(r4) JmmcAsproProjectConception < Jmmc/Software

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---+ 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 | [[http://jmmc.fr/~upsa/oischema/http___www.jmmc.fr_aspro-oi_0.1/complexType/InterferometerDescription.html][observatory reference]] |
|Date of observation ( or period of time )|like DDMMYYYYHHMM| Modified Julian Day |

Plot outputs:
TODO : How to represent the observability of a list of star onto multi-telescope


---+++ 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 <br/> 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 |
| environment shadowing ( telescopes, mountains, building ....)| angle d'obstruction ( de 0 a 90 degres) en fonction de l'azimuth (repere a definir) | couples of Altitude / Azimuth points ( pointer ver la specification (a faire) ) |
| telescope(s) min elevation | angle degree | angle radians |




|outputs|Internal/User| Format |
|  |  |  |


---+++ 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
[[http://www.dartmouth.edu/~physics/faculty/skycalc/flyer.html][JSkyCalc = Java version of skycalc]]<br/>
[[http://mhuss.com/AstroLib.html][AstroLib]]

---++ Various libraries
   * http://jas.freehep.org/jas3/





-- Main.GuillaumeMella - 15 Sep 2009
Topic revision: r4 - 2009-09-25 - GuillaumeMella