817 Annika
| Discovery | |
|---|---|
| Discovered by | Max Wolf |
| Discovery date | 6 February 1916 |
| Designations | |
| 1916 YW | |
| Main belt (Eunomia family) | |
| Orbital characteristics[1] | |
| Epoch 31 July 2016 (JD 2457600.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 100.19 yr (36596 d) |
| Aphelion | 3.0538 AU (456.84 Gm) |
| Perihelion | 2.1292 AU (318.52 Gm) |
| 2.5915 AU (387.68 Gm) | |
| Eccentricity | 0.17840 |
| 4.17 yr (1523.8 d) | |
Average orbital speed | 18.36 km/s |
| 90.5151° | |
| 0° 14m 10.5s / day | |
| Inclination | 11.336° |
| 125.626° | |
| 284.728° | |
| Earth MOID | 1.17168 AU (175.281 Gm) |
| Jupiter MOID | 2.38185 AU (356.320 Gm) |
| Jupiter Tisserand parameter | 3.370 |
| Physical characteristics | |
Mean radius | 11.025±0.85 km,[1] 11 km[2] |
| Mass | ~1.5×1016 kg (estimate) |
Mean density | ~2.7 g/cm³ (estimate)[3] |
Equatorial surface gravity | ~0.008 m/s² (estimate) |
Equatorial escape velocity | ~0.013 km/s (estimate) |
| 0.440 d,[4] 10.56 h (0.440 d)[1] | |
| 0.1740±0.030 | |
| Temperature |
~169 K max: 264K (-9° C) |
| S-type asteroid | |
| 10.6 | |
|
| |
817 Annika is a mid-sized Eunomian asteroid.
References
- 1 2 3 "817 Annika (1916 YW)". JPL Small-Body Database. NASA/Jet Propulsion Laboratory. Retrieved 4 May 2016.
- ↑ "Supplemental IRAS Minor Planet Survey". Archived from the original on 2006-06-23.
- ↑ G. A. Krasinsky; et al. (2002). "Hidden Mass in the Asteroid Belt". Icarus. 158: 98. doi:10.1006/icar.2002.6837.
- ↑ "PDS lightcurve data". Archived from the original on 2006-06-14.
External links
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