Asteroids

2012EP10 help

Last update: 2026-03-17 23:26 UTC

Orbital Properties

Epoch

61200.0

MJD

Orbit type

Apollo

Perihelion (q)

0.927

Aphelion (Q)

1.169

Eccentricity (e)

0.115

Inclination (i)

1.0

deg

Orbit period (P)

391.8

Earth MOID

0.00235

U parameter

7.7

Next Earth close approach

Date

2039-10-01

Nominal distance (from Earth center)

0.15999

23933980

Maximum Brightness

28.1

mag

Risk

Object is in risk list

Physical Properties

Absolute Magnitude (H)

29.1

mag

Diameter

4 - 9*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2012-03-15

Observatory

Mt. Lemmon Survey

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

1.047901

1-sigma variation

0.000418

Unit

Eccentricity (e)

Value

0.115176

1-sigma variation

0.000079

Unit

Inclination (i)

Value

1.0448

1-sigma variation

0.0034

Unit

Long. of Ascending Node (Ω)

Value

347.1268

1-sigma variation

0.0408

Unit

Arg. of Perihelion (ω)

Value

104.7615

1-sigma variation

0.1615

Unit

Mean Anomaly (M)

Value

150.21768

1-sigma variation

0.04563

Unit

Perihelion distance

Value

0.927208

1-sigma variation

Unit

Aphelion distance

Value

1.168595

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.057820

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.012072

1-sigma variation

Unit

MOID

Value

0.002350

1-sigma variation

Unit

Orbit Period

Value

391.8132

1-sigma variation

Unit

U parameter

Value

7.7

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	1.74426E-7	3.29820E-8	-1.42761E-6	1.70503E-5	6.74387E-5	1.90548E-5
e	3.29820E-8	6.28457E-9	-2.69577E-7	3.22813E-6	1.27406E-5	3.60442E-6
i	-1.42761E-6	-2.69577E-7	1.16874E-5	-1.39518E-4	-5.52049E-4	-1.55946E-4
Ω	1.70503E-5	3.22813E-6	-1.39518E-4	1.66704E-3	6.59123E-3	1.86275E-3
ω	6.74387E-5	1.27406E-5	-5.52049E-4	6.59123E-3	2.60767E-2	7.36691E-3
M	1.90548E-5	3.60442E-6	-1.55946E-4	1.86275E-3	7.36691E-3	2.08165E-3

Date of computation: 2026-03-17 23:26 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

29.106

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

4 - 9*

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

Unit

Source

[1]

Unobserved

Value

5106

Unit

Source

[1]

Normalized RMS of residuals

Value

0.494936

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2012-03-15.27159

Unit

Source

[2]

Last Observation

Value

2012-03-28.301474

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

31 (0)

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

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 2012EP10 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	1956-08-27 03:16	> 1 mo	0.1988690	0.0061205	2.9342320
EARTH	1957-09-13 22:53	> 1 mo	0.0281031	0.0016641	4.5954438
EARTH	1958-05-20 17:41	> 1 mo	0.1256276	0.0295812	0.7078423
EARTH	1959-02-16 11:22	> 1 mo	0.0184075	0.0044750	1.1349957
EARTH	1977-09-13 12:10	1400.0	0.0092149	0.0006609	0.0039405
EARTH	1978-06-29 17:09	> 1 w	0.1112695	0.1054201	0.0019498
EARTH	1978-12-22 14:03	> 1 w	0.0749759	0.0700945	0.0016276
EARTH	1979-04-24 04:47	> 1 w	0.0945881	0.0837488	0.0036175
EARTH	1980-03-05 01:43	1057.4	0.0675498	0.0262955	0.0137658
EARTH	2009-09-11 04:52	42.9	0.0414872	0.0368050	0.0015608
EARTH	2010-07-17 07:00	> 1 d	0.0983356	0.0977430	0.0001975
EARTH	2010-11-27 15:21	> 1 d	0.0771892	0.0769491	0.0000800
EARTH	2011-05-16 09:11	1016.0	0.1088798	0.1080883	0.0002639
EARTH	2012-03-02 04:11	1.4	0.0035598	0.0035508	0.0000030
EARTH	2025-08-10 04:57	> 1 d	0.1286371	0.1225555	0.0020320
EARTH	2026-02-12 07:14	> 1 d	0.0352296	0.0224844	0.0042490
EARTH	2039-10-01 13:39	> 1 d	0.1599888	0.0238388	0.0457855
EARTH	2040-07-02 07:19	> 1 mo	0.1511768	0.1402144	0.0036996
EARTH	2041-03-08 05:07	> 1 d	0.0803705	0.0015718	0.0487001
EARTH	2054-11-21 17:02	> 1 mo	0.0504963	0.0074156	0.0271392
EARTH	2055-04-28 04:20	> 1 mo	0.1200229	0.0376700	0.0278072
EARTH	2068-10-07 17:27	> 1 d	0.0444003	0.0097121	0.0774835
EARTH	2069-06-03 05:23	> 1 mo	0.1474001	0.1066034	0.0135992
EARTH	2070-03-14 19:04	> 1 d	0.1905548	0.1233638	0.0224143
EARTH	2083-10-11 06:42	> 1 mo	0.0159890	0.0097911	0.4490009
EARTH	2084-06-09 03:24	> 1 mo	0.1386792	0.0829074	0.1495942
EARTH	2085-03-17 22:29	> 1 mo	0.1302278	0.0118865	1.0688894
EARTH	2100-10-01 05:49	> 1 mo	0.1781212	0.0090672	17.8541959
EARTH	2101-07-26 09:39	> 1 mo	0.1307189	0.0526371	4.1010681
EARTH	2102-02-26 06:45	> 1 mo	0.0306080	0.0027682	16.6059654
EARTH	2119-10-03 10:01	> 1 mo	0.0813623	0.0089443	315.1638878
EARTH	2120-07-03 17:50	> 1 mo	0.1355759	0.1036374	13.7486225
EARTH	2121-03-10 13:35	> 1 mo	0.0147875	0.0017229	257.6398466

