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
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: ???