Asteroids

2013NJ4 help

Last update: 2025-09-10 00:30 UTC

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Apollo

Perihelion (q)

0.904

Aphelion (Q)

1.365

Eccentricity (e)

0.203

Inclination (i)

1.3

deg

Orbit period (P)

441.5

Earth MOID

0.00444

U parameter

7.2

Next Earth close approach

Date

2025-11-20

Nominal distance (from Earth center)

0.03283

4911798

Maximum Brightness

22.5

mag

Risk

Object is in risk list

Physical Properties

Absolute Magnitude (H)

27.1

mag

Diameter

10 - 22*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2013-07-02

Observatory

Pan-STARRS 1, Haleakala

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

1.134799

1-sigma variation

0.000213

Unit

Eccentricity (e)

Value

0.203281

1-sigma variation

0.000069

Unit

Inclination (i)

Value

1.3253

1-sigma variation

0.0025

Unit

Long. of Ascending Node (Ω)

Value

114.8765

1-sigma variation

0.2482

Unit

Arg. of Perihelion (ω)

Value

239.2044

1-sigma variation

0.2815

Unit

Mean Anomaly (M)

Value

43.70833

1-sigma variation

0.27631

Unit

Perihelion distance

Value

0.904116

1-sigma variation

Unit

Aphelion distance

Value

1.365482

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.229806

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.032004

1-sigma variation

Unit

MOID

Value

0.004444

1-sigma variation

Unit

Orbit Period

Value

441.5471

1-sigma variation

Unit

U parameter

Value

7.2

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	4.53855E-8	1.46090E-8	5.21965E-7	-5.28751E-5	5.99795E-5	5.88654E-5
e	1.46090E-8	4.70563E-9	1.68002E-7	-1.70193E-5	1.93069E-5	1.89472E-5
i	5.21965E-7	1.68002E-7	6.00310E-6	-6.08104E-4	6.89807E-4	6.76998E-4
Ω	-5.28751E-5	-1.70193E-5	-6.08104E-4	6.16007E-2	-6.98773E-2	-6.85796E-2
ω	5.99795E-5	1.93069E-5	6.89807E-4	-6.98773E-2	7.92662E-2	7.77939E-2
M	5.88654E-5	1.89472E-5	6.76998E-4	-6.85796E-2	7.77939E-2	7.63493E-2

Date of computation: 2025-09-10 00:30 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

27.148

Unit

mag

Source

[1]

Slope Parameter (G)

Value

0.15**

Unit

mag

Source

[1]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

0.05 - 0.25

Unit

Source

[2]

Diameter

Value

10 - 22*

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

[-]

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Sources

No.	Name	Additional
[1]	ESA Aegis	ESA orbit determination and impact monitoring system
[2]	Estimation	Estimated from absolute magnitude

Observational Information

Arc Length
Unobserved
Normalized RMS of residuals

Arc Information

Value

Unit

Source

Arc Length

Value

Unit

Source

[1]

Unobserved

Value

4507

Unit

Source

[1]

Normalized RMS of residuals

Value

0.574519

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2013-07-02.34042

Unit

Source

[2]

Last Observation

Value

2013-07-06.251231

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

14 (0)

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 2013NJ4 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	1952-12-03 00:43	> 1 d	0.1750911	0.0180630	0.0717217
EARTH	1958-10-29 02:09	> 1 w	0.0754164	0.0222051	0.0196228
EARTH	1964-07-11 13:18	> 1 d	0.0341526	0.0058208	0.0195447
EARTH	1970-06-24 11:33	1110.9	0.1561951	0.1012113	0.0183395
EARTH	1989-11-22 14:09	430.9	0.0247746	0.0195570	0.0021889
EARTH	1995-11-09 08:29	> 1 d	0.0553553	0.0361593	0.0066145
EARTH	2001-09-22 13:38	> 1 d	0.1049392	0.1025835	0.0007904
EARTH	2001-12-15 12:55	> 1 d	0.1788080	0.1628559	0.0053270
EARTH	2007-08-09 18:57	> 1 d	0.0860876	0.0806438	0.0018172
EARTH	2013-07-07 16:49	< 1 min	0.0100956	0.0100835	0.0000040
EARTH	2019-09-18 02:41	> 1 d	0.1029630	0.1023434	0.0002083
EARTH	2019-12-13 05:25	> 1 d	0.1829103	0.1745533	0.0027886
EARTH	2025-11-20 04:07	844.7	0.0328333	0.0208095	0.0052163
EARTH	2042-07-12 11:31	> 1 d	0.0290309	0.0044949	0.0168412
EARTH	2048-11-22 11:55	> 1 d	0.0720634	0.0195178	0.0436632
EARTH	2059-07-12 02:24	> 1 w	0.0245894	0.0037659	0.0780548
EARTH	2070-06-25 15:07	> 1 mo	0.1515645	0.0050154	0.6762416
EARTH	2076-11-20 16:37	> 1 mo	0.0594214	0.0200876	0.9304328
EARTH	2087-11-08 02:58	> 1 mo	0.0441917	0.0200728	0.4771818
EARTH	2098-08-29 02:37	> 1 mo	0.0971965	0.0484098	0.2178353
EARTH	2109-07-05 14:00	> 1 mo	0.0246415	0.0031229	1.3218740
EARTH	2115-11-20 20:17	> 1 mo	0.0307803	0.0200320	6.3446640

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
300.80984075	181.94887048	0.00455689	MINIMUM
51.32833125	313.46237554	0.01979916	MINIMUM
356.01113418	247.75250035	0.10331739	SADDLE
177.10652440	68.69245817	0.36892744	SADDLE
355.45115145	67.04824657	1.89783856	SADDLE
176.85840115	248.48354736	2.36787068	MAXIMUM

Download:

MOID Plots

Click on the images to zoom-in and zoom-out

Level lines of the squared distance function

2013NJ4

Date in UTC	MJD	σ	σ_imp	Distance ± Width in RE	Stretching in RE	IP	Impact energy	PS	TS
2108-07-09.468	91180.468	1.014	0.000	0.79 ± 0.011	3.98E7	2.50E-8	3.40E-2	-9.17	0


Based on 14 optical observations (of which 0 are rejected as outliers) from 2013/07/02.340 to 2013/07/06.251.
Coordinates are given on the Target Plane.
Unit is one Earth radius, but impact cross section has radius between 2.23 and 2.23 Earth radii.
Coordinates for LOV = EQU scaled= 1 second= F.
AstOD software version= 4.0, Date of computation=20250805 130500.123 UTC.

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Download Impactor Table as: