Use M25 for any year on this date.

Name: Messier 25, SGR
Birthday from Jack’s initial research: Dec 28
Magnitude: 4.6
Spectrum/Star type: Blue
Distance in Light Years: 2000
Date best observed: Aug 13
Additional information: A modestly bright small cluster with 50 stars – a bright spot in The Milky Way. It is young – only 50 million years old. It is number 24 in Messier’s Catalog of objects he would not confuse with a comet.