COIN (ROMAN)
A Roman silver denarius of Augustus (27 BC - AD 14), dating to the period 19 - 18 BC (Reece Period 1). DIVVS IVLIVS reverse type depicting an eight-rayed comet with tail upwards (a depiction of the Sidus Iulium or Jullian Star, a very bright comet visible in 44 BC and interpreted as signifying the deification of the recently assassinated Julius Caesar).   Spanish mint (Colonia Caesaraugusta?). RIC I (2nd ed.) p.44, no. 37a. 

Coin has a crease across the diameter, probably accidental.

Diameter 20.28 mm, thickness 1.8 mm and weight 2.76 g.
Ruler: Augustus
Denomination: Denarius (Empire)
Material: Silver
Mint: Spain
Obverse: Oak wreathed head left
Obverse legend: CAESAR AVGVSTVS
Reverse: Eight-rayed comet with upward tail.
Reverse legend: DIVVS IVLIVS
Dated: -19.0 to -18.0
Weight (g): 2.76
Diameter (mm): 20.28
Thickness (mm): 1.8
Completeness: Complete
Preservation: Fair
Parish: Shirland and Higham
District: North East Derbyshire
County: Derbyshire
Region: East Midlands
Discovery method: Metal detector
RIC reference: ric.1(2).aug.37A