This object moves — fetching its current position…
Score breakdown
· 5 badges
41 pts · Rare
Rare50 pts → Epic
Centaur: adrift between the giants+20
Retrograde orbit+8
Notably bright (low H)+8
Kuiper-belt object+5
Catalogue designation only+0
Total score41
9 more points to reach Epic.
Badges
❄️Kuiper-belt object· +5
⏪Retrograde orbit· +8
💡Notably bright (low H)· +8
🔢Catalogue designation only
🦌Centaur: adrift between the giants· +20
✨ Trivia
Hard to believe
🔄Against the traffic. It goes round the Sun backwards, against the direction every planet and almost everything else travels.
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 7.02 AU of the Sun — inside the orbit of Saturn.
🔁One lap. A single orbit around the Sun takes it about 116 years.
🥏How far it roams. Its orbit swings between 7.02 and 40.46 AU from the Sun.
Sense of scale
🧱Sense of scale. In everyday terms it is roughly 2.1× the height of Mount Everest.
🚶Walk around it. Walking its equator at a steady pace, eight hours a day, would take about 1.4 days.
By the numbers
📐Estimated size. Nobody has measured its size directly. Assuming it reflects light like a typical asteroid, its brightness implies something roughly 18.4 km across.
Properties
aphelion au
40.45
designation
2025 MU88
eccentricity
0.7042
full name
(2025 MU88)
h mag
11.43
inclination
128.7
mean motion deg day
0.0085
moid au
6.04
name
2025 MU88
number only
yes
orbit class
CEN
perihelion au
7.023
semi major au
23.74
About 2025 MU88
2025 MU88 is a rare kbo. It swings within 7.023 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, 2025 MU88 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 2025 MU88 is a rare kbo
2025 MU88 scores 41 points on Spacedle's rarity scale, which places it in the rare tier. Another 9 points would lift it into a rarer tier.
That score comes from 5 science badges — Kuiper-belt object, Retrograde orbit, Notably bright (low H), Catalogue designation only 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.