From Eric NG
® . .
. . . . .Date: Sun, 19 Oct 2003 12:02:47 +0800
Subject: 20031018 Saturn
Dear
friends,
Last night arrived
the observing site lately, so missed the god of war. No choice, wait for Saturn
and Jupiter. Seeing was below average (4-5/10) and transparency was low (some
haze). No encke division visible. The globe bands
were washed out due to low signal to noise ratio. Two reasons: low transparency
& too high focal ratio (5X powermate). I shall
use the 4X powermate to achieve F27 and try in coming
morning.
The south equatorial belt is
vividly shown with reddish tone.
http://www.ort.cuhk.edu.hk/ericng/saturn-200310182046UT-eric.jpg
Feel
free to comment.
P.S. I shall post the Jupiter
shot later on. But very very bad quality as it was
captured when it is below 30 degree.
® . . . . . . .Date: Mon, 20 Oct 2003 00:27:01 +0800
Subject:
20031018 Jupiter - bad quality! :-)
Dear
friends,
Here was my first Jupiter image
of 2003-2004 apparition captured in this morning. Bad
quality, right?
Jupiter was around 25 degree
from horizon. Seeing and transparency were bad. However, on the image, you
still can see
Kind
Regards,
® . . . . . . .Date: Mon, 20 Oct 2003 00:36:02 +0800
Subject:
Re: 20031018 Jupiter - bad quality! :-)
oops,
sorry, here is the link:
http://www.ort.cuhk.edu.hk/ericng/Jup-2003010182130UT-eric.jpg
® . .
. . . . .Date: Sun, 19 Oct 2003 23:51:17 +0100
From: "Damian Peach"
<dpeach_78@yahoo.co.uk>
Subject: Re: 20031018 Jupiter - bad
quality! :-)
Hi Eric,
An excellent first image!.
>>Jupiter
was around 25 degree from horizon. Seeing and transparency were bad. However,
on the image, you still can see
Its now looking
very likely that a mid-SEB outbreak of white spots occured
during Solar conjunction (look at the Jupiter guide at my website to see more
info on this type of activity.)
The last such
mid-SEB outbreak occurred in 1998, and was a spectacular sight visually.
>>Some
festoon and projection are visible on EZ. BTW, a faint belt is visible to the
north of
This is not the
NTB, but the North Tropical Band. Compare with images from last apparition to
confirm the NTB latitude, and youll see its latitude
is notably further North.
Also you
captured Oval BA on the CM on your image (L2=213) and white spot Z/barge 1 on
the NEBn. Also note the vague white spot in the SSTB
directly south of BA.
A very
interesting first image ;-).
Best Wishes,
Damian
® . . . . . . .Date: Tue, 21 Oct 2003 12:38:38 +0800
Subject:
20031020 Jupiter
Dear
friends,
Attached was the Jupiter
captured in this morning. Very hazy sky! However I was quite satisfied with the
detail shown on this image as it was taken when Jupiter at 30 degree from
horizon.
http://www.ort.cuhk.edu.hk/ericng/jup-200310202158-eric.jpg
You can see very active
equatorial zone with projections, festoons connection. There is a dark patch
feature can be found on south tropical zone.
Wish
you like it.
® . .
. . . . Date: Tue, 21 Oct 2003 11:36:20 +0100 (BST)
From: "J.H. Rogers"
<jhr11@hermes.cam.ac.uk>
Subject: Re: 20031020 Jupiter
Dear Eric,
Thank you for
that beautiful image; it is certainly the best image yet of the mid-SEB
outbreak. The 'South tropical' dark spot actually appears to be in South
Temperate latitudes, similar to STB Dark Spot 1 in 1998 (which lasted until
2000). NEBn white spot Z is also well shown, on the f.side.
All best wishes,
John
® . . . . . . .Date: Wed, 22 Oct 2003 09:19:37 +0800
Subject:
Re: 20031020 Jupiter
Dear
John,
Thank you very much for your
kind description and pointed out my misinterpretation of the dark spot
location. I should be more careful next time. I have taken the Jupiter shot
again in this morning, I shall post it later on.
