Asteroids

387746 2003MH4 help

Last update: 2025-11-24 16:53 UTC

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Apollo

Perihelion (q)

0.956

Aphelion (Q)

2.970

Eccentricity (e)

0.513

Inclination (i)

3.9

deg

Orbit period (P)

1004.3

Earth MOID

0.00218

U parameter

0.0

Next Earth close approach

Date

2036-05-23

Nominal distance (from Earth center)

0.04983

7453788

Maximum Brightness

20.7

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

20.2

mag

Diameter

370

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2003-06-26

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

1.962716

1-sigma variation

2.941E-9

Unit

Eccentricity (e)

Value

0.513099

1-sigma variation

9.776E-9

Unit

Inclination (i)

Value

3.9106

1-sigma variation

2.697E-6

Unit

Long. of Ascending Node (Ω)

Value

259.4832

1-sigma variation

2.339E-5

Unit

Arg. of Perihelion (ω)

Value

323.5335

1-sigma variation

2.339E-5

Unit

Mean Anomaly (M)

Value

70.73336

1-sigma variation

3.357E-6

Unit

Perihelion distance

Value

0.955649

1-sigma variation

Unit

Aphelion distance

Value

2.969783

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.006906

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

1.476058

1-sigma variation

Unit

MOID

Value

0.002177

1-sigma variation

Unit

Orbit Period

Value

1004.3490

1-sigma variation

Unit

U parameter

Value

0.0

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	8.65230E-18	1.15699E-17	-4.46626E-16	-4.35391E-15	-1.12383E-14	7.81604E-15
e	1.15699E-17	9.55633E-17	8.66346E-17	-3.24193E-15	-1.87757E-14	5.45081E-15
i	-4.46626E-16	8.66346E-17	7.27158E-12	3.93797E-11	-3.86820E-11	-2.86457E-13
Ω	-4.35391E-15	-3.24193E-15	3.93797E-11	5.47027E-10	-5.25568E-10	-1.10756E-11
ω	-1.12383E-14	-1.87757E-14	-3.86820E-11	-5.25568E-10	5.46902E-10	-9.85296E-12
M	7.81604E-15	5.45081E-15	-2.86457E-13	-1.10756E-11	-9.85296E-12	1.12708E-11

Date of computation: 2025-11-24 16:53 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

20.157

Unit

mag

Source

[1]

Slope Parameter (G)

Value

0.15**

Unit

Source

[1]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

0.13

Unit

Source

[2]

Diameter

Value

370

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]	EARN	1.) Nugent, C.R. et al. (2015) Astrophys. J. 814_117 (13pp) (NEOWISE Reactivation Mission Year One: Preliminary Asteroid Diameters and Albedos)(201 NEOs)

Observational Information

Arc Length
Unobserved
Normalized RMS of residuals

Arc Information

Value

Unit

Source

Arc Length

Value

8250

Unit

Source

[1]

Unobserved

Value

146

Unit

Source

[1]

Normalized RMS of residuals

Value

0.498794

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2003-01-26.51337

Unit

Source

[2]

Last Observation

Value

2025-08-28.348396

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

607 (1)

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 387746 2003MH4 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	1970-03-12 15:50	< 1 min	0.1907229	0.1907220	0.0000003
EARTH	1981-03-25 17:05	< 1 min	0.0817794	0.0817789	0.0000002
EARTH	1992-04-17 00:36	< 1 min	0.0649682	0.0649681	0.0000000
EARTH	2003-04-30 02:48	< 1 min	0.0690878	0.0690877	0.0000000
EARTH	2014-05-04 06:27	< 1 min	0.0661570	0.0661569	0.0000000
EARTH	2025-05-24 10:36	< 1 min	0.0446304	0.0446303	0.0000000
EARTH	2036-05-23 09:29	< 1 min	0.0498255	0.0498253	0.0000001
EARTH	2047-04-17 15:44	< 1 min	0.0668314	0.0668313	0.0000000
EARTH	2058-03-27 20:42	< 1 min	0.0770743	0.0770740	0.0000001
EARTH	2069-03-16 20:13	< 1 min	0.1620773	0.1620766	0.0000002
EARTH	2121-06-26 11:01	< 1 min	0.1189813	0.1189805	0.0000003

Download as:

Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
20.16690575	156.12829849	0.00217676	MINIMUM
345.06154693	94.73714302	0.06160032	MINIMUM
357.21732561	115.93712801	0.06802397	SADDLE
1.33118628	303.26351333	1.94671300	SADDLE
180.36036827	302.26324877	1.97943291	SADDLE
180.52978466	122.36420361	3.97910690	MAXIMUM

Download:

MOID Plots

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