2016 NL56

2016 NL56 (also written 2016 NL56) is a Near-Earth Object (NEO) and a Potentially Hazardous Asteroid (PHA), meaning that it has an orbit that can make close approaches to the Earth and large enough to cause significant regional damage in the event of impact. It is an Apollo asteroid, meaning that it is an Earth-crossing asteroid that has an orbit larger than the orbit of the Earth. It was first observed on July 12, 2016, when the asteroid was more than 1 AU from Earth[1] and had a solar elongation of 163 degrees.[5]

2016 NL56
Discovery [1] [2]
Discovery sitePan-STARRS at the Haleakala Observatory, Hawaii
Discovery dateJuly 12, 2016
Designations
2016 NL56
[1][2][3]
Orbital characteristics[3] ( [1] )
Epoch 2016-Jul-13.0 (JD 2457582.5)
( 2016-Jul-11.0 (JD 2457580.5) )
Uncertainty parameter 9
Observation arc2.8 days[4]
Aphelion2.21±0.12 AU (Q) (1.97 AU)
Perihelion0.55±0.22 AU (q) (0.61 AU)
1.38±0.08 AU (a) (1.29 AU)
Eccentricity0.60±0.17 (e) (0.53)
1.62±0.13 years (1.47 years)
265°±21° (M) (157°)
Inclination4.5°±0.5° (i) (5.1°)
3°±23° (Ω) (56°)
83°±5° (ω) (68°)
Earth MOID0.0065 AU (970,000 km) (0.020 AU)
Venus MOID0.0112 AU (1,680,000 km)[1]
Jupiter MOID3.06 AU (458,000,000 km) (3.12 AU)
Physical characteristics
Mean diameter
300 m[4]
600 m[2]
19.0[1][2]
19.6[3]
20.6[4]

    This asteroid is a lost asteroid.[6] It has a short observation arc of 2.8 days and has not been seen since 2016, so it has an orbit that is only roughly calculated. The orbital characteristics cataloged in the JPL Small-Body Database (SBDB) and the IAU Minor Planet Center (MPC) are different, with many of the values for the MPC being outside the stated uncertainty of the SBDB values.

    This asteroid is in both the Risk List[2] of the European Space Agency (ESA) - Space Situational Awareness (SSA) and in the Sentry List[7] of the Jet Propulsion Laboratory (JPL) - Center for Near Earth Object Studies (CNEOS). According to the Sentry List, of the possible close encounters with Earth in the foreseeable future, an encounter on September 5, 2024 has the highest Palermo Technical Impact Hazard Scale value.[4]

    Close encounters

    According to the Near Earth Objects Dynamic Site (NEODyS), of the possible close encounters with Earth in the foreseeable future, an encounter on April 14, 2025 is the most likely.[8] This close encounter with Earth is shortly after a close encounter with Venus on March 22, 2025. For this event that has a close encounter first with Venus and then with Earth, both encounters have a minimum possible distance of zero, meaning that an impact onto Venus or Earth is possible.

    See also

    References
    1. "IAU Minor Planet Center 2016 NL56". International Astronomical Union. Retrieved 4 August 2020.
    2. "ESA space situational awareness 2016NL56". European Space Agency. Retrieved 4 August 2020.
    3. "JPL Small-Body Database Browser (2016 NL56)". Jet Propulsion Laboratory. Retrieved 4 August 2020.
    4. "Sentry: Earth Impact Monitoring - Object Details 2016 NL56". Jet Propulsion Laboratory. Retrieved 4 August 2020.
    5. "JPL HORIZONS Web-Interface (2016 NL56)". Jet Propulsion Laboratory. Retrieved 4 August 2020.
    6. "NEODyS-2 Risk List". SpaceDys. Retrieved 4 August 2020.
    7. "Sentry: Earth Impact Monitoring - Impact Risk Data". Jet Propulsion Laboratory. Retrieved 4 August 2020.
    8. "NEODyS-2 - Near Earth Objects - Dynamic Site - 2016NL56 - Close Approaches". SpaceDys. Retrieved 4 August 2020.


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