Jupiter, Io & GRS Part II - 4am January 16th

[davidpretorius]

Ok, i have had a look at starry night (jupiter II program still to be downloaded)

Lets try again.

Starts at 3.40am and finishes 5.30am odd.

I am thinking 90 second avi's @ 10fps and say every every 5-10 minutes.

what was everyones experience from last time. will 90 seconds give a nice round io shadow or will it suffer "star trail" like problems??

Any ideas

[asimov]

No idea really Dave. Perhaps play it safe & go with 75-80 seconds? Not sure.

[iceman]

90 seconds is fine, Io doesn't move that quick. It really depends on your focal length. If you're bird, working at 10000mm then 90 seconds *may* be too much for him (i'm sure he's done the calculations), but with our short focal length newts 90 seconds should be fine.

Do a first run and give it a quick process to see.. Also, it depends what you align on in registax. You can probably do 2 passes through registax, one for the planet and one for the moon/shadow, and then stack/combine them after.

[davidpretorius]

thanks ice, as usual i am thinkinig that this will be the last io transit with the GRS also in view before the world as we know it comes to an end.

i iwill give it a rip!

[davidpretorius]

Fingers crossed: last nights seeing was looking very good, saturn was very still on the computer screen at 1000x mag, but as i was still focussing, the clouds moved in and never left!!!


so from 3.30 am est, i hope to start getting something decent of jupiter and its moon!

It will be 42 degree at 5:20, so please weather gods, be nice to IIS members tohight!!!

[asimov]

Well good luck with it mate...no need to wish me any...Clouded over as usual!

[iceman]

Cloudy here :(

[asimov]

Well it's come good here...so I'm gunna see what I can get! thank you weather gods!

[davidpretorius]

11pm clouded in.

3am, clouds gone

3-3.45am saturn

4 - 5.30 10 gbytes of jupiter

here is a quick one shot at 320 x 200 , but with my hartmann mask, i was processing as i took my 2min videos, and i think it is starting to dawn on me that a aperture mask is required to stop the awful fringing i am getting, so i used my hartmann mask to see what would happen and instant improvement.

I will have to wade thru to see if most of the session is wasted due to fringing, but i have learnt something.

Not a perfect session, by any means, but i have solved a problem and that is always satisfying!

[iceman]

Looking great!

1. Why are you getting fringing? What type of fringing are you talking about? Yuo have a reflector not a refractor??
2. Why are you shooting at 320x240 instead of 640x480?

Your preview shot looks very nice, can't wait to see the results of your night.

[asimov]

That's a 'quick one' ?? That's a rippa! :scared:

Looks like the refractor has me over a barrel for jupiter....No matter what I try I get purple bands!...I HATE PURPLE BANDSSSSSS!!......NOOOOO! :sad:

Damn....Another mountain to climb working out the settings for jupiter with a refractor! *sigh!!* I also had to move the scope to another place because theres a darn tree in the way for Joop! Right on top of an ants nest I had to setup didn't I!! I just spend an hour killing ants in the kitchen 'cos the laptop was covered in 'em when I brought it in!!

Ok, I'm thru venting for now...:P (me no like jupiter!)

[davidpretorius]

I have noticed a trend in my jupiters of where the bands meet the edge of the planet, the shape is wierd and also as the day was getting lighter, i noticed the image on the screen there seemed to be a ring around then 10% outer edge of the planet all the way around. I have been putting down the poor stacked results to seeing, but as I have been making sure temps are within 1.5 degrees. The seeing was great tonight say 7/10, so there must be something else. I have video from raw format, 320 x 240 and 640 x 480. The only way i can describe it was it seemed similiar to rob and asimov's mars discussions re fringing, so i thought i would throw the hartman mask on to see what would happen and straight away the image on the screen improved???
320x240 to be able to get a quick result whilst taking the next video, i can stack that quicker. also, if the 640 x 480 look crap, then i can process the sized down ones!
lots of post imaging work ahead of me!

[asimov]

Are you using the raw aluminium adapter on the toucam Dave, or the black one.

[matt]

Dave

Sorry if this seems a silly question/ but what exactly are you referring to re: 320x240 Vs 640x480???

Is that your lappie on-screen resolution????

Cheers mate

Nice image, by the way.:)

[iceman]

Matt, it's the capture resolution that you set in k3ccdtools (or other capture program).

640x480 is the max resolution of the ToUcam, but you can also capture at 320x240 - which has 2 advantages:
- Smaller amount of data being transferred down the USB1.1 pipe, meaning less compression even at 15fps
- Faster processing

But the major disadvantage:
- Image Scale. The end result will be half as big and if the seeing is really good, you usually want the biggest image you can get.

[matt]

Thanks Mike

[davidpretorius]

black anodized