OBAFGKM

AcronymDefinition
OBAFGKMOh, Be A Fine Girl/Guy, Kiss Me (mnemonic for the order of star temperatures)
OBAFGKMOnly Boys Accepting Feminism Get Kissed Meaningfully (mnemonic for the order of star temperatures)
OBAFGKMOnly Bad Astronomers Forget Generally Known Mnemonics (mnemonic for the order of star temperatures)
OBAFGKMOh Brother a Fat Gremlin Kicked Mickey (star order mnemonic)
OBAFGKMOfficially, Bill Always Felt Guilty Kissing Monica (mnemonic for the order of star temperatures)
References in periodicals archive ?
Author's Note: These three classes of stars aren't included because their compositions are significantly different than those in the OBAFGKM sequence.
For more than a century, the familiar spectral sequence OBAFGKM has stood firm.
No longer is it OBAFGKM (with side branches R, N, and S).
The result was the astronomer's basic spectral alphabet: the first three of Secchi's groups morphing into OBAFGKM; his deep red fourth group became class N.