chart showing comet C/2014 S2 PanSTARRS close to M108 and the Owl Nebula on 18 April 22:00 (19 April UTC) as seen from Mayhill New Mexico. The large rectangle is the filed of view of T14/20, the small that of T5. Click to embiggen.
While at lot of attention has been focused on the unexpectedly bright comet 252P, and the spectacle of comet 67P going through the Leo Triplet, comet C/2014 S2 PanSTARRS has also been brighter than expected.
Only visible to the northern scopes at the moment, it is passing through Ursa Major and is currently magnitude 10 rather than magnitude 16.
From April the 16th to the 20th (local time Mayhill 17th to 21st UT) the comet will be within T14/T20 range of the magnitude 10 galaxy M108 and the magnitude 10 Owl Nebula. On the 18th it passes between M108 and the Owl Nebula (see chart above).
The low surface brightness of these objects means that longer exposures are needed. However, since the comet is withing scope travel from astronomical twilight to around 3 am there is plenty of time. On the other hand the waxing Moon will interfere until around mid morning.
CK14S020 2015 12 09.8045 2.100659 0.987636 87.8098 8.1225 64.6704 20160113 10.0 4.0 C/2014 S2 (PANSTARRS)