| 词条 | 2012 BX34 |
| 释义 |
| minorplanet = yes | background = #FFC2E0 | name = {{mp|2012 BX|34}} | image = | caption = | discovery_ref = | discoverer = Catalina Sky Survey | discovered = 25 January 2012 | mp_category = Earth-crosser (Aten asteroid) | orbit_ref = [2] | epoch = 13 January 2016 (JD 2457400.5) | aphelion = {{Convert|1.0332|AU|Gm|abbr=on|lk=on}} (Q) | perihelion = {{Convert|0.48892|AU|Gm|abbr=on}} (q) | semimajor = {{Convert|0.76105|AU|Gm|abbr=on}} (a) | eccentricity = 0.35757 (e) | period = 0.66 yr (242.5 d) | avg_speed = 1.48200135°/day | inclination = 10.527° (i) | asc_node = 306.74° (Ω) | mean_anomaly = 211.76° (M) | arg_peri = 335.834° (ω) | dimensions = ~{{convert|8|m|ft|sp=us}}[3][4] | mass = | density = | surface_grav = | escape_velocity = | rotation = {{Convert|1.80828|h|d|abbr=on|lk=on}}[2] | albedo = | spectral_type = | magnitude = ~13.9[6] to 30.3 | abs_magnitude = 27.6[2] | mean_motion = 1.4845°/day (n) | uncertainty = 3 | moid = {{Convert|0.000288322|AU|km|abbr=on}} | jupiter_moid = {{Convert|4.09701|AU|Gm|abbr=on}} }}{{mp|2012 BX|34}} is a small Aten asteroid that made one of the closest recorded asteroid close approaches of Earth on 27 January 2012. It passed within {{convert|0.0004371|AU|km mi|abbr=on|lk=on}} of Earth during its closest approach at 15:25 GMT.[8] {{mp|2012 BX|34}} measures around {{convert|8|m|ft|sp=us}} across; if it had impacted in 2012, it would have been too small to pass through Earth's atmosphere intact.[9] During its 2012 close approach to Earth, {{mp|2012 BX|34}} had a brightest apparent magnitude of about 13.9,[6] making it about as bright as the dwarf planet Pluto. By 25 February 2012, it had dimmed to magnitude 30. During its close approach of {{convert|0.0246|AU|km mi|abbr=on|lk=off}} on 28 January 2014,[8] it will only reach a magnitude of about 23.[13] {{mp|2012 BX|34}} has been observed in more detail using radar astronomy.[14] See also
References1. ^1 2 3 {{cite web |date=27 January 2012 |title=JPL Small-Body Database Browser: (2012 BX34) |url=http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2012BX34 |publisher=Jet Propulsion Laboratory |accessdate=1 April 2016}} [1][2][3][4][5][6][7][8]2. ^1 2 {{cite web |date=27 January 2012 |title=JPL Close-Approach Data: (2012 BX34) |url=http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2012BX34;cad=1#cad |accessdate=29 January 2012}} 3. ^1 {{cite web |date=26 January 2012 |title=2012 BX34 Goldstone Radar Observations Planning |publisher=NASA/JPL Asteroid Radar Research |author=Dr. Lance A. M. Benner |url=http://echo.jpl.nasa.gov/asteroids/2012BX34/2012BX34_planning.html |accessdate=29 January 2012}} 4. ^1 {{cite web |date=27 January 2012 |title=Images taken by legendary comet and asteroid hunter Rob McNaught tonight using T17 in Spain |publisher=iTelescope |url=http://itelescope.squarespace.com/home/2012/1/27/neo-bx34-a-close-encounter.html |accessdate=29 January 2012}} 5. ^1 2 {{cite web |title=NEODyS 2012BX34 Ephemerides for 27 January 2012 |publisher=AstDyS-2 (Asteroids – Dynamic Site) |url=http://newton.dm.unipi.it/neodys/index.php?pc=1.1.3.1&n=2012BX34&oc=500&y0=2012&m0=1&d0=27&h0=0&mi0=0&y1=2012&m1=1&d1=28&h1=0&mi1=0&ti=1&tiu=hours |accessdate=29 January 2012}} 6. ^1 {{cite web |title=NEODyS 2012BX34 Ephemerides for 28 January 2014 |publisher=AstDyS-2 (Asteroids – Dynamic Site) |url=http://newton.dm.unipi.it/neodys/index.php?pc=1.1.3.1&n=2012BX34&oc=500&y0=2014&m0=1&d0=01&h0=0&mi0=0&y1=2014&m1=2&d1=14&h1=0&mi1=0&ti=1.0&tiu=days |accessdate=30 January 2012}} 7. ^1 {{cite web |date=26 January 2012 |title=It wouldn't get through our atmosphere intact even if it dared to try |publisher=NASA/JPL Near-Earth Object Program Office |author=AsteroidWatch |url=https://twitter.com/AsteroidWatch/status/162638876991692800 |accessdate=29 January 2012}} 8. ^1 {{cite web |title=Radar-Detected Asteroids and Comets |publisher=NASA/JPL Asteroid Radar Research |url=http://echo.jpl.nasa.gov/asteroids/ |accessdate=21 March 2012}} }} External links
4 : Aten asteroids|Minor planet object articles (unnumbered)|Near-Earth objects in 2012|Astronomical objects discovered in 2012 |
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