- 33 Polyhymnia
Infobox Planet | discovery=yes | physical_characteristics = yes | bgcolour=#FFFFC0
name=33 Polyhymnia
discoverer=J. Chacornac
discovered=October 28 ,1854
alt_names=A887 HA; 1938 FE; 1953 AK; 1957 YL; 1963 DG; mp|1976 YT|7
mp_category=Main belt
epoch=December 31 ,2006 (JD 2454100.5)
semimajor=428.585 Gm (2.865 AU)
perihelion=283.846 Gm (1.897 AU)
aphelion=573.325 Gm (3.832 AU)
eccentricity=0.338
period=1771.195 d (4.85 a)
inclination=1.871°
asc_node=8.590°
arg_peri=338.240°
mean_anomaly=148.947°
avg_speed=17.08 km/s
dimensions=50-120 km [ [http://cfa-www.harvard.edu/iau/lists/Sizes.html Conversion of Absolute Magnitude to Diameter ] ]
mass=1.3-18.0e|17 kg
density=2.0? g/cm³
surface_grav=0.014-0.033 m/s²
escape_velocity=0.026-0.063 km/s
rotation=0.77504 d (18.601 h) [ [http://www.psi.edu/pds/archive/lc.html] Dead link|date=March 2008]
spectral_type=S
abs_magnitude=8.55
albedo=0.10?
single_temperature=~164 K33 Polyhymnia (IPAEng|ˌpɒliˈhɪmniə) is a
main belt asteroid .It was discovered by J. Chacornac on
October 28 ,1854 and named afterPolyhymnia , the GreekMuse of sacredhymn s.References
Wikimedia Foundation. 2010.