1st Jupiter on 03-03-2005 on EQ platform

[Raymond]

Dear all,

Jupiter was imaged when it was about 45 degree high. The atmosphere was not stable but I just tested the equipment setting.

CZ 12.5-inch Dob with primary mirror at F5 on top of Tom O EQ Platform. Visual drift alignment was done for better polar alignment.

Taken at 10 fps; shutter speed 1/33; gain 20%; saturation 50%; gama 5%. 2x Powermate with effective F-ratio at F10.

1200 frames stacked in Registax 3.

Next time I shall try to image at F20-F25 and to add IR-cut filter when Jupiter is near the zenith.

http://www.hkastroforum.net/bbs/files/jup5-1a.jpg

Raymond Tse, Hong Kong

[iceman (Mike)]

Great job Raymond, thanks for posting! (just moved it to the solar system forum, too).

I think in stable seeing you'll get a great image!

[Striker (Tony)]

Nice job Raymond.....for some reason I see Hong Kong to be light poluted......correct me if i'm wrong...

[Comet Hunter]

Great shot Raymond! Well done!

[janoskiss (Steve H)]

Nice one! Welcome Raymond!

[Raymond]

Dear Striker,

You are right. HK is light polluted. I started off by doing astrography on deep sky but this is the area where light pollution hurts most.

Besides, we also have another more serious problem, dust/haze pollution caused by industrial polluants such as sulphur and other dioxides from the rapid industrial growing Delta Pearl area in Guangdong province, just north of HK.

I therefore diversify into Planet/Moon imaging, which will increase by astro time. Imaging on planets and the Moon is not much affected by light pollution (I live in downtown) but dust/haze pollution will hurt everyting.

Other friends,

Thanks for the encouragement. I used Hartmann mask (inverse triangular type) which I learned from this forum. Thanks for sharing your valuable experience here.

I used Feathertouch dual speed focuser which makes focusing easy under Hartmann mask. I am considering upgrading to Robo-Focus to achieve better focusing accuracy.

Jupiter was higher up when I disembled the setup at 2 am. I believe that better contrast can be obtained when it is up at the zenith.


Raymond

[rumples riot]

Nice image, keep them coming.

[[1ponders] (Paul)]

Raymond. I like the contrast you have in your shot. It's really brought out some great colour in the banding

[quicksimon]

Raymond
As paul has said great cloud colours, looking good
Simon

[Astroman (Andrew Wall)]

Great shot there Raymond, well done. Look forward to seeing some more.