Pulsar
PSR J1929+2355_P
Millisecond pulsar · binary system
A millisecond pulsar spinning 209 times per second: an old neutron star spun up again (“recycled”) by matter transferred from a companion. It shares a 10.158 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 | Vulpecula |
| Period | 4.790 ms (209 Hz) |
| Dispersion measure | 206.8 pc/cm³ |
| Distance | 8,872 pc (28.9 thousand ly) |
| Companion | helium white dwarf (estimated), ~0.29 M☉ |
| Orbital period | 10.158 days |
| Discovery | 2025 · fast_gpps |
| Source | ATNF Pulsar Catalogue |
| Right ascension (J2000) | 19h 29m 44.8s |
| Declination (J2000) | +23° 55′ 00″ |
In the sky
Visible from the whole Northern Hemisphere and south to latitude 66° S. North of latitude 66° 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 29 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 513 million years.