Hello,
Last night I managed to record Uranus and four of his moons; Ariel, Umbriel, Titania and Oberon. SkyTools provides the following details for Uranus and his daughters:
Uranus:
Magnitude 5.80, Size 3.6"
Earth Distance: 19.7 AU, Diameter: 51118.0 km
Satellites:
Name Mag Sep"
Ariel 14.4 13.1
Umbriel 15.1 17.9
Titania 14.0 30.4
Oberon 14.2 40.2
Details:- Celestron C9.25 F10 SCT with Tak x1.6 Extender (efl of 3760mm at F16).
- SBIG ST2000 with CFW10.
- Combination of 10x30sec, 10x15sec and 10x5 sec exposures blended in CS5.
- 15th July 2010. Brisbane, Qld, Australia.
I have previously recorded these 4 brighter moons of Uranus using a TeleVue x2.5 PowerMate and last night found the task slightly more difficult due to the lesser magnification of the Tak x1.6 Extender, although the smaller pixels on the ST2000 (7.5μ) compared to my ST7 (9μ) marginally offset this.
This is not a “scientifically” accurate image in terms of brightness and colour, due to the extensive dodging and burning performed to balance the enormous brightness variation between these bodies.
Thanks for looking!
Cheers
Dennis