Cheers,
® . . . . . . .Date: Wed, 22 Oct 2003 12:43:08 +0800
Subject:
20032021 Saturn
Dear
friends,
Attached was the saturn image captured in this morning, seeing was around 5/10
and transparency was very low ... Encke division was
still not visible but you can see the very distinct dark "spot" like
south polar region.
http://www.ort.cuhk.edu.hk/ericng/sat-20031021-2045UT-eric.jpg
Kind
Regards,
® . . . . . . .Date: Wed, 22 Oct 2003 12:46:37 +0800
Subject:
20031021 Jupiter
Dear
friends,
Here was the Jupiter image
captured in this morning, seeing and transparency were
bad as it was still low on the sky.
http://www.ort.cuhk.edu.hk/ericng/jup-200310212204UT-eric.jpg
You can see the Io on the image
as well. Colour fringe surrounding Io was caused by atmospheric dispersion.
Cheers,
® . . . . . .
. Date: Thu, 23 Oct 2003 12:37:21 +0800
Subject:
20031021 Jupiter - I am really confused ...
Dear
friends,
I have just processed the Jupiter
image captured in this morning after read the message by Frank concerning about
the dark spot feature. Sorry that the
exact UT time is not available now as I forgot to get back my observing log
book. The should be around 22:10UT.
I checked the SKY software and
there was double transit occurred at that time. According to the software, the
bright spot at the preceding side was Io and the Ganymede should be near
central meridian above NEB ... However, I could not differentiate whether the
"dark spot" near the CM on my image was Ganymede itself or the dark
feature in NEB mentioned by Frank. I am really confused ... The dark
condensation on STemp region at following side could
be seen on this image too.
http://www.ort.cuhk.edu.hk/ericng/jup-2003102222xxUT-eric.jpg
May
the experienced observers and experts kindly commented
on it?
Seeing was really bad as
transparency was low as usual and the cloud formed on eastern sky near sunrise
this morning, I could only capture it through the cloud gap
...
Thanks
for your help
P.S.
I shall post the exact time to here once I check my log book.
® . .
. . . . .Date: Thu, 23 Oct 2003 01:39:23 EDT
From: FrankJ12@aol.com
Subject: Re: [ALPO_Jupiter]
20031021 Jupiter - I am really confused ...
Eric-
My local astronomy club (Astronomical
Society of Long Island) brought me this attention. The images of Jupiter Oct.
19th at 4:59 UT and 5:32 UT were taken by Olivier Meeckers
of
Like you said, I
would leave up to the experts.
Thanks Eric for a
spectacular image!
Frank J M
® . .
. . . . . Date: Thu, 23 Oct 2003 02:22:34 EDT
From: FrankJ12@aol.com
Subject: Updated: Re: [ALPO_Jupiter] 20031021 Jupiter - I am really confused ...
Eric and all -
That black spot you have imaged of Oct. 22nd
at 22:10 UT near CM is not a satellite's shadow. It is Ganymede itself!!! There is a big difference in albedo variations between the two satellites on the disk!!!
Wow!!!
If you look carefully by Io, you can see the
dark blue festoon. Perhaps, it is nearly the same location where this huge dark
feature that was spotted at Sys I longitude 284 degrees on Oct. 19th at 4:58 UT
which was imaged by Olivier Meeckers of
Frank J M
® . . . . . . .Date: Thu, 23 Oct 2003 18:35:45 +0800
Subject:
Re: Updated: Re: [ALPO_Jupiter] 20031021 Jupiter - I
am really confused ...
Thank you very much for the
prompt comment by Frank and Antonio Cidadao. wow. I really could not imagine that Ganymede could be so
dark on compare with Jupiter atmosphere. A good lesson!!!
Cheers,
® . . . . . .
. Date: Thu, 23 Oct 2003 18:37:16 +0800
Subject:
20031022 Saturn
Dear
friends,
Last night the seeing was
steadier but the transparency was terribly low ... Attached was the image
captured on 20031022 at 21:29UT, hope the transparency will improve tonight ...
Encke division was bearly
visible on this shot
http://www.ort.cuhk.edu.hk/ericng/saturn-200310222129UT-eric.jpg
Kind
Regards,
Eric NG (
