PSR B1257+12 / STELLAR DOSSIER

PSR B1257+12

2313.17 light-years from Sol

A millisecond pulsar whose radio pulses revealed an extraordinary planetary family.

Stellar view ↗

01
Artist’s impression of PSR B1257+12
Millisecond pulsar · neutron star

A stellar clock with worlds in its timing.

Rotation ↗

02
SPIN PERIOD6.2185 ms

160.8 rotations per second

Rounded radio timing period. The repeating beam sweeps past Earth as the neutron star rotates.

Evolution ↗

03
CURRENT PHASE

Rotation-powered neutron star.

  1. NOWRapid rotation
  2. ORIGINStellar remnant
  3. OUTLOOKGradual spin-down
A physical sequence, not a lifetime scale or a countdown.

Magnetosphere & radiation ↗

05
Conceptual artist’s impression of a pulsar. Beams and magnetic structure are visual explanations, not resolved visible-light features or measured geometry. No accretion disk is implied.A magnetic beacon ↗ ARTIST’S IMPRESSION · 3 VIEWS

Compact remnant ↗

06
DIAMETER

Not measured

The radius of this particular pulsar is not measured here. Neutron stars are typically tens of kilometres across; that general scale is not assigned as an observed diameter.

Pulsar emission ↗

07
ENERGY SOURCE

Rotation & magnetism

A spinning magnetic field accelerates particles and produces beamed radiation. The visible cones illustrate a radio-beam concept, not luminous structures photographed in space.

Sources ↗
PSR B1257+12

Instrument detail

Artist’s impression of PSR B1257+12

Artist’s impression · structure and color are illustrative.

The arrival time carries an orbit.

As planets tug on the pulsar, its changing position alters the distance each radio pulse travels to Earth. Repeated early and late arrivals reveal the orbital pattern. Interactions between the two larger planets provide additional mass constraints.

Planets beyond an ordinary sun.

The planets now called c and d were discovered in 1992. The much smaller inner planet b was reported in 1994. Historical labels A, B and C correspond to modern b, c and d; the letters must not be mixed.

A remnant with a second story.

This is a neutron-star remnant, not a hydrogen-fusing main-sequence star. Its fast rotation powers magnetospheric emission. How its planets formed remains a separate question; their existence does not prove they survived the original stellar explosion.

A distance measured by radio astrometry.

Very-long-baseline radio interferometry measured a parallax of 1.41 ± 0.08 milliarcseconds. Its inverse places the pulsar about 710 parsecs away; the displayed distance uses this adopted measurement.

A neutron star in perspective.

SPIN PERIOD
6.2185 ms
DIAMETER
Not measured
EFFECTIVE TEMPERATURE
Not assigned
ENERGY
Rotation-powered pulsar

The radius of this particular pulsar is not measured here. Neutron stars are typically tens of kilometres across; that general scale is not assigned as an observed diameter.

Rounded radio timing period. The repeating beam sweeps past Earth as the neutron star rotates.

A spinning magnetic field accelerates particles and produces beamed radiation. The visible cones illustrate a radio-beam concept, not luminous structures photographed in space.

The neutron star itself has extreme gravity, radiation and dense matter incompatible with known life. This does not establish the environments of its planets.

A close encounter with the remnant is not survivable without protection; an exact survival time is not meaningful.

Research · pulsar timing ↗

Rotation-powered neutron star.

  1. NOWRapid rotation
  2. ORIGINStellar remnant
  3. OUTLOOKGradual spin-down

A physical sequence, not a lifetime scale or a countdown.

Research ↗

This is a neutron-star remnant, not a hydrogen-fusing main-sequence star. Its fast rotation powers magnetospheric emission. How its planets formed remains a separate question; their existence does not prove they survived the original stellar explosion.

A rotating beacon

A spinning magnetic field accelerates particles and produces beamed radiation. The visible cones illustrate a radio-beam concept, not luminous structures photographed in space.

Radio pulses are produced in a magnetosphere. A photospheric size–temperature calculation cannot describe this beamed emission. No total luminosity comparison is assigned here.

Research ↗

The arrival time carries an orbit.

As planets tug on the pulsar, its changing position alters the distance each radio pulse travels to Earth. Repeated early and late arrivals reveal the orbital pattern. Interactions between the two larger planets provide additional mass constraints.

Planets beyond an ordinary sun.

The planets now called c and d were discovered in 1992. The much smaller inner planet b was reported in 1994. Historical labels A, B and C correspond to modern b, c and d; the letters must not be mixed.

A remnant with a second story.

This is a neutron-star remnant, not a hydrogen-fusing main-sequence star. Its fast rotation powers magnetospheric emission. How its planets formed remains a separate question; their existence does not prove they survived the original stellar explosion.

A distance measured by radio astrometry.

Very-long-baseline radio interferometry measured a parallax of 1.41 ± 0.08 milliarcseconds. Its inverse places the pulsar about 710 parsecs away; the displayed distance uses this adopted measurement.

Conceptual artist’s impression of a pulsar. Beams and magnetic structure are visual explanations, not resolved visible-light features or measured geometry. No accretion disk is implied.

A magnetic beacon

Conceptual artist’s impression of a pulsar. Beams and magnetic structure are visual explanations, not resolved visible-light features or measured geometry. No accretion disk is implied.

Conceptual artist’s impression of a pulsar. Beams and magnetic structure are visual explanations, not resolved visible-light features or measured geometry. No accretion disk is implied.

The sweep of the beams

Conceptual artist’s impression of a pulsar. Beams and magnetic structure are visual explanations, not resolved visible-light features or measured geometry. No accretion disk is implied.

Conceptual artist’s impression of a pulsar. Beams and magnetic structure are visual explanations, not resolved visible-light features or measured geometry. No accretion disk is implied.

A compact source in space

Conceptual artist’s impression of a pulsar. Beams and magnetic structure are visual explanations, not resolved visible-light features or measured geometry. No accretion disk is implied.

Stellar images are artistic interpretations, not resolved photographs of this star.