| 词条 | 2013 JX28 | ||||||||||||||||||||
| 释义 |
| minorplanet = yes | background = #FFC2E0 | name = {{mp|2013 JX|28}} | alt_names = {{mp|2006 KZ|39}} | discovery_ref = [1] | discoverer = Pan-STARRS 1 | discovered = 11 May 2013 (25 May 2006) | mp_category = Atira (Aten asteroid subclass) Near-Earth object[2] | semimajor = {{Convert|0.6008245|AU|Gm|abbr=on}} (a) | perihelion = {{Convert|0.2618791|AU|Gm|abbr=on}} (q) | aphelion = {{Convert|0.9397700|AU|Gm|abbr=on|lk=on}} (Q) | period = 0.47 yr (170.1 d) | eccentricity = 0.5641339 (e) | epoch = 13 January 2016 (JD 2457400.5) | inclination = 10.76379° (i) | asc_node = 39.96294° (Ω) | arg_peri = 354.88173° (ω) | mean_anomaly = 78.308816° (M) | satellites = | dimensions = ~300 m[3] | abs_magnitude = 20.1[2] | mean_motion = 2.116326°/day (n) | orbit_ref = [2] | observation_arc = 2893 days (7.92 yr) | uncertainty = 1 | moid = {{Convert|0.0685652|AU|Gm|abbr=on}} | jupiter_moid = {{Convert|4.48856|AU|Gm|abbr=on}} }} {{mp|2013 JX|28}} (also known as {{mp|2006 KZ|39}}) is an Atira asteroid, a type of Aten asteroid, that orbits entirely within Earth's orbit. It 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 {{convert|0.26|AU|km mi|abbr=on|lk=on}} from the Sun, but more than 100 minor planets have a smaller perihelion distance. Despite being officially classified as a near-Earth object, {{mp|2013 JX|28}} has a MOID (minimum orbit intersection distance) with Earth of ~0.067 AU,[2] making it highly unlikely to ever hit Earth. For comparison, the Moon orbits Earth at about 1/26th this distance. Physical characteristics{{mp|2013 JX|28}} has an absolute magnitude (H) of 20.1,[2] which means it is rather small, with the size being approximately 300 meters based on an assumed albedo of 0.15.[3] Its albedo is not known, so a size estimate is not certain. Assuming the albedo is between 0.05 and 0.25, it is somewhere between 260–580 meters in diameter.[4]163693 Atira, an asteroid with an orbit similar to {{mp|2013 JX|28}}, for comparison, has an absolute magnitude of 16.28 and is notably larger. Close approachesAs a near-Earth object,[2] {{mp|2013 JX|28}} often comes within {{convert|0.1|AU|km mi|abbr=on|lk=off}}] of Earth. On 29 April 2014, it traveled to 0.0843 AU from Earth, about 33 times further than the Moon. Below is a list of close approaches until 2100 where {{mp|2013 JX|28}} travels closer than 0.1 AU to Earth.
References1. ^{{cite web|title=List Of Aten Minor Planets (by designation)|url=http://www.minorplanetcenter.net/iau/lists/t_atens.html|work=IAU minor planet center|accessdate=9 February 2014}} 2. ^1 2 3 4 5 6 {{cite web|title=2013 JX28|url=http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2013JX28;cad=1|work=JPL small-body database|publisher=Jet Propulsion Laboratory|accessdate=3 April 2016}} 3. ^1 {{cite web|title=Conversion of Absolute Magnitude to Diameter |url=http://www.physics.sfasu.edu/astro/asteroids/sizemagnitude.html |work=SFA texas university |publisher=Physics and astronomy department |accessdate=9 February 2014 |deadurl=yes |archiveurl=https://web.archive.org/web/20110723191750/http://www.physics.sfasu.edu/astro/asteroids/sizemagnitude.html |archivedate=23 July 2011 |df= }} 4. ^{{Cite web |title=Absolute Magnitude (H) |publisher=NASA/JPL |url=http://neo.jpl.nasa.gov/glossary/h.html |accessdate=2014-02-15}} External links
4 : Apohele asteroids|Minor planet object articles (unnumbered)|Astronomical objects discovered in 2006|Astronomical objects discovered in 2013 |
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