Asteroids

2004HR56 help

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

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Apollo

Perihelion (q)

0.877

Aphelion (Q)

2.236

Eccentricity (e)

0.437

Inclination (i)

6.0

deg

Orbit period (P)

709.3

Earth MOID

0.06073

U parameter

9.0

Next Earth close approach

Date

2037-03-24

Nominal distance (from Earth center)

0.06435

9626363

Maximum Brightness

19.8

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

mag

Diameter

70 - 150*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2004-04-25

Observatory

Steward Observatory, Kitt Peak-Spacewatch

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

1.556496

1-sigma variation

0.032378

Unit

Eccentricity (e)

Value

0.436849

1-sigma variation

0.011631

Unit

Inclination (i)

Value

5.9769

1-sigma variation

0.1368

Unit

Long. of Ascending Node (Ω)

Value

40.8221

1-sigma variation

0.6468

Unit

Arg. of Perihelion (ω)

Value

88.2748

1-sigma variation

0.7929

Unit

Mean Anomaly (M)

Value

79.43133

1-sigma variation

109.85200

Unit

Perihelion distance

Value

0.876542

1-sigma variation

Unit

Aphelion distance

Value

2.236450

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.251217

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.266874

1-sigma variation

Unit

MOID

Value

0.060732

1-sigma variation

Unit

Orbit Period

Value

709.2847

1-sigma variation

Unit

U parameter

Value

9.0

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	1.04835E-3	3.76556E-4	4.36412E-3	-2.09404E-2	2.55997E-2	-3.55680E0
e	3.76556E-4	1.35275E-4	1.56425E-3	-7.52201E-3	9.20350E-3	-1.27757E0
i	4.36412E-3	1.56425E-3	1.87244E-2	-8.70985E-2	1.05155E-1	-1.48049E1
Ω	-2.09404E-2	-7.52201E-3	-8.70985E-2	4.18286E-1	-5.11531E-1	7.10459E1
ω	2.55997E-2	9.20350E-3	1.05155E-1	-5.11531E-1	6.28712E-1	-8.68575E1
M	-3.55680E0	-1.27757E0	-1.48049E1	7.10459E1	-8.68575E1	1.20674E4

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

22.996

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

70 - 150*

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

Unit

Source

[-]

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Sources

No.	Name	Additional
[1]	ESA Aegis	ESA orbit determination and impact monitoring system
[2]	Estimation	Estimated from absolute magnitude

Observational Information

Arc Length
Unobserved
Normalized RMS of residuals

Arc Information

Value

Unit

Source

Arc Length

Value

Unit

Source

[1]

Unobserved

Value

7809

Unit

Source

[1]

Normalized RMS of residuals

Value

0.388275

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2004-04-25.33668

Unit

Source

[2]

Last Observation

Value

2004-04-28.33877

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

11 (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 2004HR56 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
MARS	1967-06-28 02:08	> 1 mo	0.0444231	0.0438624	0.6876534
EARTH	1969-03-15 20:49	> 1 mo	0.0905116	0.0606542	4.4581400
EARTH	1970-12-08 03:16	> 1 mo	0.0603391	0.0589970	0.8566191
EARTH	2004-03-05 17:10	547.1	0.1143396	0.1013887	0.0043170
MARS	2005-10-02 02:32	> 1 w	0.0317329	0.0230136	0.1853461
EARTH	2005-12-04 04:59	> 1 w	0.0678564	0.0598049	0.1494307
MARS	2025-10-17 05:27	> 1 mo	0.0488451	0.0462765	0.8512104
EARTH	2037-03-24 17:57	> 1 mo	0.0643483	0.0613363	1.3856777
EARTH	2038-12-14 16:03	> 1 mo	0.0794535	0.0589205	4.6234696
EARTH	2070-04-06 16:34	> 1 mo	0.1487713	0.0580421	31.9549138
EARTH	2072-01-30 10:00	> 1 mo	0.1449603	0.0449862	0.8189583
EARTH	2073-11-26 15:58	> 1 mo	0.1580284	0.0584387	32.9032763
EARTH	2105-03-22 21:39	> 1 mo	0.0726620	0.0593080	0.9902060
EARTH	2106-12-12 06:10	> 1 mo	0.0674257	0.0621829	1.5441497
MARS	2124-04-01 04:05	> 1 mo	0.0368777	0.0185789	24.3997533

Download as:

Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
324.65448823	333.18729551	0.06071838	MINIMUM
37.12055486	82.50481139	0.06282194	MINIMUM
1.11413195	28.13840182	0.14587000	SADDLE
180.42440593	207.31112530	1.23202009	SADDLE
1.05457341	208.02998619	1.88840101	SADDLE
180.38032045	27.27755671	3.21812326	MAXIMUM

Download:

MOID Plots

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