Asteroids

163249 2002GT help

Last update: 2025-10-25 16:00 UTC

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Apollo

Perihelion (q)

0.894

Aphelion (Q)

1.794

Eccentricity (e)

0.335

Inclination (i)

7.0

deg

Orbit period (P)

569.3

Earth MOID

0.01588

U parameter

0.0

Next Earth close approach

Date

2027-08-16

Nominal distance (from Earth center)

0.14956

22374288

Maximum Brightness

20.5

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

18.6

mag

Diameter

500 - 1100*

Taxonomic type

Rotation period (T)

3.766

Discovery Information

Discovery Date

2002-04-03

Observatory

LPL/Spacewatch II

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

1.344305

1-sigma variation

1.301E-9

Unit

Eccentricity (e)

Value

0.334796

1-sigma variation

1.738E-8

Unit

Inclination (i)

Value

6.9698

1-sigma variation

9.152E-7

Unit

Long. of Ascending Node (Ω)

Value

201.7189

1-sigma variation

1.728E-5

Unit

Arg. of Perihelion (ω)

Value

135.1294

1-sigma variation

1.589E-5

Unit

Mean Anomaly (M)

Value

312.87664

1-sigma variation

4.708E-6

Unit

Perihelion distance

Value

0.894237

1-sigma variation

Unit

Aphelion distance

Value

1.794372

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.561134

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.032669

1-sigma variation

Unit

MOID

Value

0.015880

1-sigma variation

Unit

Orbit Period

Value

569.3049

1-sigma variation

Unit

U parameter

Value

0.0

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	1.69157E-18	3.80337E-18	2.39090E-16	4.51769E-15	-3.80367E-15	-5.86994E-15
e	3.80337E-18	3.02129E-16	5.44949E-15	8.66503E-15	2.81900E-14	-1.59886E-14
i	2.39090E-16	5.44949E-15	8.37563E-13	1.41758E-11	-1.25051E-11	-1.34434E-12
Ω	4.51769E-15	8.66503E-15	1.41758E-11	2.98670E-10	-2.71728E-10	-3.05617E-11
ω	-3.80367E-15	2.81900E-14	-1.25051E-11	-2.71728E-10	2.52341E-10	2.59979E-11
M	-5.86994E-15	-1.59886E-14	-1.34434E-12	-3.05617E-11	2.59979E-11	2.21637E-11

Date of computation: 2025-10-25 16:00 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

3.766

Unit

Source

[3]

Quality

Value

3,B

Unit

Source

[3]

Amplitude

Value

0.36

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

18.572

18.71

Unit

mag

Source

[4]

[5]

Slope Parameter (G)

Value

0.15**

Unit

mag

Source

[4]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

0.05 - 0.25

Unit

Source

[6]

Diameter

Value

500 - 1100*

Unit

Source

[6]

Color Index Information

Color Index Information

Value

Unit

Source

Color Index Information

Value

0.303

0.924

0.49

Unit

R-I

B-V

V-R

Source

[7]

Sightings

Sightings

Value

Unit

Source

Sightings

Value

Radar R

Visual S

Unit

Source

[8]

[9]

Download this part as:

