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ISOLOG - ISO (Infrared Space Observatory) Observation Log

HEASARC
Archive

Overview

This database is the ISO (Infrared Space Observatory) Observation Log of Validated Data. ISO is an ESA (European Space Agency) project with instruments funded by ESA member states (especially the PI countries of France, Germany, the Netherlands and the United Kingdom), and with the participation of ISAS (Japan) and NASA (USA). ISO operated from November 1995 till May 1998, almost a year longer than expected.

As an unprecedented observatory for infrared astronomy, able to examine the cool and hidden places in the Universe, ISO successfully made nearly 30,000 scientific observations. The ISO data can be retrieved from the ISO Data Archive (http://iso.esac.esa.int/ida/), which is available at the ISO Data Centre (http://iso.esac.esa.int/), and comprises about 150,000 observations, including calibration, parallel mode and serendipitous observations.

The present catalog contains all observations performed in standard observing modes exempt from technical problems; special flags indicate calibration observations. The catalog gives observation details and provides links to quick-look images depicting the data and to observation-specific documentation.

The ISO helpdesk can be reached at http://iso.esac.esa.int/esupport/


Catalog Bibcode

<VI/111/isolog.dat.gz>

References

ISO Observation Log
    <ISO Data Centre (2004)>

Provenance

This online catalog was last updated by the HEASARC in September 2004 based on the machine-readable table ftp://cdsarc.u-strasbg.fr/pub/cats/VI/111/isolog.dat.gz obtained from the CDS data center.

Data Products

There are several (remote to the HEASARC) data products available for many of the observations in this catalog.

The first data product type is the ISO "Postcard" for the observation, where the ISO Project defines a Postcard as one of two types of "static representations in GIF-format of the survey products. Icons are small images intended to give an impression of the data: photometry, an image or a spectrum. Postcards are essentially enlarged icons with annotations added to give users an impression of the flux levels and wavelengths covered. Icons and postcards facilitate a quick-look to scan the data for their particular purposes and identify which data need to be retrieved." More information about the ISO Postcard data products can be found at

http://www.iso.vilspa.esa.es/users/expl_lib/guide/guide.html#postcard

The other data products types available include the raw data, the fully (pipeline) processed data set, and the highly processed data products set.

The final data product type is the abstract of the ISO proposal under whose aegis the observation was made. The whole set of ISO abstracts can be found at ftp://cdsarc.u-strasbg.fr/pub/cats/VI/111/abstract/


Parameters

FOV
The maximum field of view (FOV) of the observation, in arcseconds by arcseconds. For a number of Short-Wave Spectrometer (SWS) observations done with the Calibration Uplink System (the S99 observations) this parameter contains "------N/A" meaning not applicable.

Name
The target name (as given by the observer), and sometimes some additional comments or information. It appears, for example, that the last six characters of this field contain, for solar system objects, a unique identifier, e.g., "200400" for Mars.

Instrument_Mode
The ISO Astronomical Observing Template (AOT), or instrument and observing mode. The four instruments on ISO were ISOCAM, a mid-infrared camera (2.5 -17 microns), ISOLWS, a long wavelength spectrometer (43 - 196.7 microns), ISOPHT, an imaging photo-polarimeter (2.5 - 240 microns), and ISOSWS, a short wavelength spectrometer (2.4 - 45 microns). The observing modes of these instruments are summarized below:

