From
Eric
NG
© . . . . . . . Also I have upload my
first Mars image for this apparition in the image too.
http://www.ort.cuhk.edu.hk/ericng/webcam/mars.htm
Kind Regards,
(
© . . . . . . .Sent:
Subject: Re: CMO #270 updated
Dear Masami, That is my pleasure to
contribute my images to CMO group. I will keep sending you the Mars shots in
coming few months. Kind Regards,
© . . . . . . .Sent:
Subject: 20030427
Mars this morning
Woke up a bit earlier this
morning for Mars. Seeing was bad and I had
to manual select the 135 out of 800 frames for stacking. I am quite satisfied
for the result under such turbulent seeing. I tried 1/25 sec, 0% gain but all
details washed out so I switched to use 1/33 sec, 30% gain which gave better
raw detail.
© . . . . . . .Date:
Dear Minami and KC, Have you recieved my
April 27 Mars as I did not see it in CMO homepage. KC just forwarded the email
you mentioned about the issue of poor sensitivity of B channel in ToUcam…..
In recent years, the
atmospheric transparency is very low in
One of our friend Mr. Chan Tin Ping kindly modified the cooled version
of ToUcam for us. From my experience in Jupiter imaging, it dramatically reduce the noise level of B frame. I believe this can
definitely increase the S/N of B frame that gives better details on it.
Although we have some
experience in Jupiter imaging with ToUcam, I believe for Mars that is another
story. We shall keep testing and experiencing, I am better results can be
obtained. Cheers
(
© . . . . . . .Subject:
Transit of Mercury - Internet webcast by HKAS
The Hong Kong Astronomical
Society will arrange the internet webcast for the
event of Mecury Transit on
(5 May 2003 email)
© . . . . . . .Date:
Dear Minami, Thank you for your mail. Yes. I also discussed with Weileong for the issue of B tail into G that contaminates
the B frame, which leading the surface detail appear on a "real" B
frame. Seems the magenta filter would be good to cut out the G to get the
corrected "B". However, the noise would be another consideration ...
And also what we get would be the R(G)B shot.
To me ... B frame is the
most interesting layer as the atmospheric details on it are more dynamic. In
fact, Weileong and I will do some test for it. If
finally the B frame by ToUcam Pro still not good, I may go for the ST-5C and
guarantee to have good B by extending the exposure of it. Of course LRGB would
be my approach.
Hope the sky can be clear
and we can do some research on it.
Minami, I decided to move
to my rural observing site in August for 1.5 month and hopefully I can get some
better shot with my coming 12.5" and the 25" dobsonian.
© . . . . . . .Date:
Subject: Re:
Dear Minami, We will certainly keep track with mars if the sky is
clear. I am attaching the Mars I took in this morning. The seeing was ok and
some atmospheric dispersion on the image. I am pretty pleased with the surface
detail for this shot. I don’t think there is any visible dust storm from my
image but I do some cloud detail near the Tharsis. Please kindly comment,
© . . . . . . .Date:
Dear Minami, The sky is cloudy recently and it will be clear on
Tuesday, hope I still can keep track with the dust storm. I am reprocessed the
20030222 Mars and it looks better and less artifacts. Please kindly comment.
Kind Regards,
Eric NG (
