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* http://simbad.u-strasbg.fr/simbad/sim-id?protocol=html&Ident=PSR+J2144-3933&NbIdent=1&Radius=2&Radius.unit=arcmin&submit=submit+id |
* http://simbad.u-strasbg.fr/simbad/sim-id?protocol=html&Ident=PSR+J2144-3933&NbIdent=1&Radius=2&Radius.unit=arcmin&submit=submit+id |
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*{{cite web|url=https://www.sciencedaily.com/releases/1999/08/990825183711.htm|title="Undead" Star Torpedoes Current Theories|date=26 August 1999|publisher=Sciencedaily.com|accessdate=June 28, 2013}} |
*{{cite web|url=https://www.sciencedaily.com/releases/1999/08/990825183711.htm|title="Undead" Star Torpedoes Current Theories|date=26 August 1999|publisher=Sciencedaily.com|accessdate=June 28, 2013}} |
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*{{cite news|url=http://astrobites.org/2011/03/25/a-pulsar-alone/|title=A Pulsar Alone: The first deep X-ray and optical observations of the closest isolated radio pulsar|last=Kohler|first=Susanna|newspaper=Astrobites |publisher=Astrobites.org|date=25 March 2011|accessdate=June 28, 2013}} |
*{{cite news|url=http://astrobites.org/2011/03/25/a-pulsar-alone/|title=A Pulsar Alone: The first deep X-ray and optical observations of the closest isolated radio pulsar|last=Kohler|first=Susanna|newspaper=[[Astrobites]] |publisher=Astrobites.org|date=25 March 2011|accessdate=June 28, 2013}} |
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{{Neutron star}} |
{{Neutron star}} |
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| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Grus |
| Right ascension | 21h44m 12.10s |
| Declination | −39° 33′ 55.2″ |
| Characteristics | |
| Spectral type | Pulsar |
| Variable type | None |
| Astrometry | |
| Distance | approx. 587 ly (approx. 180 pc) |
| Details | |
| Rotation | 8.51 s |
| Other designations | |
EUVE J2144-39.6 | |
| Database references | |
| SIMBAD | data |
PSR J2144−3933 is a pulsar about 180 parsecs (587 light-years) from Earth. It is the coldest known neutron star with a surface temperature less than 42000 Kelvin as measured by the Hubble Space Telescope.[1] It was previously thought to have a period of 2.84 seconds but is now known to have a period of 8.51 seconds, which is among the longest-known radio pulsar.
J2144−3933 is also 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:
The fact that J2144−3933 is the coldest observed neutron star has been exploited to constrain the properties of dark matter.[3][4][5]
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| Discovery |
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| Satellite investigation |
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