About 2011 JA
2011 JA is an uncommon neo. It swings within 0.844 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.
Uncommon neo 31 EP
2011 JA
Position computed live · sbdb
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Live ephemeris
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Score breakdown
· 5 badgesUncommon 34 pts → Rare
- Passes within two lunar distances of Earth's orbit +18
- Near-Earth object +5
- Apollo: crosses Earth's orbit +4
- Steeply tilted orbit (i > 40°) +4
- Catalogue designation only +0
Total score 31
3 more points to reach Rare.
Badges
- Near-Earth object · +5
- Catalogue designation only
- Apollo: crosses Earth's orbit · +4
- Passes within two lunar distances of Earth's orbit · +18
- Steeply tilted orbit (i > 40°) · +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 399 megatons — about 8 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 0.84 AU of the Sun — inside the orbit of Earth.
- One lap. A single orbit around the Sun takes it about 1.3 years.
- How far it roams. Its orbit swings between 0.84 and 1.53 AU from the Sun.
Sense of scale
- Sense of scale. In everyday terms it is about 1.7 football pitches across.
Standing on it
- Don't jump. Escape velocity here is only around 0.11 m/s. A determined jump would launch you off it and into your own orbit around the Sun.
Properties
- aphelion au
- 1.53
- designation
- 2011 JA
- eccentricity
- 0.2876
- full name
- (2011 JA)
- h mag
- 21.44
- inclination
- 41.62
- mean motion deg day
- 0.7641
- moid au
- 0.0005
- name
- 2011 JA
- number only
- yes
- orbit class
- APO
- perihelion au
- 0.844
- pha
- yes
- semi major au
- 1.185
How to see it
Like any astronomical target, 2011 JA 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 2011 JA is an uncommon neo
2011 JA 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 5 science badges — Near-Earth object, Catalogue designation only, Apollo: crosses Earth's orbit, Passes within two lunar distances of Earth's orbit and Steeply tilted orbit (i > 40°) — 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.