This object moves — fetching its current position…
Score breakdown
· 6 badges
37 pts · Rare
Rare50 pts → Epic
Passes within two lunar distances of Earth's orbit+18
Carbonaceous — as old as the solar system+6
Near-Earth object+5
Tiny fragment (<1 km)+4
Apollo: crosses Earth's orbit+4
Catalogue designation only+0
Total score37
13 more points to reach Epic.
Badges
🌠Near-Earth object· +5
🤏Tiny fragment (<1 km)· +4
🔢Catalogue designation only
🏛️Apollo: crosses Earth's orbit· +4
🪡Passes within two lunar distances of Earth's orbit· +18
🖤Carbonaceous — as old as the solar system· +6
✨ 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 4165 megatons — about 83.3 times the largest bomb ever detonated.
What it actually is
🛸Its orbit family. An Apollo-class object: its orbit is wider than Earth's but crosses it. Most known Earth-crossers belong to this family.
🌞Closest approach. At its nearest it comes within 0.66 AU of the Sun — inside the orbit of Venus.
🔁One lap. A single orbit around the Sun takes it about 1.2 years.
🥏How far it roams. Its orbit swings between 0.66 and 1.66 AU from the Sun.
Sense of scale
🧱Sense of scale. In everyday terms it is about 3.8 football pitches across.
Standing on it
🦘Don't jump. Escape velocity here is only around 0.24 m/s. A determined jump would launch you off it and into your own orbit around the Sun.
Properties
aphelion au
1.65
designation
308635
diameter km
0.4
eccentricity
0.4306
full name
308635 (2005 YU55)
h mag
21.91
inclination
0.34
mean motion deg day
0.7922
moid au
0.0004
name
(308635) 2005 YU55
number only
yes
orbit class
APO
perihelion au
0.659
pha
yes
rotation period h
18
semi major au
1.157
spec taxonomy
C
spect
C
About (308635) 2005 YU55
(308635) 2005 YU55 is a rare neo. It has spectral type C and swings within 0.659 AU of the Sun at perihelion.
An Apollo-class object: its orbit is wider than Earth's but crosses it. Most known Earth-crossers belong to this family.
How to see it
Like any astronomical target, (308635) 2005 YU55 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 (308635) 2005 YU55 is a rare neo
(308635) 2005 YU55 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 6 science badges — Near-Earth object, Tiny fragment (<1 km), Catalogue designation only, Apollo: crosses Earth's orbit, Passes within two lunar distances of Earth's orbit and Carbonaceous — as old as the solar system — 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.