Asteroids

363116 2001GQ2 help

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

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Apollo

Perihelion (q)

0.604

Aphelion (Q)

1.826

Eccentricity (e)

0.503

Inclination (i)

21.8

deg

Orbit period (P)

488.9

Earth MOID

0.00627

U parameter

0.1

Next Earth close approach

Date

2065-11-03

Nominal distance (from Earth center)

0.16529

24726312

Maximum Brightness

20.4

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

20.2

mag

Diameter

240 - 500*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2001-04-14

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

1.214520

1-sigma variation

3.920E-9

Unit

Eccentricity (e)

Value

0.503065

1-sigma variation

1.872E-7

Unit

Inclination (i)

Value

21.8208

1-sigma variation

1.079E-5

Unit

Long. of Ascending Node (Ω)

Value

37.1045

1-sigma variation

2.327E-6

Unit

Arg. of Perihelion (ω)

Value

280.2964

1-sigma variation

2.240E-5

Unit

Mean Anomaly (M)

Value

87.73842

1-sigma variation

0.00002

Unit

Perihelion distance

Value

0.603537

1-sigma variation

Unit

Aphelion distance

Value

1.825502

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.160807

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.011297

1-sigma variation

Unit

MOID

Value

0.006275

1-sigma variation

Unit

Orbit Period

Value

488.8833

1-sigma variation

Unit

U parameter

Value

0.1

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	1.53639E-17	7.17258E-16	2.96697E-14	-2.38537E-15	8.55596E-14	-9.16649E-14
e	7.17258E-16	3.50289E-14	1.37023E-12	-1.07481E-13	4.16830E-12	-4.06792E-12
i	2.96697E-14	1.37023E-12	1.16486E-10	-1.32465E-11	1.72525E-10	-1.83484E-10
Ω	-2.38537E-15	-1.07481E-13	-1.32465E-11	5.41622E-12	-1.72696E-11	1.44465E-11
ω	8.55596E-14	4.16830E-12	1.72525E-10	-1.72696E-11	5.01571E-10	-4.88168E-10
M	-9.16649E-14	-4.06792E-12	-1.83484E-10	1.44465E-11	-4.88168E-10	5.78763E-10

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

[1]

Taxonomy (all)

Value

Unit

Source

[2]

Absolute Magnitude (H)
Slope Parameter (G)

H / G

Value

Unit

Source

Absolute Magnitude (H)

Value

20.196

Unit

mag

Source

[3]

Slope Parameter (G)

Value

0.15**

Unit

mag

Source

[3]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

0.05 - 0.25

Unit

Source

[4]

Diameter

Value

240 - 500*

Unit

Source

[4]

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

[5]

Download this part as:

Sources

No.	Name	Additional
[1]	EARN	1.) Alexey V. Sergeyev and Benoit Carry A&A, 652 (2021) A59
[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
[5]	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

8770

Unit

Source

[1]

Unobserved

Value

161

Unit

Source

[1]

Normalized RMS of residuals

Value

0.515468

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2001-04-14.32762

Unit

Source

[2]

Last Observation

Value

2025-04-18.225582

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

614 (9)

Unit

Source

[1]

Radar Summary

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

Radar

Value

Unit

Source

First Observation

Value

2001-04-27

Unit

Source

[3]

Last Observation

Value

2001-04-28

Unit

Source

[3]

Delay (Discarded)

Value

1 (0)

Unit

Source

[1]

Doppler (Discarded)

Value

2 (0)

Unit

Source

[1]

Total Radar Observations (Discarded)

Value

3 (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 363116 2001GQ2 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	1966-10-31 15:40	< 1 min	0.1892084	0.1892071	0.0000004
EARTH	1970-11-07 00:14	< 1 min	0.1256108	0.1256096	0.0000004
EARTH	1974-11-11 22:39	< 1 min	0.0991934	0.0991926	0.0000003
EARTH	1978-11-16 09:19	< 1 min	0.1263107	0.1263101	0.0000002
EARTH	1982-11-21 07:29	< 1 s	0.1974429	0.1974417	0.0000004
EARTH	1989-04-18 11:54	< 1 s	0.1864746	0.1864740	0.0000002
EARTH	1993-04-22 11:44	< 1 s	0.0968496	0.0968494	0.0000001
EARTH	1997-04-26 01:46	< 1 s	0.0156436	0.0156434	0.0000001
EARTH	2001-04-27 12:35	< 1 s	0.0198341	0.0198341	0.0000000
EARTH	2005-04-30 10:13	< 1 s	0.0864885	0.0864882	0.0000001
EARTH	2009-05-03 14:56	< 1 s	0.1619913	0.1619909	0.0000001
VENUS	2032-05-02 19:44	< 1 min	0.0429627	0.0429619	0.0000003
EARTH	2065-11-03 02:10	< 1 min	0.1652852	0.1652823	0.0000009
EARTH	2069-11-08 16:29	< 1 min	0.1147907	0.1147893	0.0000005
EARTH	2073-11-13 08:13	< 1 min	0.1051485	0.1051470	0.0000005
EARTH	2077-11-17 18:46	< 1 min	0.1452934	0.1452902	0.0000011
EARTH	2088-04-18 04:37	< 1 min	0.1971322	0.1971268	0.0000018
EARTH	2092-04-21 07:39	< 1 min	0.1257563	0.1257514	0.0000016
EARTH	2096-04-24 06:29	< 1 min	0.0588276	0.0588237	0.0000013
EARTH	2100-04-27 16:59	< 1 min	0.0034012	0.0033998	0.0000004
EARTH	2104-04-22 10:37	< 1 min	0.1252398	0.1252262	0.0000045
EARTH	2113-11-17 19:19	1.2	0.1311085	0.1310840	0.0000081
EARTH	2117-11-09 17:07	1.8	0.1234745	0.1234480	0.0000088

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
290.20903173	113.35921171	0.00547898	MINIMUM
62.19259141	307.79318553	0.10073149	MINIMUM
355.80089880	208.91489258	0.50512566	SADDLE
177.21392309	33.91699481	0.97706962	SADDLE
357.49323603	32.13422884	1.56335394	SADDLE
180.41277587	215.86617572	2.79309876	MAXIMUM

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MOID Plots

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