== P3.15	Flux calibration (off-centered target observation) == 

- **Phase**		:	3  
- **Status**		: 	Draft	 
- **Category**	: 	Nighttime testing (functionality and operability) (C5) + Nighttime calibration (C6)
- **Recurrence**	: 	once at commissioning and then on request for deep coronagraphic observations.
- **Duration**	: 	2 hours

**Description**
- Flux calibration to allow contrast estimation between the central star and a close companion, by measuring the star flux out of the coronagraph 

**Prerequisites**
- Authorize SHARK-NIR on the SX side.
- Atmospheric conditions: AO working conditions.
- Bad pixel map, Background or Dark, Flat-field, distortion map 

**Procedure**
- On target, the same set-up as an observation on science target; AO closed-loop, ND for bright targets to prevent detector saturation, the star behind coronagraph centered and off-centered keeping the stop. The derotator mode should be tracking the field with possible angle adjustment to prevent the star from rotating around the coronagraph. 
- Observe a star with the coronagraphic devices after an offset of 0.5” is applied. 

**Templates**

**Success criteria**
- Flux of the star measured within the accuracy of 0.1 mag 

**Notes**
- Same as activity 7.2 in AD4

**LBTO support**
- AO support

**Date performed and by whom**