Persistent Signal Catalog · Class II
CP 1919 / PSR B1919+21
The first discovered radio pulsar, initially recognized as an unusually regular signal in Cambridge chart records. Now understood as emission from a rotating neutron star and retained as a calibration case for disciplined source interpretation.
The first discovered radio pulsar, initially recognized as an unusually regular signal in Cambridge chart records. Now understood as emission from a rotating neutron star and retained as a calibration case for disciplined source interpretation.
Public packet
- first-pulsar comparison record
- periodicity and pulse-width summary
- historical interpretation note
- resolved-source calibration case
Review controls
- Coordinate source
- J2000 pulsar position rounded from public catalog identifiers
- Uncertainty
- Catalogued pulsar position rounded for public Night Watch display
- Release state
- Resolved reference case
- Marker use
- catalogued pulsar coordinate
Processing notes
- periodicity review against terrestrial interference
- resolved-source classification comparison
- radio pulse cadence retained as calibration reference
Ordinary-source checks
- resolved as a pulsar after follow-up
- retained as a false-origin caution case
- periodicity alone is not treated as evidence of unknown origin
Release limits
- included as a resolved comparison case
- no claim is made that periodicity alone indicates unknown origin