← Back to dex - Centaur: adrift between the giants +20
- Large body (100-500 km) +12
- Notably bright (low H) +8
- Has a proper name +8
- Kuiper-belt object +5
Total score 53
25 more points to reach Anomaly.
Badges
- ❄️ Kuiper-belt object · +5
- 🗿 Large body (100-500 km) · +12
- 💡 Notably bright (low H) · +8
- 🏷️ Has a proper name · +8
- 🦌 Centaur: adrift between the giants · +20
✨ Trivia
What it actually is
- 🛸 Its orbit family. A centaur, wandering between the orbits of Jupiter and Neptune on a path nothing can stabilise. Half asteroid and half comet, and gone from this orbit within a few million years.
- 🌞 Closest approach. At its nearest it comes within 13.19 AU of the Sun — inside the orbit of Uranus.
- 🔁 One lap. A single orbit around the Sun takes it about 67.6 years.
- 🥏 How far it roams. Its orbit swings between 13.19 and 20.01 AU from the Sun.
Sense of scale
- 🧱 Sense of scale. In everyday terms it is about 8.7× the length of Manhattan island.
- 🚶 Walk around it. Walking its equator at a steady pace, eight hours a day, would take about 14.7 days.
By the numbers
- 📐 Size. Roughly 188 km across.
What's in a name
- 🏷️ Named. Notable enough to have earned a proper name, not just a catalogue number.
Properties
- albedo
- 0.05
- aphelion au
- 20.02
- designation
- 54598
- diameter km
- 187.5
- eccentricity
- 0.2056
- full name
- 54598 Bienor (2000 QC243)
- h mag
- 7.49
- inclination
- 20.72
- mean motion deg day
- 0.0146
- moid au
- 12.2
- name
- Bienor
- named
- yes
- orbit class
- CEN
- perihelion au
- 13.189
- rotation period h
- 9.14
- semi major au
- 16.6
About Bienor
Bienor is an epic kbo. It swings within 13.189 AU of the Sun at perihelion.
A centaur, wandering between the orbits of Jupiter and Neptune on a path nothing can stabilise. Half asteroid and half comet, and gone from this orbit within a few million years.
How to see it
Like any astronomical target, Bienor 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. Because it moves against the background stars, the live position panel on this page tracks where it is right now. The visibility panel above works out tonight's viewing window for your saved location.
Why Bienor is an epic kbo
Bienor scores 53 points on Spacedle's rarity scale, which places it in the epic tier. Another 25 points would lift it into a rarer tier.
That score comes from 5 science badges — Kuiper-belt object, Large body (100-500 km), Notably bright (low H), Has a proper name and Centaur: adrift between the giants — 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.