Asteroids

204131 2003YL help

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

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Apollo

Perihelion (q)

0.421

Aphelion (Q)

1.872

Eccentricity (e)

0.632

Inclination (i)

5.7

deg

Orbit period (P)

448.4

Earth MOID

0.05144

U parameter

0.4

A₂

-38.6

10^-15au/days²

Next Earth close approach

Date

2041-12-16

Nominal distance (from Earth center)

0.12618

18875719

Maximum Brightness

18.8

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

19.9

mag

Diameter

280 - 600*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2003-12-17

Observatory

Lowell Observatory-LONEOS

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

1.146500

1-sigma variation

7.533E-9

Unit

Eccentricity (e)

Value

0.632484

1-sigma variation

4.056E-8

Unit

Inclination (i)

Value

5.6547

1-sigma variation

5.161E-6

Unit

Long. of Ascending Node (Ω)

Value

291.9165

1-sigma variation

2.583E-5

Unit

Arg. of Perihelion (ω)

Value

29.4605

1-sigma variation

2.622E-5

Unit

Mean Anomaly (M)

Value

8.47247

1-sigma variation

0.00002

Unit

Perihelion distance

Value

0.421358

1-sigma variation

Unit

Aphelion distance

Value

1.871643

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.574318

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.547642

1-sigma variation

Unit

MOID

Value

0.051437

1-sigma variation

Unit

Orbit Period

Value

448.3938

1-sigma variation

Unit

U parameter

Value

0.4

1-sigma variation

Unit

A₂

Value

-38.57683

1-sigma variation

9.23720

Unit

10^-15au/days²

Covariance Matrix

	a	e	i	Ω	ω	M	A₂
a	5.67429E-17	-1.37947E-16	-2.69987E-15	-1.34098E-14	3.45324E-14	-1.31213E-13	6.67612E-8
e	-1.37947E-16	1.64501E-15	4.15767E-14	1.18356E-13	-2.01067E-13	2.61210E-13	-1.45167E-7
i	-2.69987E-15	4.15767E-14	2.66410E-11	-1.85588E-11	1.89331E-11	4.72783E-12	-1.16283E-6
Ω	-1.34098E-14	1.18356E-13	-1.85588E-11	6.67426E-10	-6.65942E-10	1.35453E-11	-1.80771E-5
ω	3.45324E-14	-2.01067E-13	1.89331E-11	-6.65942E-10	6.87283E-10	-7.12451E-11	4.40707E-5
M	-1.31213E-13	2.61210E-13	4.72783E-12	1.35453E-11	-7.12451E-11	3.46635E-10	-1.44546E-4
A₂	6.67612E-8	-1.45167E-7	-1.16283E-6	-1.80771E-5	4.40707E-5	-1.44546E-4	8.53258E1

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

19.904

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

280 - 600*

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

8363

Unit

Source

[1]

Unobserved

Value

243

Unit

Source

[1]

Normalized RMS of residuals

Value

0.564283

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2002-03-06.3028

Unit

Source

[2]

Last Observation

Value

2025-01-27.28317

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

365 (0)

Unit

Source

[1]

Radar Summary

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

Radar

Value

Unit

Source

First Observation

Value

2014-12-05

Unit

Source

[3]

Last Observation

Value

2014-12-05

Unit

Source

[3]

Delay (Discarded)

Value

0 (0)

Unit

Source

[-]

Doppler (Discarded)

Value

1 (0)

Unit

Source

[1]

Total Radar Observations (Discarded)

Value

1 (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 204131 2003YL 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
MERCURY	1959-07-26 13:37	1.7	0.0382530	0.0382404	0.0000042
EARTH	1960-12-15 12:45	< 1 min	0.1140017	0.1139823	0.0000065
EARTH	1969-04-08 21:24	< 1 min	0.1184177	0.1184111	0.0000022
EARTH	1976-12-07 03:41	< 1 min	0.1554924	0.1554853	0.0000024
EARTH	1987-12-16 23:58	< 1 min	0.1252248	0.1252205	0.0000014
EARTH	1996-04-08 01:24	< 1 min	0.1295275	0.1295260	0.0000005
EARTH	2007-04-17 20:28	< 1 s	0.1874454	0.1874447	0.0000002
MERCURY	2011-02-06 07:47	< 1 min	0.0333127	0.0333126	0.0000000
EARTH	2014-12-14 07:34	< 1 s	0.0693027	0.0693025	0.0000001
EARTH	2023-04-07 18:59	< 1 min	0.1513757	0.1513752	0.0000002
EARTH	2041-12-16 22:51	< 1 min	0.1261764	0.1261713	0.0000017
EARTH	2050-04-11 22:10	< 1 min	0.0994752	0.0994740	0.0000004
EARTH	2057-12-10 05:33	< 1 min	0.0864736	0.0864623	0.0000038
EARTH	2077-04-17 08:38	< 1 min	0.1689116	0.1688892	0.0000075
EARTH	2084-12-15 16:56	< 1 min	0.0965882	0.0965589	0.0000098
EARTH	2093-04-11 08:15	< 1 min	0.1028117	0.1028005	0.0000037
EARTH	2100-12-10 19:29	< 1 min	0.0990655	0.0990252	0.0000134
EARTH	2120-04-16 22:41	< 1 min	0.1350046	0.1349666	0.0000127

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
77.44176279	338.37830415	0.05145240	MINIMUM
281.83364335	98.79932845	0.09879288	MINIMUM
358.78229810	217.84210480	0.59211127	SADDLE
179.94970366	38.68724313	0.88682325	SADDLE
358.56651857	37.33807459	1.40815620	SADDLE
179.51317565	218.47412776	2.88348055	MAXIMUM

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MOID Plots

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