Pulsar
PSR J1836-2354B
Millisecond pulsar · in the globular cluster M22(NGC6656)
A millisecond pulsar spinning 309 times per second: an old neutron star spun up again (“recycled”) by matter transferred from a companion. Period, spin-down, distance and orbit come from the ATNF Pulsar Catalogue; the beam geometry is illustrative.
| Type | Pulsar |
|---|---|
| Constellation | Sagittarius |
| Period | 3.232 ms (309 Hz) |
| Dispersion measure | 93.3 pc/cm³ |
| Distance | 3,300 pc (10.8 thousand ly) |
| Location | in the globular cluster M22(NGC6656) |
| Discovery | 2011 · misc |
| Source | ATNF Pulsar Catalogue |
| Right ascension (J2000) | 18h 36m 24.4s |
| Declination (J2000) | −23° 54′ 29″ |
In the sky
Visible from the whole Southern Hemisphere and north to latitude 66° N. South of latitude 66° S it never sets. It stands highest at midnight in June, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out 11 thousand years ago. At that time the first farming villages were being founded; there was no writing yet. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 191 million years.