Annex 1, Fields 7-10: System Geometry

• Field 7: Date of observation of the relative position (for separations smaller than 10 arcsec)
• Field 8: Position angle in degrees (when available)
• Field 9: Separation in arcsec (when available)
• Field 10, 1st digit: O = system with known orbit
• Field 10, 2nd digit: A = astrometric binary