This object moves — fetching its current position…
Score breakdown
· 6 badges
35 pts · Rare
Rare50 pts → Epic
Potentially hazardous+12
Brilliantly reflective surface+10
Near-Earth object+5
Tiny fragment (<1 km)+4
Amor: shadows Earth's orbit from outside+4
Catalogue designation only+0
Total score35
15 more points to reach Epic.
Badges
🌠Near-Earth object· +5
⚠️Potentially hazardous· +12
🤏Tiny fragment (<1 km)· +4
🔢Catalogue designation only
💘Amor: shadows Earth's orbit from outside· +4
🪙Brilliantly reflective surface· +10
✨ 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 4551 megatons — about 91 times the largest bomb ever detonated.
What it actually is
🛸Its orbit family. An Amor-class object. It approaches Earth's orbit from outside without ever crossing it — named for the asteroid Amor, which swept past at 16 million km in 1932.
🌞Closest approach. At its nearest it comes within 1.04 AU of the Sun — inside the orbit of Mars.
🔁One lap. A single orbit around the Sun takes it about 2.6 years.
🥏How far it roams. Its orbit swings between 1.04 and 2.75 AU from the Sun.
Sense of scale
🧱Sense of scale. In everyday terms it is about 3.9 football pitches across.
Standing on it
🦘Don't jump. Escape velocity here is only around 0.25 m/s. A determined jump would launch you off it and into your own orbit around the Sun.
Properties
albedo
0.415
aphelion au
2.75
designation
391211
diameter km
0.412
eccentricity
0.4495
full name
391211 (2006 HZ51)
h mag
18.48
inclination
12.4
mean motion deg day
0.3769
moid au
0.0362
name
(391211) 2006 HZ51
number only
yes
orbit class
AMO
perihelion au
1.045
pha
yes
semi major au
1.898
About (391211) 2006 HZ51
(391211) 2006 HZ51 is a rare neo. It swings within 1.045 AU of the Sun at perihelion.
An Amor-class object. It approaches Earth's orbit from outside without ever crossing it — named for the asteroid Amor, which swept past at 16 million km in 1932.
How to see it
Like any astronomical target, (391211) 2006 HZ51 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 (391211) 2006 HZ51 is a rare neo
(391211) 2006 HZ51 scores 35 points on Spacedle's rarity scale, which places it in the rare tier. Another 15 points would lift it into a rarer tier.
That score comes from 6 science badges — Near-Earth object, Potentially hazardous, Tiny fragment (<1 km), Catalogue designation only, Amor: shadows Earth's orbit from outside and Brilliantly reflective surface — 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.