About (381677) 2009 BJ81
(381677) 2009 BJ81 is a common neo. It swings within 1.007 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.
Common neo 21 EP
(381677) 2009 BJ81
Position computed live · sbdb
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Live ephemeris
This object moves — fetching its current position…
Score breakdown
· 5 badgesCommon 22 pts → Uncommon
- Barely turning (over 100 hours) +8
- Near-Earth object +5
- Tiny fragment (<1 km) +4
- Apollo: crosses Earth's orbit +4
- Catalogue designation only +0
Total score 21
1 more point to reach Uncommon.
Badges
- Near-Earth object · +5
- Tiny fragment (<1 km) · +4
- Catalogue designation only
- Apollo: crosses Earth's orbit · +4
- Barely turning (over 100 hours) · +8
Trivia
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 1.01 AU of the Sun — inside the orbit of Mars.
- One lap. A single orbit around the Sun takes it about 2.5 years.
- How far it roams. Its orbit swings between 1.01 and 2.69 AU from the Sun.
Sense of scale
- Sense of scale. In everyday terms it is about 4.5 football pitches across.
Standing on it
- Don't jump. Escape velocity here is only around 0.28 m/s. A determined jump would launch you off it and into your own orbit around the Sun.
By the numbers
- Size. Roughly 472 metres across.
What's in a name
- Designation. Known only by its catalogue designation — no name yet.
Properties
- albedo
- 0.346
- aphelion au
- 2.7
- designation
- 381677
- diameter km
- 0.472
- eccentricity
- 0.4558
- full name
- 381677 (2009 BJ81)
- h mag
- 18.36
- inclination
- 5.84
- mean motion deg day
- 0.3913
- moid au
- 0.0984
- name
- (381677) 2009 BJ81
- number only
- yes
- orbit class
- APO
- perihelion au
- 1.007
- rotation period h
- 325
- semi major au
- 1.851
How to see it
Like any astronomical target, (381677) 2009 BJ81 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 (381677) 2009 BJ81 is a common neo
(381677) 2009 BJ81 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 5 science badges — Near-Earth object, Tiny fragment (<1 km), Catalogue designation only, Apollo: crosses Earth's orbit and Barely turning (over 100 hours) — 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.