1994 WR12

1994 WR₁₂
Discovery
Discovered by	C. S. Shoemaker
Discovery site	Palomar Obs.
Discovery date	28 November 1994
Designations
MPC designation	1994 WR12
Minor planet category	NEO · Aten
Orbital characteristics
	Epoch 2022-Jan-21 (JD 2459600.5)
	Uncertainty parameter 0
Observation arc	27.01 yr (9,864 d)
Aphelion	1.0577 AU (158.23 million km)
Perihelion	0.4562 AU (68.25 million km)
Semi-major axis	0.7570 AU (113.25 million km)
Eccentricity	0.39735
Orbital period (sidereal)	240.6 days (0.659 yr)
Mean anomaly	217.06°
Mean motion	1° 29m 45.96s / day
Inclination	6.8515°
Longitude of ascending node	62.608°
Argument of perihelion	206.03°
Earth MOID	0.0018 AU (0.70 LD)
Physical characteristics
Mean diameter	130 m (est.); 92 – 210 m (CNEOS)
Mass	2.9×109 kg (est.)
Absolute magnitude (H)	22.3

1994 WR₁₂ is an asteroid and near-Earth object approximately 130 meters (430 feet) in diameter.^[3]^[4] As a member of the Aten group almost all of its orbit is closer to the Sun than Earth is. On 24 November 1994 it passed about 374100 km from the Moon.^[3] First imaged at Kitami Observatory on 26 November 1994,^[1] it was discovered two nights later by American astronomer Carolyn S. Shoemaker at Palomar Observatory on 28 November 1994.^[2] The asteroid then went unobserved from 1994 until it was recovered by Mauna Kea in March 2016.^[1] It was removed from the Sentry Risk Table on 2 April 2016.^[5]

Close approaches^[3]
Date	JPL SBDB nominal geocentric distance	uncertainty region (3-sigma)
2021-11-29	6152189 km	± 34 km^[6]
2046-11-25	1633719 km	± 4133 km
2190-11-23	135000000 km	± 815 million km^[7]

^ ^a ^b ^c ^d Cite error: The named reference MPC-object was invoked but never defined (see the help page).
^ ^a ^b Cite error: The named reference MPEC1994-Y05 was invoked but never defined (see the help page).
^ ^a ^b ^c ^d ^e ^f Cite error: The named reference jpldata was invoked but never defined (see the help page).
^ ^a ^b ^c Cite error: The named reference summary was invoked but never defined (see the help page).
^ Cite error: The named reference removed was invoked but never defined (see the help page).
^ Cite error: The named reference Horizons2021 was invoked but never defined (see the help page).
^ Cite error: The named reference Horizons2190 was invoked but never defined (see the help page).

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

[MPEC1994-Y05-2] Cite error: The named reference MPEC1994-Y05 was invoked but never defined (see the help page).

[jpldata-3] ^ ^a ^b ^c ^d ^e ^f Cite error: The named reference jpldata was invoked but never defined (see the help page).

[summary-4] Cite error: The named reference summary was invoked but never defined (see the help page).

[removed-5] Cite error: The named reference removed was invoked but never defined (see the help page).

[Horizons2021-6] Cite error: The named reference Horizons2021 was invoked but never defined (see the help page).

[Horizons2190-7] Cite error: The named reference Horizons2190 was invoked but never defined (see the help page).

[1]

[2]

[3]

[4]

[5]

[6]

[7]