<b>Field 6</b>: Epoch for the position

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Field 6: Epoch for the position

The epoch is for the position given in fields 4-5 and 10-15. The field is blank for epoch J2000.0.

[]Epoch J2000.0 was chosen for the Input Catalogue publication, corresponding to the `standard' epoch common to all recently-published catalogues, even though the epoch for the version used for satellite operations was 1990.

If the epoch is specified, this indicates that only a single epoch position is available, and therefore no proper motion can be derived. Where relevant, the stated epoch refers to the average of the epochs for and .

The Meudon Hipparcos Input Catalogue Team
mer 16 nov 15:51:31 MET 1994