Asteroids

2009HC help

Last update: 2025-10-23 00:43 UTC

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Apollo

Perihelion (q)

0.905

Aphelion (Q)

1.166

Eccentricity (e)

0.126

Inclination (i)

3.7

deg

Orbit period (P)

384.8

Earth MOID

0.00562

U parameter

0.2

Next Earth close approach

Date

2026-07-20

Nominal distance (from Earth center)

0.16423

24568420

Maximum Brightness

22.1

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

24.6

mag

Diameter

30 - 70*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2009-04-17

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

1.035425

1-sigma variation

5.327E-9

Unit

Eccentricity (e)

Value

0.125675

1-sigma variation

1.280E-7

Unit

Inclination (i)

Value

3.7344

1-sigma variation

2.486E-6

Unit

Long. of Ascending Node (Ω)

Value

203.4929

1-sigma variation

1.334E-5

Unit

Arg. of Perihelion (ω)

Value

271.7998

1-sigma variation

1.001E-5

Unit

Mean Anomaly (M)

Value

316.56449

1-sigma variation

0.00001

Unit

Perihelion distance

Value

0.905298

1-sigma variation

Unit

Aphelion distance

Value

1.165553

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.010896

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.026144

1-sigma variation

Unit

MOID

Value

0.005616

1-sigma variation

Unit

Orbit Period

Value

384.8368

1-sigma variation

Unit

U parameter

Value

0.2

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	2.83717E-17	-5.28348E-16	-1.81242E-15	-3.96689E-14	1.30178E-15	-1.99876E-14
e	-5.28348E-16	1.63791E-14	1.73257E-13	1.28310E-12	5.05130E-13	1.11303E-13
i	-1.81242E-15	1.73257E-13	6.17797E-12	1.89369E-11	2.69411E-12	-1.13593E-12
Ω	-3.96689E-14	1.28310E-12	1.89369E-11	1.77840E-10	2.85442E-12	-2.77151E-11
ω	1.30178E-15	5.05130E-13	2.69411E-12	2.85442E-12	1.00219E-10	-4.18117E-11
M	-1.99876E-14	1.11303E-13	-1.13593E-12	-2.77151E-11	-4.18117E-11	7.68681E-11

Date of computation: 2025-10-23 00:43 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

24.621

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

30 - 70*

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

6031

Unit

Source

[1]

Unobserved

Value

Unit

Source

[1]

Normalized RMS of residuals

Value

0.990543

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2009-04-17.23164

Unit

Source

[2]

Last Observation

Value

2025-10-21.400289

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

207 (8)

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 2009HC 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	1960-10-23 13:18	3.3	0.0918476	0.0918376	0.0000033
EARTH	1961-07-24 17:22	21.7	0.1721124	0.1720970	0.0000051
EARTH	1962-04-06 15:36	3.4	0.0333417	0.0332230	0.0000396
EARTH	1976-11-01 16:18	1.6	0.0452943	0.0452501	0.0000147
EARTH	1977-06-13 02:38	19.9	0.1609302	0.1609167	0.0000045
EARTH	1991-10-29 23:55	< 1 min	0.0171184	0.0171169	0.0000005
EARTH	1992-07-05 06:35	1.6	0.1709799	0.1709792	0.0000002
EARTH	1993-04-12 05:13	< 1 min	0.1133128	0.1133085	0.0000014
EARTH	2007-10-24 05:16	< 1 min	0.1334149	0.1334134	0.0000005
EARTH	2008-08-06 09:27	< 1 min	0.1683590	0.1683585	0.0000002
EARTH	2009-04-05 11:25	< 1 min	0.0130922	0.0130921	0.0000001
EARTH	2025-10-26 10:57	< 1 min	0.0219024	0.0219023	0.0000000
EARTH	2026-07-20 07:07	< 1 min	0.1642297	0.1642294	0.0000001
EARTH	2027-04-09 23:36	< 1 s	0.0160301	0.0160285	0.0000005
EARTH	2042-10-29 09:56	1.5	0.0622228	0.0621492	0.0000245
EARTH	2043-07-26 19:22	25.8	0.1697633	0.1697623	0.0000003
EARTH	2044-04-11 12:16	2.3	0.0378675	0.0378132	0.0000181
EARTH	2059-09-21 18:23	333.2	0.1227546	0.1223245	0.0001435
EARTH	2060-01-25 11:34	460.5	0.0949552	0.0948910	0.0000214
EARTH	2060-05-21 12:25	388.4	0.1261893	0.1257349	0.0001515
EARTH	2075-10-31 19:09	7.6	0.0452818	0.0448686	0.0001379
EARTH	2076-07-21 14:23	121.7	0.1707261	0.1706970	0.0000097
EARTH	2077-04-14 04:31	11.1	0.0633394	0.0631592	0.0000601
EARTH	2092-10-25 00:44	699.4	0.0724550	0.0691581	0.0011040
EARTH	2093-06-17 21:46	> 1 d	0.1562411	0.1551669	0.0003582
EARTH	2094-04-20 17:06	55.9	0.1969753	0.1935597	0.0011385
EARTH	2108-10-30 19:21	20.2	0.0885640	0.0874081	0.0003855
EARTH	2109-08-01 17:38	531.5	0.1710481	0.1709317	0.0000388
EARTH	2110-04-13 04:07	38.8	0.0342358	0.0329008	0.0004451
EARTH	2124-11-04 11:22	302.4	0.0426535	0.0320720	0.0038783
EARTH	2125-06-25 07:57	> 1 d	0.1654518	0.1620194	0.0011445

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
76.88016045	97.03027097	0.00561619	MINIMUM
285.43234617	293.22773719	0.01327229	MINIMUM
1.03800768	14.89172522	0.09989378	SADDLE
181.11457385	195.20063895	0.16404875	SADDLE
2.41123753	196.41493077	1.92183963	SADDLE
181.86213692	15.86269955	2.14853967	MAXIMUM

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MOID Plots

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