Asteroids

2005HC4 help

Last update: 2024-05-04 04:05 UTC

Orbital Properties

Epoch

60400.0

MJD

Orbit type

Apollo

Perihelion (q)

0.071

Aphelion (Q)

3.565

Eccentricity (e)

0.961

Inclination (i)

8.5

deg

Orbit period (P)

895.3

Earth MOID

0.05929

U parameter

9.0

Next Earth close approach

Date

2025-03-05

Nominal distance (from Earth center)

0.14533

21741787

Maximum Brightness

19.4

mag

Risk

Object is not in risk list

Object is not in priority list

Physical Properties

Absolute Magnitude (H)

20.6

mag

Diameter

200 - 400*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2005-04-30

Observatory

Lowell Observatory-LONEOS

Orbit Visualiser

Click the button to start Orbit Visualiser

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

60400.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

1.817894

1-sigma variation

0.026126

Unit

Eccentricity (e)

Value

0.961137

1-sigma variation

0.001214

Unit

Inclination (i)

Value

8.5475

1-sigma variation

0.0939

Unit

Long. of Ascending Node (Ω)

Value

62.4039

1-sigma variation

0.9751

Unit

Arg. of Perihelion (ω)

Value

310.4016

1-sigma variation

1.1086

Unit

Mean Anomaly (M)

Value

236.63229

1-sigma variation

57.16280

Unit

Perihelion distance

Value

0.070648

1-sigma variation

Unit

Aphelion distance

Value

3.565140

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.901065

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.644888

1-sigma variation

Unit

MOID

Value

0.059287

1-sigma variation

Unit

Orbit Period

Value

895.2645

1-sigma variation

Unit

U parameter

Value

9.0

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	6.82552E-4	3.17099E-5	2.45398E-3	-2.54754E-2	2.89639E-2	-1.49342E0
e	3.17099E-5	1.47320E-6	1.14006E-4	-1.18353E-3	1.34561E-3	-6.93810E-2
i	2.45398E-3	1.14006E-4	8.82325E-3	-9.15933E-2	1.04135E-1	-5.36929E0
Ω	-2.54754E-2	-1.18353E-3	-9.15933E-2	9.50843E-1	-1.08105E0	5.57400E1
ω	2.89639E-2	1.34561E-3	1.04135E-1	-1.08105E0	1.22908E0	-6.33728E1
M	-1.49342E0	-6.93810E-2	-5.36929E0	5.57400E1	-6.33728E1	3.26759E3

Date of computation: 2024-04-23 10:08 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

20.625

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

200 - 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

Unit

Source

[-]

Download this part as:

Sources

No.	Name	Additional
[1]	ESA ODIM	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

6932

Unit

Source

[1]

Normalized RMS of residuals

Value

0.622681

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2005-04-30.31003

Unit

Source

[2]

Last Observation

Value

2005-05-11.92802

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

53 (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

Unit

Source

[3]

Last Observation

Value

Unit

Source

[3]

Delay (Discarded)

Value

0 (0)

Unit

Source

[1]

Doppler (Discarded)

Value

0 (0)

Unit

Source

[1]

Total Radar Observations (Discarded)

Value

0 (0)

Unit

Source

[1]

Note: The ASCII file is in a format suitable for Orbfit input.

Sources

No.	Name	Additional
[1]	ESA ODIM	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 2005HC4 from 1950 to 2124

Body	Date in UTC	Time uncert. in min	Nominal distance in au	Min. possibile distance in au	Distance uncert. in au
EARTH	1956-04-26 00:37	> 1 mo	0.0958950	0.0686741	2.0335645
MERCURY	1971-02-01 02:40	> 1 mo	0.0410545	0.0188305	3.0378520
MERCURY	1990-10-04 18:46	> 1 mo	0.0298987	0.0057599	2.6198808
EARTH	1998-03-09 05:39	> 1 w	0.1512337	0.1407308	0.2425677
MERCURY	2010-05-04 21:45	> 1 w	0.0163616	0.0162975	0.0521437
EARTH	2025-03-05 22:40	> 1 mo	0.1453349	0.1432739	0.3798935
EARTH	2032-05-03 21:40	> 1 mo	0.1222057	0.0578993	2.8069189
MERCURY	2044-09-15 12:08	> 1 mo	0.0489324	0.0102833	8.8816307
MERCURY	2052-01-03 04:32	> 1 mo	0.0147707	0.0122898	3.7137469
EARTH	2059-04-23 01:43	> 1 mo	0.1756436	0.0544253	4.9289293
EARTH	2074-03-08 08:54	> 1 mo	0.1507802	0.1488690	0.9136298
EARTH	2081-05-06 16:09	> 1 mo	0.1673599	0.0519725	5.6270583
MERCURY	2086-05-17 03:30	> 1 mo	0.0479611	0.0122009	11.5737853
MERCURY	2093-09-04 16:04	> 1 mo	0.0415006	0.0091799	7.3552126
EARTH	2108-04-30 15:11	> 1 mo	0.0494763	0.0483242	0.7181589
VENUS	2110-10-25 05:08	> 1 mo	0.0206673	0.0000505	3.9532884
VENUS	2113-04-10 09:40	> 1 mo	0.0030763	0.0015881	0.8772808
VENUS	2115-09-27 12:13	> 1 mo	0.0383693	0.0015817	16.8843387

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