Conventions

All angles or coordinates are stored internally in radians

Use cases

Observability of a source (or list of sources) for a given interferometer

Inputs	User format	internal format
Star coordinate	anything valid (name or any std coords)	RAJ2000,DEJ2000
Observing site location	selection of one supported observatory	observatory reference
Date of observation ( or period of time )	like DDMMYYYYHHMM	Modified Julian Day

Is the source visible in the sky ?

Is the source over the horizon ?

outputs	Internal/User	Format
celestial coordinates	Internal	HA / delta ?? units TBC TBD
over the horizon	User	boolean

What is the AirMass value ?

Inputs	User format	internal format
Seeing	choice or value ?	TBD
Humidity / Temperature...	choice or value ?	TBD

outputs	Internal/User	Format
AirMass	User	double

What is the best method to get the airmass value?

Where are the sun / moon ?

Inputs	User format	internal format
twilight constraints	angle degrees GM: est-ce que ASTRO/NAVAL/CIVIL sont des valeurs discrites qui parlent ?	double radians

outputs	Internal/User	Format
sunrise sunset moonrise moonset	User	DateTime couples

Est-ce qu'il faut gerer d'autre planetes sources lumineuses ??? Quelles doit etre la precision pour les ephemerides?

Is the star still visible given to a shadowing ???

Inputs	User format	internal format
telescope shadowing	N/A	double radians

outputs	Internal/User	Format
sunrise sunset moonrise moonset	User	DateTime couples

What is the formulae of the observability given to the whole previous results?

A-t'on besoin de calculer l'AirMass par station? Est-ce que la voute celeste est la meme pour toutes les stations a un meme moment?

S'arrete-ton des le premier critere mauvais ou doit on faire un bilan de pertes...( par ex: une mauvaise airmass compensee par un configuration optique avec moins de pertes)

Comment gere-t'on l'observalité d'une liste d'etoiles? Est simplement la juxtaposition des resultats independants ou y-a t'il des contraintes de gestion par groupe?

Modelling of a source from a given interferometer

TBD

Various informations

Station Coordinates

The software handles station coordinates as described in the OIFITS (see OI_ARRAY table description).

VLTI configuration

Eso defines the coordinates in an propriatary maner. The right way to get the right informations is to read the data from an AMBER oifits generated by ASPRO.

CHARA configuration

Chara expresses the station coordinates in the same format as OIFITS : TBD find URL

Java astronomy libraries

JSkyCalc = Java version of skycalc
AstroLib

-- GuillaumeMella - 15 Sep 2009