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pos1

ASTROMET / POS1

Astrometric package for ESO/MIDAS

Introduction

This package is a MIDAS implementation of the original POS1 program developed by Richard West (ESO) in the 80's.

The input/output have been made compatible with Midas, but the algorithm has not been changed (as it proved to be extremely accurate, this would have been masochism). In this release, the user interface has been considerabely improved and the program has now the capability of finding its astrometric standard stars on the Internet, without any
help from the operator.

While the original POS1 was doing everything in one programme, the MIDAS version has been split in 3 steps:

  1. read the measurements and standard stars, and compute the transformation parameters (this step is performed by the ASTROM/TRANSFO, possibly called by the nicer interface of ASTROM/AUTO)
  2. edit the standard star table to remove/restore some stars (this step is performed by ASTROM/EDIT, or with the nicer interface of  ASTROM/AUTO)
  3. actually compute the converted coordinates (this step is  performed by ASTROM/COMPUTE)
Steps 1 and 2 can be iterated until a satisfactory result is obtained. The whole process can be performed in an iterative way that mimics the former POS1 calling the POS1.PRG programme (ASTROM/POS1); the user will be asked for all the parameters.

In most cases, step 1 and 2, including the automatic creation of the table of USNO-A1 reference star through the internet, can be performed almost completely automatically through ASTROM/AUTO.

A demo image is included, together with the corresponding files and output, in order to test that the program works well on your system.
 
 

User Interface

The package works with the standard MIDAS command system, and uses its graphical capabilities.

In the "automatic mode", the reference stars are identified using a "map" that is plotted over the image, as shown below:

An astrometric solution is then search iterativelly; at each iteration, the residual map is displayed (stars in use are green with a red residual vector, stars rejected are red):



Availability and installation

The source code and makefile are available as a gnuZipped tar file (cf below). The makefile is set for Linux (I use RH7.1) with SciSoft, but has information for Sun/Solaris and HP/UX. Requires MIDAS version 97NOV or newer. UnZip, untar, and look the INSTALL file. Normally,
  cd astromet/src
  make all
  make install
  make clean
should work.

In the same directory, another gnuZipped tar file (pos1_example.tar.gz) (3.4Mb) contains examples (image and tables) to test your implementation.

Some support can be provided by Olivier Hainaut (ohainaut@eso.org), to whom bug reports and suggestions should also be sent.
 

O.Hainaut, 2000 Feb 5

File archive:

Retreive the latest version from this list 
pos1_2003-02-26.tar.gz
pos1_2002-06-22.tar.gz
pos1_2001-11-05.tar.gz
pos1_2001-09-22.tar.gz
pos1_2001-07-11.tar.gz
pos1_2001-05-11.tar.gz
pos1_2001-02-14.tar.gz
pos1_example.tar.gz