Asteroids

1994WR12 help

Last update: 2025-09-10 00:30 UTC

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Aten

Perihelion (q)

0.456

Aphelion (Q)

1.058

Eccentricity (e)

0.397

Inclination (i)

6.8

deg

Orbit period (P)

240.5

Earth MOID

0.00147

U parameter

1.0

A₂

-217.4

10^-15au/days²

Next Earth close approach

Date

2026-01-14

Nominal distance (from Earth center)

0.0958

14331174

Maximum Brightness

20.2

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

61000.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

0.756765

1-sigma variation

8.001E-9

Unit

Eccentricity (e)

Value

0.397485

1-sigma variation

1.333E-7

Unit

Inclination (i)

Value

6.8465

1-sigma variation

9.509E-6

Unit

Long. of Ascending Node (Ω)

Value

62.5214

1-sigma variation

1.199E-5

Unit

Arg. of Perihelion (ω)

Value

206.0432

1-sigma variation

1.503E-5

Unit

Mean Anomaly (M)

Value

152.77084

1-sigma variation

0.00002

Unit

Perihelion distance

Value

0.455963

1-sigma variation

Unit

Aphelion distance

Value

1.057567

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.003806

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.544672

1-sigma variation

Unit

MOID

Value

0.001466

1-sigma variation

Unit

Orbit Period

Value

240.4584

1-sigma variation

Unit

U parameter

Value

1.0

1-sigma variation

Unit

A₂

Value

-217.38858

1-sigma variation

10.10000

Unit

10^-15au/days²

Covariance Matrix

	a	e	i	Ω	ω	M	A₂
a	6.40171E-17	-9.53203E-16	-5.04728E-14	-2.38236E-14	-6.82567E-14	4.60679E-15	8.06649E-8
e	-9.53203E-16	1.77704E-14	8.73300E-13	3.31826E-13	1.35653E-12	-8.39928E-13	-1.19611E-6
i	-5.04728E-14	8.73300E-13	9.04220E-11	7.62233E-11	1.43133E-11	-4.40532E-11	-6.05453E-5
Ω	-2.38236E-14	3.31826E-13	7.62233E-11	1.43800E-10	-6.60868E-11	-1.01740E-10	-2.47138E-5
ω	-6.82567E-14	1.35653E-12	1.43133E-11	-6.60868E-11	2.25794E-10	-1.51539E-10	-8.73867E-5
M	4.60679E-15	-8.39928E-13	-4.40532E-11	-1.01740E-10	-1.51539E-10	5.85535E-10	-3.54914E-6
A₂	8.06649E-8	-1.19611E-6	-6.05453E-5	-2.47138E-5	-8.73867E-5	-3.54914E-6	1.02009E2

Date of computation: 2025-09-10 00:30 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

22.351

Unit

mag

Source

[1]

Slope Parameter (G)

Value

0.15**

Unit

mag

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

[-]

Download this part as:

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

10645

Unit

Source

[1]

Unobserved

Value

621

Unit

Source

[1]

Normalized RMS of residuals

Value

0.636268

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

2024-01-18.188363

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

142 (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

Computation parameters

As seen from:

Initial Date: *

Final Date: *

Output option:

