[AZ-Observing] Re: Jupiter (unidentified feature?)
- From: Derrick Lim <antaresv@xxxxxxxxx>
- To: AZ Observing List <az-observing@xxxxxxxxxxxxx>
- Date: Sat, 28 Feb 2015 12:50:09 +0800
Actually the "scar" follows Jupiter's rotation and was supposedly visible
(according to my friend) in the raw capture video. So perhaps its a
sampling artifact? Looking at a bunch of Jupiter photos, I notice such kind
of "scarring" of varying degree in several photos. Its quite confusing.
I guess the question is if this is a genuine phenomena, what could cause
such a feature? Some folks online suggested that such features were
impossible due to very strong winds on Jupiter (upwards of 700km/h).
On Fri, Feb 27, 2015 at 1:16 AM, Padraig Houlahan <pjhmx1@xxxxxxxxx> wrote:
> Since the 'scars' are arc-like with similar curvature to Jupiter's edge, I
> suspect some spatial filters are causing them.
>
> P
>
> Sent from my iPhone
>
> > On Feb 26, 2015, at 9:14 AM, Stan Gorodenski <stanlep@xxxxxxxxxxxxx>
> wrote:
> >
> > Or could the scar be a stand of dust over the chip?
> >
> >
> >> On 2/25/2015 8:11 AM, Padraig Houlahan wrote:
> >> I think it's entirely likely these are imaging artifacts caused by
> various filters. The bright spot, being close to a dark one, suggests
> excessive contrast or some other such filter. As for the 'scar,' I was able
> to find a similar pattern on the lower left which suggests it is noise and
> we see what we want to see. The aggressive image processing needed to get
> good planetary images will produce artifacts every now and then I think.
> >>
> >> PH
> >>
> >> Sent from my iPhone
> >>
> >>
> >>> On Feb 25, 2015, at 2:45 AM, Derrick Lim<antaresv@xxxxxxxxx> wrote:
> >>>
> >>> Hello,
> >>> A friend of mine in Kuala Lumpur, Malaysia imaged Jupiter around 17:06
> UTC
> >>> (1:06am local Malaysian time) on Feb 22nd and recorded an interesting
> >>> feature. I've helped him posted his image on spaceweathergallery.com,
> but
> >>> would also like to see what anyone here thinks of what the feature
> might
> >>> be.
> >>>
> >>> With words, it looks like a disturbance extending from about 80 degree
> >>> north latitude to 20 degrees north where it ends in a bright splotch.
> >>>
> >>> The photos can be found here:
> >>>
> >>>
> http://spaceweathergallery.com/indiv_upload.php?upload_id=109234&PHPSESSID=19ouh96a8ip6ecu4uqtf84sfg1
> >>>
> >>> Any help is appreciated. Thank you!
> >>>
> >>> Derrick Lim
> >>>
> >>>
> >>> --
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> please
> >>> send personal replies to the author, not the list.
> >> --
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