New South Wales jockey Mathew Cahill and four other people have been charged with offences relating to the running and handling of Astronomer who finished third in a maiden at Goulburn in June.
Cahill faces a charge of not allowing the horse to run on its merits.
Bookmakers Richard Knight and Ken Orbell, a part-owner, have been charged with two other owners, Robert Grynberg and Guy Orbell.
Guy Orbell has been charged with entering into an arrangement with Cahill to not allow the horse to run on its merits, while Grynberg has been charged with being a party to that arrangement and laying the horse with betting exchange Betfair.
Knight has been charged with improper action in that he had prior knowledge of Astronomer not being allowed to run on his merits and laying the horse with Betfair.
Ken Orbell will face charges relating to his possession of an unapproved telephone while fielding at Walgett races on the day. Stewards will continue their inquiry on September 11.
In other news, injured Sydney jockey Hari Singh has been moved into a rehabilitation centre as he continues to make steady progress from head injuries suffered in a race fall. Singh fell from Blue Onyx at Tamworth last Tuesday week.