Asteroids

2004FH help

Last update: 2026-03-17 23:26 UTC

Orbital Properties

Epoch

61200.0

MJD

Orbit type

Aten

Perihelion (q)

0.583

Aphelion (Q)

1.056

Eccentricity (e)

0.289

Inclination (i)

0.1

deg

Orbit period (P)

270.8

Earth MOID

0.00050

U parameter

0.4

Next Earth close approach

Date

2038-01-10

Nominal distance (from Earth center)

0.14685

21968435

Maximum Brightness

25.5

mag

Risk

Object is in risk list

Physical Properties

Absolute Magnitude (H)

26.1

mag

Diameter

16 - 40*

Taxonomic type

Rotation period (T)

0.05040

Discovery Information

Discovery Date

2004-03-16

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

61200.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

0.819251

1-sigma variation

4.241E-9

Unit

Eccentricity (e)

Value

0.288878

1-sigma variation

3.341E-8

Unit

Inclination (i)

Value

0.0549

1-sigma variation

4.509E-7

Unit

Long. of Ascending Node (Ω)

Value

258.1388

1-sigma variation

0.0024

Unit

Arg. of Perihelion (ω)

Value

69.2499

1-sigma variation

0.0024

Unit

Mean Anomaly (M)

Value

239.56177

1-sigma variation

0.00001

Unit

Perihelion distance

Value

0.582588

1-sigma variation

Unit

Aphelion distance

Value

1.055915

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.344006

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.133197

1-sigma variation

Unit

MOID

Value

0.000497

1-sigma variation

Unit

Orbit Period

Value

270.8471

1-sigma variation

Unit

U parameter

Value

0.4

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	1.79837E-17	7.83320E-17	8.07564E-16	-8.23918E-12	8.22988E-12	-5.16687E-14
e	7.83320E-17	1.11591E-15	-7.79160E-15	-1.02894E-12	9.25678E-13	-1.97922E-13
i	8.07564E-16	-7.79160E-15	2.03301E-13	-8.87767E-10	8.88259E-10	-2.73106E-12
Ω	-8.23918E-12	-1.02894E-12	-8.87767E-10	5.58636E-6	-5.58476E-6	2.52779E-8
ω	8.22988E-12	9.25678E-13	8.88259E-10	-5.58476E-6	5.58317E-6	-2.52532E-8
M	-5.16687E-14	-1.97922E-13	-2.73106E-12	2.52779E-8	-2.52532E-8	1.50140E-10

Date of computation: 2026-03-17 23:26 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

0.05040

Unit

Source

[1]

Quality

Value

Unit

Source

[1]

Amplitude

Value

1.16

Unit

mag

Source

[1]

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

26.062

Unit

mag

Source

[2]

Slope Parameter (G)

Value

0.15**

Unit

Source

[2]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

0.05 - 0.25

Unit

Source

[3]

Diameter

Value

16 - 40*

Unit

Source

[3]

Color Index Information

Color Index Information

Value

Unit

Source

Color Index Information

Value

Unit

mag

Source

[-]

Sightings

Sightings

Value

Unit

Source

Sightings

Value

Unit

Source

[-]

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Sources

No.	Name	Additional
[1]	EARN	1.) Petr Pravec's Ondrejov NEO Photometric Program Webpage "Prepublished Periods" 2.) Christie, G.W. (2004) I.A.U. Circ. HREF="http://www.cbat.eps.harvard.edu/iauc/08300/08310.html"> 8310. (2004 FH) (rotation period and amplitude)
[2]	ESA Aegis	ESA orbit determination and impact monitoring system
[3]	Estimation	Estimated from absolute magnitude

Observational Information

Arc Length
Unobserved
Normalized RMS of residuals

Arc Information

Value

Unit

Source

Arc Length

Value

6185

Unit

Source

[1]

Unobserved

Value

1929

Unit

Source

[1]

Normalized RMS of residuals

Value

0.422953

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2004-03-16.34557

Unit

Source

[2]

Last Observation

Value

2021-02-19.975129

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

273 (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

Note: Ephemerides requests are limited to a maximum of 1000 points and a final date not exceeding 2040/12/31 00:00.

