Asteroids

480883 2001YE4 help

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

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Aten

Perihelion (q)

0.311

Aphelion (Q)

1.043

Eccentricity (e)

0.540

Inclination (i)

4.9

deg

Orbit period (P)

203.4

Earth MOID

0.03120

U parameter

0.0

A₂

-69.1

10^-15au/days²

Next Earth close approach

Date

2026-12-01

Nominal distance (from Earth center)

0.07148

10693016

Maximum Brightness

17.8

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

20.9

mag

Diameter

180 - 400*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2001-12-21

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

0.676870

1-sigma variation

5.818E-10

Unit

Eccentricity (e)

Value

0.540429

1-sigma variation

2.323E-8

Unit

Inclination (i)

Value

4.8531

1-sigma variation

4.113E-6

Unit

Long. of Ascending Node (Ω)

Value

305.3186

1-sigma variation

3.473E-5

Unit

Arg. of Perihelion (ω)

Value

318.9944

1-sigma variation

3.245E-5

Unit

Mean Anomaly (M)

Value

193.15680

1-sigma variation

0.00001

Unit

Perihelion distance

Value

0.311070

1-sigma variation

Unit

Aphelion distance

Value

1.042671

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.676203

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.176026

1-sigma variation

Unit

MOID

Value

0.031197

1-sigma variation

Unit

Orbit Period

Value

203.4026

1-sigma variation

Unit

U parameter

Value

0.0

1-sigma variation

Unit

A₂

Value

-69.14004

1-sigma variation

0.73119

Unit

10^-15au/days²

Covariance Matrix

	a	e	i	Ω	ω	M	A₂
a	3.38485E-19	-2.88703E-19	-6.32931E-16	5.21005E-15	-4.87065E-15	-3.46382E-15	4.24498E-10
e	-2.88703E-19	5.39583E-16	1.93538E-14	-2.17654E-13	1.85082E-13	1.27138E-13	-1.34773E-9
i	-6.32931E-16	1.93538E-14	1.69161E-11	-1.36969E-10	1.28521E-10	2.66851E-11	-8.73728E-7
Ω	5.21005E-15	-2.17654E-13	-1.36969E-10	1.20606E-9	-1.12628E-9	-2.42273E-10	7.39417E-6
ω	-4.87065E-15	1.85082E-13	1.28521E-10	-1.12628E-9	1.05300E-9	2.21927E-10	-6.87206E-6
M	-3.46382E-15	1.27138E-13	2.66851E-11	-2.42273E-10	2.21927E-10	8.55859E-11	-4.65181E-6
A₂	4.24498E-10	-1.34773E-9	-8.73728E-7	7.39417E-6	-6.87206E-6	-4.65181E-6	5.34641E-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

20.858

Unit

mag

Source

[1]

Slope Parameter (G)

Value

0.15**

Unit

mag

Source

[1]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

0.05 - 0.25

Unit

Source

[2]

Diameter

Value

180 - 400*

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]	Estimation	Estimated from absolute magnitude
[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

7336

Unit

Source

[1]

Unobserved

Value

1369

Unit

Source

[1]

Normalized RMS of residuals

Value

0.472123

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2001-12-21.44147

Unit

Source

[2]

Last Observation

Value

2022-01-21.265656

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

433 (1)

Unit

Source

[1]

Radar Summary

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

Radar

Value

Unit

Source

First Observation

Value

2002-01-10

Unit

Source

[3]

Last Observation

Value

2016-12-29

Unit

Source

[3]

Delay (Discarded)

Value

6 (0)

Unit

Source

[1]

Doppler (Discarded)

Value

1 (0)

Unit

Source

[1]

Total Radar Observations (Discarded)

