Asteroids

390725 2003HB help

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

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Aten

Perihelion (q)

0.527

Aphelion (Q)

1.173

Eccentricity (e)

0.380

Inclination (i)

18.1

deg

Orbit period (P)

286.1

Earth MOID

0.04718

U parameter

0.4

A₂

-49.5

10^-15au/days²

Next Earth close approach

Date

2036-05-18

Nominal distance (from Earth center)

0.19941

29831375

Maximum Brightness

19.7

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

19.7

mag

Diameter

200

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2003-04-21

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

0.849695

1-sigma variation

4.025E-9

Unit

Eccentricity (e)

Value

0.380338

1-sigma variation

6.763E-8

Unit

Inclination (i)

Value

18.1209

1-sigma variation

9.483E-6

Unit

Long. of Ascending Node (Ω)

Value

70.3397

1-sigma variation

1.624E-5

Unit

Arg. of Perihelion (ω)

Value

306.7573

1-sigma variation

1.567E-5

Unit

Mean Anomaly (M)

Value

130.68273

1-sigma variation

0.00001

Unit

Perihelion distance

Value

0.526524

1-sigma variation

Unit

Aphelion distance

Value

1.172866

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.393929

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.074604

1-sigma variation

Unit

MOID

Value

0.047180

1-sigma variation

Unit

Orbit Period

Value

286.0837

1-sigma variation

Unit

U parameter

Value

0.4

1-sigma variation

Unit

A₂

Value

-49.46223

1-sigma variation

6.96351

Unit

10^-15au/days²

Covariance Matrix

	a	e	i	Ω	ω	M	A₂
a	1.61983E-17	-1.55916E-16	-6.26500E-15	4.83012E-15	-2.06755E-15	-2.91908E-14	2.72228E-8
e	-1.55916E-16	4.57371E-15	1.74360E-13	-7.85390E-14	-6.42048E-14	7.89832E-13	-2.04642E-7
i	-6.26500E-15	1.74360E-13	8.99360E-11	-1.14330E-10	1.03982E-10	3.40008E-11	-8.92783E-6
Ω	4.83012E-15	-7.85390E-14	-1.14330E-10	2.63633E-10	-2.45325E-10	-3.31339E-11	6.44720E-6
ω	-2.06755E-15	-6.42048E-14	1.03982E-10	-2.45325E-10	2.45666E-10	-1.02486E-11	-4.72552E-6
M	-2.91908E-14	7.89832E-13	3.40008E-11	-3.31339E-11	-1.02486E-11	1.66744E-10	-3.73814E-5
A₂	2.72228E-8	-2.04642E-7	-8.92783E-6	6.44720E-6	-4.72552E-6	-3.73814E-5	4.84905E1

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

19.685

Unit

mag

Source

[1]

Slope Parameter (G)

Value

0.15**

Unit

mag

Source

[1]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

0.271

Unit

Source

[3]

[2]

Diameter

Value

200

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.) Mainzer, A.; Grav, T.; Masiero, J.; Hand, E.; et al. (2011) Astrophys. J. 741, A90. See also Grav 2012b and Masiero 2012.
[3]	EARN	1.) Mainzer, A. et al. (2011) ApJ 743, 156. (NEOWISE Observations of Near-Earth Objects: Preliminary Results) (albedo and diameters of 428 NEOs)

Observational Information

Arc Length
Unobserved
Normalized RMS of residuals

Arc Information

Value

Unit

Source

Arc Length

Value

8068

Unit

Source

[1]

Unobserved

Value

198

Unit

Source

[1]

Normalized RMS of residuals

Value

0.762448

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2003-04-21.24423

Unit

Source

[2]

Last Observation

Value

2025-05-23.402199

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

566 (4)

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 390725 2003HB 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	1960-05-20 19:34	< 1 min	0.1444471	0.1444292	0.0000060
EARTH	1967-05-25 08:41	< 1 min	0.1639482	0.1639353	0.0000043
EARTH	1978-05-25 05:52	< 1 min	0.0484244	0.0484227	0.0000006
EARTH	1996-05-26 03:48	< 1 s	0.1098589	0.1098572	0.0000005
EARTH	2007-05-23 18:12	< 1 s	0.0890969	0.0890966	0.0000001
EARTH	2025-05-25 14:27	< 1 s	0.0469817	0.0469815	0.0000001
EARTH	2036-05-18 21:51	< 1 min	0.1994104	0.1994085	0.0000006
EARTH	2043-05-27 00:56	< 1 s	0.0974390	0.0974354	0.0000012
EARTH	2054-05-22 14:38	< 1 min	0.1167548	0.1167469	0.0000026
EARTH	2061-05-23 22:45	< 1 min	0.1778776	0.1778670	0.0000035
EARTH	2072-05-24 21:22	< 1 min	0.0482489	0.0482421	0.0000023
EARTH	2090-05-26 20:03	< 1 min	0.0784400	0.0784007	0.0000131
EARTH	2101-05-23 10:06	< 1 min	0.1199103	0.1198547	0.0000185
EARTH	2108-05-24 02:39	1.7	0.1861549	0.1861028	0.0000174
EARTH	2119-05-27 07:47	< 1 min	0.0446150	0.0446077	0.0000024

Download as:

Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
245.38736047	142.03573599	0.04718014	MINIMUM
87.87319215	24.32320577	0.28115535	MINIMUM
154.50327480	78.59940662	0.34749793	SADDLE
345.75317525	257.33086593	0.51848385	SADDLE
351.67293848	86.45015362	1.51501630	SADDLE
181.07671859	277.06667387	2.15451220	MAXIMUM

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MOID Plots

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