Close Approaches for 2004FH from 1950 to 2126

Body	Date in UTC	Time uncert. in min	Nominal distance in au	Min. possible distance in au	Distance uncert. in au
EARTH	1955-03-25 01:26	< 1 min	0.1401772	0.1400889	0.0000294
EARTH	1957-01-28 15:50	2.0	0.0609269	0.0608802	0.0000156
EARTH	1966-03-15 23:53	< 1 min	0.0159267	0.0159216	0.0000017
VENUS	1972-02-17 20:09	< 1 min	0.0457099	0.0457039	0.0000020
EARTH	1975-03-24 12:22	1.0	0.0505411	0.0504855	0.0000185
EARTH	1977-01-27 01:27	< 1 min	0.1637455	0.1636854	0.0000200
EARTH	1984-03-23 21:40	< 1 min	0.1662027	0.1661435	0.0000197
EARTH	1986-01-28 15:35	1.6	0.0604394	0.0604041	0.0000118
EARTH	1995-02-18 00:35	5.1	0.0466474	0.0466460	0.0000004
EARTH	2004-03-18 22:08	< 1 s	0.0003282	0.0003282	0.0000000
EARTH	2018-01-10 13:45	< 1 s	0.0512586	0.0512582	0.0000002
EARTH	2021-02-24 05:49	< 1 min	0.0632435	0.0632434	0.0000000
VENUS	2022-11-14 21:56	< 1 s	0.0123375	0.0123374	0.0000001
EARTH	2024-03-22 14:14	< 1 s	0.0930111	0.0930107	0.0000001
VENUS	2037-11-29 11:50	< 1 min	0.0481177	0.0481157	0.0000007
EARTH	2038-01-10 17:16	< 1 s	0.1468499	0.1468481	0.0000006
EARTH	2041-01-21 13:18	< 1 min	0.0411155	0.0411145	0.0000003
EARTH	2044-03-17 16:01	< 1 min	0.0120175	0.0120169	0.0000002
EARTH	2047-03-22 14:47	< 1 min	0.1253768	0.1253729	0.0000013
VENUS	2048-02-03 19:12	< 1 min	0.0089829	0.0089819	0.0000003
EARTH	2064-01-09 18:59	1.3	0.0614997	0.0612905	0.0000698
EARTH	2067-02-01 06:07	21.6	0.0605774	0.0605321	0.0000151
EARTH	2070-03-16 20:34	2.0	0.0185610	0.0185504	0.0000035
EARTH	2073-03-22 05:10	< 1 min	0.0891020	0.0889758	0.0000421
VENUS	2077-04-15 08:49	10.2	0.0227281	0.0225746	0.0000520
VENUS	2083-10-10 17:54	54.3	0.0102407	0.0094456	0.0002990
VENUS	2091-06-09 18:52	460.7	0.0212217	0.0211623	0.0004665
EARTH	2096-01-10 05:32	666.7	0.1729035	0.1089846	0.0213097
EARTH	2099-01-08 08:57	38.6	0.0790046	0.0037556	0.0294953
EARTH	2102-01-11 12:20	> 1 d	0.0054167	0.0036341	0.0212166
EARTH	2105-01-09 03:02	407.7	0.0625473	0.0016416	0.0860950
EARTH	2108-01-10 10:52	> 1 d	0.1318066	0.0001897	0.1641109
VENUS	2108-08-28 22:12	> 1 w	0.0331612	0.0171942	0.1919931
EARTH	2111-01-11 22:02	> 1 d	0.1993182	0.0031793	0.1987076
VENUS	2111-06-19 07:32	> 1 w	0.0071402	0.0037874	0.2037041
EARTH	2114-01-12 12:38	> 1 w	0.1864136	0.0102978	1.0854733
EARTH	2117-01-11 15:40	> 1 mo	0.1628732	0.0067502	2.5186439
EARTH	2120-01-11 22:40	> 1 mo	0.1418741	0.0058832	3.7238645
EARTH	2123-01-11 09:13	> 1 mo	0.1277690	0.0055539	4.6027507
EARTH	2126-01-11 00:11	> 1 mo	0.1214214	0.0054530	5.0468171

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
134.07368697	10.94598278	0.00048375	MINIMUM
221.38526372	76.45769098	0.00094581	MINIMUM
177.86995826	43.84819244	0.06737146	SADDLE
356.17006709	222.07343927	0.43062136	SADDLE
356.26019965	42.16750904	1.57095655	SADDLE
177.81716995	223.79337894	2.06893421	MAXIMUM

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MOID Plots

Click on the images to zoom-in and zoom-out

Level lines of the squared distance function

2004FH

Date in UTC	MJD	σ	σ_imp	Distance ± Width in RE	Stretching in RE	IP	Impact energy	PS	TS
2111-03-19.637	92163.637	-3.597	0.000	1.41 ± 0.009	1.10E5	1.62E-8	2.10E-1	-8.74	0


Based on 273 optical observations (of which 0 are rejected as outliers) from 2004/03/16.346 to 2021/02/19.975.
Coordinates are given on the Target Plane.
Unit is one Earth radius, but impact cross section has radius between 1.90 and 1.90 Earth radii.
Coordinates for LOV = KEP scaled= 2 second= F.
Aegis software version= 4.0, Date of computation=20250805 130500.123 UTC.

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Download Impactor Table as: