About 2001 UP
2001 UP is a common neo. It swings within 0.63 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.
Common neo 21 EP
2001 UP
Position computed live · sbdb
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Live ephemeris
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Score breakdown
· 4 badgesCommon 22 pts → Uncommon
- Crosses Earth's orbit +8
- Aten: mostly inside Earth's orbit +8
- Near-Earth object +5
- Catalogue designation only +0
Total score 21
1 more point to reach Uncommon.
Badges
- Near-Earth object · +5
- Crosses Earth's orbit · +8
- Catalogue designation only
- Aten: mostly inside Earth's orbit · +8
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 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 0.63 AU of the Sun — inside the orbit of Venus.
- One lap. A single orbit around the Sun takes it about 303 days.
- How far it roams. Its orbit swings between 0.63 and 1.14 AU from the Sun.
Sense of scale
- Sense of scale. In everyday terms it is about 0.2 football pitches across.
Standing on it
- Don't jump. Escape velocity here is only around 0.02 m/s. A determined jump would launch you off it and into your own orbit around the Sun.
By the numbers
- Estimated size. Nobody has measured its size directly. Assuming it reflects light like a typical asteroid, its brightness implies something roughly 26 metres across.
Properties
- aphelion au
- 1.14
- designation
- 2001 UP
- eccentricity
- 0.2872
- full name
- (2001 UP)
- h mag
- 25.7
- inclination
- 7.69
- mean motion deg day
- 1.186
- moid au
- 0.0066
- name
- 2001 UP
- number only
- yes
- orbit class
- ATE
- perihelion au
- 0.63
- semi major au
- 0.8838
How to see it
Like any astronomical target, 2001 UP 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 2001 UP is a common neo
2001 UP scores 21 points on Spacedle's rarity scale, which places it in the common tier. Another 1 point would lift it into a rarer tier.
That score comes from 4 science badges — Near-Earth object, Crosses Earth's orbit, Catalogue designation only and Aten: mostly inside Earth's orbit — 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.