One line per time step

Time step:*

* - these fields are required

Close Approaches for 1994WR12 from 1950 to 2125

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	3.7	0.0842016	0.0841898	0.0000039
EARTH	1953-12-28 09:58	3.7	0.0961566	0.0961561	0.0000002
EARTH	1956-01-11 15:33	2.3	0.0913746	0.0913731	0.0000005
EARTH	1958-01-17 16:11	< 1 min	0.1067771	0.1067596	0.0000058
EARTH	1960-01-18 22:12	< 1 min	0.1604736	0.1604422	0.0000105
VENUS	1968-12-17 19:41	< 1 min	0.0368653	0.0368367	0.0000095
VENUS	1975-05-13 09:36	< 1 min	0.0419515	0.0419477	0.0000013
VENUS	1977-07-28 08:01	< 1 min	0.0293468	0.0293403	0.0000022
EARTH	1990-11-22 19:03	< 1 min	0.1418532	0.1418501	0.0000010
EARTH	1992-11-21 19:51	< 1 min	0.0630320	0.0630304	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	0.0918617	0.0918613	0.0000002
EARTH	2001-01-17 12:06	< 1 min	0.1400843	0.1400827	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	0.0736997	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	0.0947598	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	0.0147794	0.0000001
EARTH	2028-01-17 20:42	< 1 min	0.1829036	0.1829028	0.0000003
MERCURY	2036-02-14 14:29	< 1 min	0.0136819	0.0136818	0.0000000
VENUS	2042-03-03 16:21	< 1 min	0.0274456	0.0274419	0.0000013
MERCURY	2043-05-22 15:49	< 1 min	0.0226755	0.0226659	0.0000032
EARTH	2044-11-21 22:29	< 1 min	0.1189073	0.1188967	0.0000035
MERCURY	2045-12-26 07:27	< 1 min	0.0278172	0.0278054	0.0000039
EARTH	2046-11-25 12:32	< 1 min	0.0109291	0.0109186	0.0000035
EARTH	2048-12-21 21:13	1.6	0.0934554	0.0934547	0.0000002
VENUS	2049-03-08 09:38	< 1 min	0.0444326	0.0444236	0.0000030
EARTH	2051-01-16 01:37	< 1 min	0.1008818	0.1008657	0.0000054
MERCURY	2053-03-18 16:36	6.0	0.0224285	0.0223481	0.0000268
MERCURY	2060-06-06 02:26	8.1	0.0496696	0.0494284	0.0000804
MERCURY	2065-01-24 07:12	13.4	0.0241336	0.0238842	0.0000832
EARTH	2067-11-22 20:29	2.1	0.0436338	0.0434340	0.0000666
EARTH	2069-12-08 10:21	15.2	0.0744208	0.0743464	0.0000248
EARTH	2072-01-08 10:45	7.5	0.0928707	0.0928666	0.0000014
MERCURY	2072-04-17 09:22	4.9	0.0353361	0.0352162	0.0000400
EARTH	2074-01-17 14:49	< 1 min	0.1523930	0.1523650	0.0000093
MERCURY	2079-07-09 05:44	7.9	0.0322404	0.0320510	0.0000632
VENUS	2080-12-04 23:50	3.4	0.0309136	0.0307647	0.0000498
MERCURY	2086-09-30 11:43	15.4	0.0481316	0.0476296	0.0001674
EARTH	2088-11-23 00:41	4.1	0.1756805	0.1752797	0.0001336
MERCURY	2089-05-02 14:09	22.4	0.0357077	0.0352044	0.0001680
EARTH	2090-11-23 13:36	8.9	0.0174265	0.0170417	0.0001282
EARTH	2092-12-09 16:25	5.1	0.0786335	0.0786239	0.0000032
EARTH	2095-01-06 08:38	41.0	0.0949595	0.0949043	0.0000186
MERCURY	2096-08-10 01:53	95.2	0.0100565	0.0099188	0.0000601
EARTH	2097-01-17 18:59	2.2	0.1258237	0.1251683	0.0002193
VENUS	2100-01-01 05:40	38.4	0.0441713	0.0420591	0.0007112
MERCURY	2106-06-27 10:39	264.0	0.0109296	0.0099531	0.0004416
MERCURY	2109-01-31 23:13	186.0	0.0387162	0.0343192	0.0014775
VENUS	2109-03-23 16:10	52.7	0.0407222	0.0371219	0.0012305
EARTH	2115-11-23 19:01	20.9	0.1139515	0.1099732	0.0013262
VENUS	2116-03-29 18:46	84.6	0.0419168	0.0414733	0.0002553
MERCURY	2116-05-13 04:36	322.2	0.0148865	0.0117385	0.0011736
EARTH	2117-11-26 10:49	182.5	0.0131326	0.0093331	0.0012676
MERCURY	2118-12-16 19:33	4.9	0.0469739	0.0461332	0.0002804
EARTH	2119-12-22 17:28	234.6	0.0942008	0.0941076	0.0000319
EARTH	2122-01-16 14:00	229.4	0.0982663	0.0963376	0.0007558

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
140.22394892	320.21293698	0.00145248	MINIMUM
212.87211597	7.92515714	0.09204581	MINIMUM
192.93497000	354.73489525	0.09554421	SADDLE
2.36501877	169.37217660	0.56121817	SADDLE
1.50258214	348.03002235	1.43958495	SADDLE
180.11842432	166.45928179	2.07272293	MAXIMUM

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MOID Plots

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