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CoKu Tau 4 Sedna Pluto < 1770 km 86 AU 10,000 -240 o C~2300 km~30-50 AU248 ~ -180 o CC/2001 Q4 10 8 kmLELISSLT 10 6 kmLOTTAOS 10 kmLULIN OBSERVATORY2004/05/12 12:30 (UT)C/2001Q4 ST-8E CCD+SIGMA 300mm 60 s

Ulysses encountersComet Hyakutake • Comet Biela 1826 6.8 • 1846 1852 2• …• 1872è

Near –Earth Asteroid Tracking(NEAT)Space Guard in Japan• 1.2Lincoln Near Earth AsteroidResearch (LINEAR)Space Watch (USA, Arizona) C/2002 C1C= APA=Jan 1/2B=Jan 2/2Comet Ikeya-ZhangNEAT)+ o 1P/Halley; 2P/Encke; Comet Hale-Bopp=C/1995 O1

C/2001 Q4 (NEAT)C/2001 Q4By HC Lin 2004-05-10ST-8E CCD+SIGMA300mm F2.8->F4R-band 60sec6 +MaxIm-DLDigital DevelopmentprocessingBy HC Lin at Lulin Observatory, 2004-05-07By ZY Lin with LOT+PI 1300B R-band 10 s, 2004-05-04• • • • • • • Deep Impact, Rosetta