Asteroids

179806 2002TD66 help

Last update: 2026-07-30 09:40 UTC

Orbital Properties

Epoch

61200.0

MJD

Orbit type

Apollo

Perihelion (q)

0.864

Aphelion (Q)

2.851

Eccentricity (e)

0.535

Inclination (i)

4.9

deg

Orbit period (P)

924.8

Earth MOID

0.00537

U parameter

0.5

Next Earth close approach

Date

2040-11-13

Nominal distance (from Earth center)

0.08271

12372997

Maximum Brightness

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

20.4

mag

Diameter

220 - 500*

Taxonomic type

Rotation period (T)

9.456

Discovery Information

Discovery Date

2002-10-05

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

1.857727

1-sigma variation

2.298E-8

Unit

Eccentricity (e)

Value

0.534791

1-sigma variation

4.474E-8

Unit

Inclination (i)

Value

4.9268

1-sigma variation

9.641E-6

Unit

Long. of Ascending Node (Ω)

Value

335.5189

1-sigma variation

1.774E-5

Unit

Arg. of Perihelion (ω)

Value

125.9077

1-sigma variation

2.108E-5

Unit

Mean Anomaly (M)

Value

94.01836

1-sigma variation

0.00004

Unit

Perihelion distance

Value

0.864232

1-sigma variation

Unit

Aphelion distance

Value

2.851222

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.922266

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.020129

1-sigma variation

Unit

MOID

Value

0.005374

1-sigma variation

Unit

Orbit Period

Value

924.8498

1-sigma variation

Unit

U parameter

Value

0.5

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	5.27996E-16	8.84031E-16	-7.94845E-14	-4.84393E-14	-1.93539E-13	-8.64185E-13
e	8.84031E-16	2.00149E-15	-1.13386E-13	-7.58525E-14	-4.82607E-13	-1.42194E-12
i	-7.94845E-14	-1.13386E-13	9.29412E-11	5.90411E-11	-3.07230E-11	1.32228E-10
Ω	-4.84393E-14	-7.58525E-14	5.90411E-11	3.14632E-10	-2.89430E-10	7.91790E-11
ω	-1.93539E-13	-4.82607E-13	-3.07230E-11	-2.89430E-10	4.44305E-10	3.02664E-10
M	-8.64185E-13	-1.42194E-12	1.32228E-10	7.91790E-11	3.02664E-10	1.41761E-9

Date of computation: 2026-07-30 09:40 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

9.456

Unit

Source

[1]

Quality

Value

Unit

Source

[1]

Amplitude

Value

1.16

Unit

mag

Source

[1]

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

20.38

Unit

mag

Source

[2]

Slope Parameter (G)

Value

0.15**

Unit

Source

[2]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

0.05 - 0.25

Unit

Source

[3]

Diameter

Value

220 - 500*

Unit

Source

[3]

Color Index Information

Color Index Information

Value

Unit

Source

Color Index Information

Value

Unit

mag

Source

[-]

Sightings

Sightings

Value

Unit

Source

Sightings

Value

Radar R

Unit

Source

[4]

Download this part as:

Sources

No.	Name	Additional
[1]	EARN	1.) Warner, B.D. (2008) MPB 35, 163-167. (ASTEROID LIGHTCURVE ANALYSIS AT THE PALMER DIVIDE OBSERVATORY: FEBRUARY - MAY 2008) (..,179806 2002TD66,..)
[2]	ESA Aegis	ESA orbit determination and impact monitoring system
[3]	Estimation	Estimated from absolute magnitude
[4]	EARN	1.) href="http://echo.jpl.nasa.gov/asteroids/index.html">JPL's NEO Radar Detection Program Webpage

Observational Information

Arc Length
Unobserved
Normalized RMS of residuals

Arc Information

Value

Unit

Source

Arc Length

Value

2017

Unit

Source

[1]

Unobserved

Value

6691

Unit

Source

[1]

Normalized RMS of residuals

Value

0.511087

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2002-10-05.25042

Unit

Source

[2]

Last Observation

Value

2008-04-13.16903

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

307 (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

2008-02-23

Unit

Source

[3]

Last Observation

Value

2008-02-23

Unit

Source

[3]

Delay (Discarded)

Value

1 (0)

Unit

Source

[1]

Doppler (Discarded)

Value

1 (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

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 179806 2002TD66 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	1954-11-09 13:10	< 1 min	0.0829188	0.0829165	0.0000008
EARTH	1960-01-25 10:40	1.8	0.1106546	0.1106479	0.0000022
EARTH	1997-10-30 07:13	< 1 min	0.1679426	0.1679407	0.0000006
EARTH	2002-12-21 14:44	< 1 min	0.1351343	0.1351340	0.0000001
EARTH	2008-02-26 04:04	< 1 s	0.0428223	0.0428222	0.0000000
EARTH	2040-11-13 06:50	< 1 min	0.0827084	0.0827079	0.0000001
EARTH	2046-02-11 09:24	1.3	0.0575252	0.0575131	0.0000040
EARTH	2083-11-17 23:35	1.4	0.0865630	0.0865583	0.0000016
EARTH	2089-02-12 00:39	2.5	0.0550753	0.0550509	0.0000081

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
29.17528800	46.93479347	0.00537392	MINIMUM
330.53796344	306.68377830	0.08236372	MINIMUM
357.24262768	352.25706830	0.13647162	SADDLE
179.79581645	176.99271602	1.83823194	SADDLE
359.72596950	176.68993392	1.87991365	SADDLE
180.05576145	357.13739467	3.83297659	MAXIMUM

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MOID Plots

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