Asteroids

1994WR12 help

Last update: 2026-06-04 23:11 UTC

Orbital Properties

Epoch

61200.0

MJD

Orbit type

Aten

Perihelion (q)

0.456

Aphelion (Q)

1.057

Eccentricity (e)

0.398

Inclination (i)

6.8

deg

Orbit period (P)

240.4

Earth MOID

0.00111

U parameter

1.0

A₂

-218.9

10^-15au/days²

Next Earth close approach

Date

2028-01-17

Nominal distance (from Earth center)

0.1829

27362005

Maximum Brightness

22.2

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

22.4

mag

Diameter

90 - 200*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

1994-11-28

Observatory

Palomar Mountain

ORBIT VISUALISATION TOOLS

External links

Proper elements

Epoch

Near present day

Near middle of observation arc

Orbit properties

Epoch
Semimajor Axis
Eccentricity (e)
Inclination (i)
Long. of Ascending Node (Ω)
Arg. of Perihelion (ω)
Mean Anomaly (M)
Perihelion distance
Aphelion distance
Asc. Node-Earth Sep.
Desc. Node-Earth Sep.
MOID
Orbit Period
U parameter

Value

1-sigma variation

Unit

Epoch

Value

61200.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

0.756652

1-sigma variation

7.994E-9

Unit

Eccentricity (e)

Value

0.397567

1-sigma variation

1.308E-7

Unit

Inclination (i)

Value

6.8411

1-sigma variation

8.444E-6

Unit

Long. of Ascending Node (Ω)

Value

62.4443

1-sigma variation

1.070E-5

Unit

Arg. of Perihelion (ω)

Value

206.1218

1-sigma variation

1.447E-5

Unit

Mean Anomaly (M)

Value

92.23742

1-sigma variation

0.00002

Unit

Perihelion distance

Value

0.455832

1-sigma variation

Unit

Aphelion distance

Value

1.057472

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.002891

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.542936

1-sigma variation

Unit

MOID

Value

0.001109

1-sigma variation

Unit

Orbit Period

Value

240.4046

1-sigma variation

Unit

U parameter

Value

1.0

1-sigma variation

Unit

A₂

Value

-218.89947

1-sigma variation

9.83567

Unit

10^-15au/days²

Covariance Matrix

	a	e	i	Ω	ω	M	A₂
a	6.39076E-17	-9.62162E-16	-4.68560E-14	-1.80984E-14	-7.08854E-14	-3.24494E-14	7.85353E-8
e	-9.62162E-16	1.71164E-14	7.79693E-13	2.38797E-13	1.32335E-12	-3.66126E-14	-1.18602E-6
i	-4.68560E-14	7.79693E-13	7.12943E-11	5.66704E-11	1.82514E-11	3.90556E-12	-5.59118E-5
Ω	-1.80984E-14	2.38797E-13	5.66704E-11	1.14489E-10	-6.57219E-11	-4.36334E-11	-1.87614E-5
ω	-7.08854E-14	1.32335E-12	1.82514E-11	-6.57219E-11	2.09401E-10	-7.00619E-11	-8.87085E-5
M	-3.24494E-14	-3.66126E-14	3.90556E-12	-4.36334E-11	-7.00619E-11	3.89953E-10	-4.43379E-5
A₂	7.85353E-8	-1.18602E-6	-5.59118E-5	-1.87614E-5	-8.87085E-5	-4.43379E-5	9.67403E1

Date of computation: 2026-06-04 23:11 UTC

Note: The ASCII file is in a format suitable for Orbfit input.

Download ASCII file:

Physical properties

Rotation Period
Quality
Amplitude
Rotation Direction
Spinvector L
Spinvector B

Rotational properties

Value

Unit

Source

Rotation Period

Value

Unit

Source

[-]

Quality

Value

Unit

Source

[-]

Amplitude

Value

Unit

mag

Source

[-]

Rotation Direction

Value

Unit

Source

[-]

Spinvector L

Value

Unit

Source

[-]

Spinvector B

Value

Unit

Source

[-]

Taxonomy
Taxonomy (all)

Taxonomy

Value

Unit

Source

Taxonomy

Value

Unit

Source

[-]

Taxonomy (all)

Value

Unit

Source

[-]

Absolute Magnitude (H)
Slope Parameter (G)

H / G

Value

Unit

Source

Absolute Magnitude (H)

Value

22.381

Unit

mag

Source

[1]

