Pulsar
PSR J1803-3002A
Millisecond pulsar · in the globular cluster NGC6522
A millisecond pulsar spinning 141 times per second: an old neutron star spun up again (“recycled”) by matter transferred from a companion. Period, spin-down, distance and orbit come from the ATNF Pulsar Catalogue; the beam geometry is illustrative.
| Type | Pulsar |
|---|---|
| Constellation | Sagittarius |
| Period | 7.101 ms (141 Hz) |
| Period derivative | 4.0×10⁻²⁰ s/s |
| Characteristic age | 2.8 billion years |
| Magnetic field | 5.4×10⁸ G |
| Spin-down luminosity | 4.4×10³³ erg/s |
| Dispersion measure | 192.6 pc/cm³ |
| Distance | 7,300 pc (23.8 thousand ly) |
| Location | in the globular cluster NGC6522 |
| Discovery | 2005 · misc |
| Source | ATNF Pulsar Catalogue |
| Right ascension (J2000) | 18h 03m 34.0s |
| Declination (J2000) | −30° 02′ 02″ |
In the sky
Visible from the whole Southern Hemisphere and north to latitude 60° N. South of latitude 60° 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 24 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 422 million years.