2003 XH10 (Apollo making close approach)
2003 XH10 was discovered by LINEAR on 2003 Dec 4th and
posted on the NEO Confirmation Page later that day, but it had still not
been confirmed by the next evening. By this time the uncertainty area
was an ellipse about 14° x 2° in size and the asteroid predicted to be
17th magnitude, moving at about 30"/minute.
A search was started at Great Shefford and had covered about 3 square
degrees by midnight, when the NEOCP ephemeris was updated because a
second night of positions had been received by the MPC from LINEAR. The
search at Great Shefford had not recorded the object, having reached
about half way from the nominal ephemeris position to the actual place
where the asteroid was.
2003 XH10 had approached to within 7 lunar distances on
2003 Dec 04 and was fading as it receded from Earth during the next few
days, just as the Moon was reaching full. At the time of writing (13th
Dec) the object was last recorded by Powell Observatory (649) 4 days
after discovery, on 2003 Dec 8th.