What is Known about Asteroid 99942 Apophis?
Physical Properties
| Property | Value | Reference1 |
|---|---|---|
| Effective Diameter | 0.34 km 0.38-0.39 |
(Brozovic et al. Icarus 300, 115-128, 2018) (Licandro et al. A&A 585, A10, 2016) |
| Axial Ratio | ~2:1 | (Brozovic et al Icarus 300, 115-128, 2018) |
| Spectral Type | Sq | (Binzel et al. 2009, Icarus 200, 480-485) |
| Colors | ||
| H G |
19.7 0.25 |
|
| Rotation Period | 30.4 h | |
| Albedo | 0.23 | |
| Radar Properties | 0.25 ±0.11 (Goldstone) 0.18 ±0.08 (Arecibo) |
(Brozovic et al Icarus 300, 115-128, 2018) |
| Shape Model |
|
|
| Lightcurves | NPA rotation Pφ=27.38±0.07 h, Pψ=263±6 h |
(Pravec et al., Icarus 233, 48, 2014) |
1Unpublished references are for informational purposes only. Contact the authors before citing or reporting on the results they contain.
- References
Comments
Lightcurve Observations: ???
Support for Radar Observations: ???
Radar Observations: ???