## Yarkovsky effects - special cases

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On this page you can find interesting graphs, comparsions and features of Yarkovksy effects,
which were not covered by previous graphs.

The effect of **nonzero albedo** and nonunity emissivity is clearly visible in these comparsion graphs
d*a*/d*t*. The yellow line is plotted for **albedo = 0.2, infrared emissivity 0.9**.
The drift rates are approximately 50 % smaller if you compare them with drift rates for albedo = 0.0 and
emissivity 0.9.

**High eccentricity** (in this simulation *e* = 0.9) can cause a very important increase
of d*a*/d*t* and also d*e*/d*t* rates. These two graphs are plotted for diurnal
variant of Yarkovsky force acting on regolith covered bodies.

We have observed an increase of semimajor axis for fragments smaller than
0.3 m and eccentricity 0.9, when only seasonal effect was working (diurnal effect
was supressed by the orientation of fragment's spin axis).
The y-axis of the plot is linear, not logarithmic as previously.

Drift of semimajor axis for **wide range of heliocentric distances** for small asteroid fragments
with radius *R* = 1 m. Notice that diurnal variant of thermal effect **is not** maximal for the
smallest initial semimajor axis, however changes of semimajor axes such close to the Sun are not
linear for the integration time 0.1 Myr.

Miroslav Broz:
miroslav.broz@usa.net,
last updated Mar 27th 1999