       CAM01 General Observation
       CAM03 Beam Switching
       CAM04 Spectral Observations
       CAM05 Polarisation
       LWS01 Grating Wavelength Range Spectrum
       LWS02 Grating Line Spectra
       LWS03 Fabry-P<e'>rot Wavelength Range Spectrum
       LWS04 Fabry-P<e'>rot Line Spectra
       PHT03 General Multi-filter Photometry with PHT-P
       PHT04 General Multi-aperture Photometry with PHT-P
       PHT05 Absolute Photometry with PHT-P
       PHT17 Sparse Map with PHT-P (start AOT)
       PHT18 Sparse Map with PHT-P (intermediate AOT(s))
       PHT19 Sparse Map with PHT-P (end AOT)
       PHT22 Multi-filter Photometry with PHT-C
       PHT25 Absolute Photometry with PHT-C
       PHT32 Multi-filter Map / Linear Scan with PHT-C
       PHT37 Sparse Map with PHT-C (start AOT)
       PHT38 Sparse Map with PHT-C (intermediate AOTs)
       PHT39 Sparse Map with PHT-C (end AOT)
       PHT40 Spectrophotometry with PHT-S
       PHT50 Single Filter Polarimetry with PHT-P
       PHT51 Single Filter Polarimetry with PHT-C
       SWS01 Low-Resolution Full Grating Scan
       SWS02 Grating Line Profile Scan
       SWS06 Grating Scan
       SWS07 Combined Fabry-P<e'>rot Line Scan and SW Grating Scan

  In addition, three instruments had complementary observing modes:

       CAM: Parallel observation while another instrument was prime
       LWS: Parallel observation while another instrument was prime
       PHT: Serendipity survey at 170 microns during satellite slews
  

TDT
The Target Dedicated Time (TDT) Number of the observation. Each observation is uniquely identified by this 8-digit number, the first three characters of which identify the ISO revolution (orbit number: ISO's orbital period was close to 24 hours, so that a revolution was roughly equivalent to a day) on which it was executed and the last two of which are an identifying number given to that observation by the observer in the original proposal.

RA
The Right Ascension of the center coordinates of the observation, as recalibrated after the mission, in the selected equinox. The RA was provided in the CDS table from which this database was created in J2000 equatorial coordinates in decimal degress and with a precision of 0.0001 degrees.

Dec
The Declination of the center coordinates of the observation, as recalibrated after the mission, in the selected equinox. This was provided in the CDS table from which this database was created in J2000 equatorial coordinates in decimal degrees and with a precision of 0.0001 degrees.

LII
The Galactic Longitude corresponding to the center coordinates of the observation (but see caveats for ra and dec parameters).

BII
The Galactic Latitude corresponding to the center coordinates of the observation (but see caveats for ra and dec parameters).

Min_Wavelength
The shortest wavelength (in microns) photons which were collected, i.e., for photometry, this corresponds to the lowest passband wavelength, while, for spectra, this corresponds to the shortest observed wavelength.

Max_Wavelength
The longest wavelength (in microns) photons which were collected, i.e., for photometry, this corresponds to the highest passband wavelength, while, for spectra, this corresponds to the longest observed wavelength.

Calibration_Flag
This flag parameter is set to 'Y' to indicates that the observation was a calibration observation. The calibration observations performed with the flexible Calibration Uplink System correspond to AOTs of type "99". Only for CAM99 the pipeline produces scientifically validated products and postcards. This flag therefore is set for the other instruments only.

Observer_ID
This 8-character field is an identification of the observation's provenance, being either the (often truncated) name of the observer who proposed the observation, or an indication that the observation is a calibration, e.g., "SWS_CAL".

Abstract_Flag
This is a flag that if set to "Y" indicates that the abstract of the proposal for which the observation was made is available at: ftp://cdsarc.u-strasbg.fr/cats/VI/101/abstract/ The abstract is named after the observer_id and the proposal_id, e.g., for the observation with observer_id = "MROWANRO" and proposal_id = "SURVEY_4", the abstract is named MROWANRO_SURVEY_4.abs

Proposal_ID
This 8-character field is an identification of the specific proposal (of the observer or program specified by the observer_id parameter) under which the observation was carried out. Thus, the combination of the proposal_id and the observer_id completely specifies the provenance of an observation.

Time
The date and time corresponding to the start of the ISO observation. This information was given to a precision of 1 second in the originating CDS table from which this database was created.

Duration
The duration of the observation, in seconds.


Contact Person

Questions regarding the ISOLOG database table can be addressed to the HEASARC User Hotline.

Page Author: Browse Software Development Team
Last Modified: 19-Jul-2010