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Alcyone Ephemeris Small Body Data Files

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Asteroid 121 Hermione


Named after Hermione, daughter of Menelaus and Helen in Greek mythology.

This file is not available for download, but provided by the Alcyone Ephemeris Small Body Data File DVD.

ClassificationMain-belt Asteroid
FamilyCybelian asteroids

Osculating Orbital Elements
Epoch2451630,5
Semi major axis3,4412 AU
Period [Julian yrs]6,384 Julian years
Inclination7,581 °
Eccentricity0,1460
Lon. of ascending node73,526 °
Argument of perihelion294,424 °
Passage of perihelion2002-Jul-24.468319
Aphelion distance3,9437 AU
Mean anomaly228,845 °

Physical Data
Radius104,50 km
Rotation period5,551 days
Absolute magnitude (H)7,0575
Magnitude Slope (G)0,15
Color index (B-V)0,739
Geometric albedo0,0482
Spectral classCh

Discovery Circumstances
DiscovererJames Craig Watson
Discovered1872-05-12

Data File
Data File Name121_Hermione.aed
Data File Date2006-12-22
Data File Size2714 kB
Covered Period1800,00 - 2100,00