README web version of /home/usg/OPS/MTS/readme_xml/readme_75018100
Principal Investigator Email Address
Estimated Total Execution Time (hours, including overheads)
General Description
With this program we want to get spectra of TRITON.
Triton is a moving target so particular care has to be paid for its identification
and positioning in the slit.
Triton has two different hemispheres (leading and trailing) and we plan to observe
both.
The two distinct sides are visible in two different nights.
The observation for each night are exactly the same.
We plan to deepen some spectral features we detected in a previous run. Some features
are at about 0.4mic, while others are at about 0.8mic.
For this reason we plant to use:
REMD+Gr13+2"slit centered at 0.8mic
BLMD+Gr5+2"slit centered at 0.4mic
Moreover for a direct comparison with our previous data, we plant to cover the full
0.4-0.9mic range, by using:
RILD+Gr1+2"slit
This has to be done ONLY IF the REMD and BLMD have been succesfull.
For each configuration I prepared an OB. Each OB is independed, i.e. it contains
acquisition and spectroscopy, as triton is a moving target and before starting with
spectroscopy it is ALWAYS better to check its position.
Finally for each night spectra of two solar analogs have to be taken. They are
landolt 115-271 and 112-1333. For each star REMD, BLMD and RILD have to be performed.
Waiver Requests
Critical Observing Condition Constraints
The observation of TRITON has several constraints.
The main thing to remind is that we want to observe TWO different hemispheres.
Considering that Triton is orbitating around Neptune in 5.8 days, the two hemispheres
are periodically visible but only for few hours for each time.
So, becasue the observations can only be executed in short time windows,
we do not required any special observing condition contraints, like moon phase,
seeing etc.
The only contraints rise from the timing just discussed and the elevation of the
target above the horizion.
The EPHEMERIS attached provide the position of the target ONLY when it can be succesfully
observed. The period of observability is restricted to August-September 2005.
Time-Critical Aspects
In order to have the best visibility of both hemispheres, the observations
have to be executed in well defined time windows.
In the following the dates in which the leading and trailing sides are observable
are listed.
For each date all the information about the target (RA,DEC, motion, etc...) are
reported in the ephemerid file.
**** LEADING SIDE *****
August:
4-9-15-21-27
September:
2-8-14-20-26
**** TRAILING SIDE *****
August:
1-6-7-12-18-24-30
September:
5-11-17-23-29
---------------------------
IMPORTANT:
1-NOTICE that we attached to each OB the correspondent finding charts.
For each night the finding charts are different. For this reason we attached only
the
finding charts corresponding to Service Nights as seen from the general schedule
on ESO web site. In case of changing, please concact the PI, in order to prepare
new finding charts.
IMPORTANT: 5-july-2005: we provided FCs for all the nights listed before by email,
as requested by the astronomer!!!
2- In the finding charts are also reported the positions of Neptune. It's VERY bright
(V=8) and it should be used to identify Triton!! The position of triton wrt neptune
is also reported in the zoomed ephemeris files.
Special Execution Requirements
As indicated in the General Description, we plan to observe with REMD,
BLMD and RILD.
The most important modes are REMD, BLMD: they must have the highest priority!
ONLY when they have been accomplished and if there is still time (we have 2hr for
each night, which should be more then sufficient) also the RILD mode can be executed.
There is no preference of which hemisphere is observed first.
IMPORTANT: the position of the target vary with time. Before starting with an
OB the astronomer HAS TO insert some values in the OBs. This can only be done
at the moment of the observation.
These values are: RA and DEC, differential tracking in RA and DEC, rotator offset
angle.
These values can be directly seen in the ephemeris files (every 15 minutes).
IMPORTANT: the slit has to be oriented in such way to be perpendicular
to the line triton-neptune. In this way we minimize the influence of
the diffuse light from neptune. according to the definition of the
SatPANG and the conventions for EMMI-RILD and EMMI-MEDIUMRESOLUTION,
the following Rotator Offset Angle have to be insered at the moment of
the observation:
EMMI-RILD: Rotator Offset Angle= SatPANG
EMMI-MD: Rotator Offset Angle= SatPANG + 90
SatPANG is reported in the ephemerid file for each triton's position.
Notice that because the Rotator Angle varies with time, it is meaningless to
report the slit position on the finding charts.
!!!!NOTICE: BEFORE SCHEDULING CHECK IF THE TRITON FACE IS LEADING OR TRAILING IN
ORDER TO DO
NOT OBSERVE THE SAME FACE TWICE!!!! EACH FINDING CHARTS REPORTS WHICH FACE REFERES
TO.
Special Calibration Information
ToO Information
ToO Activators List
Is this a Pre-imaging run ?
Pre-imaging Requirements
Source(s) of Pre-imaging
Pre-imaging sources not listed above
Do all your OBs comply with the instrument-specific requirements listed
on the instrument-specific Phase 2 web page ?
If this is a pre-imaging run, did you select PRE-IMAGING for the Observing
Category for each Observing Template ?
Do all your finding charts comply with both the general and instrument-specific
Phase 2 Web Pages ?
If you submitted OBs for standard stars, did you specify the magnitude
and spectral type of all standard stars in the OBs ?
Have you included OBs for any calibrations that you need but which are
not part of the Calibration Plan ?
If you are observing Moving Targets, have you attached suitable ephemeris
files to your OBs?
If you have preferences which OBs should be executed first, did you make
use of the User Priority field in the OBs ?
If this is a run that requires coordinated observations with other facilities,
did you give proper instructions in the Time-Critical Aspects Section ?
Last creation of page: Tue Oct 6 15:40:06 2009
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