Sean R. Lynch wrote:
Sean R. Lynch wrote:
Donald Qualls wrote:
David Weinshenker wrote:
From arocket... -dw
Paul Breed wrote:
http://neo.jpl.nasa.gov/risk/
That's a very low velocity object with a small estimated diameter --
I wonder if it isn't another "lost" upper stage that's been in an
almost-congruent orbit for a long time and just now getting
synchronized again enough to come close. The white paint on those
rocket stages makes them look much, much larger than they are if you
have an assumption they're almost black like a chondrite asteroid.
I've started running the orbit backwards. I've found a close
encounter on April 15, 1998 so far. I'll keep going.
I should have mentioned that the 1998-04-15 encounter was 0.11 AU, not
all that close. Here are the other close encounters I've found:
0.11 AU (42.8 Rmoon) 1998-04-15 (Lunar Prospector 1998-01-07)
0.0585 AU (22.8 Rmoon) 1985-12-22 (Giotto 1985-07-02)
0.116 AU (45.1 Rmoon) 1975-04-15
0.185 AU (72.0 Rmoon) 1973-12-22 (Mariner 10 1973-10-03)
0.0731 AU (28.4 Rmoon) 1967-03-31 (Venera 4? When was that launched?)
0.113 AU (44.0 Rmoon) 1959-01-26 (Luna-1 1959-01-02)
Hmmm, it's not Venera 4. That was launched 1967-06-12.
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