astro.wikisort.org - Asteroid

2014 RC is a sub-kilometer near-Earth object and Apollo asteroid. The exceptionally fast rotator passed within 0.000267 AU (39,900 km; 24,800 mi) (0.1 lunar distances) of Earth on 7 September 2014. The asteroid is approximately the diameter of the Chelyabinsk meteor,[5] and passed almost as close to Earth as 367943 Duende (2012 DA₁₄) did in 2013.

2014 RC

2014 RC imaged by the Goldstone Radar on 7 September 2014
Discovery[1][2][3]
Discovered by	CSS
Discovery site	Catalina Stn.
Discovery date	1 September 2014 (first observed only)
Designations
MPC designation	2014 RC
Minor planet category	NEO · Apollo[3][4]
Orbital characteristics[4]
Epoch 1 July 2021 (JD 2459396.5)
Uncertainty parameter 3[3][4]
Observation arc	18 days w/Radar
Aphelion	1.8064 AU
Perihelion	0.8211 AU
Semi-major axis	1.3138 AU
Eccentricity	0.3750
Orbital period (sidereal)	1.51 yr (550 d)
Mean anomaly	155.44°
Mean motion	0° 39m 16.2s / day
Inclination	4.5687°
Longitude of ascending node	344.91°
Argument of perihelion	71.090°
Earth MOID	0.0003 AU (0.1169 LD)
Physical characteristics
Dimensions	>22 m (largest axis)[5]
Mean diameter	~12–25 m (est.)[6]
Synodic rotation period	0.004389 h (15.80 s)[7][8]
Spectral type	S/q[5][8]
Apparent magnitude	28 (Nov/Dec 2014)
Absolute magnitude (H)	26.8[3][4]

With an absolute magnitude of 26.8,[4] the asteroid is about 11–25 meters (36–82 ft) in diameter depending on the albedo.[6] 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).[5] Measurements by multiple telescopes indicate that the asteroid rotates in 15.8 seconds making it one of the fastest rotating asteroids so far discovered.[5][8] 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).[5] Due to the asteroid's fast rotation, it is a monolith and not a rubble pile.

On 8 September 2115 the asteroid will pass about 0.0053 AU (790,000 km; 490,000 mi) from the moon.[4] On 5 September 1973, the asteroid passed between 0.01052 AU (1,574,000 km; 978,000 mi) and 0.01207 AU (1,806,000 km; 1,122,000 mi) from Earth.[4] 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]

2014 approach

It made a close approach to Earth of 0.000267 AU (39,900 km; 24,800 mi) (0.1 LD) around 18:02 UTC on 7 September 2014.[4][10][11] The asteroid briefly brightened to about apparent magnitude 11.5,[12] but it was still not visible to the naked eye or common binoculars. At the peak brightness the asteroid had a declination of –47,[12] and was most easily visible over New Zealand. During 2014, asteroids 2014 AA and 2014 LY21 have come closer to Earth.

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.[5]

Orbital shift

During the 2014 Earth close approach the orbital period of 2014 RC was reduced from 600 days to 549 days.[13] 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	2014-09-01	1.9488	0.8344	1.3916	0.4004	599.62	1.4395°	345.48°	326.12°	65.879°
flyby	2014-09-07 18:02 UTC	2.0284	0.8150	1.4217	0.4267	619.17	1.4217°	345.09°	330.91°	68.602°
Post-flyby	2014-10-01	1.8042	0.8207	1.3124	0.3747	549.18	4.5744°	345.01°	340.41°	71.187°

Close-approach table

Object	Date (UTC)	Date error (hours)	Nominal distance (AU)	Nominal distance (LD)	Minimum distance (AU)	Minimum distance (LD)	Apparent magnitude (V)
Earth	1945-09-06 05:53	47.16	0.00442	1.72	0.00101	0.39	17.3
Moon	1945-09-06 14:33	52.48	0.00508	1.98	0.00103	0.40	–
Mars	1957-10-09 13:55	5.40	0.06371	24.78	0.05267	20.49	–
Earth	1973-09-05 21:42	0.62	0.01169	4.55	0.01089	4.24	19.3
Earth	1987-01-17 01:02	0.30	0.03724	14.49	0.03686	14.34	22.4
Earth	1991-09-27 05:38	1.03	0.09911	38.55	0.09878	38.43	27.0
Mars	1999-09-22 14:00	<0.01	0.03739	14.54	0.03712	14.44	–
Earth	2009-12-30 13:10	0.28	0.08634	33.59	0.08622	33.54	26.0
Moon	2014-09-07 08:47	<0.01	0.000845	0.329	0.000845	0.329	–
Earth	2014-09-07 18:02	<0.01	0.000267	0.104	0.000267	0.104	15.9
Earth	2017-09-11 13:50	0.15	0.03864	15.03	0.03850	14.98	23.3
Earth	2020-09-22 21:24	0.35	0.09908	38.54	0.09893	38.48	26.1
Earth	2039-01-21 23:38	0.13	0.06224	24.21	0.06215	24.18	24.0
Earth	2042-01-27 18:19	0.10	0.06322	24.59	0.06313	24.56	23.6
Earth	2109-09-01 16:27	0.07	0.09959	38.74	0.09945	38.69	24.7
Earth	2112-09-06 21:13	0.08	0.02253	8.76	0.02241	8.72	21.1
Moon	2115-09-08 19:11	0.15	0.00558	2.17	0.005350	2.08	–
Earth	2115-09-08 22:50	0.17	0.00785	3.05	0.00763	2.97	18.5
Mars	2140-10-13 22:42	2.85	0.07152	27.82	0.05471	21.28	–
Earth	2159-02-02 22:17	16.90	0.08084	31.45	0.05563	21.64	24.2
Earth	2162-01-19 14:04	38.85	0.09376	36.47	0.07273	28.29	25.2
Earth	2170-09-19 02:08	9.12	0.07413	28.84	0.06707	26.09	25.1
Earth	2173-09-04 16:52	1.38	0.06123	23.82	0.05950	23.15	23.5

See also

• List of fast rotators (minor planets)

References

External links

• ASTEROID 2014 RC Tracking
• Close Approach of Asteroid 2014 RC (Remanzacco Observatory)
• Small Asteroid Will Pass Earth Closely but Safely on Sunday (Phil Plait)
• 2014 RC at NeoDyS-2, Near Earth Objects—Dynamic Site
  • Ephemerides · Observation prediction · Orbital info · MOID · Proper elements · Observational info · Close approaches · Physical info · Orbit animation
• 2014 RC at ESA–space situational awareness
  • Ephemerides · Observations · Orbit · Physical properties · Summary
• 2014 RC at the JPL Small-Body Database
  • Close approach · Discovery · Ephemeris · Orbit diagram · Orbital elements · Physical parameters

На других языках

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- [en] 2014 RC

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[es] 2014 RC

2014 RC es un pequeño asteroide cercano a la Tierra que hizo una aproximación cercana a la Tierra de 0,000267 UA (39,900 km, 24.800 km) (0,1 distancias lunares) en torno a las 18:02 UTC, el 7 de septiembre de 2014.[2][4][5]

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[ru] 2014 RC

2014 RC — небольшой околоземный астероид, открытый 31 августа 2014 года в рамках Каталинского небесного обзора. В следующую ночь наблюдался системой телескопов Pan-STARRS.

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