Slope Parameter (G)

Value

0.15**

Unit

Source

[1]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

0.05 - 0.25

Unit

Source

[2]

Diameter

Value

90 - 200*

Unit

Source

[2]

Color Index Information

Color Index Information

Value

Unit

Source

Color Index Information

Value

Unit

mag

Source

[-]

Sightings

Sightings

Value

Unit

Source

Sightings

Value

Unit

Source

[-]

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Sources

No.	Name	Additional
[1]	ESA Aegis	ESA orbit determination and impact monitoring system
[2]	Estimation	Estimated from absolute magnitude

Observational Information

Arc Length
Unobserved
Normalized RMS of residuals

Arc Information

Value

Unit

Source

Arc Length

Value

11345

Unit

Source

[1]

Unobserved

Value

197

Unit

Source

[1]

Normalized RMS of residuals

Value

0.653097

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

1994-11-26.48611

Unit

Source

[2]

Last Observation

Value

2025-12-18.502394

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

154 (2)

Unit

Source

[1]

Radar Summary

First Observation
Last Observation
Delay (Discarded)
Doppler (Discarded)
Total Optical Observations (Discarded)

Radar

Value

Unit

Source

First Observation

Value

Unit

Source

[-]

Last Observation

Value

Unit

Source

[-]

Delay (Discarded)

Value

0 (0)

Unit

Source

[-]

Doppler (Discarded)

Value

0 (0)

Unit

Source

[-]

Total Radar Observations (Discarded)

Value

0 (0)

Unit

Source

[-]

Note: The ASCII file is in a format suitable for Orbfit input.

Sources

No.	Name	Additional
[1]	ESA Aegis	ESA orbit determination and impact monitoring system
[2]	MPC	Minor Planet Center: https://www.minorplanetcenter.net

Filters

Initial Date: *

Final Date: *

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Max residual (arcsec):

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Computation parameters

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Initial Date: *

Final Date: *

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Note: Ephemerides requests are limited to a maximum of 1000 points and a final date not exceeding 2040/12/31 00:00.

