Asteroids

612094 1999NW2 help

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

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Apollo

Perihelion (q)

0.995

Aphelion (Q)

1.237

Eccentricity (e)

0.109

Inclination (i)

8.7

deg

Orbit period (P)

430.6

Earth MOID

0.01529

U parameter

0.3

A₂

-85.1

10^-15au/days²

Next Earth close approach

Date

2032-08-28

Nominal distance (from Earth center)

0.18338

27433170

Maximum Brightness

22.6

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

23.2

mag

Diameter

60 - 130*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

1999-07-13

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

1.115996

1-sigma variation

6.162E-9

Unit

Eccentricity (e)

Value

0.108611

1-sigma variation

7.538E-8

Unit

Inclination (i)

Value

8.6802

1-sigma variation

5.466E-6

Unit

Long. of Ascending Node (Ω)

Value

289.4972

1-sigma variation

7.048E-6

Unit

Arg. of Perihelion (ω)

Value

53.0258

1-sigma variation

0.0001

Unit

Mean Anomaly (M)

Value

80.03327

1-sigma variation

0.00007

Unit

Perihelion distance

Value

0.994786

1-sigma variation

Unit

Aphelion distance

Value

1.237205

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.017200

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.196229

1-sigma variation

Unit

MOID

Value

0.015287

1-sigma variation

Unit

Orbit Period

Value

430.6181

1-sigma variation

Unit

U parameter

Value

0.3

1-sigma variation

Unit

A₂

Value

-85.06952

1-sigma variation

8.09209

Unit

10^-15au/days²

Covariance Matrix

	a	e	i	Ω	ω	M	A₂
a	3.79724E-17	-1.33896E-16	3.31547E-15	-1.96884E-15	-6.66266E-14	-5.21448E-14	4.54794E-8
e	-1.33896E-16	5.68250E-15	6.76465E-14	-1.54715E-13	4.25937E-12	-4.42968E-12	7.10981E-8
i	3.31547E-15	6.76465E-14	2.98802E-11	3.21234E-12	7.00321E-11	-9.98807E-11	5.44054E-6
Ω	-1.96884E-15	-1.54715E-13	3.21234E-12	4.96750E-11	-2.25366E-10	2.13424E-10	-1.19981E-5
ω	-6.66266E-14	4.25937E-12	7.00321E-11	-2.25366E-10	3.54830E-9	-3.72308E-9	1.04672E-4
M	-5.21448E-14	-4.42968E-12	-9.98807E-11	2.13424E-10	-3.72308E-9	4.38329E-9	-2.73504E-4
A₂	4.54794E-8	7.10981E-8	5.44054E-6	-1.19981E-5	1.04672E-4	-2.73504E-4	6.54820E1

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

23.221

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

60 - 130*

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

[-]

Download this part as:

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

7206

Unit

Source

[1]

Unobserved

Value

2402

Unit

Source

[1]

Normalized RMS of residuals

Value

0.623283

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

1999-07-13.29309

Unit

Source

[2]

Last Observation

Value

2019-04-05.340727

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

180 (6)

Unit

Source

[1]

Radar Summary

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

Radar

Value

Unit

Source

First Observation

Value

1999-07-19

Unit

Source

[3]

Last Observation

Value

1999-07-19

Unit

Source

[3]

Delay (Discarded)

Value

0 (0)

Unit

Source

[-]

Doppler (Discarded)

Value

2 (0)

Unit

Source

[1]

Total Radar Observations (Discarded)

Value

2 (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

Close Approaches for 612094 1999NW2 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	1954-07-07 01:01	< 1 min	0.1253695	0.1253610	0.0000028
EARTH	1954-12-23 01:04	1.3	0.1826525	0.1826504	0.0000007
EARTH	1967-07-23 22:54	< 1 min	0.0831454	0.0831349	0.0000035
EARTH	1967-11-07 13:02	< 1 min	0.1567028	0.1567023	0.0000002
EARTH	1986-07-13 09:29	< 1 min	0.0291803	0.0291784	0.0000007
EARTH	1986-12-07 10:24	< 1 min	0.1590036	0.1590033	0.0000001
EARTH	1999-07-15 06:42	< 1 s	0.0163077	0.0163076	0.0000000
EARTH	1999-12-05 03:57	< 1 min	0.1536718	0.1536716	0.0000001
EARTH	2012-07-08 23:38	< 1 min	0.0853425	0.0853410	0.0000005
EARTH	2012-12-19 11:34	< 1 min	0.1695127	0.1695124	0.0000001
EARTH	2032-08-28 23:20	< 1 min	0.1833794	0.1833771	0.0000008
EARTH	2032-10-22 22:26	< 1 min	0.1843931	0.1843915	0.0000005
EARTH	2045-07-18 16:17	< 1 min	0.0490124	0.0490079	0.0000015
EARTH	2045-11-24 11:09	< 1 min	0.1498027	0.1498024	0.0000001
EARTH	2058-07-20 08:59	< 1 min	0.0633295	0.0633267	0.0000009
EARTH	2058-11-20 09:21	< 1 min	0.1502784	0.1502781	0.0000001
EARTH	2071-10-21 07:57	< 1 min	0.1944961	0.1944930	0.0000010
EARTH	2090-07-09 00:55	< 1 min	0.0926915	0.0926892	0.0000007
EARTH	2090-12-20 08:45	< 1 min	0.1731021	0.1731016	0.0000002
EARTH	2103-07-15 20:21	< 1 min	0.0179222	0.0179212	0.0000003
EARTH	2103-12-08 08:25	1.2	0.1521034	0.1521032	0.0000001
EARTH	2116-07-09 02:55	2.9	0.1013913	0.1012663	0.0000417
EARTH	2116-12-24 14:42	21.8	0.1741623	0.1741262	0.0000120

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
314.49936392	190.24960858	0.01690519	MINIMUM
73.06869523	320.27128344	0.14887689	MINIMUM
40.67313162	286.14688146	0.15407556	SADDLE
192.80051312	70.75870523	0.28368037	SADDLE
355.89772173	56.12361858	1.98267009	SADDLE
171.76749896	231.92878779	2.24300677	MAXIMUM

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MOID Plots

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