(505657) 2014 SR339

(505657) 2014 SR₃₃₉
	Radar images of 2014 SR339 taken by the Arecibo Observatory on 9 February 2018
Discovery
Discovered by	WISE
Discovery site	Earth orbit
Discovery date	30 September 2014
Designations
MPC designation	(505657) 2014 SR339
Alternative designations	2014 SR339
Minor planet category	Apollo · NEO · PHA
Orbital characteristics
	Epoch 23 March 2018 (JD 2458200.5)
	Uncertainty parameter 0
Observation arc	3.41 yr (1,245 d)
Aphelion	1.6948 AU
Perihelion	0.9046 AU
Semi-major axis	1.2997 AU
Eccentricity	0.3040
Orbital period (sidereal)	1.48 yr (541 d)
Mean anomaly	60.524°
Mean motion	0° 39m 54.72s / day
Inclination	29.790°
Longitude of ascending node	138.78°
Argument of perihelion	299.60°
Earth MOID	0.0354 AU (13.8 LD)
Physical characteristics
Dimensions	(>1.5 km × ? km)
Mean diameter	0.971±0.367 km
Synodic rotation period	8–9 h; 8.729 h
Geometric albedo	0.068±0.074
Spectral type	C(assumed on albeo)
Absolute magnitude (H)	18.6

(505657) 2014 SR₃₃₉, provisional designation 2014 SR₃₃₉, is a dark and elongated asteroid, classified as near-Earth object and potentially hazardous asteroid of the Apollo group, approximately 970 meters (3,200 feet) in diameter. It was discovered on 30 September 2014, by NASA's Wide-field Infrared Survey Explorer telescope (WISE) in Earth's orbit.^[1] Closely observed at Goldstone and Arecibo in February 2018, it has a rotation period of 8.7 hours.^[5]

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Discovery^[1]
Radar images of 2014 SR₃₃₉ taken by the Arecibo Observatory on 9 February 2018
Discovered by	WISE
Discovery site	Earth orbit
Discovery date	30 September 2014
Designations
MPC designation	(505657) 2014 SR₃₃₉
Alternative designations	2014 SR₃₃₉
Minor planet category	Apollo · NEO · PHA^[1]^[2]
Orbital characteristics^[2]
Epoch 23 March 2018 (JD 2458200.5)
Uncertainty parameter 0
Observation arc	3.41 yr (1,245 d)
Aphelion	1.6948 AU
Perihelion	0.9046 AU
Semi-major axis	1.2997 AU
Eccentricity	0.3040
Orbital period (sidereal)	1.48 yr (541 d)
Mean anomaly	60.524°
Mean motion	0° 39^m 54.72^s / day
Inclination	29.790°
Longitude of ascending node	138.78°
Argument of perihelion	299.60°
Earth MOID	0.0354 AU (13.8 LD)
Physical characteristics
Dimensions	(>1.5 km × ? km)^[3]
Mean diameter	0.971±0.367 km^[4]
Synodic rotation period	8–9 h^[5] 8.729 h^[3]^[a]
Geometric albedo	0.068±0.074^[4]
Spectral type	C(assumed on albeo)
Absolute magnitude (H)	18.6^[2]