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The Managua explosion on 6 September 2014 may or may not have been created by a bolide that was missed by millions of people, but either way it was not caused by the close approach of 2014 RC.<ref name="NASA185"/>
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'''2014 RC''' is a small near-earth asteroid that made a close approach to Earth of {{convert|0.000267|AU|km mi|abbr=on|lk=on}} (0.1 lunar distances) around 18:02 UTC on 7 September 2014.<ref name="jpldata"/><ref name=closeapproachdate>{{cite web|title=NASA reports asteroid to pass close, but safely past Earth.|url=http://www.clarksvilleonline.com/2014/09/04/nasa-reports-small-asteroid-2014-rc-pass-close-safely-past-earth/|website=clarksvilleonline.com|publisher=Clarksville Online|accessdate=4 September 2014}}</ref><ref name="NASA-20140903" /> It is the [[List of notable asteroids#Fastest rotating objects|fastest rotating asteroid]] so far discovered. The asteroid briefly brightened to about [[apparent magnitude]] 11.5,<ref name="NEODyS2014"/> so it was not visible to the [[naked eye]] or common binoculars. At the peak brightness the asteroid had a [[declination]] of –47,<ref name="NEODyS2014"/> and was most easily visible over New Zealand. The asteroid is approximately the diameter of the [[Chelyabinsk meteor]],<ref name="NASA185"/> and passed almost as close to Earth as [[367943 Duende]] (2012 DA14) did in 2013. [[List of asteroid close approaches to Earth in 2014|During 2014]], asteroids [[2014 AA]] and {{mpl|2014 LY|21}} have come closer to Earth. 2014 RC was removed from the JPL [[Sentry (monitoring system)|Sentry Risk Table]] on 5 September 2014 and there are no known possible impact dates in the next 100 years.<ref name="removed"/> On 8 September 2115 the asteroid will pass about {{convert|0.0043|AU|km mi|abbr=on|lk=on}} from the moon.<ref name="jpldata"/> On 6–7 September 1973, the asteroid passed between {{convert|0.00076|AU|km mi|abbr=on|1k=off}} and {{convert|0.015|AU|km mi|abbr=on|1k=off}} from Earth.<ref name="jpldata"/>
'''2014 RC''' is a small near-earth asteroid that made a close approach to Earth of {{convert|0.000267|AU|km mi|abbr=on|lk=on}} (0.1 lunar distances) around 18:02 UTC on 7 September 2014.<ref name="jpldata"/><ref name=closeapproachdate>{{cite web|title=NASA reports asteroid to pass close, but safely past Earth.|url=http://www.clarksvilleonline.com/2014/09/04/nasa-reports-small-asteroid-2014-rc-pass-close-safely-past-earth/|website=clarksvilleonline.com|publisher=Clarksville Online|accessdate=4 September 2014}}</ref><ref name="NASA-20140903" /> It is the [[List of notable asteroids#Fastest rotating objects|fastest rotating asteroid]] so far discovered. The asteroid briefly brightened to about [[apparent magnitude]] 11.5,<ref name="NEODyS2014"/> so it was not visible to the [[naked eye]] or common [[binoculars]]. At the peak brightness the asteroid had a [[declination]] of –47,<ref name="NEODyS2014"/> and was most easily visible over New Zealand. The asteroid is approximately the diameter of the [[Chelyabinsk meteor]],<ref name="NASA185"/> and passed almost as close to Earth as [[367943 Duende]] (2012 DA14) did in 2013. [[List of asteroid close approaches to Earth in 2014|During 2014]], asteroids [[2014 AA]] and {{mpl|2014 LY|21}} have come closer to Earth. 2014 RC was removed from the JPL [[Sentry (monitoring system)|Sentry Risk Table]] on 5 September 2014 and there are no known possible impact dates in the next 100 years.<ref name="removed"/> On 8 September 2115 the asteroid will pass about {{convert|0.0043|AU|km mi|abbr=on|lk=on}} from the moon.<ref name="jpldata"/> On 6–7 September 1973, the asteroid passed between {{convert|0.00076|AU|km mi|abbr=on|1k=off}} and {{convert|0.015|AU|km mi|abbr=on|1k=off}} from Earth.<ref name="jpldata"/>
{{Auto images |title=<center>Asteroid 2014 RC<ref name="NASA-20140903" /></center> |float=center |total width=800 |width1=1920 |height1=1080 |image1=Asteroid-2014RC-20140903b.jpg |caption1=Path around the Sun - 3 September 2014. |width2=1024 |height2=768 |image2=Asteroid-2014RC-20140903a.jpg |caption2=Path near the Earth - 7 September 2014. }}
{{Auto images |title=<center>Asteroid 2014 RC<ref name="NASA-20140903" /></center> |float=center |total width=800 |width1=1920 |height1=1080 |image1=Asteroid-2014RC-20140903b.jpg |caption1=Path around the Sun - 3 September 2014. |width2=1024 |height2=768 |image2=Asteroid-2014RC-20140903a.jpg |caption2=Path near the Earth - 7 September 2014. }}


