522 Helga

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522 Helga
Discovered by Max Wolf
Discovery site Heidelberg
Discovery date 10 January 1904
MPC designation (522) Helga
1904 NC
Orbital characteristics[1]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc 114.65 yr (41876 d)
Aphelion 3.9372 AU (589.00 Gm)
Perihelion 3.3284 AU (497.92 Gm)
3.6328 AU (543.46 Gm)
Eccentricity 0.083794
6.92 yr (2529.1 d)
0° 8m 32.424s / day
Inclination 4.4174°
Earth MOID 2.32811 AU (348.280 Gm)
Jupiter MOID 1.50115 AU (224.569 Gm)
Jupiter Tisserand parameter 3.093
Physical characteristics
Mean radius
50.61±1.75 km
8.129 h (0.3387 d)

522 Helga (also known as 1904 NC) is an asteroid (minor planet) orbiting the Sun discovered in 1904 by Max Wolf in Heidelberg. Helga is notable for being the first such object to be shown to be in a stable but chaotic orbit in resonance with Jupiter, its Lyapunov time being relatively short, at 6,900 yr. Despite this, its orbit appears to be stable, as the eccentricity and precession rates are such that it avoids close encounters with Jupiter.[2]

522 Helga was "named by Lt. Th. Lassen, orbit computer" according to Paul Herget's The Names of the Minor Planets[3] (note that computer does not refer to a personal computer, i.e. a machine, but rather to a person actually doing the necessary calculations).


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