2014 XL7

2014 XL7
Discovery[1]
Discovered by Mt. Lemmon Survey (G96)
Discovery date 11 December 2014
Designations
MPC designation 2014 XL7
Apollo, NEO,
PHA[2]
Orbital characteristics[2]
Epoch 13 January 2016 (JD 2457400.5)
Uncertainty parameter 3
Observation arc 475 days (1.30 yr)
Aphelion 2.5362 AU (379.41 Gm) (Q)
Perihelion 0.77211 AU (115.506 Gm) (q)
1.6542 AU (247.46 Gm) (a)
Eccentricity 0.53323 (e)
2.13 yr (777.08 d)
235.20° (M)
0° 27m 47.772s / day (n)
Inclination 7.5012° (i)
74.514° (Ω)
250.71° (ω)
Earth MOID 0.00258894 AU (387,300 km)
Jupiter MOID 2.83909 AU (424.722 Gm)
Physical characteristics
Dimensions ~230 meters[3]
170 – 380 meters[4]
21.0[2]

    2014 XL7 (also written 2014 XL7) was the most dangerous potentially hazardous asteroid discovered in 2014 that remained on the Sentry Risk Table at the end of 2014.[5] The Apollo near-Earth asteroid is estimated to be roughly 230 meters in diameter and had a cumulative 1 in 83000 chance of impacting Earth on 4–5 June between the years 2048 and 2084.[3] It was removed from the Sentry Risk Table on 15 January 2015 using JPL solution 9 with an observation arc of 35 days.[6]

    On 1 September 2014 the asteroid passed about 0.259 AU (38,700,000 km; 24,100,000 mi) from Earth,[7] but at that time the asteroid had an apparent magnitude of 25 and was roughly 25 degrees from the Sun.[8] It was discovered on 11 December 2014 by the Mount Lemmon Survey at an apparent magnitude of 20 using a 1.5-meter (59 in) reflecting telescope.[1] The asteroid has an observation arc of 35 days with an uncertainty parameter of 6.[2] The asteroid was last observed on 15 January 2015,[2] and is still being actively observed to better constrain the orbit. The asteroid will not drop below magnitude 25 until March 2015.[9]

    With an absolute magnitude of 21,[2] the asteroid is about 170–380 meters in diameter.[4]

    With an observation arc of 19 days, it had a cumulative Palermo Scale rating of –2.85 and was briefly the 9th most dangerous asteroid known.[5] It was calculated that on 4 June 2065 there was a 1 in 270000 chance of impact and on 4 June 2076 there was a 1 in 137000 chance of impact.[3] On 15 January 2015 the asteroid was recovered by Cerro Paranal Observatory which extended the observation arc to 35 days,[10] and 2014 XL7 was removed from the Sentry Risk Table.[6]

    References

    1. 1 2 "MPEC 2014-X76 : 2014 XL7". IAU Minor Planet Center. 2014-12-15. Retrieved 2015-01-01. (K14X07L)
    2. 1 2 3 4 5 6 "JPL Small-Body Database Browser: (2014 XL7)" (last observation: 2014-12-30; arc: 19 days). Jet Propulsion Laboratory. Retrieved 4 April 2016.
    3. 1 2 3 "Earth Impact Risk Summary: 2014 XL7". WayBack Machine: NASA/JPL Near-Earth Object Program Office. 2014-12-31. Archived from the original on December 31, 2014. Retrieved 2015-01-01.
    4. 1 2 "Absolute Magnitude (H)". NASA/JPL. Retrieved 2015-01-01.
    5. 1 2 "Sentry Risk Table". WayBack Machine: NASA/JPL Near-Earth Object Program Office. 2014-12-31. Archived from the original on December 31, 2014. Retrieved 2015-01-01. (PS=–2.85)
    6. 1 2 "Date/Time Removed". NASA/JPL Near-Earth Object Program Office. Retrieved 2015-01-16.
    7. ↑ "JPL Close-Approach Data: (2014 XL7)" (last observation: 2014-12-30; arc: 19 days). Retrieved 2015-01-01.
    8. ↑ "2014XL7 Ephemerides for 1 September 2014". NEODyS (Near Earth Objects – Dynamic Site). Retrieved 2015-01-01.
    9. ↑ "2014XL7 Ephemerides for 1 January 2015 through 1 April 2015". NEODyS (Near Earth Objects – Dynamic Site). Retrieved 2014-12-12.
    10. ↑ "2014 XL7 Orbit". IAU Minor Planet Center. Retrieved 2015-01-16.

    External links


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