07/03/03 48821 CTB Converted to XML format This relation is used for all members (exposure and product) that form an OPUS association. This is one of the relations used to describe OPUS associciations. The other relations are ASN_ASSOCIATION and ASN_PRODUCT_LINK. 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. An association product is a dataset, distinct from any exposure dataset, that is generated by the pipeline. Exposures are associated in order to generate products. For an exposure, the mem_number is two characters and is the same as ob_number. For a product, the mem_number is the combination of the association number within the obset and the product_id. Prior to the collection the member_status for exposures is 'U'. Afterwards, it is either 'C' or 'O'. The value for products is always 'P'. Prior to the collection the product_status for products is 'U'. Afterwards, it is either 'C' or 'M'. The value for exposures is always 'E'. 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. STIS can only have one product per association. NICMOS can have as few as one and as many as nine products. ACS can have a single product having a product_id of either '0' (for a dither product) or '1' for a cr-split or repeat-obs product at a single pointing. If there are more than one product the there is always a dither product having the product_id '0' and the other products use product ids that range from '1' to 'I'. This field completely identifies an association. It is set by TRANS. It is used by DADS as the dataset name to archive the association file. 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. C3 When a proposal is accepted into the PMDB by SPSS it must be assigned a unique 3 character base 36 program identifier. This is done by the PMDB/ACCEPT_PROP command. This program identifier is tagged as 'program_id' in most PMDB relations. Is is used for identification of proposals by spacecraft and OPUS software. It is also used in the OPUS and DADS rootname for all archived science data files. Because of flight design software, program_id must be three characters. C2 An observation set is a collection of one or more alignments that are grouped together based on FGS pointing requirements. That is, if multiple alignments can all be executed using the same guide star pair, they are grouped into the same observation set. An observation set is identified by a 2 character base 36 string. This field, typically called 'obset_id', will often contribute to the index on relation together with a proposal_id, version_num, and possibly other fields. OBSET is an abbreviation for observation set. C3 BASE_36 For exposures, observations are numbered sequentially throughout an observation set and are assigned by SMS/Gen. For exposures the name is two characters and it is the same as the observation ob_number. For products it is the association number (two characters) plus the product_id. C12 This field describes the role of the member in the association. If there are multiple products, then the format of the exposure names correlate to the product names by rules that depend on the SI. For exposures this name must be the same as exp_type in qeassociation. C1 This field describes the status of a member of the association. Valid values are: U -- uncollected exposure C -- collected exposure O -- orphan exposure (not collected) P -- product dataset C1 This field describes the status of a product of the association. Valid values are: U -- uncollected product C -- collected product N -- not collected - missing product after collection E -- exposure (not a product) X -- unknown (only valid for old records) ASN_MEM_TYPE Association Members Relation OPUS DADS unique clustered nonclustered