Asteroids

3988 Huma help

Last update: 2026-04-19 12:46 UTC

Orbital Properties

Epoch

61200.0

MJD

Orbit type

Amor

Perihelion (q)

1.055

Aphelion (Q)

2.034

Eccentricity (e)

0.317

Inclination (i)

10.8

deg

Orbit period (P)

701.0

Earth MOID

0.17761

U parameter

0.0

Next Earth close approach

Date

2082-09-16

Nominal distance (from Earth center)

0.19784

29596317

Maximum Brightness

16.7

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

17.9

mag

Diameter

800

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

1986-06-04

Observatory

Palomar Mountain

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

61200.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

1.544409

1-sigma variation

3.393E-9

Unit

Eccentricity (e)

Value

0.316866

1-sigma variation

3.132E-8

Unit

Inclination (i)

Value

10.7665

1-sigma variation

3.996E-6

Unit

Long. of Ascending Node (Ω)

Value

229.7632

1-sigma variation

2.181E-5

Unit

Arg. of Perihelion (ω)

Value

86.9840

1-sigma variation

2.342E-5

Unit

Mean Anomaly (M)

Value

264.36680

1-sigma variation

0.00001

Unit

Perihelion distance

Value

1.055039

1-sigma variation

Unit

Aphelion distance

Value

2.033779

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.356773

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.422720

1-sigma variation

Unit

MOID

Value

0.177613

1-sigma variation

Unit

Orbit Period

Value

701.0386

1-sigma variation

Unit

U parameter

Value

0.0

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	1.15133E-17	2.02446E-18	-7.88998E-16	-2.95169E-15	1.74915E-14	-4.04331E-14
e	2.02446E-18	9.81053E-16	-1.23857E-14	3.22879E-14	-6.66546E-14	-2.13661E-15
i	-7.88998E-16	-1.23857E-14	1.59685E-11	1.69311E-11	-1.99825E-11	6.53854E-12
Ω	-2.95169E-15	3.22879E-14	1.69311E-11	4.75750E-10	-4.83890E-10	2.24769E-11
ω	1.74915E-14	-6.66546E-14	-1.99825E-11	-4.83890E-10	5.48719E-10	-9.97010E-11
M	-4.04331E-14	-2.13661E-15	6.53854E-12	2.24769E-11	-9.97010E-11	1.64941E-10

Date of computation: 2026-04-19 12:46 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

[5]

Quality

Value

Unit

Source

[5]

Amplitude

Value

0.2

Unit

mag

Source

[5]

Rotation Direction

Value

Unit

Source

[-]

Spinvector L

Value

Unit

Source

[-]

Spinvector B

Value

Unit

Source

[-]

Taxonomy
Taxonomy (all)

Taxonomy

Value

Unit

Source

Taxonomy

Value

Scomp

Unit

Source

[1]

[2]

Taxonomy (all)

Value

Ld;Sl

Unit

Source

[3]

[4]

Absolute Magnitude (H)
Slope Parameter (G)

H / G

Value

Unit

Source

Absolute Magnitude (H)

Value

17.97

17.949

Unit

mag

Source

[6]

[7]

Slope Parameter (G)

Value

0.15**

Unit

Source

[7]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

medium

Unit

Source

[8]

Diameter

Value

800

Unit

Source

[8]

Color Index Information

Color Index Information

Value

Unit

Source

Color Index Information

Value

0.96

0.52

0.46

Unit

B-V

V-R

R-I

Source

[9]

Sightings

Sightings

Value

Unit

Source

Sightings

Value

Visual S

Unit

Source

[10]

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Sources

No.	Name	Additional
[1]	EARN	1.) Alexey V. Sergeyev and Benoit Carry A&A, 652 (2021) A59
[2]	EARN	1.) DeMeo, F.E. et al. (2014) Icarus 227, 112-122. (Mars encounters cause fresh surfaces on some near-Earth asteroids) (contains taxonomic classification of 249 NEAs)
[3]	EARN	Earth Asteroids Research Node: https://earn.dlr.de
[4]	EARN	1.) Hicks, M. et al. (2011) href="http://www.astronomerstelegram.org/?read=3457"> ATel#3457 (Broadband photometry of 3988 (1986 LA): A large low-deltaV near-Earth Asteroid) 2.) Hicks, M. et al. (2011) href="http://www.astronomerstelegram.org/?read=3678"> ATel#3678 (Palomar Spectroscopy of Near-Earth Asteroids 2004 SV55, 2000 SP43, 3988 (1986 LA), 1036 Ganymed, and 2002 AG29) 3.) Truong, T. et al. (2012) AAS 219, 432.15. (Physical Characterization of Near-Earth Object 3988 (1986 LA) 4.) DeMeo, F.E. et al. (2014) Icarus 227, 112-122. (Mars encounters cause fresh surfaces on some near-Earth asteroids) (contains taxonomic classification of 249 NEAs)
[5]	EARN	1.) Harris(JPL), A.W. unpublished data
[6]	EARN	1.) Hicks, M. et al. (2011) href="http://www.astronomerstelegram.org/?read=3457"> ATel#3457 (Broadband photometry of 3988 (1986 LA): A large low-deltaV near-Earth Asteroid) 2.) Truong, T. et al. (2012) AAS 219, 432.15. (Physical Characterization of Near-Earth Object 3988 (1986 LA)
[7]	ESA Aegis	ESA orbit determination and impact monitoring system
[8]	EARN	1.) Binzel, R.P. et al. (2002) in "Asteroids III" (Eds. W.F.Bottke et al.), Univ.Ariz.Press, Tucson, USA, pp. 255-271. (Physical Properties of NEOs)
[9]	EARN	1.) Hicks, M. et al. (2011) href="http://www.astronomerstelegram.org/?read=3457"> ATel#3457 (Broadband photometry of 3988 (1986 LA): A large low-deltaV near-Earth Asteroid)
[10]	EARN	1.) Hicks, M. et al. (2011) href="http://www.astronomerstelegram.org/?read=3678"> ATel#3678 (Palomar Spectroscopy of Near-Earth Asteroids 2004 SV55, 2000 SP43, 3988 (1986 LA), 1036 Ganymed, and 2002 AG29)

Observational Information

Arc Length
Unobserved
Normalized RMS of residuals

Arc Information

Value

Unit

Source

Arc Length

Value

14563

Unit

Source

[1]

Unobserved

Value

Unit

Source

[1]

Normalized RMS of residuals

Value

0.449489

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

1986-06-04.2993

Unit

Source

[2]

Last Observation

Value

2026-04-18.177051

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

631 (3)

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

Note: Ephemerides requests are limited to a maximum of 1000 points and a final date not exceeding 2040/12/31 00:00.

Close Approaches for 3988 Huma 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	1963-06-27 16:38	< 1 min	0.1785340	0.1785336	0.0000001
EARTH	2011-06-27 09:01	< 1 min	0.1853425	0.1853423	0.0000001
EARTH	2082-09-16 03:22	< 1 min	0.1978392	0.1978383	0.0000003

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
331.04874724	172.27874984	0.17761251	MINIMUM
24.26876031	246.84194019	0.19336376	MINIMUM
4.18227094	218.77587808	0.19862864	SADDLE
179.61952201	31.75716861	1.08083794	SADDLE
358.83607290	31.10880724	2.03204178	SADDLE
179.11834420	211.38532772	3.03618463	MAXIMUM

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MOID Plots

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