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159 Aemilia Discovery Discovered by P. P. Henry Discovery date January 26, 1876 Designations Named after Via Aemilia Alternate name(s) 1904 OK, 1959 EG1 Minor planet category Main belt (Hygiea family) Orbital characteristics Epoch 26 November 2005 (JD 2453700.5) Aphelion 515.348 Gm (3.445 AU) Perihelion 412.241 Gm (2.756 AU) Semi-major axis 463.794 Gm (3.100 AU) Eccentricity 0.111 Orbital period 1993.879 d (5.46 a) Average orbital speed 16.86 km/s Mean anomaly 227.956° Inclination 6.128° Longitude of ascending node 134.336° Argument of perihelion 335.594° Physical characteristics Dimensions 125 km[1] Mass ~1.4×1018 kg (estimate) Mean density ~1.4 g/cm³ (estimate)[4] Equatorial surface gravity ~0.024 m/s² (estimate) Escape velocity ~0.055 km/s (estimate) Rotation period ~1.05 d [2] Albedo 0.0639 [1] Temperature ~160 K max: 239K (-34° C) Spectral type C Absolute magnitude (H) 8.12 159 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 probably 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.[3] References Supplemental IRAS Minor Planet Survey PDS lightcurve data PDS occultation data G. A. Krasinsky et al. Hidden Mass in the Asteroid Belt, Icarus, Vol. 158, p. 98 (2002). v • d • e Minor planets navigator 158 Koronis       ·       159 Aemilia       ·       160 Una v • d • e Small Solar System bodies Asteroids (Centaurs · Damocloids · Families · Groups · Moons · Jupiter trojans · Main belt · Near-Earth · Neptune trojans · Spectral types) · Comets · Meteoroids · Minor planets · Trans-Neptunians (Detached objects · Hills cloud · Kuiper belt · Oort cloud · Scattered disc objects) Lists: Asteroid groups and families · Asteroid moons · Binary asteroids · Minor planets See also: List of minor planets, Meanings of minor planet names, Pronunciation of asteroid names, and Solar System This article about a C-type asteroid native to the main belt is a stub. You can help Wikipedia by expanding it. v • d • e