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PSR J2144-3933 is a pulsar about 180 parsecs (5.5 Em) from Earth. It was previously thought to have a period of 2.84 seconds but is now known to have a period of 8.51 s, which is among the longest known radio pulsar.
J2144-3933 is notable for other reasons: its mean pulse profile is very narrow in comparison to the pulse period with a half-intensity width of less than one degree of longitude. It also has the lowest spindown luminosity of any pulsar at about 3×1021 watts.
Writing in Nature, astrophysicists M. D. Young and coworkers consider this object and suggest that its existence throws current theories into doubt. They state:
Moreover, under the usual model assumptions, based on the neutron-star equations of state, this slowly rotating pulsar should not be emitting a radio beam. Therefore either the model assumptions are wrong, or current theories of radio emission must be revisedReferences
PSR J2144-3933 Wikipedia(Text) CC BY-SA