P72-020: Physical properties of near-Sun asteroids via polarimetry

PI: Mikael Granvik

This is a SoftToO (1 hour) and Monitoring program (10.4 hours) using ALFOSC imaging polarimetry of objects with non-sidereal tracking.

The PI will indicate as a comment in the OBs the correct name to use for the target and the exact use of the command tcs.asteph.

Instrument setup:

FAPOL: lambda/2
ALFOSC: Calcite
ALFOSC: UBVRi.

Daytime calibrations:

Polarimetric domeflats.
Evening twilight flats.
Morning alfosc-calibs.

Monitoring Schedule

Date           UT-window     Duration    Comment
                               (min)

20251227       19:00-22:00       38       100004
20260117       19:00-21:00       38       100004
20260207       19:00-21:00       39       100004
20251220       19:00-22:00       39       100004

20260124       03:00-07:00       38       194268
20260127       04:00-07:00       38       194268
20260129       05:00-07:00       38       194268
20260201       05:00-07:00       38       194268  

20260324       20:00-22:00       39       248590
20260328       20:00-00:00       39       248590
20260330       04:00-06:00       39       248590

20251218       19:00-20:00       38       385402 
20251225       19:00-21:00       38       385402 
20251231       19:00-21:30       38       385402 
20260103       19:00-22:00       38       385402

The OB generator will be used to request all observations.

For the observer:

Go to the directory
cd ~/scripts/72-020
List the available scripts
ls -lrt
and execute the OB generated scripts for the appropriate date as requested.

Please, update the SoftToO or Monitoring tracking log of this program.

Program Tracking
Proposal	72-020
Semester	P72: 20251001 - 20260401
Principal Investigator	Mikael Granvik
Programme	Physical properties of near-Sun asteroids via polarimetry
Instrument	ALFOSC
Time Allocation	10.4 hours monitoring in 5 runs and 1h SoftToO
Total Nights	11.4h
Type	Mon+SoftToO
Notes	Fixed dates to be scheduled, Soft triggers during Nordic service or Technical nights
Total Time Spent	02:32 (hh:mm)

Proposal	Date	Time	Type	Targets	Files	Comments	Status
72-020	2025-12-18	00:27	Mon	-	ALIl180088 - ALIl180095	I couldn't find the target even after several tries. Tried teloffset around to see if the target was outside FOV but could only see star trails.	Failed
72-020	2025-12-20	00:42	Mon	100004	ALIl200062 - ALIl200094		Observed
72-020	2025-12-25	00:43	Mon	385402	ALIl250070 - ALIl250086	Clear skies, and the seeing was around 1.0".	Observed
72-020	2025-12-27	00:40	Mon	100004	ALIl270064 - ALIl270080	Thin clouds, and the seeing was around 1.4". Guiding was lost during the initial acquisition attempts; therefore, the OB was restarted to re-acquire the guide star and ensure consistent guiding for the remainder of the observations.	Observed
72-020	2025-12-31	00:00	Mon	None	None	Target covered by thick clouds minutes after entering dark time. Several attempts at establishing guiding failed.	Failed

The above information is collected from the ToO/Mon reports that have been created by the observer.

Should any of the observations have been carried out using the OB system, you will find additional information HERE

Last modified: November 25 2025