Asteroids

2009HK73 help

Last update: 2024-04-19 00:04 UTC

Orbital Properties

Epoch

60400.0

MJD

Orbit type

Apollo

Perihelion (q)

0.893

Aphelion (Q)

1.597

Eccentricity (e)

0.283

Inclination (i)

5.6

deg

Orbit period (P)

507.6

Earth MOID

0.00183

U parameter

7.1

Next Earth close approach

Date

2034-05-08

Nominal distance (from Earth center)

0.11955

17884889

Maximum Brightness

24.6

mag

Risk

Object is not in risk list

Object is not in priority list

Physical Properties

Absolute Magnitude (H)

26.3

mag

Diameter

14 - 30*

Taxonomic type

Rotation period (T)

0.04999

Discovery Information

Discovery Date

2009-04-29

Observatory

Catalina Sky Survey

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

1.245392

1-sigma variation

0.000204

Unit

Eccentricity (e)

Value

0.282586

1-sigma variation

0.000107

Unit

Inclination (i)

Value

5.6279

1-sigma variation

0.0026

Unit

Long. of Ascending Node (Ω)

Value

215.8656

1-sigma variation

0.0047

Unit

Arg. of Perihelion (ω)

Value

300.5242

1-sigma variation

0.0140

Unit

Mean Anomaly (M)

Value

300.82034

1-sigma variation

0.83943

Unit

Perihelion distance

Value

0.893462

1-sigma variation

Unit

Aphelion distance

Value

1.597323

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.004134

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.345298

1-sigma variation

Unit

MOID

Value

0.001831

1-sigma variation

Unit

Orbit Period

Value

507.6423

1-sigma variation

Unit

U parameter

Value

7.1

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	4.16396E-8	2.18262E-8	5.29946E-7	9.53965E-7	-2.85404E-6	-1.71292E-4
e	2.18262E-8	1.14416E-8	2.77826E-7	5.00110E-7	-1.49631E-6	-8.97858E-5
i	5.29946E-7	2.77826E-7	6.74758E-6	1.21455E-5	-3.63382E-5	-2.18003E-3
Ω	9.53965E-7	5.00110E-7	1.21455E-5	2.18637E-5	-6.54105E-5	-3.92430E-3
ω	-2.85404E-6	-1.49631E-6	-3.63382E-5	-6.54105E-5	1.95718E-4	1.17406E-2
M	-1.71292E-4	-8.97858E-5	-2.18003E-3	-3.92430E-3	1.17406E-2	7.04642E-1

Date of computation: 2024-02-21 14:29 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

0.04999

Unit

Source

[1]

Quality

Value

Unit

Source

[1]

Amplitude

Value

0.27

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

26.322

Unit

mag

Source

[2]

Slope Parameter (G)

Value

0.15**

Unit

mag

Source

[2]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

0.05 - 0.25

Unit

Source

[3]

Diameter

Value

14 - 30*

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.) Statler, T.S. et al. (2013) Icarus 225, 141-155. (Size matters: The rotation rates of small near-Earth asteroids) (phtometry of 83 NEAs, 20 new rotation periods )
[2]	ESA ODIM	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

Unit

Source

[1]

Unobserved

Value

5447

Unit

Source

[1]

Normalized RMS of residuals

Value

0.377687

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2009-04-29.34112

Unit

Source

[2]

Last Observation

Value

2009-05-21.26763

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

45 (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

[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 2009HK73 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	1962-12-13 09:20	1123.3	0.1908507	0.1438673	0.0163320
EARTH	1967-03-24 17:14	> 1 w	0.1086672	0.0740884	0.0122211
EARTH	1986-01-13 12:03	> 1 w	0.1173890	0.0887842	0.0132565
EARTH	1990-05-06 17:31	> 1 d	0.1079540	0.0260878	0.0273660
EARTH	2004-12-21 16:12	516.0	0.0895799	0.0865283	0.0014844
EARTH	2009-04-27 12:54	< 1 min	0.0031471	0.0031431	0.0000013
EARTH	2016-01-09 23:40	> 1 d	0.1026565	0.0924182	0.0040790
MARS	2022-09-08 19:39	179.9	0.0468628	0.0468574	0.0001634
EARTH	2034-05-08 06:27	> 1 d	0.1195531	0.0179626	0.0341469
EARTH	2041-03-10 21:12	> 1 w	0.1181358	0.0945906	0.0093166
EARTH	2047-12-22 12:33	> 1 d	0.1352528	0.0893180	0.0209924
MARS	2054-08-30 13:45	295.7	0.0462283	0.0460887	0.0010950
EARTH	2066-04-21 02:37	847.6	0.0393285	0.0310065	0.0027829
EARTH	2066-04-21 01:58	851.4	0.0393284	0.0310087	0.0027774
EARTH	2072-12-24 04:55	1207.8	0.1065924	0.0905321	0.0070484
EARTH	2084-05-10 05:38	> 1 d	0.1529065	0.0489170	0.0347808
EARTH	2091-02-09 06:04	> 1 w	0.1243728	0.1166353	0.0059946
EARTH	2109-04-20 06:14	> 1 w	0.0469023	0.0065050	0.0480969
EARTH	2115-12-21 01:41	1391.6	0.1678372	0.1297684	0.0135017

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