| Discovery | |
|---|---|
| Discovered by | Max Wolf |
| Discovery site | Heidelberg Observatory |
| Discovery date | 10 January 1904 |
| Designations | |
| (522) Helga | |
| Pronunciation | German:[ˈhɛlɡaː][1] |
| 1904 NC | |
| Orbital characteristics[2] | |
| 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 |
| 6.92yr (2529.1d) | |
| 200.06° | |
| 0° 8m 32.424s / day | |
| Inclination | 4.4174° |
| 116.683° | |
| 246.503° | |
| Physical characteristics | |
| 50.61±1.75km | |
| 8.129 h (0.3387 d) | |
| 0.0388±0.003 | |
| 9.0 | |
522 Helga, provisional designation1904 NC is a largemain beltasteroid (minor planet). It was discovered in1904 byMax Wolf inHeidelberg. Helga is notable for being the first such object to be shown to be in a stable butchaotic orbit in a 7:12resonance withJupiter, itsLyapunov time being relatively short, at 6,900 yr. Despite this, its orbit appears to be stable, as theeccentricity andprecession rates are such that it avoids close encounters with Jupiter.[3] It forms part of theCybele asteroid group.[4]
522 Helga was "named by Lt. Th. Lassen, orbit computer" according toPaul Herget'sThe Names of the Minor Planets[5] (note thatcomputer does not refer to apersonal computer, i.e. a machine, but rather to a person actually doing the necessary calculations).
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