Asteroids

374158 2004UL help

Last update: 2025-10-04 13:00 UTC

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Apollo

Perihelion (q)

0.093

Aphelion (Q)

2.440

Eccentricity (e)

0.927

Inclination (i)

23.8

deg

Orbit period (P)

520.5

Earth MOID

0.01735

U parameter

0.0

Next Earth close approach

Date

2034-10-31

Nominal distance (from Earth center)

0.02659

3977552

Maximum Brightness

12.9

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

18.7

mag

Diameter

500 - 1100*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2004-10-18

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

1.266409

1-sigma variation

2.283E-9

Unit

Eccentricity (e)

Value

0.926589

1-sigma variation

3.168E-8

Unit

Inclination (i)

Value

23.8495

1-sigma variation

1.358E-5

Unit

Long. of Ascending Node (Ω)

Value

39.4636

1-sigma variation

8.995E-6

Unit

Arg. of Perihelion (ω)

Value

149.6779

1-sigma variation

9.371E-6

Unit

Mean Anomaly (M)

Value

235.68757

1-sigma variation

0.00001

Unit

Perihelion distance

Value

0.092968

1-sigma variation

Unit

Aphelion distance

Value

2.439851

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.097440

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.909271

1-sigma variation

Unit

MOID

Value

0.017352

1-sigma variation

Unit

Orbit Period

Value

520.5466

1-sigma variation

Unit

U parameter

Value

0.0

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	5.21140E-18	-7.38268E-18	-5.56469E-17	6.43758E-16	-1.54129E-15	-6.77964E-15
e	-7.38268E-18	1.00389E-15	2.66848E-14	-9.56620E-15	1.29861E-13	3.55722E-14
i	-5.56469E-17	2.66848E-14	1.84457E-10	-9.31512E-11	8.71796E-11	5.84716E-12
Ω	6.43758E-16	-9.56620E-15	-9.31512E-11	8.09033E-11	-7.35730E-11	-7.60450E-12
ω	-1.54129E-15	1.29861E-13	8.71796E-11	-7.35730E-11	8.78205E-11	8.02407E-12
M	-6.77964E-15	3.55722E-14	5.84716E-12	-7.60450E-12	8.02407E-12	3.24706E-11

Date of computation: 2025-10-04 13:00 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

Unit

Source

[3]

Quality

Value

2,T,U

Unit

Source

[3]

Amplitude

Value

1.2

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

18.77

18.677

Unit

mag

Source

[4]

[5]

Slope Parameter (G)

Value

0.15**

Unit

mag

Source

[5]

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

0.82

0.54

Unit

B-V

V-R

Source

[4]

Sightings

Sightings

Value

Unit

Source

Sightings

Value

Unit

Source

[-]

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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]	EARN	1.) Warner, B.D. (2015) MPB 42, 115-127. (NEAR-EARTH ASTEROID LIGHTCURVE ANALYSIS AT CS3-PALMER DIVIDE STATION: 2014 OCTOBER-DECEMBER)(43NEAs)
[4]	EARN	1.) Jewitt, D. (2013) Astron. J. 145_133. (properties of Near-Sun Asteroids) (3200,105140,141851,276033,2004UL, 2002PD43,2006TC,2005UD,1999YC)
[5]	ESA Aegis	ESA orbit determination and impact monitoring system
[6]	Estimation	Estimated from absolute magnitude

Observational Information

Arc Length
Unobserved
Normalized RMS of residuals

Arc Information

Value

Unit

Source

Arc Length

Value

8781

Unit

Source

[1]

Unobserved

Value

Unit

Source

[1]

Normalized RMS of residuals

Value

0.540893

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2001-09-18.424944

Unit

Source

[2]

Last Observation

Value

2025-10-03.335085

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

426 (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

Unit

Source

[-]

Last Observation

Value

Unit

Source

[-]

Delay (Discarded)

Value

0 (0)

Unit

Source

[-]

Doppler (Discarded)

Value

0 (0)

Unit

Source

[-]

Total Radar Observations (Discarded)

Value

0 (0)

Unit

Source

[-]

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

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 374158 2004UL 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	1957-11-05 17:59	< 1 s	0.1922489	0.1922479	0.0000004
EARTH	1967-11-02 15:20	< 1 min	0.0782673	0.0782658	0.0000005
EARTH	1977-10-29 07:23	< 1 min	0.0364396	0.0364381	0.0000005
EARTH	1987-10-24 21:50	< 1 min	0.1478452	0.1478436	0.0000005
EARTH	2024-11-04 16:51	< 1 s	0.1495032	0.1495028	0.0000001
EARTH	2034-10-31 19:42	< 1 s	0.0265883	0.0265878	0.0000002
EARTH	2044-10-27 11:51	< 1 min	0.0800007	0.0799999	0.0000003
EARTH	2054-10-23 10:43	< 1 min	0.1847717	0.1847707	0.0000003
EARTH	2091-11-06 19:58	< 1 min	0.1807693	0.1807672	0.0000007
EARTH	2101-11-04 02:44	< 1 min	0.0782756	0.0782732	0.0000008
EARTH	2111-10-31 23:48	< 1 min	0.0233459	0.0233438	0.0000007
EARTH	2121-10-25 21:11	< 1 s	0.1567307	0.1567302	0.0000002

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
283.62456192	296.81059618	0.01735175	MINIMUM
75.89134228	243.01837200	0.34911090	MINIMUM
2.95263293	93.52530893	0.90944473	SADDLE
3.15723164	274.54986854	1.09206521	SADDLE
178.98487934	270.24158120	1.47467431	SADDLE
180.65006734	90.55176452	3.42572671	MAXIMUM

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MOID Plots

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