Kathleen:
I took a look at the Vital Records Index but no luck. However, after some digging I came across this item about the Irish Orphans sent to Australia. You may already have this but am posting just in case.
http://www.irishfamine.org/names.htmlIRISH FAMINE ORPHANS MEMORIAL 
HYDE PARK BARRACKS SYDNEY~AUSTRALIA
Penrose Ann, Wicklow 
Penrose Bridget, Barraderrie, Wicklow 
Penrose Catherine, Wicklow 
Another item of possible help is:
Irish orphans
During the Famine in the 1840s a number of Irish orphans from the workhouses were shipped to Australia. Information about these orphans may be found in:
Barefoot and pregnant?: Irish famine orphans in Australia: documents and register / compiled and introduced by Trevor McClaughlin. (FAMHIS 929.102594 1991-2001)
Unnamed Irish boys on convict ships, 1841-1843, sent to Queen's Orphanage, Hobart, Van Diemen's Land / Joyce Purtscher (PAM 929.3946 1993)
Wages paid to orphans index, 1849-1851/ compiled by Aileen Trinder & Pat Stemp. 
(MFC 331.21086945 1996)
Contact details:
Family History             
State Library of Queensland      telephone     (07) 3840 7775
PO Box 3488            email       genie[AT]slq.qld.gov.au   
SOUTH BRISBANE   Q   4101    
Visit us at            website: 
http://www.slq.qld.gov.au/serv/fhHope this is useful.
Pat
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