== [[span(style=color: blue, **SDC8	 Ghost calibration ** )]] ==

- **Phase**		:	1  
- **Status**		: 	[[span(style=color: blue, **to be done** )]]  
- **Category**	: 	Daytime calibration (C3)
- **Recurrence**	: 	once every 6 months, starting from commissioning.
- **Duration**	: 	5 minutes per configurations x 2 derotator positions.  (this duration is valid only during regular operations, i.e., after commissioning)

**Description**
- Recording the ghost positions at the contrast of <5x10^-7

**Prerequisites**
- Bad pixel map, Background 

**Procedure**
- Insert the point source lamp and acquire 2 exposures: the first one is a non-saturated exposure (DET.DIT and DET.NDIT), the second one is a saturated exposure.

**Templates**
- SHARKNIR_cal_mon_Ghost (not released)

**Success criteria**
- Accuracy: Position: 0.5 pixel; Contrast: 5.10^-7.

**Notes**
- Same as activity 9.5 in AD4

**LBTO support**

**Date performed and by whom**