Asteroids

439437 2013NK4 help

Last update: 2026-03-17 23:26 UTC

Orbital Properties

Epoch

61200.0

MJD

Orbit type

Apollo

Perihelion (q)

0.460

Aphelion (Q)

1.585

Eccentricity (e)

0.550

Inclination (i)

6.5

deg

Orbit period (P)

377.7

Earth MOID

0.01507

U parameter

0.0

Next Earth close approach

Date

2043-08-10

Nominal distance (from Earth center)

0.18617

27850522

Maximum Brightness

18.8

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

mag

Diameter

400 - 900*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2013-07-01

Observatory

Siding Spring Survey

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

1.022652

1-sigma variation

2.381E-9

Unit

Eccentricity (e)

Value

0.549909

1-sigma variation

2.689E-8

Unit

Inclination (i)

Value

6.5474

1-sigma variation

3.963E-6

Unit

Long. of Ascending Node (Ω)

Value

33.6926

1-sigma variation

5.318E-6

Unit

Arg. of Perihelion (ω)

Value

50.6014

1-sigma variation

5.704E-6

Unit

Mean Anomaly (M)

Value

84.79571

1-sigma variation

4.107E-6

Unit

Perihelion distance

Value

0.460286

1-sigma variation

Unit

Aphelion distance

Value

1.585018

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.465515

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.090106

1-sigma variation

Unit

MOID

Value

0.015066

1-sigma variation

Unit

Orbit Period

Value

377.7376

1-sigma variation

Unit

U parameter

Value

0.0

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	5.66928E-18	3.66418E-17	-2.30032E-15	1.92318E-15	-3.78632E-15	-9.22709E-15
e	3.66418E-17	7.22974E-16	-4.77818E-14	8.57307E-15	-4.89725E-14	-8.93545E-14
i	-2.30032E-15	-4.77818E-14	1.57083E-11	-1.38256E-11	1.59072E-11	6.04217E-12
Ω	1.92318E-15	8.57307E-15	-1.38256E-11	2.82829E-11	-2.91962E-11	-3.72823E-12
ω	-3.78632E-15	-4.89725E-14	1.59072E-11	-2.91962E-11	3.25303E-11	8.52105E-12
M	-9.22709E-15	-8.93545E-14	6.04217E-12	-3.72823E-12	8.52105E-12	1.68645E-11

Date of computation: 2026-03-17 23:26 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

[1]

Taxonomy (all)

Value

Unit

Source

[2]

Absolute Magnitude (H)
Slope Parameter (G)

H / G

Value

Unit

Source

Absolute Magnitude (H)

Value

18.999

Unit

mag

Source

[3]

Slope Parameter (G)

Value

0.15**

Unit

Source

[3]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

0.05 - 0.25

Unit

Source

[4]

Diameter

Value

400 - 900*

Unit

Source

[4]

Color Index Information

Color Index Information

Value

Unit

Source

Color Index Information

Value

0.4672

0.5093

-0.042

Unit

g-i

g-r

r-i

Source

[1]

Sightings

Sightings

Value

Unit

Source

Sightings

Value

Unit

Source

[-]

Download this part as:

Sources

No.	Name	Additional
[1]	EARN	1.) A. V. Sergeyev, B. Carry et al A&A, 658 (2022) A109
[2]	EARN	Earth Asteroids Research Node: https://earn.dlr.de
[3]	ESA Aegis	ESA orbit determination and impact monitoring system
[4]	Estimation	Estimated from absolute magnitude

Observational Information

Arc Length
Unobserved
Normalized RMS of residuals

Arc Information

Value

Unit

Source

Arc Length

Value

4350

Unit

Source

[1]

Unobserved

Value

326

Unit

Source

[1]

Normalized RMS of residuals

Value

0.527469

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2013-07-01.78755

Unit

Source

[2]

Last Observation

Value

2025-05-29.928677

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

627 (7)

Unit

Source

[1]

Radar Summary

First Observation
Last Observation
Delay (Discarded)
Doppler (Discarded)
Total Optical Observations (Discarded)

