Observer circumstances

Observer location: show service observer info. if available
Latitude , East longitude
Local date at start of night (yyyy mm dd):
Time zone for output:
Size for DSS finder charts (arcminutes): Width , Height
Target list:

Objects circumstances selection criteria

  1. Object altitude above degrees
  2. Minimum time span observable if not specified in targets file: observable at least hours
    • (Select for specified span length to override targets file values in all cases)
  3. Observable starting no later than minutes after start of night
  4. Observable until at least minutes before end of night

Objects brightness selection criteria

  1. Predicted mean V magnitude brighter than and also fainter than
  2. H magnitude brighter than and also fainter than
  3. H magnitude for selection and for predicted V magnitudes:
    • use Koronis program H and G if available
    • use MPC catalog H and G in all cases

Sky brightness selection criteria

  1. Sun altitude below degrees
  2. Moon must be either
    • at least degrees away from object, or
    • at least degrees from the object and also less than % lit