159 Aemilia

159 Aemilia

Infobox Planet | discovery=yes | physical_characteristics = yes | bgcolour=#FFFFC0 | name=159 Aemilia
discoverer=P. P. Henry
discovered=January 26, 1876
alt_names=1904 OK, mp|1959 EG|1
mp_category=Main belt (Hygiea family)
epoch=26 November, 2005 (JD 2453700.5)
semimajor=463.794 Gm (3.100 AU)
perihelion=412.241 Gm (2.756 AU)
aphelion=515.348 Gm (3.445 AU)
eccentricity=0.111
period=1993.879 d (5.46 a)
inclination=6.128°
asc_node=134.336°
arg_peri=335.594°
mean_anomaly=227.956°
avg_speed=16.86 km/s
dimensions=125 km [http://www.psi.edu/pds/asteroid/IRAS_A_FPA_3_RDR_IMPS_V6_0/data/diamalb.tab]
mass=~1.4×1018 kg "(estimate)"
density=~1.4 g/cm³ "(estimate)" [#Krasinsky02| [4]
surface_grav=~0.024 m/s² "(estimate)"
escape_velocity=~0.055 km/s "(estimate)"
rotation=~1.05 d [http://www.psi.edu/pds/archive/lc.html]
spectral_type=C
abs_magnitude=8.12
albedo=0.0639 [#IRAS| [1]
single_temperature=~160 K
"max:" 239K (-34° C)

159 Aemilia is a large Main belt asteroid. This slowly rotating, dark asteroid has a primitive carbonaceous composition.

It orbits within the Hygiea family, although it may be an unrelated interloping asteroid, as it is too big to have arisen from the cratering process that most likely produced that family.

Aemilia was discovered by the brothers Paul Henry and Prosper Henry on January 26, 1876. The credit for this discovery was given to Paul. It is probably named after the Via Aemilia, a Roman road in Italy that runs from Piacenza to Rimini.

Two stellar occultations by Aemilia have been recorded so far, the first in 2001 and the second in 2003 [http://www.psi.edu/pds/resource/occ.html] .

References

#

[http://www.psi.edu/pds/archive/astdata04/simps04/diamalb.tab Supplemental IRAS Minor Planet Survey]

# [http://www.psi.edu/pds/archive/lc.html PDS lightcurve data]
# [http://www.psi.edu/pds/resource/occ.html PDS occultation data]
#
G. A. Krasinsky et al "Hidden Mass in the Asteroid Belt", Icarus, Vol. 158, p. 98 (2002).

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