Asteroids

387746 2003MH4 help

Last update: 2025-04-18 14:32 UTC

Orbital Properties

Epoch

60800.0

MJD

Orbit type

Apollo

Perihelion (q)

0.956

Aphelion (Q)

2.974

Eccentricity (e)

0.514

Inclination (i)

3.9

deg

Orbit period (P)

1006.0

Earth MOID

0.00284

U parameter

0.0

Next Earth close approach

Date

2025-05-24

Nominal distance (from Earth center)

0.04463

6676557

Maximum Brightness

mag

Risk

Object is not in risk list

Object is not in priority list

Physical Properties

Absolute Magnitude (H)

20.1

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

60800.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

1.964921

1-sigma variation

3.632E-9

Unit

Eccentricity (e)

Value

0.513548

1-sigma variation

2.222E-8

Unit

Inclination (i)

Value

3.9029

1-sigma variation

4.635E-6

Unit

Long. of Ascending Node (Ω)

Value

259.5294

1-sigma variation

0.0001

Unit

Arg. of Perihelion (ω)

Value

323.5639

1-sigma variation

0.0001

Unit

Mean Anomaly (M)

Value

359.02467

1-sigma variation

0.00001

Unit

Perihelion distance

Value

0.955840

1-sigma variation

Unit

Aphelion distance

Value

2.974002

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.008975

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

1.478993

1-sigma variation

Unit

MOID

Value

0.002840

1-sigma variation

Unit

Orbit Period

Value

1006.0418

1-sigma variation

Unit

U parameter

Value

0.0

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	1.31906E-17	-1.55550E-17	-9.29015E-15	-1.48481E-13	1.10574E-13	1.96088E-14
e	-1.55550E-17	4.93554E-16	-9.33510E-15	-3.99355E-14	1.29723E-14	6.54850E-14
i	-9.29015E-15	-9.33510E-15	2.14802E-11	3.02339E-10	-2.74534E-10	-1.80364E-11
Ω	-1.48481E-13	-3.99355E-14	3.02339E-10	7.43379E-9	-7.05568E-9	-2.23639E-10
ω	1.10574E-13	1.29723E-14	-2.74534E-10	-7.05568E-9	6.84147E-9	1.24054E-10
M	1.96088E-14	6.54850E-14	-1.80364E-11	-2.23639E-10	1.24054E-10	7.02185E-11

Date of computation: 2025-04-10 09:29 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

20.084

Unit

mag

Source

[1]

Slope Parameter (G)

Value

0.15**

Unit

mag

Source

[1]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

0.13

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

8094

Unit

Source

[1]

Unobserved

Value

Unit

Source

[1]

Normalized RMS of residuals

Value

0.54812

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

2025-03-25.152351

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

342 (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 2125

Body	Date in UTC	Time uncert. in min	Nominal distance in au	Min. possible distance in au	Distance uncert. in au
EARTH	1970-03-12 15:50	< 1 min	0.1907249	0.1907225	0.0000008
EARTH	1981-03-25 17:05	< 1 min	0.0817803	0.0817791	0.0000004
EARTH	1992-04-17 00:36	< 1 min	0.0649682	0.0649679	0.0000001
EARTH	2003-04-30 02:48	< 1 min	0.0690878	0.0690875	0.0000001
EARTH	2014-05-04 06:27	< 1 min	0.0661570	0.0661568	0.0000001
EARTH	2025-05-24 10:36	< 1 min	0.0446300	0.0446296	0.0000001
EARTH	2036-05-23 09:29	< 1 min	0.0498256	0.0498254	0.0000001
EARTH	2047-04-17 15:43	< 1 min	0.0668313	0.0668310	0.0000001
EARTH	2058-03-27 20:41	< 1 min	0.0770755	0.0770743	0.0000004
EARTH	2069-03-16 20:13	< 1 min	0.1620801	0.1620773	0.0000009
EARTH	2121-06-26 11:01	< 1 min	0.1189784	0.1189754	0.0000010

Download as:

Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
19.82960582	154.73874690	0.00283984	MINIMUM
345.43340158	94.55847445	0.06113071	MINIMUM
356.98120703	114.70979827	0.06664528	SADDLE
1.26387736	302.33227831	1.94677628	SADDLE
180.33823332	301.38341690	1.98378523	SADDLE
180.50526201	121.48234485	3.98172787	MAXIMUM

Download:

MOID Plots

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