Radar

Value

Unit

Source

First Observation

Value

2024-04-13

Unit

Source

[3]

Last Observation

Value

2024-04-19

Unit

Source

[3]

Delay (Discarded)

Value

4 (0)

Unit

Source

[1]

Doppler (Discarded)

Value

1 (0)

Unit

Source

[1]

Total Radar Observations (Discarded)

Value

5 (0)

Unit

Source

[1]

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
[3]	JPL Radar Observations	Jet Propulsion Laboratory: https://ssd.jpl.nasa.gov/dat/radar_data_ast.txt

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 439437 2013NK4 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	1956-08-13 16:25	< 1 s	0.1174012	0.1174008	0.0000001
VENUS	1963-01-30 13:42	< 1 s	0.0344341	0.0344337	0.0000001
EARTH	1966-04-13 12:06	< 1 s	0.1380865	0.1380860	0.0000002
EARTH	1967-04-19 08:08	< 1 s	0.0842048	0.0842041	0.0000002
EARTH	1984-08-11 18:57	< 1 min	0.1446899	0.1446891	0.0000003
EARTH	1985-08-19 16:22	< 1 s	0.1663933	0.1663923	0.0000003
EARTH	1994-04-13 19:56	< 1 s	0.1644048	0.1644042	0.0000002
EARTH	1995-04-18 11:31	< 1 s	0.0573528	0.0573523	0.0000002
VENUS	1999-05-16 21:23	< 1 s	0.0138343	0.0138340	0.0000001
VENUS	2006-06-11 04:31	< 1 min	0.0293207	0.0293198	0.0000003
EARTH	2013-08-13 20:07	< 1 s	0.1217271	0.1217268	0.0000001
EARTH	2014-08-20 09:06	< 1 s	0.1886316	0.1886313	0.0000001
EARTH	2024-04-15 14:49	< 1 s	0.0217694	0.0217694	0.0000000
EARTH	2025-04-23 11:11	< 1 s	0.1892677	0.1892677	0.0000000
VENUS	2029-03-16 08:45	< 1 s	0.0236074	0.0236068	0.0000002
EARTH	2043-08-10 09:08	< 1 s	0.1861692	0.1861689	0.0000001
EARTH	2044-08-17 11:42	< 1 s	0.1187278	0.1187274	0.0000001
VENUS	2047-12-24 23:51	< 1 min	0.0478192	0.0478179	0.0000004
EARTH	2054-04-15 04:07	< 1 s	0.1972111	0.1972103	0.0000002
EARTH	2055-04-17 05:54	< 1 s	0.0143900	0.0143899	0.0000000
EARTH	2074-08-12 21:55	< 1 min	0.1439639	0.1439583	0.0000019
EARTH	2075-08-20 09:16	< 1 min	0.1543163	0.1543100	0.0000021
VENUS	2080-11-18 22:02	< 1 min	0.0138449	0.0138389	0.0000020
EARTH	2085-04-14 05:57	< 1 min	0.1454572	0.1454382	0.0000063
EARTH	2086-04-18 20:45	< 1 min	0.0519673	0.0519465	0.0000069
VENUS	2099-08-28 01:24	< 1 min	0.0290446	0.0290134	0.0000104
EARTH	2105-08-13 15:41	< 1 min	0.1493181	0.1493126	0.0000018
EARTH	2106-08-21 06:59	< 1 min	0.1489374	0.1489283	0.0000030
EARTH	2116-04-15 04:20	< 1 min	0.1265361	0.1264784	0.0000192
EARTH	2117-04-20 17:19	1.1	0.0769238	0.0768623	0.0000205

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
88.45584102	104.13413316	0.01484745	MINIMUM
272.19146026	222.25916036	0.10945905	MINIMUM
0.13587025	343.65036945	0.52734704	SADDLE
180.71156592	162.99617070	0.57874711	SADDLE
359.37370063	162.30396350	1.47643297	SADDLE
179.50210624	342.34303914	2.56709322	MAXIMUM

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MOID Plots

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