P71-508 Spectroscopic Study of Asteroid Phase Coloring
PI: A. Penttila
ALFOSC spectroscopy of moving targets. SoftToO/ToO observations.
Instrument setup required for ALFOSC:
- Blocking filter: #100 (GG420_416_LP)
- Grism #11
- Slit: 1.8"
Observing instructions:
- Go to the directory
cd ~/scripts/71-508
List the available OB scripts
ls -lrt
- Most likely there will be two OB scripts for the current trigger, one for the target and one for
the standard (solar analog).
Start the target OB script, when it tells you to do the pointing,
go to step 3.
- In another sequencer terminal run tcs.asteph as indicated by the PI in the OB comment.
For completeness we show below the usage with all possible options (the first option in each flag is the default)
tcs.asteph [ -t < asteroid|comet|planet|unconfirmed|horizons > ] [ -m < ima|para|along-slit|optimal-ll|optimal-lr > ]
[ -r < full|half > ] [-g < on|blind|update >] [-e INTIME] -n TARGET
The PI is responsible for giving you the the exact input for tcs.asteph, and it is typically:
- tcs.asteph -m para -n TARGETNAME
Typical target names are: 2566 for Kirghizia, 5240 for Kwasan,
and 2468 for Repin.
Below is given in green an example of what tcs.asteph outputs on your terminal screen.
EXAMPLE:
> tcs.asteph -t asteroid -m para -n Vesta
...
Your input target is - Vesta
Your observatory is Nordic Optical Telescope, La Palma.
Today is 2025-03-07
Your computer says time is 11:11 UTC.
Retrieving data from JPL Horizons...
Data retrieved successfully from JPL Horizons.
The object being searched for is 4_Vesta_A807_FA
Prefix for file names will be 2025-Mar-07.4_Vesta_A807_FA
***************************
These tasks should be given to the TCS:
***************************
tcs.append-object 4_Vesta_A807_FA-11 15 10 48.67 -07 22 59.8 2000.0 0.0 0.0 6.823
tcs.ag-off
tcs.guide-object-with-parallactic 4_Vesta_A807_FA-11
tcs.reposition-guide-probe 17.9142 4.301609
- Cut and paste the last 4 output lines in the sequencer window, one by one.
When done, differential tracking and autoguiding has started.
- Go back to the OB script and press return to start ALFOSC setup, slit acquisition and data taking.
The slit acquisition is interactive, as usual. In order to locate the target, the
NOT Aladin is useful.
- Remember to run the OB of a solar analog. This is a normal OB.
Thank you for your help!
P71 tracking
| Program Tracking |
| Proposal |
71-508 |
| Semester |
P72: 20251001 - 20260401 |
| Principal Investigator |
Antti Penttila |
| Programme |
Spectroscopic study of asteroids phase coloring |
| Instrument |
ALFOSC |
| Time Allocation |
22 hours ToO |
| Total Nights |
22h |
| Type |
ToO+SoftToO |
| Notes |
Override |
| Total Time Spent |
05:56 (hh:mm)
|
| Proposal |
Date |
Time |
Type |
Targets |
Files |
Comments |
Status |
|
| 71-508 |
2025-10-18 |
01:50 |
ToO |
Principia, GSC_04315-01020, HD1368,
HD19445, Kamo, HD283886, GJ246, Roberta,
HD243687 |
ALIj180066 - ALIj180071, ALIj180073 - ALIj180087, ALIj180114 - ALIj180155 |
Problems with acquisition of local analogs HD243687 and GSC_04315_01020. Otherwise all targets observed successfully through thin clouds and approx. 0.7 arcsec. seeing.
For GSC_04315_01020, the coordinates in the OB pointed the telescope to a completely different field than indicated in the finding chart. In the field given by the OB coordinates there were no bright stars. I pointed the telescope manually to the coordinates written on the finding chart's coordinate system - the target and corresponding field was visible at these coordinates. Please check that this is the target that you wanted.
For HD243687, when pointing the telescope to the OB coordinates, the field of view did not resemble the finding chart, and the object was not visible. A similar object with a more correlated field was found approx. a minute RA/DEC away from the given coordinates. This object was observed. However, the correlation between the finding chart and the field is questionable. Please check that this is the target that you wanted. |
Observed |
|
| 71-508 |
2025-10-19 |
00:31 |
ToO |
Principia, GSC_04315-01020, HD1368,
HD19445 |
ALIj190253 - ALIj190272 |
One science with 3 correlated std. stars observed - rest missed due to weather.
Observed through clear skies and approx. 1 arcsec. seeing. |
Observed |
|
| 71-508 |
2025-11-23 |
00:27 |
ToO |
HD1368, Principia, HD19445 |
ALIk230068 - ALIk230072, ALIk230079 - ALIk230083, ALIk230105 - ALIk230109 |
GSC_04315-01020 couldn't be observed due to cloudy weather. |
Observed |
|
| 71-508 |
2025-11-24 |
00:15 |
ToO |
HD1368, GSC_04315-01020, HD19445 |
ALIk240083 - ALIk240087, ALIk240122 - ALIk240126, ALIk240127 - ALIk240131 |
Cloudy, and the seeing was around 1.1". Not all targets could be observed due to bad weather. |
Observed |
|
| 71-508 |
2025-12-16 |
00:52 |
ToO |
HD1368, HD19445, Kamo, Roberta,
HD243687, GJ246 |
ALIl160088 - ALIl160092, ALIl160199 - ALIl160203, ALIl160221 - ALIl160235, ALIl160251 - ALIl160255 |
Observed all targets with clear skies and seeing around 1.5" - 2". The observation for the solar and local analogs were identical for the two groups, so I only observed them once. |
Observed |
|
| 71-508 |
2025-12-17 |
00:35 |
ToO |
HD84937, SA102-1081, Schalen, HD110747 |
ALIl170449 - ALIl170453, ALIl170481 - ALIl170497 |
Observed during high clouds and seeing <1.3". Schalen was a bit tricky to find, please check that the target is OK. |
Observed |
|
| 71-508 |
2025-12-18 |
00:36 |
ToO |
HD84937, HD110747, SA102-1081, Schalen |
ALIl180233 - ALIl180237,ALIl180284 - ALIl180288,ALIl180289 - ALIl180293,ALIl180294 - ALIl180299 |
All targets observed during thin clouds and seeing varying from 0.7 to 2". |
Observed |
|
| 71-508 |
2026-01-12 |
00:50 |
ToO |
HD1368, Principia, HD19445, HD26710,
GJ246 |
ALJa120069 - ALJa120073, ALJa120078 - ALJa120084, ALJa120085 - ALJa120089, ALJa120108 - ALJa120112, ALJa120113 - ALJa120117 |
Successful observations of HD1368, Principia and HD19445, but failed for GSC_04315-01020,
resulting in an overall failed block 33_2653_1201. GSC_04315-01020 failed due to a mismatch
in coordinates between the finding chart and target.
Successful observations of HD26710 (observed twice by mistake) and GJ246, but it was not
possible to observe Roberta* and HD76151 due to high levels of humidity after 23:15, resulting
in an overall failed block 33_335_1201. |
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
|
