== [[span(style=color: green, **P2.9 Star center Fourier mode images** )]]== 
 
- **Phase**		:	2  
- **Status**		: 	[[span(style=color: green, **COMPLETE** )]]	 
- **Category**	: 	Daytime testing (functionality and operability) (C3)
- **Recurrence**	: 	once after instrument installation at telescope platform
- **Duration**	: 	1 day

**Description**
- This calibration is performed to calibrate the center of the target star (hidden by the coronagraph) to provide a reference input for frame derotation in post-processing.

**Prerequisites**


**Procedure**
- Apply ASM Fourier modes to generate multiple satellite spots in the focal plane + AO closed-loop + coronagraph.
- The required specifications are the presence of at least four satellite spots placed symmetrically to the star, at separation within 5 and 15 lambda/D, with FWHM < 45 mas and separation precision < 6 mas.
- Find the centroids of the spots and fit a circle to them. The center of the circle is the extrapolated star position behind the coronagraph.
- The detailed sequence of tests is described in [https://docs.google.com/document/d/18j3rBLl6Z4qZXMq1UN-AXKVImgvY4kB7F6lc0gne8m4/edit link]

**Templates**
- SHARKNIR_gen_cal_StarCenter (not released)

**Success criteria**
- Accuracy < 10 mas (goal 5 mas) 
- A report of the activity performed can be found in this [https://docs.google.com/document/d/1vnRdx8hAINpr0Wz2YMvTYQotcwfshbDo/edit link]

**Notes**
- Same as activity 7.8 in AD4

**LBTO support**
- Authorize SHARK-NIR on the SX side.
- AO support (Juan Carlos, Xianyu, Guido)

**Date performed and by whom**
November 21st, Luca, Elena, Daniele, Davide R., Jacopo