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
61.56669227	59.10906666	0.00212302	MINIMUM
295.03965174	282.16643139	0.01036777	MINIMUM
357.80548399	350.07854786	0.05775737	SADDLE
178.59326682	170.97691987	0.15572151	SADDLE
358.50316804	170.85431938	1.94636534	SADDLE
178.94190905	351.29628549	2.15616823	MAXIMUM

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MOID Plots

Click on the images to zoom-in and zoom-out

Level lines of the squared distance function

2012EP10

Date in UTC	MJD	σ	Distance ± Width in RE	Stretching in RE	IP	Impact energy	PS
2072-03-05.017	77906.017	-3.793	3.39 ± 0.077	1.60E4	1.55E-7	2.65E-3	-9.03
2074-03-04.268	78635.268	1.977	3.98 ± 0.005	1.73E5	6.06E-7	2.66E-3	-8.45
2079-03-04.466	80461.466	3.977	4.00 ± 0.029	4.17E6	6.26E-11	2.65E-3	-12.48
2080-03-03.899	80826.899	4.519	2.38 ± 0.006	3.41E5	2.88E-10	2.66E-3	-11.82
2081-03-02.134	81190.134	1.408	1.70 ± 0.000	1.01E8	1.11E-8	2.65E-3	-10.24
2083-02-27.136	81917.136	1.219	1.31 ± 0.004	1.08E6	1.36E-6	2.65E-3	-8.17
2085-02-22.145	82643.145	2.120	3.69 ± 0.084	2.34E5	1.17E-6	2.66E-3	-8.25
2088-03-04.101	83749.101	3.777	2.47 ± 0.038	3.04E6	7.08E-10	2.66E-3	-11.49
2088-03-05.165	83750.165	-3.903	3.02 ± 0.066	2.99E4	5.04E-8	2.64E-3	-9.64
2089-03-04.880	84114.880	-3.718	2.04 ± 0.005	3.16E4	9.03E-8	2.65E-3	-9.39
2090-03-05.020	84480.020	-3.768	0.91 ± 0.113	3.03E5	8.68E-9	2.65E-3	-10.41
2092-03-03.517	85209.517	1.989	2.10 ± 0.011	2.82E5	1.39E-6	2.66E-3	-8.22
2094-03-03.181	85939.181	0.660	1.03 ± 0.836	7.43E6	3.46E-7	2.66E-3	-8.84
2094-03-04.980	85940.980	3.198	1.43 ± 0.592	3.03E6	6.15E-9	2.65E-3	-10.59
2096-02-21.547	86659.547	-1.383	3.13 ± 0.009	1.79E4	4.69E-5	2.64E-3	-6.72
2099-03-05.101	87767.101	0.890	4.06 ± 0.007	2.20E5	1.40E-6	2.65E-3	-8.26
2099-03-05.293	87767.293	0.774	3.32 ± 0.001	1.58E6	9.24E-7	2.65E-3	-8.44
2101-03-05.107	88497.107	-0.021	0.83 ± 0.127	1.88E6	1.69E-6	2.66E-3	-8.19
2102-02-24.456	88853.456	2.607	2.94 ± 0.000	1.85E7	4.15E-9	2.65E-3	-10.80
2103-03-06.594	89228.594	-3.888	3.33 ± 0.009	7.64E5	1.36E-9	2.65E-3	-11.29
2105-03-05.946	89958.946	-3.926	1.31 ± 0.134	1.80E5	7.87E-9	2.64E-3	-10.54
2107-03-04.582	90687.582	1.948	3.82 ± 0.064	9.39E6	3.80E-8	2.66E-3	-9.87
2107-03-05.618	90688.618	-3.736	0.99 ± 0.237	1.42E6	2.08E-9	2.65E-3	-11.13
2107-03-05.969	90688.969	1.848	4.00 ± 0.013	3.25E6	3.98E-8	2.66E-3	-9.85
