Pulsar
PSR B2127+11E (J2129+1210E)
Millisecond pulsar · in the globular cluster M15(NGC7078)
A millisecond pulsar spinning 215 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 | Pegasus |
| Period | 4.651 ms (215 Hz) |
| Period derivative | 1.9×10⁻¹⁹ s/s |
| Characteristic age | 397 million years |
| Magnetic field | 9.4×10⁸ G |
| Spin-down luminosity | 7.3×10³⁴ erg/s |
| Dispersion measure | 66.6 pc/cm³ |
| Distance | 10,710 pc (34.9 thousand ly) |
| Location | in the globular cluster M15(NGC7078) |
| Discovery | 1991 · misc, fast_gpps |
| Source | ATNF Pulsar Catalogue |
| Right ascension (J2000) | 21h 29m 58.2s |
| Declination (J2000) | +12° 10′ 08″ |
In the sky
Visible from the whole Northern Hemisphere and south to latitude 78° S. North of latitude 78° N it never sets. 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 35 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 620 million years.