← Back to dex
Epic pulsar 54 EP

J1221-0633

RA 185.3532° · Dec -6.5644° · pulsar

Loading sky survey…
🌌 View in 3D star map
Tonight’s visibility

Computing the sky for your location…

Score breakdown

· 3 badges
54 pts · Epic
Epic 68 pts → Anomaly
  • Pulsar +22
  • Millisecond pulsar +20
  • Binary pulsar +12
Total score 54

14 more points to reach Anomaly.

Badges

  • Pulsar · +22
  • Millisecond pulsar · +20
  • Binary pulsar · +12

Trivia

By the numbers

  • Spin. It whirls around 517 times every second.
  • Density. A sugar-cube of its core would weigh about a billion tonnes.

Properties

binary
yes
bsurf
102154164.4
dm
16.4324
name
J1221-0633
period ms
1.9345

About J1221-0633

J1221-0633 is an epic pulsar. It spins once every 1.935 ms, has a dispersion measure of 16.43 pc cm⁻³ and carries a surface magnetic field around 102,154,164 G.

It whirls around 517 times every second.

How to see it

Like any astronomical target, J1221-0633 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 J1221-0633 is an epic pulsar

J1221-0633 scores 54 points on Spacedle's rarity scale, which places it in the epic tier. Another 14 points would lift it into a rarer tier.

That score comes from 3 science badges — Pulsar, Millisecond pulsar and Binary pulsar — 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.

spacedle A daily roll through the real universe. © 2026 spacedle. Buy me a coffee

Sky imagery and survey data courtesy of Aladin Lite & CDS, Strasbourg. Object data from the NASA Exoplanet Archive, JPL Small-Body Database, and the ATNF Pulsar Catalogue.