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Score breakdown
· 6 badges
42 pts · Rare
Rare50 pts → Epic
Metal-rich asteroid+14
Darker than charcoal+10
Notably bright (low H)+8
Has a proper name+8
Asteroid+1
Main-belt asteroid+1
Total score42
8 more points to reach Epic.
Badges
🪨Asteroid· +1
💡Notably bright (low H)· +8
🏷️Has a proper name· +8
🥌Main-belt asteroid· +1
🕶️Darker than charcoal· +10
⚙️Metal-rich asteroid· +14
✨ 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 2.3 AU of the Sun — inside the orbit of Jupiter.
🔁One lap. A single orbit around the Sun takes it about 4.3 years.
🥏How far it roams. Its orbit swings between 2.3 and 2.97 AU from the Sun.
Sense of scale
🧱Sense of scale. In everyday terms it is about 3× the length of Manhattan island.
🚶Walk around it. Walking its equator at a steady pace, eight hours a day, would take about 5.1 days.
Standing on it
🥶Sunlight there. Even at its closest the sunlight is only about 19% as strong as Earth's.
By the numbers
📐Size. Roughly 65.5 km across.
Properties
albedo
0.048
aphelion au
2.97
designation
524
diameter km
65.527
eccentricity
0.1264
full name
524 Fidelio (A904 ED)
h mag
9.84
inclination
8.22
mean motion deg day
0.2303
moid au
1.33
name
Fidelio
named
yes
orbit class
MBA
perihelion au
2.303
rotation period h
14.198
semi major au
2.636
spec taxonomy
XC
spect
XC
About Fidelio
Fidelio is a rare asteroid. It has spectral type XC and swings within 2.303 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, Fidelio 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 Fidelio is a rare asteroid
Fidelio scores 42 points on Spacedle's rarity scale, which places it in the rare tier. Another 8 points would lift it into a rarer tier.
That score comes from 6 science badges — Asteroid, Notably bright (low H), Has a proper name, Main-belt asteroid, Darker than charcoal and Metal-rich asteroid — 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.