113390 Helvetia
| Discovery [1] | |
|---|---|
| Discovered by | M. Griesser |
| Discovery site | Eschenberg Obs. |
| Discovery date | 29 September 2002 |
| Designations | |
| MPC designation | 113390 Helvetia |
Named after |
Helvetia (national personification)[2] |
| 2002 SU19 · 2001 FS166 | |
| main-belt [1][2] | |
| Orbital characteristics [1] | |
| Epoch 16 February 2017 (JD 2457800.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 56.12 yr (20,497 days) |
| Aphelion | 2.7703 AU |
| Perihelion | 1.8356 AU |
| 2.3029 AU | |
| Eccentricity | 0.2029 |
| 3.49 yr (1,276 days) | |
| 88.215° | |
| 0° 16m 55.2s / day | |
| Inclination | 7.3574° |
| 298.49° | |
| 8.8044° | |
| Physical characteristics | |
| Dimensions |
2.196±0.360[3] 3±1 km (calculated)[4] |
| 0.231±0.103[3] | |
| 15.6[1] | |
|
| |
113390 Helvetia, provisional designation 2002 SU19, is an asteroid from the inner regions of the asteroid belt, approximately 2.2 kilometers in diameter. It was discovered on 29 September 2002, by Swiss astronomer Markus Griesser at the Eschenberg Observatory in Winterthur, near Zürich, Switzerland.[2]
The asteroid orbits the Sun at a distance of 1.8–2.8 AU once every 3 years and 6 months (1,276 days). Its orbit has an eccentricity of 0.20 and an inclination of 7° with respect to the ecliptic.[1] The first precovery was taken at Palomar Observatory in 1960, extending the asteroid's observation arc by 42 years prior to its discovery.[2] As of 2016, the asteroid's shape, composition and rotation period remain unknown.
Based on its absolute magnitude of 15.6, its diameter lies between 2 and 4 kilometers, assuming an albedo in the range of 0.05 to 0.25.[4] According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, the asteroid measures 2.2 kilometers in diameter and its surface has an albedo of 0.231, which is typical for stony asteroids.[3]
The minor planet was named in February 2006 and bears the name for Switzerland (Latin: Confoederatio Helvetica), where the asteroid was discovered. Helvetia is also an allegorical figure and symbol for the nation. Each Swiss stamp carries her name, and her figure appears on most Swiss coins.[2] Naming citation was published on 19 February 2006 (M.P.C. 55989).[5]
References
- 1 2 3 4 5 "JPL Small-Body Database Browser: 113390 Helvetia (2002 SU19)" (2016-11-06 last obs.). Jet Propulsion Laboratory. Retrieved 2 December 2016.
- 1 2 3 4 5 "113390 Helvetia (2002 SU19)". Minor Planet Center. Retrieved 15 November 2016.
- 1 2 3 Masiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; Dailey, J.; et al. (November 2011). "Main Belt Asteroids with WISE/NEOWISE. I. Preliminary Albedos and Diameters". The Astrophysical Journal. 741 (2): 20. arXiv:1109.4096
. Bibcode:2011ApJ...741...68M. doi:10.1088/0004-637X/741/2/68. Retrieved 15 November 2016. - 1 2 "Absolute Magnitude (H)". NASA/JPL. Retrieved 15 November 2016.
- ↑ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 15 November 2016.
External links
- Eschenberg Observatory – website
- "Helvetia" - the First Swiss Astronaut (German)
- Asteroid Lightcurve Database (LCDB), query form (info)
- Dictionary of Minor Planet Names, Google books
- Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend
- 113390 Helvetia at the JPL Small-Body Database
