== P3.4	Telescope control – telescope mode, offset, and focal plane geometry estimation== 
•	**Phase**		:	3  
•	**Status**		: 	Draft	 
•	**Category**		: 	Nighttime testing (functionality and operability) (C4)
•	**Recurrence**	: 	once at commissioning
•	**Duration**		: 	1 night
**Description**
•	For the correct telescope mode for SHARK-NIR, find the offset direction & magnitude (for the field-stabilized mode), verify the proper image orientation, pixel scale, field of view, and distortion at the SCICAM. Note that this may be performed with and without AO running.
**Prerequisites**
•	Atmospheric conditions: should be able to see bight stars on sky (preferably close to zenith?).
•	Authorize SHARK-NIR on the SX side.
•	Suitable binary or astrometric targets.
•	AO running for part of the test.
**Procedure**
1.	**Procedure** for image orientation
	-	Select a filter
	-	Place the de-rotator in the nominal "zero" position.
	-	Issue a preset to move to a bright star (but not too bright to saturate)
	-	Center the star in the science channel
	-	Issue a pure elevation offset to the TCS of ca. 5” and verify expected motion direction on the SCICAM
	-	Return to the on-axis position and repeat with a pure azimuth motion.
	-	Issue a preset to move to a suitable astrometric binary (typically 5-8 arcsec separation) and center one star in the science channel.
	-	Based on the published coordinates of the binary, issue the appropriate offset to center the other star.
2.	**Procedure** for pixel scale/ plate scale
	-	Select a filter
	-	Issue a preset to move to a suitable astrometric binary to measure pixel scale (typically 5-8 arcsec separation)
	-	Center the binary in the upper half of the SCICAM and take several frames. Average these frames
	-	Move the binary to the lower half of the SCICAM and repeat.
	-	Use the difference image (optionally flat-fielded) to verify the expected pixel scale. This gives two measures.
	-	Repeat this for other filters.
**Success criteria**
•	The image orientation is as expected. The pixel scale and field of view of the SCICAM are as expected.
**Notes**
**LBTO support**
•	Support from telescope operator (if needed).
•	Presence of John Hill usually helps while collimating for the first time. 

**Associated SHARK-NIR personnel**

**Date performed and by whom**