This object moves — fetching its current position…
Score breakdown
· 5 badges
37 pts · Rare
Rare50 pts → Epic
Potentially hazardous+12
Has a proper name+8
Aten: mostly inside Earth's orbit+8
Near-Earth object+5
Stony asteroid+4
Total score37
13 more points to reach Epic.
Badges
🌠Near-Earth object· +5
⚠️Potentially hazardous· +12
🏷️Has a proper name· +8
⚱️Aten: mostly inside Earth's orbit· +8
🧗Stony asteroid· +4
✨ Trivia
Handle with care
🛡️What 'hazardous' means. 'Potentially hazardous' is bookkeeping, not a prediction: it means the orbit passes within 0.05 AU of Earth's and the body is big enough to matter. Nothing on that list is known to be on a collision course.
☄️If it ever hit. A rock this size arriving at a typical 20 km/s would release around 148.7 thousand megatons — enough to devastate a region the size of a small country.
What it actually is
🛸Its orbit family. An Aten-class object, spending most of its time inside Earth's orbit and crossing ours from the sunward side — which makes this family wretchedly hard to spot against the daylight.
🌞Closest approach. At its nearest it comes within 0.2 AU of the Sun — inside the orbit of Mercury.
🔁One lap. A single orbit around the Sun takes it about 188 days.
🥏How far it roams. Its orbit swings between 0.2 and 1.08 AU from the Sun.
Sense of scale
🧱Sense of scale. In everyday terms it is roughly 0.1× the height of Mount Everest.
Standing on it
🔥Sunlight there. At closest approach the Sun beats down about 25 times harder than it ever does on Earth.
Properties
aphelion au
1.08
designation
66391
diameter km
1.317
eccentricity
0.6884
full name
66391 Moshup (1999 KW4)
h mag
16.64
inclination
38.88
mean motion deg day
1.914
moid au
0.0132
name
Moshup
named
yes
orbit class
ATE
perihelion au
0.2
pha
yes
rotation period h
2.7645
semi major au
0.6424
spec taxonomy
S:
spect
S:
About Moshup
Moshup is a rare neo. It has spectral type S: and swings within 0.2 AU of the Sun at perihelion.
An Aten-class object, spending most of its time inside Earth's orbit and crossing ours from the sunward side — which makes this family wretchedly hard to spot against the daylight.
How to see it
Like any astronomical target, Moshup 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 Moshup is a rare neo
Moshup scores 37 points on Spacedle's rarity scale, which places it in the rare tier. Another 13 points would lift it into a rarer tier.
That score comes from 5 science badges — Near-Earth object, Potentially hazardous, Has a proper name, Aten: mostly inside Earth's orbit and Stony 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.