Pulsar
PSR B1658-37 (J1701-3726)
Radio pulsar
A neutron star spinning once every 2.45 seconds; the beams from its magnetic poles sweep across Earth on every turn. Period, spin-down, distance and orbit come from the ATNF Pulsar Catalogue; the beam geometry is illustrative.
| Type | Pulsar |
|---|---|
| Constellation | Scorpius |
| Period | 2.455 s |
| Period derivative | 1.1×10⁻¹⁴ s/s |
| Characteristic age | 3.5 million years |
| Magnetic field | 5.3×10¹² G |
| Spin-down luminosity | 3.0×10³¹ erg/s |
| Dispersion measure | 303.4 pc/cm³ |
| Distance | 12,950 pc (42.2 thousand ly) |
| Discovery | 1992 · pks1, htru_pks, pksmb |
| Source | ATNF Pulsar Catalogue |
| Right ascension (J2000) | 17h 01m 18.5s |
| Declination (J2000) | −37° 26′ 27″ |
In the sky
Visible from the whole Southern Hemisphere and north to latitude 53° N. South of latitude 53° S it never sets. It stands highest at midnight in June, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out 42 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 749 million years.