Pulsar
PSR J1847+0342_P
Millisecond pulsar · binary system
A millisecond pulsar spinning 233 times per second: an old neutron star spun up again (“recycled”) by matter transferred from a companion. It shares a 3.34 h orbit with a very-low-mass companion. Period, spin-down, distance and orbit come from the ATNF Pulsar Catalogue; the beam geometry is illustrative.
| Type | Pulsar |
|---|---|
| Constellation | Serpens |
| Period | 4.290 ms (233 Hz) |
| Dispersion measure | 81.1 pc/cm³ |
| Distance | 2,933 pc (9.6 thousand ly) |
| Companion | very-low-mass companion (estimated), ~0.020 M☉ |
| Orbital period | 3.34 h |
| Discovery | 2025 · fast_gpps |
| Source | ATNF Pulsar Catalogue |
| Right ascension (J2000) | 18h 47m 30.6s |
| Declination (J2000) | +3° 42′ 00″ |
In the sky
Visible from the whole Northern Hemisphere and south to latitude 86° S. 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 9,566 years ago. At that time the first farming villages were being founded; there was no writing yet. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 170 million years.