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QUESTIONS: Comet 209P/LINEAR
many different sources | Feb 27, 2014 | Yosemitest

Posted on 02/27/2014 5:19:00 PM PST by Yosemitest

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To: Yosemitest

Starry Night Pro is what I use to visualize the positions of various comets and asteroids from the perspective of the stereo spacecraft. It’s handy for a variety of reasons, it’s also easier to work with than Celestia, which is what I previously used in years past. Again, it can’t numerically integrate orbits over time, so it’s only used to compare the positions at orbital element epochs close to the time observation. ORSA can integrate those orbits over time and then the results be fed back into Starry Night if necessary, however.


101 posted on 03/12/2014 8:24:56 AM PDT by messierhunter
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To: Yosemitest
One more thing, BPearthwatch is still misidentifying Lovejoy as 209P. He has watched my video, but has decided to continue spreading misinformation. I responded to it here, but without directly showing his video itself so as to not draw a DMCA takedown request.

https://www.youtube.com/watch?v=QOm0q7wZiUk
102 posted on 03/12/2014 8:27:25 AM PDT by messierhunter
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To: messierhunter
Thanks fore the info.
It was well presented.
I have other thoughts, but I'm recovering from a left hand injury and I'll have to state them later.
Thanks again for your time.
103 posted on 03/14/2014 1:27:20 AM PDT by Yosemitest (It's Simple ! Fight, ... or Die !)
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To: Yosemitest
Recently, there is no new information? About 209P/LINEAR。 http://interesting-sky.loveno.net/meteor-shower/209p-ids2014/
104 posted on 04/20/2014 2:42:39 AM PDT by lingduxingxi
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To: Yosemitest
The new comet 209P/LINEAR of Afρ=?
105 posted on 04/20/2014 7:27:08 PM PDT by lingduxingxi
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To: lingduxingxi

I haven’t seen any new information, and I’ve been looking.


106 posted on 04/22/2014 9:37:44 PM PDT by Yosemitest (It's Simple ! Fight, ... or Die !)
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To: messierhunter; lingduxingxi
Messierhunter, have you any new information about comet 209P/Linear?

This is all I've seen:
Lingduxingxi, you might want to watch that video.
107 posted on 04/23/2014 9:58:46 PM PDT by Yosemitest (It's Simple ! Fight, ... or Die !)
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To: Yosemitest

It’s still just a small comet which may give us a nice meteor shower. Your video is just more fear mongering. “The debris will be all sizes.” No, it will be small, not a “danger to earth.” The comet will miss earth by some 8 million kilometers, even if it fragments. We have 34 days until the comet reaches perigee. The separation velocities of comets that fragment are only in the tens of meters per second at best.
“Separation velocities.
The relative speed of the
fragments shortly after the fragmentation event amounts
from 0.1 to 15 m/s with the majority between 0.3 and 4 m/s.”
http://www.lpi.usra.edu/books/CometsII/7011.pdf
Taking the high end of that range, if the comet fragment right this moment at 15m/s separation velocity it would only be able to spread out to a radius of about 44,000 km, orders of magnitude smaller than the 8 million kilometer distance it will have next month.


108 posted on 04/25/2014 11:47:05 AM PDT by messierhunter
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