== [[span(style=color: green, **P3.18	Point the slit** )]]== 
 
- **Phase**		:	3  
- **Status**		: 	[[span(style=color: green, **COMPLETE** )]]
- **Category**	: 	Nighttime testing (functionality and operability) (C5)
- **Recurrence**	: 	before every observing target (LSS), starting from commissioning
- **Duration**	: 	8 hours

**Description**
- This activity will point the long slit at the (known) position angle of an off-axis source.

**Prerequisites**
- Atmospheric conditions: AO working conditions.
- Authorize SHARK-NIR on the SX side.

**Procedure**
- Preset to a star with known companion (either a planet or a stellar companion)
- Center the star behind the slit occulter
- By moving the instrument derotator, point the slit at the nominal (known) position of the companion. 

**Templates**
- TBC

**Success criteria**
- Spectrum of the companion clearly distinguishable in raw data. It requires low star-to-planet contrast.
- Direct imaging of the companion?

**Notes**
- Elena on 12 Oct 2023: For this activity, "we did not use a template. We insert in the RTC interface the position angle of the off-axis object and start the FIELD_FIXED tracking directly from the RTC interface by clicking a button on the display, so the bearing will move to the right angle for pointing the slit". In the course of time, the procedure will be improved (also gaining experience) and perhaps, the details will be directly incorporated in the command to preset'.

**LBTO support**
- AO support

**Date performed and by whom**