Asteroids

2002AT4 help

Last update: 2026-08-19 13:30 UTC

Orbital Properties

Epoch

61200.0

MJD

Orbit type

Amor

Perihelion (q)

1.033

Aphelion (Q)

2.700

Eccentricity (e)

0.447

Inclination (i)

1.5

deg

Orbit period (P)

931.3

Earth MOID

0.04159

U parameter

0.0

Next Earth close approach

Date

2053-03-17

Nominal distance (from Earth center)

0.04702

7034042

Maximum Brightness

15.9

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

21.3

mag

Diameter

150 - 300*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2002-01-08

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

1.866348

1-sigma variation

1.125E-9

Unit

Eccentricity (e)

Value

0.446764

1-sigma variation

3.372E-8

Unit

Inclination (i)

Value

1.4981

1-sigma variation

6.263E-6

Unit

Long. of Ascending Node (Ω)

Value

323.3572

1-sigma variation

0.0001

Unit

Arg. of Perihelion (ω)

Value

203.1721

1-sigma variation

0.0001

Unit

Mean Anomaly (M)

Value

185.17086

1-sigma variation

0.00001

Unit

Perihelion distance

Value

1.032530

1-sigma variation

Unit

Aphelion distance

Value

2.700166

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

1.521996

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.071807

1-sigma variation

Unit

MOID

Value

0.041589

1-sigma variation

Unit

Orbit Period

Value

931.2952

1-sigma variation

Unit

U parameter

Value

0.0

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	1.26569E-18	-4.09406E-19	-2.34257E-16	1.17801E-15	8.93002E-15	-7.04695E-15
e	-4.09406E-19	1.13679E-15	-5.38717E-15	-3.46648E-14	1.70092E-13	-3.21822E-14
i	-2.34257E-16	-5.38717E-15	3.92233E-11	-9.77410E-11	1.02948E-10	-1.39553E-12
Ω	1.17801E-15	-3.46648E-14	-9.77410E-11	6.34294E-9	-6.26177E-9	-2.36037E-11
ω	8.93002E-15	1.70092E-13	1.02948E-10	-6.26177E-9	6.68389E-9	-1.37202E-10
M	-7.04695E-15	-3.21822E-14	-1.39553E-12	-2.36037E-11	-1.37202E-10	6.63895E-11

Date of computation: 2026-08-19 13:30 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

[1]

[2]

Taxonomy (all)

Value

Unit

Source

[3]

[2]

Absolute Magnitude (H)
Slope Parameter (G)

H / G

Value

Unit

Source

Absolute Magnitude (H)

Value

21.282

Unit

mag

Source

[4]

Slope Parameter (G)

Value

0.15**

Unit

Source

[4]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

0.05 - 0.25

Unit

Source

[5]

Diameter

Value

150 - 300*

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

Visual S

Unit

Source

[6]

Download this part as:

Sources

No.	Name	Additional
[1]	EARN	1.) Alexey V. Sergeyev and Benoit Carry A&A, 652 (2021) A59
[2]	EARN	1.) Binzel, R.P. et al. (2004) Meteorit. Planet. Sci. 39, 351-366. (Dynamical and compositional assessment of near-Earth object mission targets) (new spectra and taxonomy of 22 NEOs)
[3]	EARN	Earth Asteroids Research Node: https://earn.dlr.de
[4]	ESA Aegis	ESA orbit determination and impact monitoring system
[5]	Estimation	Estimated from absolute magnitude
[6]	EARN	1.) Binzel, R.P. et al. (2004) Meteorit. Planet. Sci. 39, 351-366. (Dynamical and compositional assessment of near-Earth object mission targets) (new spectra and taxonomy of 22 NEOs) 2.) Barucci, M.A. et al. (2018) MNRAS 476, 4481-4487. (Small D-type asteroids in the NEO population: new targets for space missions)

Observational Information

Arc Length
Unobserved
Normalized RMS of residuals

Arc Information

Value

Unit

Source

Arc Length

Value

8607

Unit

Source

[1]

Unobserved

Value

425

Unit

Source

[1]

Normalized RMS of residuals

Value

0.534948

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2001-12-18.37925

Unit

Source

[2]

Last Observation

Value

2025-07-12.186573

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

223 (12)

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

Filters

Initial Date: *

Final Date: *

Normalised Only accepted

Max residual (arcsec):

* - these fields are required

Plot

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 2002AT4 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
16 Psyche	1964-11-02 05:38	< 1 min	0.0095264	0.0095249	0.0000005
EARTH	1979-02-21 20:50	< 1 min	0.0625690	0.0625686	0.0000002
EARTH	2002-02-20 14:29	< 1 min	0.0652468	0.0652467	0.0000001
EARTH	2053-03-17 04:19	< 1 min	0.0470197	0.0470194	0.0000001
MARS	2060-07-19 07:00	< 1 min	0.0342536	0.0342520	0.0000005
EARTH	2076-03-11 12:54	< 1 min	0.0417049	0.0417045	0.0000001
EARTH	2099-03-24 15:45	5.1	0.0562756	0.0562521	0.0000078
MARS	2124-07-03 21:03	2.1	0.0483092	0.0482407	0.0000228

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
0.89109075	62.73875690	0.04158879	MINIMUM
180.65203097	242.83440612	1.69248153	SADDLE
1.69204873	244.01220029	2.04011863	SADDLE
180.61738397	62.80811708	3.69248796	MAXIMUM

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MOID Plots

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