Asteroids

159857 2004LJ1 help

Last update: 2026-07-30 09:40 UTC

Orbital Properties

Epoch

61200.0

MJD

Orbit type

Apollo

Perihelion (q)

0.919

Aphelion (Q)

3.605

Eccentricity (e)

0.594

Inclination (i)

23.2

deg

Orbit period (P)

1242.7

Earth MOID

0.01490

U parameter

0.0

Next Earth close approach

Date

2038-11-16

Nominal distance (from Earth center)

0.01983

2967132

Maximum Brightness

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

15.4

mag

Diameter

3070

Taxonomic type

Rotation period (T)

2.661

Discovery Information

Discovery Date

2004-06-10

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

61200.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

2.262046

1-sigma variation

1.406E-9

Unit

Eccentricity (e)

Value

0.593557

1-sigma variation

1.107E-8

Unit

Inclination (i)

Value

23.1518

1-sigma variation

3.500E-6

Unit

Long. of Ascending Node (Ω)

Value

235.5196

1-sigma variation

5.944E-6

Unit

Arg. of Perihelion (ω)

Value

140.0062

1-sigma variation

6.458E-6

Unit

Mean Anomaly (M)

Value

133.16978

1-sigma variation

1.331E-6

Unit

Perihelion distance

Value

0.919392

1-sigma variation

Unit

Aphelion distance

Value

3.604699

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

1.675656

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.018121

1-sigma variation

Unit

MOID

Value

0.014897

1-sigma variation

Unit

Orbit Period

Value

1242.6548

1-sigma variation

Unit

U parameter

Value

0.0

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	1.97573E-18	4.55192E-18	1.17086E-15	1.75215E-15	-2.09597E-15	-7.68715E-16
e	4.55192E-18	1.22455E-16	3.60839E-15	1.37391E-14	-8.36765E-15	-1.08694E-15
i	1.17086E-15	3.60839E-15	1.22522E-11	5.33469E-12	-3.15397E-12	-1.25524E-12
Ω	1.75215E-15	1.37391E-14	5.33469E-12	3.53281E-11	-3.33497E-11	9.15785E-13
ω	-2.09597E-15	-8.36765E-15	-3.15397E-12	-3.33497E-11	4.17088E-11	-3.70570E-12
M	-7.68715E-16	-1.08694E-15	-1.25524E-12	9.15785E-13	-3.70570E-12	1.77060E-12

Date of computation: 2026-07-30 09:40 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

2.661

Unit

Source

[2]

Quality

Value

Unit

Source

[2]

Amplitude

Value

0.15-0.6

Unit

mag

Source

[2]

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]

Taxonomy (all)

Value

Unit

Source

[1]

Absolute Magnitude (H)
Slope Parameter (G)

H / G

Value

Unit

Source

Absolute Magnitude (H)

Value

15.431

Unit

mag

Source

[3]

Slope Parameter (G)

Value

0.15**

Unit

Source

[3]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

0.13

Unit

Source

[4]

Diameter

Value

3070

Unit

Source

[4]

Color Index Information

Color Index Information

Value

Unit

Source

Color Index Information

Value

Unit

mag

Source

[-]

Sightings

Sightings

Value

Unit

Source

Sightings

Value

Visual S

Unit

Source

[5]

Download this part as:

Sources

No.	Name	Additional
[1]	EARN	1.) Ieva, S. et al. (2018) Astron. Astrophys. 615, A127. (Photometric survey of 67 near-Earth objects)
[2]	EARN	1.) Warner, B.D. (2015) MPB 42, 41-53. (NEAR-EARTH ASTEROID LIGHTCURVE ANALYSIS AT CS3-PALMER DIVIDE STATION: 2014 JUNE-OCTOBER) (45 NEAs) 2.) Galad, A. et al. (2005) Earth, Moon and Planets 97, 147-163. (Joint lightcurve observations of 10 near-Earth asteroids from Modra and Ondrejov) (3553,22753,31669,40267, 66146,88188,103067,1001CB21,2004LJ1,2004XO14,) 3.) Petr Pravec's Ondrejov NEO Photometric Program Webpage "Prepublished Periods"
[3]	ESA Aegis	ESA orbit determination and impact monitoring system
[4]	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)
[5]	EARN	1.) deLeon, J. et al. (2010) Astron. Astrophys 517, A23. (Observations, compositional, and physical characterization of near-Earth and Mars-crosser asteroids from a spectroscopic survey)

Observational Information

Arc Length
Unobserved
Normalized RMS of residuals

Arc Information

Value

Unit

Source

Arc Length

Value

11389

Unit

Source

[1]

Unobserved

Value

216

Unit

Source

[1]

Normalized RMS of residuals

Value

0.379137

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

1995-02-03.56854

Unit

Source

[2]

Last Observation

Value

2026-04-11.05664

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

3075 (24)

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

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Normalised Only accepted

Max residual (arcsec):

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Computation parameters

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Initial Date: *

Final Date: *

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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 159857 2004LJ1 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	2021-11-03 08:24	< 1 s	0.1569319	0.1569317	0.0000001
7 Iris	2034-07-14 10:30	< 1 min	0.0119670	0.0119666	0.0000001
EARTH	2038-11-16 13:42	< 1 s	0.0198341	0.0198339	0.0000000
EARTH	2055-11-22 16:43	< 1 min	0.0892633	0.0892561	0.0000024

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
20.15522019	310.71291729	0.01489737	MINIMUM
355.27648497	85.25005728	1.90048766	SADDLE
177.32541469	91.86557685	2.64974735	SADDLE
180.98529994	273.68536877	4.57850041	MAXIMUM

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MOID Plots

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