Asteroids

363505 2003UC20 help

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

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Aten

Perihelion (q)

0.518

Aphelion (Q)

1.044

Eccentricity (e)

0.337

Inclination (i)

3.8

deg

Orbit period (P)

252.2

Earth MOID

0.03519

U parameter

0.0

A₂

-7.9

10^-15au/days²

Next Earth close approach

Date

2032-12-01

Nominal distance (from Earth center)

0.08272

12374799

Maximum Brightness

14.9

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

18.5

mag

Diameter

1900

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2003-10-21

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

0.781241

1-sigma variation

6.932E-10

Unit

Eccentricity (e)

Value

0.336920

1-sigma variation

2.924E-8

Unit

Inclination (i)

Value

3.7760

1-sigma variation

2.494E-6

Unit

Long. of Ascending Node (Ω)

Value

187.9209

1-sigma variation

2.286E-5

Unit

Arg. of Perihelion (ω)

Value

60.1713

1-sigma variation

2.244E-5

Unit

Mean Anomaly (M)

Value

117.79845

1-sigma variation

0.00001

Unit

Perihelion distance

Value

0.518025

1-sigma variation

Unit

Aphelion distance

Value

1.044457

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.406416

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.169517

1-sigma variation

Unit

MOID

Value

0.035189

1-sigma variation

Unit

Orbit Period

Value

252.2181

1-sigma variation

Unit

U parameter

Value

0.0

1-sigma variation

Unit

A₂

Value

-7.94156

1-sigma variation

0.50257

Unit

10^-15au/days²

Covariance Matrix

	a	e	i	Ω	ω	M	A₂
a	4.80497E-19	2.69783E-18	-2.08510E-17	-5.90879E-15	6.22420E-15	-3.26308E-15	2.11656E-10
e	2.69783E-18	8.55117E-16	2.12438E-14	-7.38857E-14	1.04642E-13	-1.37190E-13	7.67160E-10
i	-2.08510E-17	2.12438E-14	6.22166E-12	4.71579E-11	-4.49622E-11	-5.32046E-12	4.46594E-8
Ω	-5.90879E-15	-7.38857E-14	4.71579E-11	5.22654E-10	-5.12019E-10	2.49140E-11	-6.46230E-7
ω	6.22420E-15	1.04642E-13	-4.49622E-11	-5.12019E-10	5.03505E-10	-3.26571E-11	7.38406E-7
M	-3.26308E-15	-1.37190E-13	-5.32046E-12	2.49140E-11	-3.26571E-11	4.28924E-11	-8.57686E-7
A₂	2.11656E-10	7.67160E-10	4.46594E-8	-6.46230E-7	7.38406E-7	-8.57686E-7	2.52581E-1

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

18.487

Unit

mag

Source

[1]

Slope Parameter (G)

Value

0.15**

Unit

mag

Source

[1]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

0.03

Unit

Source

[2]

Diameter

Value

1900

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

Radar R

Unit

Source

[3]

Download this part as:

Sources

No.	Name	Additional
[1]	ESA Aegis	ESA orbit determination and impact monitoring system
[2]	EARN	1.) Nugent, C.R. et al. (2015) Astrophys. J. 814_117 (13pp) (NEOWISE Reactivation Mission Year One: Preliminary Asteroid Diameters and Albedos)(201 NEOs) 2.) Nugent, C.R. et al. (2016) Astron. J. 152_63 (12pp) (NEOWISE Reactivation Mission Year Two: Asteroid Diameters and Albedos) (207 NEOs)
[3]	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

25241

Unit

Source

[1]

Unobserved

Value

656

Unit

Source

[1]

Normalized RMS of residuals

Value

0.466969

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

1954-12-05.39861

Unit

Source

[2]

Last Observation

Value

2024-01-13.272488

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

979 (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

2003-10-28

Unit

Source

[3]

Last Observation

Value

2023-11-02

Unit

Source

[3]

Delay (Discarded)

Value

3 (0)

Unit

Source

[1]

Doppler (Discarded)

Value

5 (0)

Unit

Source

[1]

Total Radar Observations (Discarded)

Value

8 (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 363505 2003UC20 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	1954-12-18 15:49	< 1 min	0.0754696	0.0754691	0.0000002
EARTH	1956-11-01 00:31	< 1 min	0.1977112	0.1977093	0.0000006
EARTH	1964-01-01 15:24	< 1 s	0.1248277	0.1248263	0.0000005
EARTH	1965-10-31 09:31	< 1 min	0.0417608	0.0417599	0.0000003
EARTH	1974-11-25 16:37	< 1 min	0.0794851	0.0794848	0.0000001
EARTH	1983-12-29 02:21	< 1 min	0.0654981	0.0654980	0.0000000
EARTH	1985-10-31 03:55	< 1 s	0.1461212	0.1461208	0.0000001
EARTH	1992-12-31 17:59	< 1 s	0.1511088	0.1511086	0.0000001
EARTH	1994-11-02 00:37	< 1 s	0.0344172	0.0344172	0.0000000
EARTH	2003-12-01 14:30	< 1 s	0.0824363	0.0824362	0.0000000
EARTH	2012-12-29 19:26	< 1 s	0.0659326	0.0659325	0.0000000
EARTH	2014-10-31 07:43	< 1 s	0.1347494	0.1347493	0.0000000
EARTH	2022-01-01 01:24	< 1 s	0.1576978	0.1576976	0.0000001
EARTH	2023-11-02 15:48	< 1 s	0.0351109	0.0351109	0.0000000
EARTH	2032-12-01 02:05	< 1 min	0.0827204	0.0827203	0.0000000
EARTH	2041-12-30 18:50	< 1 s	0.0666789	0.0666787	0.0000001
EARTH	2043-10-31 13:12	< 1 s	0.1285385	0.1285380	0.0000002
EARTH	2051-01-01 07:54	< 1 s	0.1627414	0.1627407	0.0000002
EARTH	2052-11-02 11:56	< 1 min	0.0364246	0.0364246	0.0000000
EARTH	2061-12-04 09:05	< 1 min	0.0832350	0.0832349	0.0000000
EARTH	2071-01-01 05:58	< 1 min	0.0729451	0.0729439	0.0000004
EARTH	2072-10-30 15:38	< 1 s	0.1057715	0.1057687	0.0000009
EARTH	2079-12-31 22:52	< 1 min	0.1922948	0.1922912	0.0000012
EARTH	2081-11-07 02:16	< 1 min	0.0494334	0.0494315	0.0000006
EARTH	2090-12-19 21:14	< 1 min	0.0748960	0.0748945	0.0000005
EARTH	2092-11-01 10:56	< 1 min	0.1962927	0.1962871	0.0000019
EARTH	2100-01-02 09:53	< 1 min	0.1216613	0.1216564	0.0000017
EARTH	2101-11-01 14:48	< 1 min	0.0473621	0.0473589	0.0000011
EARTH	2110-11-22 12:03	< 1 min	0.0769116	0.0769098	0.0000006
EARTH	2119-12-29 05:41	< 1 min	0.0652355	0.0652346	0.0000003
EARTH	2121-11-01 20:12	< 1 min	0.1583425	0.1583362	0.0000021

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
140.33056364	298.12610689	0.03514128	MINIMUM
220.36168074	354.95768075	0.06469827	MINIMUM
185.70075794	330.26223471	0.08306637	SADDLE
3.17630602	149.38203949	0.49751775	SADDLE
2.76222557	328.80392418	1.50362804	SADDLE
181.23321441	147.16448650	2.05717262	MAXIMUM

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MOID Plots

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