Asteroids

2009BH2 help

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

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Aten

Perihelion (q)

0.427

Aphelion (Q)

1.202

Eccentricity (e)

0.476

Inclination (i)

23.2

deg

Orbit period (P)

268.3

Earth MOID

0.00092

U parameter

1.8

Next Earth close approach

Date

2031-01-21

Nominal distance (from Earth center)

0.15166

22688414

Maximum Brightness

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

22.5

mag

Diameter

80 - 190*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2009-01-17

Observatory

Lincoln Laboratory ETS, New Mexico

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

0.814158

1-sigma variation

1.115E-8

Unit

Eccentricity (e)

Value

0.475776

1-sigma variation

0.000002

Unit

Inclination (i)

Value

23.1900

1-sigma variation

0.0002

Unit

Long. of Ascending Node (Ω)

Value

117.0826

1-sigma variation

1.724E-5

Unit

Arg. of Perihelion (ω)

Value

220.9961

1-sigma variation

1.477E-5

Unit

Mean Anomaly (M)

Value

70.79554

1-sigma variation

0.00039

Unit

Perihelion distance

Value

0.426801

1-sigma variation

Unit

Aphelion distance

Value

1.201515

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.001458

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.554033

1-sigma variation

Unit

MOID

Value

0.000923

1-sigma variation

Unit

Orbit Period

Value

268.3252

1-sigma variation

Unit

U parameter

Value

1.8

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	1.24373E-16	2.76052E-14	2.01589E-12	1.53839E-13	-1.30935E-13	-4.33957E-12
e	2.76052E-14	6.17371E-12	4.46778E-10	3.48334E-11	-2.87370E-11	-9.70232E-10
i	2.01589E-12	4.46778E-10	3.62545E-8	3.00314E-9	-2.60920E-9	-7.02024E-8
Ω	1.53839E-13	3.48334E-11	3.00314E-9	2.97204E-10	-2.33445E-10	-5.47719E-9
ω	-1.30935E-13	-2.87370E-11	-2.60920E-9	-2.33445E-10	2.18223E-10	4.50460E-9
M	-4.33957E-12	-9.70232E-10	-7.02024E-8	-5.47719E-9	4.50460E-9	1.52506E-7

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

22.482

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

80 - 190*

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 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

4027

Unit

Source

[1]

Unobserved

Value

2093

Unit

Source

[1]

Normalized RMS of residuals

Value

0.487635

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2009-01-17.38656

Unit

Source

[2]

Last Observation

Value

2020-01-27.24968

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

168 (2)

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 2009BH2 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	1959-01-19 17:47	< 1 min	0.1114132	0.1113536	0.0000199
EARTH	1962-01-22 04:21	1.1	0.1953415	0.1953045	0.0000123
MERCURY	1972-11-03 13:11	< 1 min	0.0234402	0.0234270	0.0000044
EARTH	1973-01-17 00:55	< 1 min	0.0141444	0.0141353	0.0000030
EARTH	1984-01-19 08:16	< 1 min	0.0816304	0.0816267	0.0000012
MERCURY	1987-07-14 06:34	< 1 min	0.0198418	0.0198407	0.0000004
EARTH	1995-01-22 12:16	< 1 min	0.1992645	0.1992639	0.0000002
EARTH	1998-01-19 04:59	< 1 min	0.1416625	0.1416620	0.0000002
MERCURY	2002-03-24 07:07	< 1 min	0.0288068	0.0287953	0.0000038
EARTH	2009-01-17 02:19	< 1 s	0.0410712	0.0410702	0.0000004
MERCURY	2016-11-30 02:28	< 1 min	0.0189666	0.0189577	0.0000030
EARTH	2020-01-18 15:08	< 1 min	0.0390900	0.0390898	0.0000001
EARTH	2031-01-21 04:10	< 1 min	0.1516627	0.1516589	0.0000013
MERCURY	2031-08-10 04:32	< 1 min	0.0193338	0.0193232	0.0000035
EARTH	2034-01-21 11:46	< 1 min	0.1818969	0.1818922	0.0000016
EARTH	2045-01-17 10:10	< 1 min	0.0754130	0.0753983	0.0000049
MERCURY	2046-04-20 15:53	1.2	0.0288481	0.0288153	0.0000109
EARTH	2056-01-18 11:51	< 1 min	0.0205773	0.0205574	0.0000066
EARTH	2067-01-22 19:14	< 1 min	0.1979269	0.1978760	0.0000169
EARTH	2070-01-18 21:03	< 1 min	0.1277827	0.1277205	0.0000207
MERCURY	2074-03-26 13:45	3.9	0.0290327	0.0289404	0.0000308
EARTH	2081-01-18 00:17	< 1 min	0.0310321	0.0309038	0.0000428
MERCURY	2088-03-17 20:33	< 1 min	0.0394284	0.0394028	0.0000085
EARTH	2095-01-18 02:27	< 1 min	0.0775909	0.0775285	0.0000208
MERCURY	2101-06-16 05:58	7.0	0.0250715	0.0249017	0.0000568
EARTH	2106-01-21 13:13	2.9	0.1264921	0.1262762	0.0000719
EARTH	2109-01-22 09:37	6.6	0.1822361	0.1820274	0.0000696
MERCURY	2114-09-13 03:38	15.1	0.0210664	0.0208449	0.0000754
EARTH	2120-01-19 13:29	2.2	0.0060155	0.0056577	0.0001200

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
115.93669426	14.69812961	0.00094454	MINIMUM
249.24029054	99.14718652	0.39478416	MINIMUM
219.15739489	77.00752038	0.40008330	SADDLE
10.59489529	253.55644473	0.61418618	SADDLE
2.62790527	59.79539812	1.40660889	SADDLE
175.09801553	229.98015058	2.19393765	MAXIMUM

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MOID Plots

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