The Planet Uranus and its moons, Oberon, Ariel, and Titania December 11, 2014

The Planet Uranus and its moons, Oberon, Ariel, and Titania December 11, 2014

Uranus and it's moons, Oberon, Ariel, and Titania - December 11, 2014

Uranus and it’s moons, Oberon, Ariel, and Titania – December 11, 2014

Object Name (Uranus with moons)
Object Type (Planet and satellites)
Location : Observatoire Astronomique de Bauduen, Provence France
Date 2014 Dec 11th
Media (graphite pencil, and inverted watercolor on white paper, Paint.net for the inversion)
That’s maybe because I like to use this great telescope, or it’s because I like challenges but,… it’s certainly not the best optical combination for this observation.
On 11 December, I finally found a corner of pure sky above the 24-inch reflector made by Olivier Planchon. To observe Uranus, the speed is definitely too high: f / 3.3 d, so we had to use very short focal EP to reach the useful magnification (Nagler 3.7 and 2.5) !.
If you look at my watercolor you can see a somewhat elongated comet hair that diffuse around the planet, that’s exactly how we see the planet area in the field, this is probably linked to a not 100% perfect collimation, but still. I get the impression that the work of collimation facing these big tubes, it is not a piece of cake.
Anyway, we can say two things:
1- We observed three of the Uranus satellites: Oberon, Titania and Ariel, this last one being a bit lost in the lights of the planet
2- the disk of the planet was not uniform as seen in a small telescope or some photos. It’s very difficult to confirm, but a diffuse zone clearer was observed in the upper atmosphere of Uranus, is that an artifact, I do not know? Anyway the main direction of the area is not in the direction of the cloud bands of Uranus.

Another composition of this observation is given here: http://astro.aquarellia.com/croquis/uranus_page_h.jpg