Asteroids

139359 2001ME1 help

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

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Apollo

Perihelion (q)

0.343

Aphelion (Q)

4.926

Eccentricity (e)

0.870

Inclination (i)

6.0

deg

Orbit period (P)

1561.8

Earth MOID

0.01331

U parameter

0.0

Next Earth close approach

Date

2062-02-07

Nominal distance (from Earth center)

0.1174

17563032

Maximum Brightness

15.1

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

16.5

mag

Diameter

4940

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2001-06-16

Observatory

Lincoln Laboratory ETS, New Mexico

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

2.634415

1-sigma variation

4.089E-9

Unit

Eccentricity (e)

Value

0.869780

1-sigma variation

1.280E-8

Unit

Inclination (i)

Value

5.9556

1-sigma variation

4.817E-6

Unit

Long. of Ascending Node (Ω)

Value

84.5756

1-sigma variation

2.226E-5

Unit

Arg. of Perihelion (ω)

Value

302.3950

1-sigma variation

2.237E-5

Unit

Mean Anomaly (M)

Value

231.01339

1-sigma variation

1.746E-6

Unit

Perihelion distance

Value

0.343052

1-sigma variation

Unit

Aphelion distance

Value

4.925778

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.546829

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.184635

1-sigma variation

Unit

MOID

Value

0.013309

1-sigma variation

Unit

Orbit Period

Value

1561.7975

1-sigma variation

Unit

U parameter

Value

0.0

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	1.67239E-17	2.84350E-17	7.86761E-15	2.11481E-14	-1.10004E-14	-6.49667E-15
e	2.84350E-17	1.63724E-16	1.18564E-15	5.08684E-16	2.33148E-14	-4.07538E-15
i	7.86761E-15	1.18564E-15	2.32008E-11	-1.46529E-13	4.92181E-13	-2.64484E-12
Ω	2.11481E-14	5.08684E-16	-1.46529E-13	4.95707E-10	-4.92230E-10	-9.01740E-12
ω	-1.10004E-14	2.33148E-14	4.92181E-13	-4.92230E-10	5.00346E-10	5.45321E-12
M	-6.49667E-15	-4.07538E-15	-2.64484E-12	-9.01740E-12	5.45321E-12	3.04829E-12

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

[1]

[2]

Taxonomy (all)

Value

Unit

Source

[3]

[2]

Absolute Magnitude (H)
Slope Parameter (G)

H / G

Value

Unit

Source

Absolute Magnitude (H)

Value

16.469

Unit

mag

Source

[4]

Slope Parameter (G)

Value

0.15**

Unit

mag

Source

[4]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

0.02

0.04

Unit

Source

[5]

[2]

Diameter

Value

4940

Unit

Source

[5]

Color Index Information

Color Index Information

Value

Unit

Source

Color Index Information

Value

Unit

mag

Source

[-]

Sightings

Sightings

Value

Unit

Source

Sightings

Value

Radar R

Visual S

Unit

Source

[7]

[2]

Download this part as:

Sources

No.	Name	Additional
[1]	EARN	1.) N. G. Simion et al, Spectral properties of near-Earth objects with low-Jovian Tisserand invariant (2021)
[2]	EARN	1.) Rivkin, A.S. et al. (2005) Icarus 175, 175-180. (Constraining near-Earth object albedos using near-infrared spectroscopy) (1580,3103,29075,2001 ME1, 26760)
[3]	EARN	Earth Asteroids Research Node: https://earn.dlr.de
[4]	ESA Aegis	ESA orbit determination and impact monitoring system
[5]	EARN	1.) Joseph R. Masiero et al 2021 Planet. Sci. J. 2 162
[6]	EARN	1.) Calculated by the NEOCC based on the albedo value
[7]	EARN	1.) href="http://echo.jpl.nasa.gov/asteroids/index.html">JPL's NEO Radar Detection Program Webpage

Observational Information

Arc Length
Unobserved
Normalized RMS of residuals

Arc Information

Value

Unit

Source

Arc Length

Value

8772

Unit

Source

[1]

Unobserved

Value

138

Unit

Source

[1]

Normalized RMS of residuals

Value

0.60798

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2001-05-25.37205

Unit

Source

[2]

Last Observation

Value

2025-05-31.321307

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

769 (8)

Unit

Source

[1]

Radar Summary

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

Radar

Value

Unit

Source

First Observation

Value

2014-06-18

Unit

Source

[3]

Last Observation

Value

2014-06-18

Unit

Source

[3]

Delay (Discarded)

Value

1 (0)

Unit

Source

[1]

Doppler (Discarded)

Value

0 (0)

Unit

Source

[-]

Total Radar Observations (Discarded)

Value

1 (0)

Unit

Source

[1]

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
[3]	JPL Radar Observations	Jet Propulsion Laboratory: https://ssd.jpl.nasa.gov/dat/radar_data_ast.txt

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 139359 2001ME1 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
VENUS	1971-08-11 17:17	< 1 min	0.0461226	0.0461215	0.0000004
JUPITER	1981-12-11 17:24	< 1 min	0.6740341	0.6740334	0.0000002
EARTH	1993-02-02 03:17	< 1 s	0.1363413	0.1363407	0.0000002
EARTH	2001-06-29 12:31	< 1 s	0.0972728	0.0972725	0.0000001
JUPITER	2029-06-10 04:47	< 1 min	0.6277713	0.6277707	0.0000002
4 Vesta	2032-02-23 18:11	< 1 s	0.0148521	0.0148515	0.0000002
VENUS	2053-06-01 07:26	< 1 min	0.0470592	0.0470581	0.0000004
MERCURY	2057-08-29 07:23	< 1 min	0.0338333	0.0338313	0.0000007
MERCURY	2061-12-23 12:35	< 1 min	0.0389341	0.0389314	0.0000009
EARTH	2062-02-07 23:55	< 1 min	0.1174016	0.1174013	0.0000001
EARTH	2070-06-26 18:29	< 1 min	0.0704547	0.0704523	0.0000008
JUPITER	2076-11-28 02:54	< 1 min	0.6267056	0.6267050	0.0000002
EARTH	2083-06-21 05:24	< 1 min	0.1478566	0.1478519	0.0000016
EARTH	2096-06-25 12:06	< 1 min	0.1008265	0.1008235	0.0000010
EARTH	2109-07-03 04:50	< 1 min	0.1349566	0.1349480	0.0000029

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
314.88878808	169.36299692	0.01340297	MINIMUM
43.75980043	37.41902474	0.08487150	MINIMUM
358.25666481	280.93548892	0.65563875	SADDLE
358.36709363	101.36827574	1.34522095	SADDLE
179.85507669	104.65638875	3.92663033	SADDLE
179.92300204	284.67589176	5.91829900	MAXIMUM

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MOID Plots

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