== [[span(style=color: green, **P3.10	Sky background ** )]]== 
 
- **Phase**		:	3  
- **Status**		: 	[[span(style=color: green, **COMPLETE** )]]	  
- **Category**	: 	Nighttime testing (functionality and operability) (C5) + Nighttime calibration (C6)
- **Recurrence**	: 	once at commissioning and then on request.
- **Duration**	: 	2 hours

**Description**
- Acquire a series of sky backgrounds from science images. A short sky background may also be useful for remaining deviant pixel removal. 

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

**Procedure**
- Observe a blank field close to the science target (separation~10-20 arcsec) 
- The same set-up as nighttime science observations, but AO is not running, and the coronagraph may be removed. A list of telescope offsets is added to reach an “empty” field and jitter. 

**Templates**
- SHARKNIR_cal_SkyBackground

**Success criteria**
- 10% accuracy (dependent on measurement frequency) 

**Notes**
- Same as activity 7.6 in AD4

**LBTO support**

**Date performed and by whom**