2MASS Dithering Pattern

The following graphs show the dithering pattern produced by Eric Howard's latest suggested step size of 82.80" and a camera rotation angle of 0.02^o. This produces a net rotation of:

Band	Array Rotation (o)
J	0.509
H	0.571
K	0.472

Using the following plate scales:

Band	Plate Scale ("/pixel)
J	1.9966
H	2.0060
K	1.9839

gives the following step sizes in pixels:

	Single Frame step in pixels		6th frame step in pixels
Band	In-scan	Cross-scan	In-scan	Cross-scan
J	41.47	0.37	248.81	2.21
H	41.27	0.42	247.64	2.47
K	41.73	0.35	250.41	2.06

The resulting dither patterns are:

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For comparison, here are the dithering patterns for two other minima found by Mike Skrutskie, at a step size of 81.59" and a rotation of 0.526^o, on the left, and a step size of 82.60" and a rotation of 0.326^o, on the right:

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