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Asteroid Comet Impact Hazards - Florida International University

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<strong>Asteroid</strong> 1997 XF11 (Earth Close-Approach)<br />

Epoch = 1998 Mar 30.0 TDB<br />

e = 0.48374055<br />

q = 0.74443182 AU<br />

Tp = 1997-Jul-01.191519 TDB<br />

Node = 214.12725759 deg (J2000)<br />

w = 102.47227749 deg (J2000)<br />

i = 4.09477290 deg (J2000)<br />

a = 1.441752196 AU<br />

M = 154.75017350 deg<br />

Solution excluding pre-discovery observations<br />

● Error ellipse is much longer because the observational time span is much shorter (3 months<br />

versus 8 years).<br />

● Most likely miss distance is 86,000 km (54,000 mi).<br />

● Minimum miss distance is 28,000 km (17,000 mi).<br />

● Probability of Earth impact is zero.<br />

http://ssd.jpl.nasa.gov/ca_97xf11.html (5 of 9)12/5/2005 4:29:17 PM

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