Revision as of 05:31, 14 September 2014

2014 RC
Discovery[1][2]
Discovered byCatalina Sky Survey (703)
Pan-STARRS (F51)
Discovery date1-2 September 2014
Designations
Apollo asteroid, Near-Earth object
Orbital characteristics
Epoch 9 December 2014
Aphelion1.80412 AU
Perihelion0.820648 AU
1.31238 AU
Eccentricity0.37469
1.504 years
(549 days)[3]
25.6434°
Inclination4.5737°
345.00657°
71.1896°
Earth MOID0.000034 AU (5,100 km; 3,200 mi)
(0.013 LD)
Physical characteristics
Dimensions22 m (72 ft) (largest axis)[4]
11–25 m (36–82 ft)[5]
Mean density
>2.5 (assumed based on rotation/spectra)
15.8 seconds[4]
Sq-class[4]
26.8[3]

2014 RC is a small near-earth asteroid that made a close approach to Earth of 0.000267 AU (39,900 km; 24,800 mi) (0.1 lunar distances) around 18:02 UTC on 7 September 2014.[3][6][7] It is the fastest rotating asteroid so far discovered. The asteroid briefly brightened to about apparent magnitude 11.5,[8] so it was not visible to the naked eye or common binoculars. At the peak brightness the asteroid had a declination of –47,[8] and was most easily visible over New Zealand. The asteroid is approximately the diameter of the Chelyabinsk meteor,[4] and passed almost as close to Earth as 367943 Duende (2012 DA14) did in 2013. During 2014, asteroids 2014 AA and 2014 LY21 have come closer to Earth. 2014 RC was removed from the JPL Sentry Risk Table on 5 September 2014 and there are no known possible impact dates in the next 100 years.[9] On 8 September 2115 the asteroid will pass about 0.0043 AU (640,000 km; 400,000 mi) from the moon.[3] On 6–7 September 1973, the asteroid passed between 0.00076 AU (114,000 km; 71,000 mi)* and 0.015 AU (2,200,000 km; 1,400,000 mi)* from Earth.[3]

Asteroid 2014 RC[7]
Path around the Sun - 3 September 2014.
Path near the Earth - 7 September 2014.

Orbital shift

During the 2014 Earth close approach the orbital period of 2014 RC was reduced from 600 days to 549 days.[10] The orbital eccentricity decreased while the orbital inclination increased.

Parameter Epoch Aphelion
(Q) 		Perihelion
(q) 		Semi-major axis
(a) 		Eccentricity
(e) 		Period
(p) 		Inclination
(i) 		Longitude ascending node
(Ω) 		Mean anomaly
(M) 		Argument of perihelion
(ω)
Units AU (days) (°)
Pre-flyby 2014-Sep-01 1.95 0.834 1.39 0.400 600 1.44° 345° 326° 65.9°
Post-flyby 2014-Oct-01 1.80 0.821 1.31 0.375 549 4.57° 345° 340° 71.2°

Physical characteristics

With an absolute magnitude of 26.8,[3] the asteroid is about 11–25 meters (36–82 ft) in diameter depending on the albedo.[5] Observations by the NASA Infrared Telescope Facility conclude the asteroid is a fairly bright Sq-class asteroid which have an average albedo of around 0.24, and would give the asteroid a spherical equivalent diameter of 12 meters (39 ft).[4] Measurements by multiple telescopes indicate that the asteroid rotates in 15.8 seconds making it the fastest rotating asteroid so far discovered.[4] Using the 15.8 second rotation period, more accurate radar observations by Goldstone shows the asteroid has a largest axis of at least 22 meters (72 ft).[4] Due to the asteroids fast rotation, it is a monolith and not a rubble pile.

The Managua explosion on 6 September 2014 may or may not have been created by a bolide that was missed by millions of people, but either way it was not caused by the close approach of 2014 RC.[4]

References

  1. ^ "MPEC 2014-R23 : 2014 RC". IAU Minor Planet Center. 3 September 2014. Retrieved 5 September 2014. (K14R00C)
  2. ^ "MPEC 2014-R26 : 2014 RC". IAU Minor Planet Center. 3 September 2014. Retrieved 5 September 2014.
  3. ^ a b c d e f "JPL Small-Body Database Browser: (2014 RC)". 7 September 2014 last obs. {{cite web}}: Check date values in: |date= (help)
  4. ^ a b c d e f g h "Reports of Meteorite Strike in Nicaragua and Update on Asteroid 2014 RC". NASA/JPL Near-Earth Object Program Office. Retrieved 9 September 2014.
  5. ^ a b "JPL - Absolute Magnitude". NASA. Retrieved 4 September 2014.
  6. ^ "NASA reports asteroid to pass close, but safely past Earth". clarksvilleonline.com. Clarksville Online. Retrieved 4 September 2014.
  7. ^ a b Agle, DC; Brown, Dwayne (3 September 2014). "Small Asteroid to Safely Pass Close to Earth Sunday". NASA. Retrieved 7 September 2014.
  8. ^ a b "2014RC Ephemerides for 7 September 2014". NEODyS (Near Earth Objects – Dynamic Site). Retrieved 5 September 2014.
  9. ^ "Date/Time Removed". NASA/JPL Near-Earth Object Program Office. Retrieved 5 September 2014.
  10. ^ Horizons output. "Horizon Online Ephemeris System". Retrieved 7 September 2014. ("Ephemeris Type: Elements" PR value)
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