07/03/03 48821 CTB Converted to XML format This relation is used to provide attributes that apply to entire associations. An association is a set of exposures that will be merged into products by OPUS pipeline. The full association consists of a list of exposures and products. This is one of the relations used to define associations for OPUS. ASN_MEMBERS and ASN_PRODUCT_LINK are the others relations. C9 This field identifies an OPUS association. An association is a set of exposures that will be merged into products by OPUS pipeline calibration processing. The full association consists of a list of exposures and products. This field completely identifies an association. This is the OPUS value used for the keyword ASN_ID. It has the following format: IPPPSSAAa where: I = instrument code (e.g., N for NICMOS, O for STIS), PPP = program_id SS = obset_id of the first associated exposure, AAa = the two-character sequence (AA = 01,02,...) is unique within the obset SS; plus the product id (a) that is always 0 for associations and primary products. C4 This is the identifier type for a Science Instrument (SI). The SI list includes the: FOC - Faint Object Camera FOS - Faint Object Spectrograph WFII - Wide Field Planetary Camera 2 HRS - High Resloution Spectrograph CSTR - COSTAR FGS - Fine Guidance Sensor NIC - NICMOS STIS - Space Telescope Infrared Spectrograph ACS - Advanced Camera for Surveys COS - Cosmic Origins Spectrometer WF3 - Wide Field Planetary Camera 3 C17 This field contains the latest predicted time of the exposure members of an association. It uses the standard SOGS time format - yyyy.ddd:hh:mm:ss where yyyy = year ddd = day of year hh = hours mm = minutes ss = seconds C17 This field contains the date of the association file created by OPUS. It uses the standard SOGS time format - yyyy.ddd:hh:mm:ss where yyyy = year ddd = day of year hh = hours mm = minutes ss = seconds ASN_ASSOC_TYPE Association Relation OPUS DADS unique clustered nonclustered nonclustered