Measured 2013 from Trapezium data from Dec. 2012:

Instrument Angle

Value for NORTHCLIO:

NorthClio = -1.80 +/- 0.10 deg

See how to rotate to get North up, East left at Orientation (True North)

Plate Scale

platescale = 0.02749 +/- 0.00012 arcsec/pix

platescale = 27.49 +/- 0.12 mas/pix

platescale = 0.01585 +/- 0.00004 arcsec/pix

platescale = 15.85 +/- 0.04 mas/pix

2014/09/25, Katie Morzinski