Close Approaches for 1994WR12 from 1950 to 2126

Body	Date in UTC	Time uncert. in min	Nominal distance in au	Min. possible distance in au	Distance uncert. in au
EARTH	1951-12-13 12:10	3.5	0.0842018	0.0841905	0.0000038
EARTH	1953-12-28 09:58	3.6	0.0961566	0.0961562	0.0000001
EARTH	1956-01-11 15:33	2.2	0.0913746	0.0913732	0.0000005
EARTH	1958-01-17 16:11	< 1 min	0.1067774	0.1067606	0.0000056
EARTH	1960-01-18 22:12	< 1 min	0.1604742	0.1604439	0.0000101
VENUS	1968-12-17 19:41	< 1 min	0.0368648	0.0368373	0.0000092
VENUS	1975-05-13 09:36	< 1 min	0.0419515	0.0419478	0.0000012
VENUS	1977-07-28 08:01	< 1 min	0.0293469	0.0293407	0.0000021
EARTH	1990-11-22 19:03	< 1 min	0.1418532	0.1418502	0.0000010
EARTH	1992-11-21 19:51	< 1 s	0.0630320	0.0630305	0.0000005
EARTH	1994-11-24 20:21	< 1 s	0.0047469	0.0047467	0.0000001
MERCURY	1996-08-21 19:45	< 1 min	0.0159056	0.0159055	0.0000000
EARTH	1996-12-14 04:51	< 1 min	0.0856586	0.0856584	0.0000000
EARTH	1999-01-09 14:55	< 1 min	0.0918618	0.0918613	0.0000002
EARTH	2001-01-17 12:06	< 1 min	0.1400842	0.1400826	0.0000005
MERCURY	2006-07-07 10:12	< 1 min	0.0161136	0.0161135	0.0000000
VENUS	2013-11-14 03:26	< 1 min	0.0252244	0.0252242	0.0000001
MERCURY	2016-05-19 15:00	< 1 min	0.0156964	0.0156961	0.0000001
EARTH	2019-11-22 10:25	< 1 s	0.0737001	0.0736998	0.0000001
EARTH	2021-11-29 06:03	< 1 s	0.0411249	0.0411247	0.0000001
EARTH	2023-12-24 09:25	< 1 min	0.0947602	0.0947599	0.0000001
EARTH	2026-01-14 20:59	< 1 min	0.0957980	0.0957976	0.0000001
MERCURY	2026-04-08 15:59	< 1 min	0.0147797	0.0147795	0.0000001
EARTH	2028-01-17 20:42	< 1 min	0.1829037	0.1829029	0.0000003
MERCURY	2036-02-14 14:29	< 1 min	0.0136819	0.0136818	0.0000000
VENUS	2042-03-03 16:21	< 1 min	0.0274455	0.0274418	0.0000012
MERCURY	2043-05-22 15:49	< 1 min	0.0226750	0.0226657	0.0000031
EARTH	2044-11-21 22:29	< 1 min	0.1189068	0.1188965	0.0000034
MERCURY	2045-12-26 07:27	< 1 min	0.0278178	0.0278064	0.0000038
EARTH	2046-11-25 12:32	< 1 min	0.0109296	0.0109194	0.0000034
EARTH	2048-12-21 21:12	1.6	0.0934554	0.0934547	0.0000002
VENUS	2049-03-08 09:38	< 1 min	0.0444331	0.0444243	0.0000029
EARTH	2051-01-16 01:37	< 1 min	0.1008810	0.1008653	0.0000052
MERCURY	2053-03-18 16:37	5.8	0.0224245	0.0223462	0.0000261
MERCURY	2060-06-06 02:27	7.9	0.0496575	0.0494227	0.0000783
MERCURY	2065-01-24 07:14	13.1	0.0241461	0.0239033	0.0000810
EARTH	2067-11-22 20:29	2.0	0.0436439	0.0434494	0.0000648
EARTH	2069-12-08 10:18	14.8	0.0744171	0.0743446	0.0000241
EARTH	2072-01-08 10:44	7.3	0.0928709	0.0928669	0.0000013
MERCURY	2072-04-17 09:23	4.8	0.0353421	0.0352254	0.0000389
EARTH	2074-01-17 14:49	< 1 min	0.1523916	0.1523643	0.0000091
MERCURY	2079-07-09 05:42	7.7	0.0322309	0.0320466	0.0000614
VENUS	2080-12-04 23:50	3.3	0.0309061	0.0307612	0.0000484
MERCURY	2086-09-30 11:41	14.9	0.0481063	0.0476177	0.0001629
EARTH	2088-11-23 00:40	4.0	0.1756603	0.1752701	0.0001301
MERCURY	2089-05-02 14:06	21.8	0.0357331	0.0352430	0.0001635
EARTH	2090-11-23 13:38	8.6	0.0174071	0.0170326	0.0001248
EARTH	2092-12-09 16:25	5.0	0.0786330	0.0786233	0.0000032
EARTH	2095-01-06 08:31	40.1	0.0949623	0.0949084	0.0000181
MERCURY	2096-08-10 02:08	92.8	0.0100657	0.0099258	0.0000601
EARTH	2097-01-17 18:59	2.2	0.1257906	0.1251509	0.0002140
VENUS	2100-01-01 05:46	37.4	0.0442788	0.0422153	0.0006945
MERCURY	2106-06-27 11:19	256.6	0.0109973	0.0099970	0.0004426
MERCURY	2109-01-31 23:42	181.3	0.0384937	0.0342288	0.0014330
VENUS	2109-03-23 16:18	51.3	0.0405369	0.0370453	0.0011929
EARTH	2115-11-23 19:04	20.3	0.1141508	0.1103023	0.0012829
VENUS	2116-03-29 18:59	81.8	0.0419560	0.0414853	0.0002571
MERCURY	2116-05-13 05:24	310.1	0.0150639	0.0119547	0.0011483
EARTH	2117-11-26 10:21	175.4	0.0129424	0.0092740	0.0012239
MERCURY	2118-12-16 19:32	11.8	0.0469365	0.0463029	0.0002113
EARTH	2119-12-22 18:02	250.5	0.0942062	0.0940939	0.0000384
EARTH	2122-01-16 14:38	231.0	0.0983836	0.0963952	0.0007788
MERCURY	2126-03-09 16:53	1354.7	0.0362058	0.0125564	0.0102944

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
140.32389728	318.15423823	0.00110932	MINIMUM
212.93587381	5.82899283	0.09204696	MINIMUM
193.02497749	352.65824223	0.09553178	SADDLE
2.55486132	167.41188928	0.56179393	SADDLE
1.68429681	346.05890243	1.43942465	SADDLE
180.20206075	164.38146812	2.07296018	MAXIMUM

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MOID Plots

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