Pulsar
PSR J1928+1815
Millisecond pulsar · binary system
A millisecond pulsar spinning 95 times per second: an old neutron star spun up again (“recycled”) by matter transferred from a companion. It shares a 3.60 h orbit with a neutron star. Period, spin-down, distance and orbit come from the ATNF Pulsar Catalogue; the beam geometry is illustrative.
| Type | Pulsar |
|---|---|
| Constellation | Sagitta |
| Period | 10.550 ms (95 Hz) |
| Dispersion measure | 346.1 pc/cm³ |
| Distance | 7,187 pc (23.4 thousand ly) |
| Companion | neutron star (estimated), ~1.40 M☉ |
| Orbital period | 3.60 h |
| Eccentricity | 0.000009 |
| Discovery | 2025 · fast_gpps |
| Source | ATNF Pulsar Catalogue |
| Right ascension (J2000) | 19h 28m 08.4s |
| Declination (J2000) | +18° 15′ 30″ |
In the sky
Visible from the whole Northern Hemisphere and south to latitude 72° S. North of latitude 72° 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 23 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 416 million years.