I was gonna have a go at sketching the Sombrero galaxy (m104) last night - but alas, sod's-law - just as it was coming to a good position, the flippin' sky clouded over
Henry'll probably already realise this - but objects low down in Virgo - like the Sombrero - only give us in UK a limited time-frame per year to catch them.
Also, when sketching, you want things to be as high in the sky as possible, so you can see them better.
When something is low near the horizon, you are looking out of the atmosphere at a shallow angle, through A LOT of moving air. High magnification telescope images wobble about a lot, and swim in and out of focus - the effect is like trying to see something on the bottom of a fast-flowing stream.
The Sombrero currently reaches it's highest point at around 11pm - so I timed it to give me half an hour either side of that for sketching.
Then exactly on cue, at around 10:30, the soddin' clouds moved in