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2011-Dec-18 00:00 0.06557130563679 -13.7708744 -0.36758
2011-Dec-19 00:00 0.05764056537943 -13.6900388 -1.25648
2011-Dec-20 00:00 0.04975801953204 -13.6027874 -2.42696
2011-Dec-21 00:00 0.04192999556562 -13.4987798 -4.03397
2011-Dec-22 00:00 0.03417190781705 -13.3548464 -6.37037
2011-Dec-23 00:00 0.02652131350735 -13.1104486 -10.05891
2011-Dec-24 00:00 0.01908114776717 -12.5685784 -16.66260
2011-Dec-25 00:00 0.01221028647675 -10.8499152 -31.10317
2011-Dec-26 00:00 0.00760919562476 -3.3423063 -69.73484
2011-Dec-27 00:00 0.00950203453553 8.5771040 -56.86656
2011-Dec-28 00:00 0.01568969164021 12.0099370 -33.96692
2011-Dec-29 00:00 0.02292729352425 12.8927871 -24.67052
2011-Dec-30 00:00 0.03048227714789 13.2277558 -19.88819
2011-Dec-31 00:00 0.03817492770316 13.3980630 -17.00686
2012-Jan-01 00:00 0.04594530607208 13.5061048 -15.08555
Ephemeris Type: OBSERVER
Target Body: Asteroid (2000 YA)
Observer Location: Geocentric 
Time Span: Start=2011-10-01, Stop=2012-01-01, Step=1 d
Table Settings: QUANTITIES=20,28
Display/Output: default (formatted HTML)
Originally posted by Illustronic
I'm not exactly sure how you got to what you are showing, (link would help), but I got a smooth progression here on the more accurate Horizons web interface.
When I hit the JPL close-approach data link by the orbital diagram we all know and love I got it's close approach parameters every approach, meaning one reading for the year of each close approach, but I clearly see the dates on your visual so you got me.
The plane angle is the angle between the observer (in this case, your settings make that the center of the Earth) and the plane of the object's orbit. At the point of closest approach to the Earth, the plane angle is going to be at a maximum (or minimum, depending on if the object approaches from above or below the Earth's orbital plane).
Originally posted by Wrabbit2000
By the way...I've been playing with the Orbit diagram to get the best view and it looks like this comes from slightly below Earth and passes to a position above us right around it's pass date. Unfortunately, that leaves me more confused, not less as to the number progression. Perhaps I'm just badly misunderstanding what "Orbital Plane" is on the horizons ephemeris displays..In which case I'm anxious to hear that as well, should that be the explanation. Oh well... Nothing ventured, nothing learned.
Originally posted by sabalsis1972
..check this coordinates RA 0h 03m 47.03s - DEC 5 40`53.57" on Google sky , there is a big red X ?!?!?!, the same as to the guy who put a video with the possible impact zone on earth!!!(with an big red X).....wtf is going on , who is playng with the google ????! , and why??