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.png) A three-dimensional model of 578 Happelia based on its light curve | |
| Discovery | |
|---|---|
| Discovered by | M. F. Wolf |
| Discovery site | Heidelberg |
| Discovery date | 1 November 1905 |
| Designations | |
| MPC designation | (578) Happelia |
| Alternative designations | 1905 RZ |
| Orbital characteristics | |
| Epoch 31 July 2016 (JD 2457600.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 110.46 yr (40344 d) |
| Aphelion | 3.2821 AU (491.00 Gm) |
| Perihelion | 2.2168 AU (331.63 Gm) |
| Semi-major axis | 2.7494 AU (411.30 Gm) |
| Eccentricity | 0.19374 |
| Orbital period (sidereal) | 4.56 yr (1665.2 d) |
| Mean anomaly | 200.53° |
| Mean motion | 0° 12 58.284 / day |
| Inclination | 6.1525° |
| Longitude of ascending node | 29.411° |
| Argument of perihelion | 261.400° |
| Physical characteristics | |
| Mean radius | 34.645±1.05 km |
| Synodic rotation period | 10.061 h (0.4192 d) |
| Geometric albedo | 0.0769±0.005 |
| Absolute magnitude (H) | 9.4 |
578 Happelia is a minor planet orbiting the Sun. On 24 February 2017 a possible small 3-kilometer moon was found orbiting the asteroid, based on occultation observations.
References
- "578 Happelia (1905 RZ)". JPL Small-Body Database. NASA/Jet Propulsion Laboratory. Archived from the original on 18 September 2020. Retrieved 5 May 2016.
- "(578) Happelia occultation 2017/02/24". www.asteroidoccultation.com. Archived from the original on 12 March 2017. Retrieved 12 March 2017.
External links
- Lightcurve plot of 578 Happelia, Palmer Divide Observatory, B. D. Warner (2008)
- Lightcurves 578 Happelia, tripod.com
- Asteroid Lightcurve Database (LCDB), query form (info Archived 16 December 2017 at the Wayback Machine)
- Dictionary of Minor Planet Names, Google books
- Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend
- Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center
- 578 Happelia at AstDyS-2, Asteroids—Dynamic Site
- 578 Happelia at the JPL Small-Body Database
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