Asteroids

2012EN5 help

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

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Apollo

Perihelion (q)

0.715

Aphelion (Q)

1.340

Eccentricity (e)

0.304

Inclination (i)

3.9

deg

Orbit period (P)

380.3

Earth MOID

0.00097

U parameter

6.1

Next Earth close approach

Date

2037-03-12

Nominal distance (from Earth center)

0.08692

13003641

Maximum Brightness

25.2

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

27.2

mag

Diameter

10 - 21*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2012-03-14

Observatory

Catalina Sky 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

61000.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

1.027298

1-sigma variation

0.000024

Unit

Eccentricity (e)

Value

0.304219

1-sigma variation

0.000118

Unit

Inclination (i)

Value

3.9392

1-sigma variation

0.0018

Unit

Long. of Ascending Node (Ω)

Value

174.4035

1-sigma variation

0.0011

Unit

Arg. of Perihelion (ω)

Value

102.9426

1-sigma variation

0.0015

Unit

Mean Anomaly (M)

Value

345.05398

1-sigma variation

0.22231

Unit

Perihelion distance

Value

0.714775

1-sigma variation

Unit

Aphelion distance

Value

1.339821

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.004827

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.132847

1-sigma variation

Unit

MOID

Value

0.000968

1-sigma variation

Unit

Orbit Period

Value

380.3145

1-sigma variation

Unit

U parameter

Value

6.1

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	5.96164E-10	2.87715E-9	4.40650E-8	2.68570E-8	-2.81838E-8	-5.42787E-6
e	2.87715E-9	1.39804E-8	2.14303E-7	1.29260E-7	-1.26076E-7	-2.61747E-5
i	4.40650E-8	2.14303E-7	3.28750E-6	1.97890E-6	-1.91133E-6	-4.00838E-4
Ω	2.68570E-8	1.29260E-7	1.97890E-6	1.21124E-6	-1.30679E-6	-2.44601E-4
ω	-2.81838E-8	-1.26076E-7	-1.91133E-6	-1.30679E-6	2.37300E-6	2.58778E-4
M	-5.42787E-6	-2.61747E-5	-4.00838E-4	-2.44601E-4	2.58778E-4	4.94233E-2

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

27.221

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

10 - 21*

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

Unit

Source

[1]

Unobserved

Value

4938

Unit

Source

[1]

Normalized RMS of residuals

Value

0.461484

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2012-03-14.27316

Unit

Source

[2]

Last Observation

Value

2012-03-15.48476

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

88 (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

Close Approaches for 2012EN5 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	1970-03-10 13:46	> 1 mo	0.1578748	0.0000902	3.1613959
EARTH	1971-03-12 20:22	> 1 mo	0.1054051	0.0003937	1.7621802
EARTH	1972-03-13 22:55	> 1 w	0.0558103	0.0003537	0.2936171
EARTH	1973-03-15 16:06	> 1 mo	0.0124479	0.0008143	1.2117668
EARTH	1974-03-16 08:22	984.1	0.0019618	0.0008069	0.0203871
EARTH	1975-03-10 17:13	> 1 d	0.1690079	0.1105362	0.0195188
EARTH	1980-09-16 04:03	> 1 d	0.1935897	0.1571710	0.0123099
EARTH	1980-10-24 02:19	> 1 d	0.1937126	0.1538935	0.0132905
EARTH	1981-10-14 00:09	810.9	0.0395706	0.0323581	0.0081308
EARTH	1982-10-21 04:09	765.0	0.1471035	0.1067539	0.0135892
EARTH	2011-03-10 08:42	28.2	0.1623752	0.1608133	0.0005206
EARTH	2012-03-15 21:04	< 1 s	0.0036837	0.0036794	0.0000015
EARTH	2016-10-06 11:00	67.3	0.1687560	0.1644969	0.0014203
EARTH	2017-10-15 18:34	112.1	0.0901090	0.0849046	0.0017406
EARTH	2037-03-12 21:16	237.4	0.0869240	0.0732378	0.0045621
EARTH	2038-03-12 23:04	1013.7	0.1661811	0.1543518	0.0039436
EARTH	2042-10-12 09:33	146.1	0.0296964	0.0291703	0.0003577
EARTH	2063-03-17 17:30	189.3	0.0252517	0.0144176	0.0036183
EARTH	2067-10-09 00:50	179.6	0.0878844	0.0717364	0.0054474
EARTH	2068-10-19 14:19	289.6	0.1852746	0.1630879	0.0074106
EARTH	2087-03-13 00:41	> 1 d	0.0992265	0.0018167	0.0355171
EARTH	2088-03-13 09:33	> 1 d	0.1640522	0.0594479	0.0349752
EARTH	2092-10-13 11:23	> 1 d	0.0461009	0.0293851	0.0306615
EARTH	2111-03-13 19:16	> 1 d	0.1130508	0.0339019	0.0264217
EARTH	2112-03-16 00:16	> 1 d	0.1593545	0.0728132	0.0288674
EARTH	2116-10-15 21:51	> 1 d	0.0735548	0.0296605	0.0382629

Download as:

Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
275.89899205	72.20402204	0.00114847	MINIMUM
83.54492568	277.43529616	0.02876694	MINIMUM
359.77660256	174.69980521	0.30676450	SADDLE
179.68754813	354.96123631	0.36432599	SADDLE
0.21998384	355.32602904	1.69760544	SADDLE
180.26040081	175.37735093	2.35478900	MAXIMUM

Download:

MOID Plots

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