Solar Proms

Thanks guys. Wanted to check this out again this lunchtime, but all clouded out again.

The image scale is scary but I remember two years ago shortly after I received the PST that there was a truly massive prominence. It was easily three times longer than this one. Now that really was a sight to behold!

Trev

Great image Trevour! Very dynamic. How do you calculate th Earth size??

DaveG

Hi Dave,

I took the angular size of the Sun to be 30 arcminutes and with a diameter 110 times that of the Earth. So if the Earth were in the shot it would be 32/110 arcminutes in width.

Then from Wodaski's ccd calc app we have an image scale of the Webcam (with the Sony ICX chip) on the PST as 2.88 arcsecs/pixel.

So that gives a pixel size for our fictional Earth as

2.88 arcsec/pix * Earth width = 32X60/110 arcseconds
Earth Width = 5.7 arcseconds

& now it's 5 times that figure to deal with the Powermate. So I just set the width of the globe to around 28 pixels.

Couldn't think of another way to do it until I remembered that image scale stat that Wodaski's calculator gave.

Cheers,

Trev

Hi Trev,

Very nice well captured Mars is now becoming more sociable looking forward to seeing some Mars images from you.