Asteroids

163348 2002NN4 help

Last update: 2025-09-23 13:32 UTC

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Aten

Perihelion (q)

0.495

Aphelion (Q)

1.256

Eccentricity (e)

0.435

Inclination (i)

5.4

deg

Orbit period (P)

299.4

Earth MOID

0.00652

U parameter

0.0

A₂

32.5

10^-15au/days²

Next Earth close approach

Date

2029-06-07

Nominal distance (from Earth center)

0.05886

8805632

Maximum Brightness

17.8

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

mag

Diameter

590

Taxonomic type

Rotation period (T)

14.5

Discovery Information

Discovery Date

2002-07-09

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

0.875794

1-sigma variation

2.147E-9

Unit

Eccentricity (e)

Value

0.434595

1-sigma variation

3.124E-8

Unit

Inclination (i)

Value

5.4196

1-sigma variation

2.820E-6

Unit

Long. of Ascending Node (Ω)

Value

259.4084

1-sigma variation

9.724E-6

Unit

Arg. of Perihelion (ω)

Value

222.2058

1-sigma variation

9.918E-6

Unit

Mean Anomaly (M)

Value

328.82424

1-sigma variation

0.00001

Unit

Perihelion distance

Value

0.495179

1-sigma variation

Unit

Aphelion distance

Value

1.256410

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.031025

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.447433

1-sigma variation

Unit

MOID

Value

0.006518

1-sigma variation

Unit

Orbit Period

Value

299.3653

1-sigma variation

Unit

U parameter

Value

0.0

1-sigma variation

Unit

A₂

Value

32.52207

1-sigma variation

3.44944

Unit

10^-15au/days²

Covariance Matrix

	a	e	i	Ω	ω	M	A₂
a	4.60816E-18	-1.61593E-17	-6.29293E-16	2.33032E-16	1.76772E-15	-1.60168E-14	6.99588E-9
e	-1.61593E-17	9.76088E-16	2.07186E-14	1.22476E-14	1.09542E-14	-1.07916E-13	-3.70597E-8
i	-6.29293E-16	2.07186E-14	7.95279E-12	1.32236E-11	-1.21484E-11	-2.05907E-12	-1.26992E-6
Ω	2.33032E-16	1.22476E-14	1.32236E-11	9.45560E-11	-9.01175E-11	-8.40111E-12	-8.45137E-7
ω	1.76772E-15	1.09542E-14	-1.21484E-11	-9.01175E-11	9.83741E-11	-2.09903E-11	5.53974E-6
M	-1.60168E-14	-1.07916E-13	-2.05907E-12	-8.40111E-12	-2.09903E-11	1.14054E-10	-2.54155E-5
A₂	6.99588E-9	-3.70597E-8	-1.26992E-6	-8.45137E-7	5.53974E-6	-2.54155E-5	1.18986E1

Date of computation: 2025-09-23 13:32 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

14.5

Unit

Source

[3]

Quality

Value

Unit

Source

[3]

Amplitude

Value

0.74

Unit

mag

Source

[3]

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

[2]

Absolute Magnitude (H)
Slope Parameter (G)

H / G

Value

Unit

Source

Absolute Magnitude (H)

Value

20.032

Unit

mag

Source

[4]

Slope Parameter (G)

Value

0.15**

Unit

mag

Source

[4]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

0.0298

0.048

Unit

Source

[6]

[5]

Diameter

Value

590

Unit

Source

[5]

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]	EARN	1.) Michaël Marsset et al 2022 AJ 163 165
[2]	EARN	Earth Asteroids Research Node: https://earn.dlr.de
[3]	EARN	1.) Warner, B.D. (2017) MPB 44, 22-36. (NEAR-EARTH ASTEROID LIGHTCURVE ANALYSIS AT CS3-PALMER DIVIDE STATION: 2016 JULY-SEPTEMBER) (46 NEAs)
[4]	ESA Aegis	ESA orbit determination and impact monitoring system
[5]	EARN	1.) Joseph R. Masiero et al 2021 Planet. Sci. J. 2 162
[6]	EARN	1.) Masiero, J.R. et al. (2018) Astron. J. 154_168(10pp). (NEOWISE Reactivation Mission Year Three: Asteroid Diameters and Albedos) (170NEOs, 6110MBAs)

