ASTRO-F Visibility Tool

• Coordinate system & epoch
  Select coordinate system and epoch for Equatorial / Ecliptic coordinates. The epoch is ignored if Galactic (G) is selected for the coordinate system.
  The Coordinate system & epoch, Longitude and Latitude are overridden if the Object name if given.

  Note: B1950 is not accepted for target list.

• Longitude
  Enter the longitude of the queried coordinates. Either a sexagesimal expression with the separator ':' or a decimal degree expression is accepted. It is not necessary to use the same expression that used for Latitude. Note that in the sexagesimal expression the highest term is to be interpreted as 'hour' in the 'Equatorial' coordinate systems while as 'degree' in the 'Ecliptic' and 'Galactic' coordinate systems.
• Latitude
  Enter the latitude of the queried coordinates. Either a sexagesimal expression with the separator ':' or a decimal degree expression is accepted. It is not necessary to use the same expression that used for Longitude. The preceding '+' is optional.

• Observation period
  Select the observation period to be considered.

  Note that the periods are defined for user's convenience and are not the final operation plan.

• Object name & Name resolver
  Enter the object name and select the name resolver engine. This Object name input, if any, overrides the inputs of Coordinate system & epoch, Longitude and Latitude. The character string given in the text field is submitted as is to the resolver engine, accordingly the available expression of the object name is engine-dependent; refer to the original documents (SIMBAD, NED) for detail.