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2019 OU1[lower-alpha 1] is a sub-kilometre asteroid, classified as a near-Earth object of the Apollo group.[1][2] On 28 August 2019, the object safely passed 1.028 million kilometres from Earth,[3] travelling at around 13 km/s (47,000 km/h).[2]

2019 OU1
Discovery[1]
Discovered byPan-STARRS 1
Discovery siteHaleakala Obs.
Discovery date25 July 2019 (first observed)
Designations
MPC designation
2019 OU1
Minor planet category
Apollo · NEO [1][2]
Orbital characteristics[1][2]
Epoch 27 April 2019 (JD 2458600.5)
Uncertainty parameter 6[2] · 7[1]
Aphelion3.673 au
Perihelion0.5748 au
Semi-major axis
2.2679 au
Eccentricity0.61977
Orbital period (sidereal)
3.42 years
Mean anomaly
313.73°
Mean motion
0° 17m 18.916s / day
Inclination2.2176°
Longitude of ascending node
145.143°
Argument of perihelion
241.08°
Earth MOID0.0062 au (2.4 LD)
Jupiter MOID1.79 au
Physical characteristics
Mean diameter
71 m[3] (est. at 0.25)[4]
160 m[5] (est. at 0.05)[4]
Absolute magnitude (H)
22.87[2]

    Observation


    2019 OU1 was first observed on 25 July 2019 by Pan-STARRS 1 at Haleakala Observatory, Hawaii, United States.[1]


    Orbit and classification


    2019 OU1 is classified as an Apollo asteroid, which means that it is an Earth-crossing asteroid that has an orbital semi-major axis greater than 1 au but a perihelion distance less than Earth's aphelion distance of 1.017 au.[6]


    Close approach in 2019


    On 28 August 2019, 2019 OU1 safely passed 0.00687 astronomical units (1.028 million kilometres; 2.67 lunar distances) from Earth,[3] travelling at around 13 km/s (47,000 km/h).[2]


    Physical characteristics


    Based on its absolute magnitude of 22.874,[1] 2019 OU1 is estimated to have a diameter of 71–160 metres[5] using an assumed albedo of 0.05 (carbonaceous) and 0.25 (siliceous) respectively.[4]


    See also



    Notes


    1. The name 2019 OU1 is its provisional designation which is based on the date it was discovered: 2019 for the year, "O" for half-month of 16–31 July, and "U1" for the 21st discovery in the 1st reiteration of the alphabet (excluding "I"), making it the 45th object discovered in the second half of July 2019.

    References


    1. "IAU Minor Planet Center – 2019 OU1". MinorPlanetCenter.net. Retrieved 13 August 2019.
    2. "JPL Small-Body Database Browser". ssd.jpl.nasa.gov. Retrieved 13 August 2019.
    3. Mathur, Natasha (12 August 2019). "Asteroid Alert! Giant Asteroid 2019 OU1 To Zoom Past Earth This Month". Mashable India. Retrieved 13 August 2019.
    4. "Asteroid Size Estimator". cneos.jpl.nasa.gov. Retrieved 13 August 2019.
    5. Ciaccia, Chris (12 August 2019). "Asteroid the size of the Washington Monument will fly past Earth this month". Fox News. Retrieved 13 August 2019.
    6. "NEO Basics – Potentially Hazardous Asteroids (PHAs)". CNEOS NASA/JPL. Retrieved 7 August 2019.




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