About (5131) 1990 BG
(5131) 1990 BG is a common neo. It has spectral type S and swings within 0.641 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
(5131) 1990 BG
Position computed live · sbdb
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Live ephemeris
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Score breakdown
· 5 badgesCommon 22 pts → Uncommon
- Crosses Earth's orbit +8
- Near-Earth object +5
- Apollo: crosses Earth's orbit +4
- Stony asteroid +4
- 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
- Apollo: crosses Earth's orbit · +4
- Stony asteroid · +4
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 0.64 AU of the Sun — inside the orbit of Venus.
- One lap. A single orbit around the Sun takes it about 1.8 years.
- How far it roams. Its orbit swings between 0.64 and 2.33 AU from the Sun.
Sense of scale
- Sense of scale. In everyday terms it is roughly 0.4× the height of Mount Everest.
By the numbers
- Estimated size. Nobody has measured its size directly. Assuming it reflects light like a typical asteroid, its brightness implies something roughly 3.9 km across.
What's in a name
- Designation. Known only by its catalogue designation — no name yet.
Properties
- aphelion au
- 2.33
- designation
- 5131
- eccentricity
- 0.5688
- full name
- 5131 (1990 BG)
- h mag
- 14.82
- inclination
- 36.45
- mean motion deg day
- 0.544
- moid au
- 0.274
- name
- (5131) 1990 BG
- number only
- yes
- orbit class
- APO
- perihelion au
- 0.641
- rotation period h
- 37.2
- semi major au
- 1.486
- spec taxonomy
- S
- spect
- S
How to see it
Like any astronomical target, (5131) 1990 BG 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 (5131) 1990 BG is a common neo
(5131) 1990 BG 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, Crosses Earth's orbit, Catalogue designation only, Apollo: crosses Earth's orbit and Stony asteroid — 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.