Mass 2.784 × 10^30 kg (1.4 M☉) | Radius 0.9744 km (0.0000014 R☉) | |
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Similar Alpha Vulpeculae, Gliese 163 c, HD 189733, PSR B1257+12, Kepler‑296e | ||
Joy division s unknown pleasures sleeve aka psr b1919 21 using a pen plotter
PS 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 and Antony Hewish on November 28, 1967, it is the first discovered radio pulsar. The power and regularity of the signals was thought to resemble a beacon, so for a time the source was nicknamed "LGM-1" (for "little green men").
Contents
- Joy division s unknown pleasures sleeve aka psr b1919 21 using a pen plotter
- Normal game couch destiny psr b1919 21 1 6
- Discovery
- Nobel Prize controversy
- References
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.
Normal game couch destiny psr b1919 21 1 6
Discovery
In 1967, a radio signal was detected using the Interplanetary Scintillation Array of the Mullard Radio Astronomy Observatory in Cambridge, UK, by Jocelyn Bell and Antony Hewish. The signal had a 7000133730208833100♠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. After that, the discoverers proposed an alternative explanation that the signal might be a beacon or a communication from an intelligent extraterrestrial civilization and named it little green men 1 (LGM-1).
The signal turned out to be radio emissions from the pulsar CP 1919, the first one recognized as such. Bell 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 of the signal was determined, the researchers, Bell and her PhD supervisor Antony Hewish, somewhat seriously considered the possibility of extraterrestrial life:
We did not really believe that we had picked up signals from another civilization, but obviously the idea had crossed our minds and we had no proof that it was an entirely natural radio emission. It is an interesting problem – if one thinks one may have detected life elsewhere in the universe[,] how does one announce the results responsibly? Who does one tell first?
Nobel Prize controversy
When Hewish and Martin Ryle received the Nobel Prize in physics in 1974 for their work in radio astronomy and pulsars, Hoyle argued that Jocelyn Bell Burnell should have been a co-recipient of the prize.