2013 BL₇₆ is a trans-Neptunian object and centaur[4] from the scattered disk and Inner Oort cloud approximately 30 kilometers in diameter.

2013 BL₇₆

The orbits of some of the most distant minor planets, 2013 BL76 at top left
Discovery[1][2][3]
Discovered by	Mt. Lemmon Survey
Discovery date	20 January 2013
Designations
MPC designation	2013 BL76
Minor planet category	TNO[1] Centaur (DES)[4]  damocloid distant[5]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 1
Observation arc	1.88 yr (687 days)
Aphelion	2151.77 AU ~1920 AU[lower-alpha 1]
Perihelion	8.3622 AU
Semi-major axis	1080.07 AU ~964 AU[lower-alpha 1]
Eccentricity	0.9923
Orbital period (sidereal)	35,496 yr (12,965,058 d) ~29900 yr[lower-alpha 1] last perihelion: 2012-10-27
Mean anomaly	0.0493°
Mean motion	0° 0m 0s / day
Inclination	98.613°
Longitude of ascending node	180.20°
Argument of perihelion	165.96°
Physical characteristics
Dimensions	~15–40 km[6] 30–40 km (at 0.1–0.05)
Apparent magnitude	22.1[7]
Absolute magnitude (H)	10.8[1][5]

Using an epoch of February 2017, it is the minor planet with the 5th largest heliocentric semi-major axis in the Solar System (larger ones include 2014 FE72, 2012 DR30, and 2005 VX3).[8] 2013 BL₇₆ has a barycentric semi-major axis of ~964 AU,[9][lower-alpha 1] which is the third largest barycentric semi-major axis of any minor planet.

Possible comet

With an absolute magnitude (H) of 10.8[5] and an unknown albedo, the object has an estimated diameter of 15–40 km.[6] Since it has not been seen out-gassing, it is not known if it is a comet or not. It might also be a damocloid, a type of minor planet that was originally a comet but lost most of its near-surface volatile materials after numerous orbits around the Sun. It also might be a dormant comet that simply has not been seen outgassing.

Orbit

2013 BL₇₆ came to perihelion 8.3 AU from the Sun on 27 October 2012, when it reached an apparent magnitude of about 20.[2] In 1927, when it was 100 AU from the Sun, it had an apparent magnitude of about 30.8.[11] For comparison dwarf planet 90377 Sedna had an apparent magnitude of 21.7 when it was 100 AU from the Sun.[12] It comes to opposition at the start of September.

It will not be 50 AU from the Sun until 2045. After leaving the planetary region of the Solar System, 2013 BL₇₆ will have a barycentric aphelion of 1920 AU with an orbital period of 29900 years.[lower-alpha 1]

The orbit of 2013 BL₇₆ currently comes closer to Saturn than any of the other giant planets.[5] In a 10 million year integration of the orbit, the nominal (best-fit) orbit acquires a perihelion point of 0.5 AU (inside the orbit of Venus), and one of the 3-sigma clones acquires a perihelion point of only 0.008 AU (1,200,000 km).[4]

2013 BL₇₆ travels in a technically retrograde orbit around the Sun. It is actually orbiting in a plane nearly perpendicular to that of the ecliptic. It has the 55th highest inclination of any known asteroid, after 2010 GW₁₄₇ and before 2014 HS₁₅₀.

Comparison

Largest semimajor axes of minor planets

Notes

References

External links

• Webcite archive of Epoch 2015-06-27 with aphelion (Q) of 2467 AU
• 2013 BL76 at AstDyS-2, Asteroids—Dynamic Site
  • Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
• 2013 BL76 at the JPL Small-Body Database
  • Close approach · Discovery · Ephemeris · Orbit diagram · Orbital elements · Physical parameters

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