71000 Hughdowns

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71000 Hughdowns
Discovery A
Discoverer Charles W. Juels
Discovery date December 7, 1999
Alternate
designations B		 1999 XD37
Category Main belt
Orbital elements C
Epoch November 26, 2005 (JD 2453700.5)
Eccentricity (e) 0.185
Semi-major axis (a) 399.430 Gm (2.670 AU)
Perihelion (q) 325.645 Gm (2.177 AU)
Aphelion (Q) 473.216 Gm (3.163 AU)
Orbital period (P) 1593.572 d (4.36 a)
Mean orbital speed 18.07 km/s
Inclination (i) 13.003°
Longitude of the
ascending node (Ω)		 93.496°
Argument of
perihelion (ω)		 322.502°
Mean anomaly (M) 138.415°
Physical characteristics D
Dimensions  ? km
Mass  ?×10? kg
Density  ? g/cm³
Surface gravity  ? m/s²
Escape velocity  ? km/s
Rotation period  ? d
Spectral class  ?
Absolute magnitude 14.2
Albedo (geometric) 0.1?
Mean surface
temperature		 ~170 K
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The asteroid 71000 Hughdowns, provisional designation 1999 XD37, is named after American television host Hugh Downs, popular for his co-hosting career on the ABC news show 20/20. It was discovered on December 7, 1999 by Charles W. Juels.

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