2109-02-28.952	91414.952	4.268	3.58 ± 0.009	3.88E6	4.67E-11	2.66E-3	-12.79
2109-03-05.143	91419.143	1.964	1.52 ± 0.470	1.08E6	4.33E-7	2.66E-3	-8.82
2111-02-21.230	92137.230	-1.364	2.30 ± 0.008	1.05E6	1.03E-6	2.64E-3	-8.46
2111-02-21.381	92137.381	-1.330	2.39 ± 0.013	2.63E6	4.21E-7	2.66E-3	-8.84
2111-03-01.638	92145.638	1.270	2.06 ± 0.000	4.53E7	2.83E-8	2.65E-3	-10.02
2112-02-21.442	92502.442	-1.370	2.63 ± 0.007	2.48E6	4.06E-7	2.66E-3	-8.86
2113-02-20.768	92867.768	-1.372	1.91 ± 0.090	6.10E6	1.87E-7	2.66E-3	-9.20
2113-02-25.337	92872.337	-0.318	2.91 ± 0.007	7.70E6	2.86E-7	2.65E-3	-9.02
2113-02-27.236	92874.236	-2.787	1.56 ± 0.011	5.47E6	1.14E-8	2.65E-3	-10.42
2114-02-21.142	93233.142	-1.374	1.02 ± 0.054	1.18E7	1.05E-7	2.65E-3	-9.46
2114-03-01.628	93241.628	-3.897	1.73 ± 0.000	1.11E7	1.37E-10	2.64E-3	-12.35
2114-03-05.706	93245.706	-4.868	2.23 ± 0.017	1.15E6	1.75E-11	2.64E-3	-13.24
2115-03-05.495	93610.495	0.875	3.60 ± 0.007	1.80E6	6.83E-7	2.65E-3	-8.65
2115-03-05.594	93610.594	0.893	3.16 ± 0.008	2.22E6	6.40E-7	2.66E-3	-8.68
2116-02-25.419	93967.419	-2.907	3.92 ± 0.016	2.11E7	6.92E-10	2.66E-3	-11.65
2116-03-01.644	93972.644	1.426	3.49 ± 0.000	1.24E8	5.26E-9	2.64E-3	-10.77
2116-03-04.855	93975.855	0.775	3.63 ± 0.000	6.94E7	1.74E-8	2.64E-3	-10.25
2117-02-22.191	94330.191	-1.414	1.85 ± 0.026	2.94E6	3.70E-7	2.65E-3	-8.93
2117-03-04.938	94340.938	0.877	1.45 ± 0.173	4.75E6	4.61E-7	2.65E-3	-8.83
2117-03-05.315	94341.315	-0.030	1.08 ± 0.170	7.14E6	4.40E-7	2.66E-3	-8.85
2118-03-04.957	94705.957	-0.015	3.19 ± 0.005	4.37E5	4.73E-6	2.66E-3	-7.83
2119-03-05.132	95071.132	-0.019	2.18 ± 0.022	1.29E7	2.18E-7	2.65E-3	-9.17
2120-02-16.829	95419.829	-1.523	2.62 ± 0.217	4.22E5	2.44E-6	2.65E-3	-8.12
2120-03-04.948	95436.948	-3.887	4.01 ± 0.000	2.74E7	1.47E-11	2.64E-3	-13.34
2121-03-03.438	95800.438	0.614	2.63 ± 0.346	1.39E7	1.93E-7	2.66E-3	-9.23
2121-03-06.168	95803.168	-3.940	2.96 ± 0.011	4.92E5	2.05E-9	2.64E-3	-11.20


Based on 31 optical observations (of which 0 are rejected as outliers) from 2012/03/15.272 to 2012/03/28.301.
Coordinates are given on the Target Plane.
Unit is one Earth radius, but impact cross section has radius between 4.14 and 4.14 Earth radii.
Coordinates for LOV = EQU scaled= 1 second= F.
AstOD software version= 4.0, Date of computation=20250805 130500.123 UTC.

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