P74-501
P74-501: An Interstellar Object Campaign
P.I.: Jane Luu
This is a SoftToO program for non-sidereal targets.
All observations will be triggered via the OB system.
ALFOSC instrument setup:
- U (#7), B(#74), V(#75), R(#76), i(#12)
The corresponding commands to run tcs.asteph for the different objects are:
- tcs.asteph -t comet -n 2017 K2
- tcs.asteph -n 2023 JN16
- tcs.asteph -t comet -n 12P
- tcs.asteph -t comet -n 2024 S1
- tcs.asteph -t comet -m optimal-ll -n 2024 S1
- tcs.asteph -t comet -n 2024 E1 (for the target Wierzchos)
- tcs.asteph -t comet -n 240P
Daytime calibrations:
Standard twilight flats are sufficient.
Run alfosc.alfosc-calibs in the morning after observations.
This provides biases for both modes with the window and/or binning used.
Observing instructions:
The OB comments will indicate the preferred order of the OBs whether
standards should be taken before or after.
- Go to directory: cd ~/obs/scripts/74-501/
Do ls -lrt to see the scripts and run them as indicated in the trigger. Note
the target "NAME" as given in the trigger for use below.
- When the OB generator asks you to do the pointing
and differential tracking in another sequencer window , do it as follows:
- tcs.asteph -t comet -n "NAME" or
- tcs.asteph -t asteroid -n "NAME"
this calls up JPL Horizons to get position and RA/DEC rates at the current UT.
Check that the output given in the terminal refers to the desired object.
- Cut and paste the sequencer commands output from tcs.asteph (the 4 last lines) one by one.
The 4th line starts the actual differential tracking and guiding:
tcs.reposition-guide-probe RA-rate DEC-rate
and you can check that this is happening by noting that the star box is moved to one edge of
the guide TV screen, and the guide star is entered.
- Now press return in the sequencer window where the
OB was started in order to continue the OB script and start the observations.
The star box is placed at the optimal position on the guide TV screen, the differential tracking
and guiding is started.
The autoguider box will move at the differential tracking rates and guiding will stop when the box reaches the
edge of the monitor (size is 70'').
Most likely the whole observation is
possible without having to reposition the star box on the autoguider screen, but if you
have to reposition, just repeat the above command:
tcs.reposition-guide-probe RA-rate DEC-rate
Note that the TCS will give a warning beep when there is 120 sec left before the star box reaches
the edge, then again at 90 and 60. Make sure you reposition before the edge is reached.
- In order to locate the target, which should be close to the centre of the CCD, you may need a finding
chart, especially for spectroscopy. In a browser on the Florence computer to your right, open either
of the links:
Note that for the Lowell astfinder you can enter the target name, set observatory to "950 la Palma",
FOV to 390'' for ALFOSC, and you have the possibility to set the time steps of the trajectory.
- In addition to comments in the OB queue, remember to fill the
SoftToO tracking log
of this program.
| Program Tracking |
| Proposal |
74-501 |
| Semester |
P74: 20261001 - 20270401 |
| Principal Investigator |
Jane Luu |
| Programme |
An Interstellar Object Campaign |
| Instrument |
ALFOSC |
| Time Allocation |
9 hours SoftToO |
| Total Nights |
9h |
| Type |
ToO/SoftToO |
| Notes |
|
| Total Time Spent |
(hh:mm)
|
| Proposal |
Date |
Time |
Type |
Targets |
Files |
Comments |
Status |
|
Empty table: no tracking data available (yet)
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
|