Value

7 (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 480883 2001YE4 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
VENUS	1952-07-20 12:28	< 1 min	0.0452003	0.0451998	0.0000002
EARTH	1953-01-02 07:57	< 1 min	0.0381802	0.0381780	0.0000007
EARTH	1957-12-28 16:47	< 1 min	0.0589873	0.0589852	0.0000007
EARTH	1962-12-21 20:51	< 1 min	0.0764938	0.0764930	0.0000003
VENUS	1964-03-28 19:06	< 1 min	0.0457383	0.0457381	0.0000001
EARTH	1967-12-14 01:10	< 1 min	0.0824556	0.0824555	0.0000000
EARTH	1972-12-05 17:52	< 1 min	0.0776694	0.0776691	0.0000001
VENUS	1975-12-06 06:11	< 1 s	0.0478307	0.0478302	0.0000001
EARTH	1977-11-30 03:40	< 1 min	0.0709609	0.0709608	0.0000000
EARTH	1982-11-27 02:15	< 1 s	0.0804839	0.0804836	0.0000001
EARTH	1987-01-05 06:30	< 1 s	0.1959729	0.1959722	0.0000002
EARTH	1987-11-26 06:32	< 1 s	0.1155269	0.1155264	0.0000002
EARTH	1992-01-06 23:29	< 1 s	0.1309613	0.1309608	0.0000002
EARTH	1992-11-26 02:50	< 1 s	0.1700510	0.1700506	0.0000001
EARTH	1997-01-06 13:22	< 1 s	0.0728149	0.0728147	0.0000001
EARTH	2002-01-05 08:18	< 1 s	0.0337513	0.0337512	0.0000000
EARTH	2007-01-02 01:54	< 1 s	0.0418298	0.0418298	0.0000000
EARTH	2011-12-26 17:08	< 1 s	0.0668444	0.0668443	0.0000000
EARTH	2016-12-16 19:10	< 1 s	0.0812620	0.0812620	0.0000000
EARTH	2021-12-08 04:22	< 1 s	0.0794254	0.0794253	0.0000000
EARTH	2026-12-01 04:48	< 1 s	0.0714784	0.0714783	0.0000000
EARTH	2031-11-27 17:25	< 1 s	0.0803393	0.0803392	0.0000000
EARTH	2036-01-05 19:06	< 1 s	0.1950088	0.1950084	0.0000001
EARTH	2036-11-25 20:08	< 1 s	0.1171149	0.1171146	0.0000001
EARTH	2041-01-06 11:18	< 1 s	0.1309162	0.1309156	0.0000002
EARTH	2041-11-26 16:21	< 1 s	0.1700396	0.1700390	0.0000002
EARTH	2046-01-07 01:50	< 1 s	0.0753336	0.0753328	0.0000003
EARTH	2051-01-06 04:45	< 1 min	0.0360551	0.0360546	0.0000002
VENUS	2052-03-18 22:30	< 1 s	0.0487704	0.0487702	0.0000000
EARTH	2056-01-03 23:16	< 1 min	0.0340937	0.0340931	0.0000002
EARTH	2060-12-29 10:28	< 1 min	0.0557293	0.0557280	0.0000004
VENUS	2063-11-26 03:19	< 1 min	0.0493039	0.0493035	0.0000001
EARTH	2065-12-22 16:08	< 1 min	0.0744262	0.0744251	0.0000004
EARTH	2070-12-14 21:14	< 1 min	0.0815148	0.0815147	0.0000000
EARTH	2075-12-07 09:36	< 1 min	0.0773716	0.0773706	0.0000003
EARTH	2080-11-30 17:16	< 1 min	0.0712521	0.0712518	0.0000001
EARTH	2085-11-27 14:12	< 1 min	0.0807730	0.0807675	0.0000018
EARTH	2090-01-05 13:07	< 1 min	0.1956157	0.1955969	0.0000062
EARTH	2090-11-26 16:40	< 1 min	0.1166554	0.1166410	0.0000048
EARTH	2095-01-07 05:12	< 1 min	0.1328120	0.1327894	0.0000075
EARTH	2095-11-27 11:38	< 1 min	0.1688997	0.1688786	0.0000071
EARTH	2100-01-07 20:04	< 1 min	0.0737516	0.0737292	0.0000075
EARTH	2105-01-06 16:42	< 1 min	0.0321002	0.0320910	0.0000031
EARTH	2110-01-03 20:34	1.2	0.0370109	0.0369980	0.0000043
EARTH	2114-12-28 14:54	2.2	0.0636118	0.0635986	0.0000044
EARTH	2119-12-20 07:31	2.6	0.0793184	0.0793138	0.0000015
EARTH	2124-12-10 07:30	2.3	0.0795213	0.0795179	0.0000011

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
214.97090755	1.64460172	0.03124442	MINIMUM
150.01348042	326.04762253	0.07124865	MINIMUM
175.04874310	339.78193586	0.08203489	SADDLE
0.94007320	163.00557036	0.70514444	SADDLE
1.08564060	343.31470889	1.29508755	SADDLE
180.57653007	162.76516761	2.05744449	MAXIMUM

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MOID Plots

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