847 Agnia

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847 Agnia
847Agnia (Lightcurve Inversion).png
A three-dimensional model of 847 Agnia based on its light curve.
Discovered by G. N. Neujmin
Discovery site Simeis
Discovery date September 2, 1915
1915 XX
Orbital characteristics
Epoch August 18, 2005 (JDCT 2453600.5)
Aphelion 3.045 AU
Perihelion 2.519 AU
2.782 AU
Eccentricity 0.095
4.640 a
Inclination 2.480°

847 Agnia is a minor planet orbiting the Sun. It is approximately 28 kilometers in diameter.[1]

The spectrum of this object indicates that it is an S-type asteroid with both low and high calcium forms of pyroxene on the surface, along with less than 20% olivine. The high-calcium form of pyroxene forms 40% or more of the total pyroxene present, indicating a history of igneous rock deposits. This suggests that the asteroid underwent differentiation by melting, creating a surface of basalt rock.[2]

847 Agnia is the namesake of the Agnia family of asteroids that share similar orbital elements and physical properties. The members of this family, including 847 Agnia, most likely formed from the breakup of a basalt object, which in turn was spawned from a larger parent body that had previously undergone igneous differentiation. Other members of this family include 1020 Arcadia, 1228 Scabiosa, 2401 Aehlita, and 3395 Jitka[2]

Photometric observations of this asteroid collected during 2004–2005 show a rotation period of 14.827 ± 0.001 hours with a brightness variation of 0.45 ± 0.03 magnitude.[3]


  1. ^ IOTA/IOTA-ES occultation update for (847) Agnia[dead link]
  2. ^ a b Sunshine, Jessica M.; et al. (August 2004), "High-calcium pyroxene as an indicator of igneous differentiation in asteroids and meteorites", Meteoritics & Planetary Science 39 (8), pp. 1343–1357, Bibcode:2004M&PS...39.1343S, doi:10.1111/j.1945-5100.2004.tb00950.x. 
  3. ^ Pray, Donald P. (September 2005), "Lightcurve analysis of asteroids 106, 752, 847, 1057, 1630, 1670, 1927 1936, 2426, 2612, 2647, 4087, 5635, 5692, and 6235", Bulletin of the Minor Planets Section of the Association of Lunar and Planetary Observers 32 (3): 48–51, Bibcode:2005MPBu...32...48P. 

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