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Epic pulsar 62 EP

J1748-3009

RA 267.0990° · Dec -30.1531° · pulsar

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Score breakdown

· 4 badges
62 pts · Epic
Epic 78 pts → Anomaly
  • Pulsar +22
  • Millisecond pulsar +20
  • Binary pulsar +12
  • Deeply embedded (high DM) +8
Total score 62

16 more points to reach Anomaly.

Badges

  • Pulsar · +22
  • Millisecond pulsar · +20
  • Binary pulsar · +12
  • Deeply embedded (high DM) · +8

Trivia

Hard to believe

  • Surface speed. Its equator is moving at roughly 2% of the speed of light. Spin it much faster and it would tear itself apart.
  • Better than a clock. Millisecond pulsars keep time so well that a network of them is being used as a galaxy-sized detector for gravitational waves — more stable over decades than the best atomic clocks.

Handle with care

  • Its gravity. Surface gravity is around 190 billion times Earth's. A fall of one metre would end at roughly a tenth of the speed of light.

What it actually is

  • What it is. The collapsed core of a star that exploded: about one and a half Suns of matter crushed into a ball the size of a city, held up only by the refusal of neutrons to be squeezed further.
  • Reading the fog. Its dispersion measure is 420 — a count of the free electrons in every column of space between here and there. Those electrons slow the low-frequency pulses more than the high ones, and that lag is how its distance is worked out.
  • It has a partner. It orbits a companion star, and because its pulses are such a precise clock the orbit can be traced to extraordinary accuracy. A binary pulsar is how gravitational waves were first proven to be real, decades before one was directly detected.

Find it in the sky

  • Southern sky. It rides the southern half of the sky — an easier target the further south you are.
  • Best time of year. It stands highest in the middle of the night around June — that's when to go looking.

Properties

binary
yes
dm
420.2
name
J1748-3009
period ms
9.684

Nearby objects

About J1748-3009

J1748-3009 is an epic pulsar. It spins once every 9.684 ms and has a dispersion measure of 420.2 pc cm⁻³.

The collapsed core of a star that exploded: about one and a half Suns of matter crushed into a ball the size of a city, held up only by the refusal of neutrons to be squeezed further.

How to see it

Like any astronomical target, J1748-3009 is best seen from a dark site away from city lights, and when it is above the horizon depends on your latitude and the time of year. The visibility panel above works out tonight's viewing window for your saved location.

Why J1748-3009 is an epic pulsar

J1748-3009 scores 62 points on Spacedle's rarity scale, which places it in the epic tier. Another 16 points would lift it into a rarer tier.

That score comes from 4 science badges — Pulsar, Millisecond pulsar, Binary pulsar and Deeply embedded (high DM) — each earned for a real, measurable property of the object. Rarity on Spacedle is never random: the more remarkable an object's astrophysics, the more badges it collects, the higher it scores, and the rarer it ranks.