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801 Helwerthia 
Summary
801 Helwerthia is a C-type asteroid orbiting in the Main belt near the Eunomia family. However, it is not a family member but an un-related interloper in the region because its composition is inconsistent with membership. Its diameter is about 33 km, its albedo around 0.038.[2] An international team of astronomers observed this minor planet photometrically in 2012, determining a rotation period of 23.93±0.01 h with an amplitude of 0.15±0.03 in magnitude.[3]
| Discovery | |
|---|---|
| Discovered by | Max Wolf |
| Discovery site | Heidelberg Observatory |
| Discovery date | 20 March 1915 |
| Designations | |
| (801) Helwerthia | |
| 1915 WQ; A924 OD; 1925 RG; 1970 GS1 | |
| Orbital characteristics[1] | |
| Epoch 31 July 2016 (JD 2457600.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 101.08 yr (36918 d) |
| Aphelion | 2.8087 AU (420.18 Gm) |
| Perihelion | 2.4007 AU (359.14 Gm) |
| 2.6047 AU (389.66 Gm) | |
| Eccentricity | 0.078337 |
| 4.20 yr (1535.4 d) | |
| 47.6362° | |
| 0° 14m 4.056s / day | |
| Inclination | 14.130° |
| 185.973° | |
| 335.076° | |
| Earth MOID | 1.41172 AU (211.190 Gm) |
| Jupiter MOID | 2.17333 AU (325.126 Gm) |
| TJupiter | 3.366 |
| Physical characteristics | |
Mean radius | 16.615±1.25 km |
| 23.93 h (0.997 d) | |
| 0.0384±0.007 | |
| 11.55 | |
References edit
- ^ "801 Helwerthia (1915 WQ)". JPL Small-Body Database. NASA/Jet Propulsion Laboratory. Retrieved 6 May 2016.
- ^ "Supplemental IRAS Minor Planet Survey". Archived from the original on 23 June 2006.
- ^ Pilcher, Frederick; et al. (October 2012), "Rotation Period Determination for 801 Helwerthia", The Minor Planet Bulletin, 39 (4): 222–225, Bibcode:2012MPBu...39..222P
External links edit
- 801 Helwerthia at AstDyS-2, Asteroids—Dynamic Site
- Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
- 801 Helwerthia at the JPL Small-Body Database