Observational Information

Arc Length
Unobserved
Normalized RMS of residuals

Arc Information

Value

Unit

Source

Arc Length

Value

8435

Unit

Source

[1]

Unobserved

Value

Unit

Source

[1]

Normalized RMS of residuals

Value

0.546829

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2002-07-02.446

Unit

Source

[2]

Last Observation

Value

2025-08-05.424982

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

829 (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

Close Approaches for 163348 2002NN4 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	1952-08-26 14:32	11.4	0.1943630	0.1942997	0.0000211
EARTH	1956-06-09 16:59	3.8	0.1056856	0.1056055	0.0000267
EARTH	1965-06-06 04:05	< 1 s	0.0077365	0.0077358	0.0000002
EARTH	1966-09-09 12:51	< 1 min	0.1705800	0.1705775	0.0000009
EARTH	1974-06-10 19:55	< 1 min	0.1803308	0.1803284	0.0000008
EARTH	1975-09-13 01:55	< 1 s	0.1026314	0.1026306	0.0000003
EARTH	1979-06-27 05:20	< 1 min	0.1982431	0.1982421	0.0000004
EARTH	1988-06-06 15:39	< 1 min	0.0579421	0.0579405	0.0000005
EARTH	1997-06-07 21:02	< 1 s	0.0955144	0.0955136	0.0000003
EARTH	1998-09-12 07:00	< 1 s	0.1062985	0.1062982	0.0000001
EARTH	2007-09-09 00:21	< 1 s	0.1421425	0.1421423	0.0000001
EARTH	2011-06-18 18:02	< 1 s	0.1618608	0.1618606	0.0000000
EARTH	2020-06-06 03:19	< 1 s	0.0340481	0.0340480	0.0000000
EARTH	2029-06-07 01:06	< 1 s	0.0588620	0.0588615	0.0000002
EARTH	2030-09-11 01:01	< 1 s	0.1325397	0.1325393	0.0000002
EARTH	2038-06-10 13:55	< 1 min	0.1699041	0.1699030	0.0000004
EARTH	2039-09-13 05:00	< 1 s	0.0967816	0.0967813	0.0000001
EARTH	2048-09-06 03:54	< 1 min	0.1535139	0.1535124	0.0000005
EARTH	2052-06-18 08:26	< 1 min	0.1628427	0.1628407	0.0000007
EARTH	2061-06-07 20:52	< 1 min	0.0763335	0.0763298	0.0000013
EARTH	2070-06-06 14:44	< 1 s	0.0101652	0.0101619	0.0000011
EARTH	2071-09-10 15:47	< 1 s	0.1606967	0.1606947	0.0000007
EARTH	2080-09-09 02:19	< 1 min	0.1411946	0.1411828	0.0000039
EARTH	2084-06-13 22:59	1.6	0.1393698	0.1393504	0.0000065
EARTH	2093-06-07 10:30	< 1 min	0.0707632	0.0707250	0.0000127
EARTH	2094-09-12 09:14	< 1 min	0.1158809	0.1158604	0.0000068
EARTH	2103-09-04 13:08	2.4	0.1726097	0.1725894	0.0000068
EARTH	2107-06-11 07:20	1.4	0.1027928	0.1027612	0.0000105
EARTH	2116-06-09 20:09	< 1 min	0.1272642	0.1272252	0.0000130
EARTH	2117-09-14 10:50	< 1 min	0.0961404	0.0961392	0.0000004

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
111.89826865	153.91447131	0.00651809	MINIMUM
250.61398379	249.18285644	0.09511007	MINIMUM
182.85422151	202.27436835	0.25029704	SADDLE
2.72792175	23.72684186	0.49176089	SADDLE
1.97550015	202.54189876	1.51142944	SADDLE
180.33529391	20.66325552	2.23990835	MAXIMUM

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MOID Plots

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