Pulsar
PSR J2133-0049D
Millisecond pulsar · in the globular cluster NGC7089(M2)
A millisecond pulsar spinning 237 times per second: an old neutron star spun up again (“recycled”) by matter transferred from a companion. It shares a 3.430 days orbit with a helium white dwarf. Period, spin-down, distance and orbit come from the ATNF Pulsar Catalogue; the beam geometry is illustrative.
| Type | Pulsar |
|---|---|
| Constellation | Aquarius |
| Period | 4.216 ms (237 Hz) |
| Period derivative | 7.6×10⁻²⁰ s/s |
| Characteristic age | 877 million years |
| Magnetic field | 5.7×10⁸ G |
| Spin-down luminosity | 4.0×10³⁴ erg/s |
| Dispersion measure | 43.6 pc/cm³ |
| Distance | 11,690 pc (38.1 thousand ly) |
| Location | in the globular cluster NGC7089(M2) |
| Companion | helium white dwarf (estimated), ~0.27 M☉ |
| Orbital period | 3.430 days |
| Eccentricity | 0.000008 |
| Discovery | 2021 · fast_crafts |
| Source | ATNF Pulsar Catalogue |
| Right ascension (J2000) | 21h 33m 27.2s |
| Declination (J2000) | −0° 49′ 33″ |
In the sky
Visible from the whole Southern Hemisphere and north to latitude 89° N. It stands highest at midnight in August, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out 38 thousand years ago. At that time Homo sapiens was spreading out of Africa; there was no farming yet. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 676 million years.