[AZ-Observing] Re: [amastro] blue festoons on Jupiter (in small aperture)
- From: "Wayne (aka Mr. Galaxy)" <mrgalaxy@xxxxxxxx>
- To: amastro@xxxxxxxxxxxxxxx
- Date: Fri, 31 Jul 2009 07:24:41 GMT
15480 Empire Rd.
Benson, AZ 85602
hm ph: 520-586-2244
I just got back in from observing Jupiter with my 13-in f/5 Dob. It is now
midnight local AZ time and the impact site is an hour or so past meridian. I
was using a 7mm eyepiece and the seeing and transparency were pretty good. I
don't know about seeing draping festoons, but I definitely saw a nice navy blue
barge on the south side of the NEB, if that makes sense, at about the same
longitude as the impact site and I have seen white ovals near north of the
site. It was elongated horizontally and appeared denser than the impact site
which appears to still be bi-nuclear with the north-following element still
smaller and denser than the south-preceeding element, which has always been the
case in my several visual observations. I don't know if it was because of our
moon's light pollution causing a loss in contrast, but the impact site seems to
possibly be fading since my last observation the night before. The NEB is very
textured with lots of swirls and eddies in it, while the SEB, other than the
area with the Red Spot and its attending barge, seems to be fading and fairly
featureless.
I also enjoyed the dance of the inner Galilean moons tonight. When I first
started observing Jupiter earlier in the evening, two of the moons were very
close together, one probably had just occulted the other, which I missed, but
the movement among Io, Callisto, and Europa was very evident in the couple
hours that transpired during my observation of the Jovian system.
BTW, I tried observing Jupiter with my 4-inch Astroscan. While this telescope
is great for wide-field views, it is not a planetary scope. The moons are
obvious, surface detail on Jupiter was not.
Clear skies,
Wayne (aka Mr. Galaxy)
---------- Original Message ----------
From: "gnowellsct" <tim71pos@xxxxxxxxxxx>
To: amastro@xxxxxxxxxxxxxxx
Subject: [amastro] blue festoons on Jupiter (in small aperture)
Date: Fri, 31 Jul 2009 01:28:42 -0000
I see blue festoons on Jupiter in my 14" routinely, but had thought that
"color on Jupiter" was generally a product of aperture. In my small scopes (4"
and 5" doublets, one ED, the other fluorite) Jupiter generally yields to
brownishness.
Monday night I caught the Jupiter impact spot with a few club members who were
relishing a rare clear sky here. I had given up on any chance of seeing the
impact site but there it was.
Approximately where the impact site crosses the meridian, further N, there is a
complex of blue festoons in the equatorial region, draped, as it were, from the
NEB. I was quite surprised to be seeing these in my FS128 and I was skeptical
of my own observation, thinking that I was seeing perhaps some grayish streaks
and that I was "painting" with my imagination. The blue festoons were, as they
are typically but not always, closely associated with the NEB. I have detected
festoons in my 4" refractor but more as grayish streaks; it would never occur
to me to call them blue, had I not seen the color in larger instruments.
I was using XWs and ZAO IIs both of which are known for accurate color, 6mm,
5mm, 4mm, and 3.5mm. In the 3.5 and 4mm the color was very hard to make out (as
is typical). 170 to 200x seemed pretty good for the festoon color. Since the
impact spot is much photographed I had no problem finding a recent amateur
image and verifying that there was indeed a complex of blue festoons where I
had observed them.
I was wondering how many other people have seen blue festoons in small
apertures, what the apertures were, and what magnifications were used. I'm also
curious about detection of red/pink in the GRS vs blue. We have least
sensitivity to red wavelengths at night but the red does travel best through
the atmosphere. I'm unsure how the biology of the eye and the physics of light
transmission work in this case.
thanks
Greg N
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