2013 JX28

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2013 JX28 (2006 KZ39)
Discovery[1]
Discovered by Pan-STARRS 1
Discovery date May 11th, 2013 (May 25th, 2006)
Designations
Minor planet category Atira (Aten asteroid subclass)
Near-Earth object[2]
Orbital characteristics
Epoch 2014-dec-9 (JD 2457000.5)
Aphelion

0.9397696

±0.000 000 041 742
Perihelion

0.2619078 (q)

±0.000 000 112 300

0.6008387 (a)

±0.000 000 026 687
Eccentricity

0.5640963

±0.000 000 180 300
0.47 years (171.6 days)
311.78093°
Inclination

10.76338°

±0.000 143 670

39.96605°

±0.000 110 330

354.87858°

±0.000 145 050
Known satellites none
Physical characteristics
Dimensions ~300 m[3]
20.1[2]

2013 JX28 (also known as 2006 KZ39) is an Atira asteroid, a type of Aten asteroid, that orbits entirely within Earth's orbit. The asteroid orbits very close to the sun, having the second smallest Semi-major axis of any minor planet in the Solar System. At its closest, it is only 0.26 astronomical units away from the sun, having the 32nd closest perihelion of any minor planet.

Despite being officially classified as a near-Earth object, the asteroid has a MOID (minimum orbit intersection distance) with Earth of ~0.069 AU, making it highly unlikely to ever hit Earth. For comparison, the Moon orbits Earth at about 1/30th this distance.

Physical characteristics[edit]

The asteroid has an absolute magnitude (H) of 20.1.[2] So the asteroid is fairly small, with the size being approximately 300 meters based on an assumed albedo of 0.15.[3] The albedo is not known, so a size estimate is not certain. Assuming the albedo is between 0.05 and 0.25, the asteroid is somewhere between 260–580 meters in diameter.[4]

163693 Atira, an asteroid with an orbit similar to 2013 JX28, for comparison, has an absolute magnitude of 16.28 and is notably larger in size.

Close approaches[edit]

Despite not being a near-Earth object, 2013 JX28 often comes within 0.1 AU of Earth, which is fairly close. On April 29th, 2014, the asteroid traveled to 0.0843 AU from Earth, about 42 times further than the Moon. Here is a list of close approaches until 2100 where 2013 JX28 travels closer than 0.1 AU to earth.

date distance (AU)[2]
2000-04-20 0.0913
2007-04-25 0.0682
2014-04-29 0.0843
2034-04-21 0.0888
2041-04-25 0.0680
2048-04-29 0.0849
2068-04-21 0.0863
2075-04-26 0.0676
2082-04-30 0.0890

References[edit]

  1. ^ "List Of Aten Minor Planets (by designation)". IAU minor planet center. Retrieved 9 February 2014. 
  2. ^ a b c d "2013 JX28". JPL small-body database. Jet Propulsion Laboratory. Retrieved 9 February 2014. 
  3. ^ a b "Conversion of Absolute Magnitude to Diameter". SFA texas university. Physics and astronomy department. Retrieved 9 February 2014. 
  4. ^ "Absolute Magnitude (H)". NASA/JPL. Retrieved 2014-02-15.