Discovery [1] | |
---|---|
Discovered by | WISE |
Discovery site | Earth orbit |
Discovery date | 30 September 2014 |
Designations | |
(505657) 2014 SR339 | |
2014 SR339 | |
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 |
1.2997 AU | |
Eccentricity | 0.3040 |
1.48 yr (541 d) | |
60.524 ° | |
0° 39m 54.72s / day | |
Inclination | 29.790° |
138.78° | |
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] |
8–9
h
[5] 8.729 h [3] [a] | |
0.068±0.074 [4] | |
C(assumed on albeo) | |
18.6 [2] | |
(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]
2014 SR339 is a member of the Apollo asteroids, which cross the orbit of Earth. Apollo's are the largest group of near-Earth objects with nearly 10 thousand known objects. It orbits the Sun at a distance of 0.90–1.70 AU once every 18 months (541 days; semi-major axis of 1.30 AU). Its orbit has an eccentricity of 0.30 and an inclination of 30 ° with respect to the ecliptic. [2] With an aphelion of 1.70 AU, it is also a Mars-crosser, as it crosses the orbit of the Red Planet at 1.666 AU. The body's observation arc begins with its official discovery observation by WISE in September 2014. [1]
As a potentially hazardous asteroid, 2014 SR339 has a minimum orbital intersection distance (MOID) with Earth of less than 0.05 AU and a diameter of greater than 150 meters. The Earth-MOID is currently 0.0354 AU (5,300,000 km), which translates into 13.8 lunar distances (LD). [2]
On 7 February 2018 it passed 0.054 AU (21 LD) from the Earth when its apparent magnitude brightened to 14. [3] Goldstone observed it until the following day. [6] While this was an 8.1-million kilometer flyby, the next close flyby of 6.3 million km will occur on 5 February 2058, and another 7.6 million km on 8 February 2095. It will also have a 3.2 million km flyby of Mars on 26 September 2048. [7]
The asteroid's spectral type is unknown. Due to its unusually low albedo (see below) it is likely a carbonaceous C-type asteroid. [2]
On 9 February, radiometric observations by the Arecibo Observatory revealed that the asteroid has an elongated, lumpy shape. [3] The radar images also gave it a rotational period between 8 and 9 hours. [5] A refined period of 8.7 hour agrees with (photometric) lightcurve observations by American photometrist Brian Warner at the Center for Solar System Studies ( U82) during 9–11 February 2018, who obtained a period of 8.729 hours with a high brightness amplitude of 0.93 magnitude, which also indicates a non-spheroidal shape ( U=3-). [3] [a]
According to the survey carried out by the NEOWISE mission of NASA's WISE telescope, 2014 SR339 measures 0.971 kilometers in diameter and its surface has an albedo of 0.068. [4] During its close approach in February 2018, radiometric observations by Arecibo Observatory determined that the object is at least 1.5 kilometers (0.93 miles) wide. [3] Data from the Arecibo Telescope released in 2022 showed an unusually high radar albedo, possibly indicating rich metal content. [8]
This minor planet was numbered by the Minor Planet Center on 4 November 2017 ( M.P.C. 107069). [9] As of 2018, it has not been named. [1]
Recent radar images of near-Earth asteroid (505657) 2014 SR339 from @NAICobservatory show a lumpy, elongated body at least 1.5 km long and rotating once every 8 to 9 hours!
Discovery [1] | |
---|---|
Discovered by | WISE |
Discovery site | Earth orbit |
Discovery date | 30 September 2014 |
Designations | |
(505657) 2014 SR339 | |
2014 SR339 | |
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 |
1.2997 AU | |
Eccentricity | 0.3040 |
1.48 yr (541 d) | |
60.524 ° | |
0° 39m 54.72s / day | |
Inclination | 29.790° |
138.78° | |
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] |
8–9
h
[5] 8.729 h [3] [a] | |
0.068±0.074 [4] | |
C(assumed on albeo) | |
18.6 [2] | |
(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]
2014 SR339 is a member of the Apollo asteroids, which cross the orbit of Earth. Apollo's are the largest group of near-Earth objects with nearly 10 thousand known objects. It orbits the Sun at a distance of 0.90–1.70 AU once every 18 months (541 days; semi-major axis of 1.30 AU). Its orbit has an eccentricity of 0.30 and an inclination of 30 ° with respect to the ecliptic. [2] With an aphelion of 1.70 AU, it is also a Mars-crosser, as it crosses the orbit of the Red Planet at 1.666 AU. The body's observation arc begins with its official discovery observation by WISE in September 2014. [1]
As a potentially hazardous asteroid, 2014 SR339 has a minimum orbital intersection distance (MOID) with Earth of less than 0.05 AU and a diameter of greater than 150 meters. The Earth-MOID is currently 0.0354 AU (5,300,000 km), which translates into 13.8 lunar distances (LD). [2]
On 7 February 2018 it passed 0.054 AU (21 LD) from the Earth when its apparent magnitude brightened to 14. [3] Goldstone observed it until the following day. [6] While this was an 8.1-million kilometer flyby, the next close flyby of 6.3 million km will occur on 5 February 2058, and another 7.6 million km on 8 February 2095. It will also have a 3.2 million km flyby of Mars on 26 September 2048. [7]
The asteroid's spectral type is unknown. Due to its unusually low albedo (see below) it is likely a carbonaceous C-type asteroid. [2]
On 9 February, radiometric observations by the Arecibo Observatory revealed that the asteroid has an elongated, lumpy shape. [3] The radar images also gave it a rotational period between 8 and 9 hours. [5] A refined period of 8.7 hour agrees with (photometric) lightcurve observations by American photometrist Brian Warner at the Center for Solar System Studies ( U82) during 9–11 February 2018, who obtained a period of 8.729 hours with a high brightness amplitude of 0.93 magnitude, which also indicates a non-spheroidal shape ( U=3-). [3] [a]
According to the survey carried out by the NEOWISE mission of NASA's WISE telescope, 2014 SR339 measures 0.971 kilometers in diameter and its surface has an albedo of 0.068. [4] During its close approach in February 2018, radiometric observations by Arecibo Observatory determined that the object is at least 1.5 kilometers (0.93 miles) wide. [3] Data from the Arecibo Telescope released in 2022 showed an unusually high radar albedo, possibly indicating rich metal content. [8]
This minor planet was numbered by the Minor Planet Center on 4 November 2017 ( M.P.C. 107069). [9] As of 2018, it has not been named. [1]
Recent radar images of near-Earth asteroid (505657) 2014 SR339 from @NAICobservatory show a lumpy, elongated body at least 1.5 km long and rotating once every 8 to 9 hours!