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Score breakdown
· 7 badges
52 pts · Epic
Epic78 pts → Anomaly
Large body (100-500 km)+12
Primitive outer-belt type+12
Darker than charcoal+10
Notably bright (low H)+8
Has a proper name+8
Asteroid+1
Main-belt asteroid+1
Total score52
26 more points to reach Anomaly.
Badges
🪨Asteroid· +1
🗿Large body (100-500 km)· +12
💡Notably bright (low H)· +8
🏷️Has a proper name· +8
🥌Main-belt asteroid· +1
🕶️Darker than charcoal· +10
🦖Primitive outer-belt type· +12
✨ Trivia
What it actually is
🛸Its orbit family. A main-belt asteroid, one of millions circling between Mars and Jupiter. Despite the films, the belt is so empty that every spacecraft sent through it has crossed without aiming for anything.
🌞Closest approach. At its nearest it comes within 2.64 AU of the Sun — inside the orbit of Jupiter.
🔁One lap. A single orbit around the Sun takes it about 4.6 years.
🥏How far it roams. Its orbit swings between 2.64 and 2.85 AU from the Sun.
Sense of scale
🧱Sense of scale. In everyday terms it is about 6× the length of Manhattan island.
🚶Walk around it. Walking its equator at a steady pace, eight hours a day, would take about 10.1 days.
Standing on it
🥶Sunlight there. Even at its closest the sunlight is only about 14% as strong as Earth's.
By the numbers
📐Size. Roughly 129 km across.
Properties
albedo
0.047
aphelion au
2.85
designation
308
diameter km
128.578
eccentricity
0.0382
full name
308 Polyxo (A891 FA)
h mag
8.17
inclination
4.36
mean motion deg day
0.2163
moid au
1.63
name
Polyxo
named
yes
orbit class
MBA
perihelion au
2.644
rotation period h
12.031
semi major au
2.749
spec taxonomy
T
spect
T
About Polyxo
Polyxo is an epic asteroid. It has spectral type T and swings within 2.644 AU of the Sun at perihelion.
A main-belt asteroid, one of millions circling between Mars and Jupiter. Despite the films, the belt is so empty that every spacecraft sent through it has crossed without aiming for anything.
How to see it
Like any astronomical target, Polyxo 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 Polyxo is an epic asteroid
Polyxo scores 52 points on Spacedle's rarity scale, which places it in the epic tier. Another 26 points would lift it into a rarer tier.
That score comes from 7 science badges — Asteroid, Large body (100-500 km), Notably bright (low H), Has a proper name, Main-belt asteroid, Darker than charcoal and Primitive outer-belt type — 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.