159 Aemilia

Aemilia (minor planet designation: 159 Aemilia) is a large main-belt asteroid. Aemilia was discovered by the French 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.

159 Aemilia
Discovery
Discovered byP. P. Henry
Discovery date26 January 1876
Designations
(159) Aemilia
Pronunciation/ɪˈmɪliə/[1]
Named after
Via Aemilia
1959 EG1
Main belt (Hygiea family)
AdjectivesAemilian /ɪˈmɪliən/[2]
Orbital characteristics[3]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc112.24 yr (40996 d)
Aphelion3.4377 AU (514.27 Gm)
Perihelion2.76896 AU (414.231 Gm)
3.1033 AU (464.25 Gm)
Eccentricity0.10775
5.47 yr (1996.8 d)
16.86 km/s
214.036°
0° 10m 49.008s / day
Inclination6.1308°
134.132°
333.387°
Earth MOID1.78581 AU (267.153 Gm)
Jupiter MOID1.67782 AU (250.998 Gm)
TJupiter3.203
Physical characteristics
Dimensions124.97±2.4 km[3]
127.3 km[4]
Mass~1.4×1018 kg
Mean density
~1.4 g/cm³[5]
Equatorial surface gravity
~0.024 m/s²
Equatorial escape velocity
~0.055 km/s
24.476 h (1.0198 d)[3]
~1.05 d [6]
0.0639±0.003[3]
0.0627 ± 0.0142[4]
Temperature~160 K
max: 239K (-34° C)
C[4] (Tholen)
8.12,[3] 8.10[4]

    This slowly rotating, dark asteroid has a primitive carbonaceous composition, based upon its classification as a C-type asteroid.[4] Photometric observations made in 2006 gave a rotation period of about 25 hours. Subsequent observations made at the Oakley Observatory in Terre Haute, Indiana found a light curve period of 16.37 ± 0.02 hours, with variation in brightness of 0.24 ± 0.04 in magnitude.[7]

    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 probably produced that family. Three stellar occultations by Aemilia have been recorded so far, the first in 2001, the second in 2003 and the third in 2016 [8]

    References
    1. Noah Webster (1884) A Practical Dictionary of the English Language
    2. "Emilian, Æmilian". Oxford English Dictionary (3rd ed.). Oxford University Press. September 2005. (Subscription or UK public library membership required.)
    3. Yeomans, Donald K., "159 Aemilia", JPL Small-Body Database Browser, NASA Jet Propulsion Laboratory, retrieved 12 May 2016.
    4. Pravec, P.; et al. (May 2012), "Absolute Magnitudes of Asteroids and a Revision of Asteroid Albedo Estimates from WISE Thermal Observations", Asteroids, Comets, Meteors 2012, Proceedings of the conference held May 16–20, 2012 in Niigata, Japan (1667), Bibcode:2012LPICo1667.6089P. See Table 4.
    5. Krasinsky, G. A.; et al. (July 2002), "Hidden Mass in the Asteroid Belt", Icarus, 158 (1), pp. 98–105, Bibcode:2002Icar..158...98K, doi:10.1006/icar.2002.6837.
    7. Ditteon, Richard; Hawkins, Scot (September 2007), "Asteroid Lightcurve Analysis at the Oakley Observatory - October-November 2006", The Minor Planet Bulletin, 34 (3), pp. 59–64, Bibcode:2007MPBu...34...59D.
    8. 2016/09/01 | 159 | Aemilia | TYC 6349-00855-1


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