Asteroids

2009HC help

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

Orbital Properties

Epoch

61200.0

MJD

Orbit type

Apollo

Perihelion (q)

0.905

Aphelion (Q)

1.165

Eccentricity (e)

0.125

Inclination (i)

3.7

deg

Orbit period (P)

384.5

Earth MOID

0.00624

U parameter

0.0

Next Earth close approach

Date

2026-07-20

Nominal distance (from Earth center)

0.16423

24568513

Maximum Brightness

22.2

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

61200.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

1.034862

1-sigma variation

4.264E-9

Unit

Eccentricity (e)

Value

0.125290

1-sigma variation

9.524E-8

Unit

Inclination (i)

Value

3.7314

1-sigma variation

4.747E-6

Unit

Long. of Ascending Node (Ω)

Value

203.4137

1-sigma variation

1.273E-5

Unit

Arg. of Perihelion (ω)

Value

271.8366

1-sigma variation

1.816E-5

Unit

Mean Anomaly (M)

Value

143.80213

1-sigma variation

0.00001

Unit

Perihelion distance

Value

0.905205

1-sigma variation

Unit

Aphelion distance

Value

1.164520

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.012123

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.025336

1-sigma variation

Unit

MOID

Value

0.006244

1-sigma variation

Unit

Orbit Period

Value

384.5230

1-sigma variation

Unit

U parameter

Value

0.0

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	1.81801E-17	-1.48449E-16	1.09219E-14	2.48910E-15	-1.39475E-14	-7.77032E-15
e	-1.48449E-16	9.07083E-15	-6.09277E-14	4.48048E-13	1.08750E-12	-4.10074E-13
i	1.09219E-14	-6.09277E-14	2.25321E-11	4.09492E-11	-5.75512E-11	6.08622E-12
Ω	2.48910E-15	4.48048E-13	4.09492E-11	1.62069E-10	-8.99057E-11	-1.94731E-11
ω	-1.39475E-14	1.08750E-12	-5.75512E-11	-8.99057E-11	3.29839E-10	-9.94869E-11
M	-7.77032E-15	-4.10074E-13	6.08622E-12	-1.94731E-11	-9.94869E-11	6.62021E-11

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

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

24.64

Unit

mag

Source

[1]

Slope Parameter (G)

Value

0.15**

Unit

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

6041

Unit

Source

[1]

Unobserved

Value

189

Unit

Source

[1]

Normalized RMS of residuals

Value

0.827627

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

2025-10-31.337183

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

240 (20)

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 2009HC 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	1960-10-23 12:13	6.5	0.0918848	0.0918731	0.0000039
EARTH	1961-07-24 19:05	40.9	0.1720314	0.1720010	0.0000101
EARTH	1962-04-06 14:38	6.8	0.0327043	0.0324703	0.0000781
EARTH	1976-11-01 16:52	3.2	0.0455317	0.0454435	0.0000294
EARTH	1977-06-13 00:58	39.3	0.1608605	0.1608340	0.0000088
EARTH	1991-10-29 23:56	< 1 min	0.0171098	0.0171068	0.0000010
EARTH	1992-07-05 06:28	2.8	0.1709789	0.1709781	0.0000003
EARTH	1993-04-12 05:14	< 1 min	0.1133285	0.1133216	0.0000023
EARTH	2007-10-24 05:16	< 1 min	0.1334123	0.1334113	0.0000003
EARTH	2008-08-06 09:26	< 1 min	0.1683597	0.1683593	0.0000001
EARTH	2009-04-05 11:25	< 1 min	0.0130925	0.0130923	0.0000001
EARTH	2025-10-26 10:57	< 1 s	0.0219020	0.0219020	0.0000000
EARTH	2026-07-20 07:07	< 1 min	0.1642304	0.1642301	0.0000001
EARTH	2027-04-09 23:36	< 1 s	0.0160287	0.0160275	0.0000004
EARTH	2042-10-29 10:00	1.2	0.0621695	0.0621138	0.0000186
EARTH	2043-07-26 19:04	19.5	0.1697644	0.1697637	0.0000002
EARTH	2044-04-11 12:21	1.8	0.0379068	0.0378657	0.0000137
EARTH	2059-09-21 23:42	251.7	0.1224424	0.1221157	0.0001089
EARTH	2060-01-25 02:35	348.1	0.0950009	0.0949553	0.0000152
EARTH	2060-05-21 19:00	293.6	0.1265177	0.1261762	0.0001139
EARTH	2075-10-31 18:51	5.7	0.0455817	0.0452680	0.0001047
EARTH	2076-07-21 15:43	92.6	0.1707474	0.1707257	0.0000072
EARTH	2077-04-14 04:03	8.4	0.0632083	0.0630702	0.0000460
EARTH	2092-10-23 16:29	588.5	0.0748371	0.0723713	0.0008247
EARTH	2093-06-17 02:15	1247.5	0.1554545	0.1546223	0.0002775
EARTH	2094-04-20 20:31	41.9	0.1994518	0.1968577	0.0008647
EARTH	2108-10-30 18:33	11.5	0.0892927	0.0886446	0.0002161
EARTH	2109-08-01 22:48	313.0	0.1709700	0.1708942	0.0000253
EARTH	2110-04-13 02:49	22.5	0.0333669	0.0325613	0.0002686
EARTH	2124-11-03 18:27	381.7	0.0504896	0.0432755	0.0024720
EARTH	2125-06-22 16:28	> 1 d	0.1631230	0.1608898	0.0007446

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
76.88026324	97.03025655	0.00561636	MINIMUM
285.43227230	293.22750601	0.01327211	MINIMUM
1.03803591	14.89162077	0.09989452	SADDLE
181.11458271	195.20050576	0.16404936	SADDLE
2.41120992	196.41476461	1.92183924	SADDLE
181.86211141	15.86253545	2.14853990	MAXIMUM

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MOID Plots

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