2019 OK

2019 OK
	2019 OK orbits near the ecliptic plane out to the asteroid belt and inside the orbit of Venus
Discovery
Discovered by	SONEAR Obs.
Discovery site	SONEAR Obs. (Y00)
Discovery date	24 July 2019
Designations
MPC designation	2019 OK
Alternative designations	NEOCP S511618
Minor planet category	Apollo · NEO
Orbital characteristics
	Epoch 27 April 2019 (JD 2458600.5)
	Uncertainty parameter 1
Observation arc	2.42 years
Earliest precovery date	2017-02-21 (Pan-STARRS)
Aphelion	3.4315 AU
Perihelion	0.4635 AU
Semi-major axis	1.9475 AU
Eccentricity	0.7620
Orbital period (sidereal)	2.72 yr (993 d)
Mean anomaly	310.58°
Mean motion	0° 21m 45.36s / day
Inclination	1.4006°
Longitude of ascending node	302.27°
Argument of perihelion	104.24°
Earth MOID	0.00036 AU (54,000 km) (0.14 LD)
Physical characteristics
Mean diameter	57–130 m (187–426 ft)
Absolute magnitude (H)	23.3±0.3; 23.3

2019 OK^[a] is a near-Earth asteroid noted for its sudden, surprise discovery on the day before its close flyby in 2019.^[4] The object's size is estimated at 57 to 130 metres (187 to 426 ft) across, the closest asteroid of such size discovered in 2019.^[5] It is uncommon for asteroids of this moderately large size to pass within 100,000 km (62,000 mi) of Earth.

^ ^a ^b Cite error: The named reference MPC-object was invoked but never defined (see the help page).
^ Cite error: The named reference Gray was invoked but never defined (see the help page).
^ ^a ^b Cite error: The named reference jpldata was invoked but never defined (see the help page).
^ Vergano, Dan; Leopold, Jason (19 September 2019). "A "Sneaky" Asteroid Narrowly Missed Earth This Summer. Internal Emails Show How NASA Scientists Totally Missed It. - "This one did sneak up on us," one NASA expert wrote in an internal email, two days after the football-field-sized asteroid narrowly missed the planet". BuzzFeed News. Retrieved 20 September 2019.
^ Mannix, Liam. "Earth had a near-miss with a 'city-killer' asteroid". stuff.co.nz. Retrieved 26 July 2019.

Cite error: There are <ref group=lower-alpha> tags or {{efn}} templates on this page, but the references will not show without a {{reflist|group=lower-alpha}} template or {{notelist}} template (see the help page).

[MPC-object-1] Cite error: The named reference MPC-object was invoked but never defined (see the help page).

[Gray-2] Cite error: The named reference Gray was invoked but never defined (see the help page).

[jpldata-3] Cite error: The named reference jpldata was invoked but never defined (see the help page).

[BF-20190919-5] Vergano, Dan; Leopold, Jason (19 September 2019). "A "Sneaky" Asteroid Narrowly Missed Earth This Summer. Internal Emails Show How NASA Scientists Totally Missed It. - "This one did sneak up on us," one NASA expert wrote in an internal email, two days after the football-field-sized asteroid narrowly missed the planet". BuzzFeed News. Retrieved 20 September 2019.

[stuff-6] Mannix, Liam. "Earth had a near-miss with a 'city-killer' asteroid". stuff.co.nz. Retrieved 26 July 2019.

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Discovery ^[1]
2019 OK orbits near the ecliptic plane out to the asteroid belt and inside the orbit of Venus
Discovered by	SONEAR Obs.
Discovery site	SONEAR Obs. (Y00)
Discovery date	24 July 2019
Designations
MPC designation	2019 OK
Alternative designations	NEOCP S511618^[2]
Minor planet category	Apollo · NEO
Orbital characteristics ^[3]
Epoch 27 April 2019 (JD 2458600.5)
Uncertainty parameter 1
Observation arc	2.42 years
Earliest precovery date	2017-02-21 (Pan-STARRS)
Aphelion	3.4315 AU
Perihelion	0.4635 AU
Semi-major axis	1.9475 AU
Eccentricity	0.7620
Orbital period (sidereal)	2.72 yr (993 d)
Mean anomaly	310.58°
Mean motion	0° 21^m 45.36^s / day
Inclination	1.4006°
Longitude of ascending node	302.27°
Argument of perihelion	104.24°
Earth MOID	0.00036 AU (54,000 km) (0.14 LD)
Physical characteristics
Mean diameter	57–130 m (187–426 ft)
Absolute magnitude (H)	23.3±0.3^[3] 23.3^[1]