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New trajectory for ISON. NASA updated yesterday...! (Update for Oct. 15th)
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[quote:Dr. Astro:MV8yMzg0MDU2XzQwODA2NTUwXzk1RTIzRUM2] [quote:Rogue Lemming:MV8yMzg0MDU2XzQ5QUZDRTIz] [b][color=green]It will actually be further from earth when it flys by now[/color][/b] [/quote] Ugh! Don't use the stupid java applet to guess the close approach distance. It just uses 2-body methods to approximate the orbit. The exact figures are given in the close approach data table on the same page! 2013-Dec-26 22:42 Earth 0.429235146543569 AU (nominal distance) Vs my own previously calculated orbit for ISON: 26.935933 0.42918 AU http://dropcanvas.com/uw06n So in other words, even my old solution is within about 0.000055 AU or 8000 km of NASA's latest calculation, even though I specifically excluded all observations from September or later. [/quote]
Original Message
Yesterdays Info:
# obs. used (total) 5131
data-arc span 745 days (2.04 yr)
first obs. used 2011-09-30
last obs. used 2013-10-14
planetary ephem. DE431
SB-pert. ephem. SB431-BIG16
fit RMS .65678
data source ORB
producer Otto Matic
solution date 2013-Oct-14 17:14:05
Today's info:
Orbit Determination Parameters
# obs. used (total) 5152
data-arc span 746 days (2.04 yr)
first obs. used 2011-09-30
last obs. used 2013-10-15
planetary ephem. DE431
SB-pert. ephem. SB431-BIG16
fit RMS .6617
data source ORB
producer Otto Matic
solution date 2013-Oct-15 11:12:07
It will actually be further from earth when it flys by now
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