About 2008 US4
2008 US4 is an uncommon neo. It swings within 0.858 AU of the Sun at perihelion.
Its orbit genuinely intersects Earth's track around the Sun. The two paths cross; only the timing keeps them apart.
Uncommon neo 31 EP
2008 US4
Position computed live · sbdb
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Live ephemeris
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Score breakdown
· 6 badgesUncommon 34 pts → Rare
- Darker than charcoal +10
- Crosses Earth's orbit +8
- Near-Earth object +5
- Tiny fragment (<1 km) +4
- Apollo: crosses Earth's orbit +4
- Catalogue designation only +0
Total score 31
3 more points to reach Rare.
Badges
- Near-Earth object · +5
- Tiny fragment (<1 km) · +4
- Crosses Earth's orbit · +8
- Catalogue designation only
- Apollo: crosses Earth's orbit · +4
- Darker than charcoal · +10
Trivia
What makes it special
- It crosses our path. Its orbit genuinely intersects Earth's track around the Sun. The two paths cross; only the timing keeps them apart.
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 0.86 AU of the Sun — inside the orbit of Earth.
- One lap. A single orbit around the Sun takes it about 3.6 years.
- How far it roams. Its orbit swings between 0.86 and 3.81 AU from the Sun.
Sense of scale
- Sense of scale. In everyday terms it is about 4.9 football pitches across.
Standing on it
- Don't jump. Escape velocity here is only around 0.31 m/s. A determined jump would launch you off it and into your own orbit around the Sun.
By the numbers
- Size. Roughly 516 metres across.
Properties
- albedo
- 0.029
- aphelion au
- 3.81
- designation
- 2008 US4
- diameter km
- 0.516
- eccentricity
- 0.6326
- full name
- (2008 US4)
- h mag
- 20.96
- inclination
- 13.18
- mean motion deg day
- 0.276
- moid au
- 0.08
- name
- 2008 US4
- number only
- yes
- orbit class
- APO
- perihelion au
- 0.858
- rotation period h
- 5.2
- semi major au
- 2.336
How to see it
Like any astronomical target, 2008 US4 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 2008 US4 is an uncommon neo
2008 US4 scores 31 points on Spacedle's rarity scale, which places it in the uncommon tier. Another 3 points would lift it into a rarer tier.
That score comes from 6 science badges — Near-Earth object, Tiny fragment (<1 km), Crosses Earth's orbit, Catalogue designation only, Apollo: crosses Earth's orbit and Darker than charcoal — 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.