Pulsar
PSR J2015+3404_P
Millisecond pulsar · binary system
A millisecond pulsar spinning 234 times per second: an old neutron star spun up again (“recycled”) by matter transferred from a companion. It shares a 50.615 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 | Cygnus |
| Period | 4.280 ms (234 Hz) |
| Dispersion measure | 208.0 pc/cm³ |
| Distance | 6,557 pc (21.4 thousand ly) |
| Companion | helium white dwarf (estimated), ~0.32 M☉ |
| Orbital period | 50.615 days |
| Discovery | 2025 · fast_gpps |
| Source | ATNF Pulsar Catalogue |
| Right ascension (J2000) | 20h 15m 14.5s |
| Declination (J2000) | +34° 04′ 00″ |
In the sky
Visible from the whole Northern Hemisphere and south to latitude 56° S. North of latitude 56° N it never sets. It stands highest at midnight in July, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out 21 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 379 million years.