PSR B1919+21

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Published on January 6, 2022 11:00:37 AM ● Video Link: https://www.youtube.com/watch?v=iVmOdklDpJE

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PSR B1919+21, by Wikipedia https://en.wikipedia.org/wiki?curid=1000060 / CC BY SA 3.0

#Rotation-powered_pulsars
#Vulpecula
#Astronomical_objects_discovered_in_1967
#Search_for_extraterrestrial_intelligence
PSR B1919+21 is a pulsar with a period of 1.
3373 seconds and a pulse width of 0.
04 seconds.
Discovered by Jocelyn Bell Burnell on 28 November 1967, it is the first discovered radio pulsar.
The power and regularity of the signals were briefly thought to resemble an extraterrestrial beacon, leading the source to be nicknamed LGM, later LGM-1 （for "little green men"）.
The original designation of this pulsar was CP 1919, which stands for Cambridge Pulsar at RA 19h 19m .
It is also known as PSR J1921+2153 and is located in the constellation of Vulpecula.
In 1967, a radio signal was detected using the Interplanetary Scintillation Array of the Mullard Radio Astronomy Observatory in Cambridge, UK, by Jocelyn Bell Burnell.
The signal had a 1.
337302088331-second period and 0.
04-second pulsewidth.
It originated at celestial coordinates 19h 19m right ascension, +21° declination.
It was detected by individual observation of miles of graphical data traces.
Due to its almost perfect regularity, it was at first assumed to be spurious noise, but this hypothesis was promptly discarded.
The discoverers jokingly named it little green men 1 （LGM-1）, considering that it may have originated from an extraterrestrial civilization,
but Bell Burnell soon ruled out extraterrestrial life as a source after discovering a similar signal from another part of the sky.
The original signal turned out to be radio emissions from the pulsar CP 1919, and was the first one recognized as such.
Bell Burnell noted that other scientists could have discovered pulsars before her, but their observations were either ignored or disregarded.
Researchers Thomas Gold and Sir Fred Hoyle identified this astronomical object as a rapidly rotating neutron star immediately upon their announcement.
Before the nature o...