Answer: bopp

AnswerCrossword Clue
BOPP

Half a comet's name

BOPP

Hale's comet co-finder

BOPP

Comet Hale-..

BOPPHale-.. comet
BOPP
1995 comet spotter Thomas
BOPP
Comet Hale-...
BOPPHale- ... comet
BOPPHale-... comet
BOPPHale-... (comet seen in 1997)
BOPPComet Hale- --