README web version of /home/usg/OPS/MTS/readme_xml/readme_78501400
Principal Investigator Email Address
Estimated Total Execution Time (hours, including overheads)
General Description
The goal is ISAAC SWS1-MR spectroscopy of a cool brown dwarf, with the
spectrum centred at 1.54micron.
The target is faint H=18.5, so acquisition is achieved by centering the 'offset
star' marked on the finding chart, in the slit, and then applying the offset. I
have done the acquisition in the J band as the object is brightest in J, and so
it might be possible to see it in the acquisition image - in which case it could
be placed in the slit directly. This will circumvent any possibility of proper motion
affecting acquisition. Nevertheless a preliminary measurement of the p.m. indicates
that it is very small, <0.2"/yr, and the measured position is from only 14months
ago.
The three OBs are virtually identical and each include 4 x 600s integrations offset
by 10" each other. Each set of 4 spectra (i.e. each OB) is in turn slightly offset
from the others. The end result will be 12 x 600s spectra all slightly offset from
each other.
The GenericOffset template was used in order to specify exactly where each spectrun
falls on the array. This will allow the averaging technique employed by Weatherley
et al (2005, MNRAS358, 985) in sky subtraction, to improve the final S/N.
The standard telluric calibration i.e. a telluric taken at similar airmass will
be satisfactory as telluric absorption over this wavelength range is very modest.
Although the source is faint, H=18.5, at the red end of the spectrum, 1.58micron,
the source should be visible in a single sky-subtracted integration, allowing accurate
registration of all the spectra.
The coordinates of the offset star are 00 34 2.923 -00 52 26.64 (J2000)
The coordinates of the target are 00 34 2.771 -00 52 6.78
Waiver Requests
Critical Observing Condition Constraints
Time-Critical Aspects
Special Execution Requirements
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 ?
If you submitted OBs for standard stars, did you use the provided StandardStar
templates ?
If you are using a specific offset pattern or position angle, did you
check carefully the definition in the manual ?
If you are doing spectroscopy, did you draw the slit on the Finding Charts
?
Did you enter the magnitude of the brightest star in the field-of-view
in the 'Instrument Comments' field of each OB ?
If you use the MoveToPixel acquisition, have you given clear instructions
on the FC and in the OB comment section as to how the field should be centered ?
Last creation of page: Tue Oct 6 15:40:17 2009
If you have comments, please contact usd-help@eso.org