522 Helga
| Discovery | |
|---|---|
| Discovered by | Max Wolf |
| Discovery site | Heidelberg |
| Discovery date | 10 January 1904 |
| Designations | |
| 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) | |
| 200.06° | |
| 0° 8m 32.424s / day | |
| Inclination | 4.4174° |
| 116.683° | |
| 246.503° | |
| 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) | |
| 0.0388±0.003 | |
| 9.0 | |
|
| |
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).
References
External links
- 522 Helga at the JPL Small-Body Database
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