Sources

No.	Name	Additional
[1]	EARN	1.) Hicks, M. et al. (2013) href="http://www.astronomerstelegram.org/?read=5132"> ATel#5132 (Palomar Spectroscopy of Near-Earth Asteroids 137199 (1999 KX4), 152756 (1999 JV3), 163249 (2002 GT), 163364 (2002 OD20), and 285263 (1998 QE2))
[2]	EARN	1.) Hicks, M. et al. (2013) href="http://www.astronomerstelegram.org/?read=5132"> ATel#5132 (Palomar Spectroscopy of Near-Earth Asteroids 137199 (1999 KX4), 152756 (1999 JV3), 163249 (2002 GT), 163364 (2002 OD20), and 285263 (1998 QE2)) 2.) Pittichova, J. et al. (2013) DPS 45, 101-06. (abstract) (Physical Characterization of Deep Impact Flyby Target (163249) 2002 GT)
[3]	EARN	1.) Pittichova, J. et al. (2013) DPS 45, 101-06. (abstract) (Physical Characterization of Deep Impact Flyby Target (163249) 2002 GT) 2.) Franco, L. et al. (2013) MPB 40, 205. (LIGHTCURVE OF THE POTENTIALLY HAZARDOUS ASTEROID (163249) 2002 GT) 3.) Bacci, P. et al. (2013) priv.comm. href="http://backman.altervista.org/Aimg/2002GT_LC.png"> Phased plot of 163249 2002 GT
[4]	ESA Aegis	ESA orbit determination and impact monitoring system
[5]	EARN	1.) Pittichova, J. et al. (2013) DPS 45, 101-06. (abstract) (Physical Characterization of Deep Impact Flyby Target (163249) 2002 GT)
[6]	Estimation	Estimated from absolute magnitude
[7]	EARN	1.) Lin, C-H. et al. (2018) P&SS 152, 116-135. (Photometric survey and taxonomic identifications of 92 near-Earth asteroids)
[8]	EARN	1.) href="http://echo.jpl.nasa.gov/asteroids/index.html">JPL's NEO Radar Detection Program Webpage
[9]	EARN	1.) Hicks, M. et al. (2013) href="http://www.astronomerstelegram.org/?read=5132"> ATel#5132 (Palomar Spectroscopy of Near-Earth Asteroids 137199 (1999 KX4), 152756 (1999 JV3), 163249 (2002 GT), 163364 (2002 OD20), and 285263 (1998 QE2)) 2.) Lim, L.F. et al. (2014) LPSC 45, 1695. (Thermal Emission Photometry of Three Near-Earth Asteroids in L' and M')(163249,277475,137126)

Observational Information

Arc Length
Unobserved
Normalized RMS of residuals

Arc Information

Value

Unit

Source

Arc Length

Value

8367

Unit

Source

[1]

Unobserved

Value

267

Unit

Source

[1]

Normalized RMS of residuals

Value

0.433071

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2002-04-03.36152

Unit

Source

[2]

Last Observation

Value

2025-02-28.273256

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

1621 (5)

Unit

Source

[1]

Radar Summary

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

Radar

Value

Unit

Source

First Observation

Value

2013-06-01

Unit

Source

[3]

Last Observation

Value

2013-06-13

Unit

Source

[3]

Delay (Discarded)

Value

5 (0)

Unit

Source

[1]

Doppler (Discarded)

Value

0 (0)

Unit

Source

[-]

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

Close Approaches for 163249 2002GT 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	1960-06-17 03:15	< 1 min	0.1650528	0.1650519	0.0000003
EARTH	1963-11-06 02:13	< 1 min	0.1900187	0.1900175	0.0000004
EARTH	1974-08-04 09:31	< 1 min	0.1484154	0.1484153	0.0000000
EARTH	1988-10-14 13:53	< 1 min	0.0459329	0.0459325	0.0000001
EARTH	2002-10-30 23:49	< 1 s	0.0977486	0.0977482	0.0000001
EARTH	2013-06-26 13:05	< 1 s	0.1201943	0.1201943	0.0000000
EARTH	2027-08-16 21:22	< 1 min	0.1495629	0.1495628	0.0000000
EARTH	2041-10-07 20:55	< 1 min	0.0745802	0.0745796	0.0000002
EARTH	2055-10-25 20:04	< 1 min	0.0336004	0.0336001	0.0000001
EARTH	2066-06-30 02:37	< 1 min	0.1203362	0.1203361	0.0000000
EARTH	2080-09-23 09:02	< 1 min	0.1108857	0.1108839	0.0000006
EARTH	2094-11-02 15:00	< 1 min	0.1258856	0.1258816	0.0000013
EARTH	2105-07-25 22:39	< 1 min	0.1421817	0.1421810	0.0000002
EARTH	2119-10-17 05:19	< 1 min	0.0452416	0.0452406	0.0000003

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
37.68483072	288.04406764	0.01587968	MINIMUM
314.85463983	174.35014198	0.11982489	MINIMUM
348.03851595	219.54547132	0.15048649	SADDLE
177.31970891	53.41720753	0.81199417	SADDLE
356.93328280	52.27692058	1.88296131	SADDLE
179.14829350	234.69246722	2.80260270	MAXIMUM

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MOID Plots

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