LtE in CMO #257

From Brian COLVILLE

@ . . . . . . Subject: Jupiter - Jan 27

Hello everyone...I have attached images of Jupiter taken on January 27 between 01:29 UT and 03:54 UT. The sequence covers the GRS transit through its disappearance around the limb.

Seeing was actually good, 8/10 on average but cloud cover increased as the evening went on and by the final sets of images we had thick cirrus clod cover. All images were taken with either the broadband IR passing or the methane bandpass filter. The first images taken around 01:30 were soft and after re-focusing the later images are much sharper. Unfortunately, there is a gap between 01:44 and 02:56 when I had to go inside and help get the kids settled.

A few notes on the images.

a.. BA is clearly visible in both the IR and methane images. I cannot detect the smaller white oval between BA and GRS (in methane band)as has been observed in other images. The hi-res IR image at 03:12 does show the spot north of BA, but it is close to the limb, but visible against the GRS hollow.

b.. in the IR images between 01:39 and 03:38 there is a pronounced white spot on the s.edge of the NEB with a dark bridge of material surrounding it. This feature is only weakly visible in the methane images.

c.. the prominent jet of material off of the NEB into the EZ (approaching the CM in the 03:54 image) is visible in both IR and methane.

d.. there is a very prominent white oval at the southern edge of the NPR, in the NNTeZ ?, which is visible in both wavelengths.

e.. the dark spot on the N edge of the NEB is not recorded in the IR or methane images. It was very prominent visually and shows up in the unfiltered image at 03:45 UT. This feature is very prominent in Clays colour images.

f.. the NPR has several dark and light mottles, which initially appear as image defects, but to me they have rotated with the planet

g.. the STeZ has a very angular appearance, tapering very close to the SEB near the GRS and moving south in latitude as you approach the opposite limb. This is visible in the unfiltered, IR and methane images.

Please let me know if anyone has any questions or comments.

(28 January 2002 email)

@ . . . . . . Subject: Jupiter image 02/10/02

Hello fellow observers...

I have attached a set of images taken on February 10, 2002.

These images cover the RGB, IR, Methane, and unfiltered portions of the spectrum.

Details on image. Please let me know if you have any questions.

Take care,

(17 February 2002 email)

@ . . . . . . Subject: Jupiter Feb 19

Hello everyone... A set of images taken on Feb 19 using both the CCD and web cam. Details on image.

Note, the CM in the WebCam image is CM I 135, CM II 283. I missed adding the data to the image. Focus was soft on the CCD images, but the WebCam performed well.

Take care,

(24 February 2002 email)

Brian COLVILLE (Cambray, Ontario, Canada)

Maple Ridge Observatory

maple@quicklinks.on.ca

www.quicklinks.on.ca/~maple

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