Asteroids

437844 1999MN help

Last update: 2025-07-11 12:57 UTC

Orbital Properties

Epoch

60800.0

MJD

Orbit type

Aten

Perihelion (q)

0.226

Aphelion (Q)

1.122

Eccentricity (e)

0.665

Inclination (i)

2.0

deg

Orbit period (P)

202.1

Earth MOID

0.00599

U parameter

0.1

A₂

38.0

10^-15au/days²

Next Earth close approach

Date

2026-06-03

Nominal distance (from Earth center)

0.16156

24168536

Maximum Brightness

21.5

mag

Risk

Object is not in risk list

Object is not in priority list

Physical Properties

Absolute Magnitude (H)

mag

Diameter

170 - 400*

Taxonomic type

Rotation period (T)

5.495

Discovery Information

Discovery Date

1999-06-22

Observatory

Catalina Sky Survey

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

60800.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

0.673995

1-sigma variation

1.292E-9

Unit

Eccentricity (e)

Value

0.665400

1-sigma variation

3.058E-8

Unit

Inclination (i)

Value

2.0349

1-sigma variation

5.203E-6

Unit

Long. of Ascending Node (Ω)

Value

81.4247

1-sigma variation

3.267E-5

Unit

Arg. of Perihelion (ω)

Value

9.1783

1-sigma variation

3.252E-5

Unit

Mean Anomaly (M)

Value

111.25258

1-sigma variation

0.00001

Unit

Perihelion distance

Value

0.225519

1-sigma variation

Unit

Aphelion distance

Value

1.122471

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.757972

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.078684

1-sigma variation

Unit

MOID

Value

0.005987

1-sigma variation

Unit

Orbit Period

Value

202.1079

1-sigma variation

Unit

U parameter

Value

0.1

1-sigma variation

Unit

A₂

Value

37.97334

1-sigma variation

1.16542

Unit

10^-15au/days²

Covariance Matrix

	a	e	i	Ω	ω	M	A₂
a	1.66875E-18	-1.83572E-17	1.00922E-15	1.62354E-15	-1.40384E-15	-1.08006E-14	9.49224E-10
e	-1.83572E-17	9.34910E-16	3.01811E-14	8.79711E-14	-8.35851E-14	1.02276E-13	-2.31388E-8
i	1.00922E-15	3.01811E-14	2.70663E-11	7.57319E-11	-7.14185E-11	-1.27340E-11	-2.97991E-6
Ω	1.62354E-15	8.79711E-14	7.57319E-11	1.06730E-9	-1.06203E-9	-2.75616E-12	-4.80558E-6
ω	-1.40384E-15	-8.35851E-14	-7.14185E-11	-1.06203E-9	1.05769E-9	1.15861E-13	4.35423E-6
M	-1.08006E-14	1.02276E-13	-1.27340E-11	-2.75616E-12	1.15861E-13	8.43882E-11	-3.40211E-6
A₂	9.49224E-10	-2.31388E-8	-2.97991E-6	-4.80558E-6	4.35423E-6	-3.40211E-6	1.35821E0

Date of computation: 2025-07-11 12:57 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

5.495

5.494

Unit

Source

[5]

[6]

Quality

Value

Unit

Source

[6]

[5]

Amplitude

Value

0.6-0.77

Unit

mag

Source

[6]

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

[1]

[2]

Taxonomy (all)

Value

Unit

Source

[3]

[4]

Absolute Magnitude (H)
Slope Parameter (G)

H / G

Value

Unit

Source

Absolute Magnitude (H)

Value

21.018

20.57

Unit

mag

Source

[7]

[2]

Slope Parameter (G)

Value

0.15**

0.32

Unit

mag

Source

[7]

[2]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

0.05 - 0.25

Unit

Source

[8]

Diameter

Value

170 - 400*

Unit

Source

[8]

Color Index Information

Color Index Information

Value

Unit

Source

Color Index Information

Value

0.77

0.43

Unit

B-V

V-R

Source

[2]

Sightings

Sightings

Value

Unit

Source

Sightings

Value

Radar R

Unit

Source

[9]

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Sources

No.	Name	Additional
[1]	EARN	1.) Michaël Marsset et al 2022 AJ 163 165
[2]	EARN	1.) Hicks, M. et al. (2010) href="http://www.astronomerstelegram.org/?read=2706"> ATel#2706 (Broadband Photometry of the Potentially Hazardous Asteroid 1999 MN: Suggestive of YORP and/or Tidal Spin-Up?)
[3]	EARN	Earth Asteroids Research Node: https://earn.dlr.de
[4]	EARN	1.) Hicks, M. et al. (2010) href="http://www.astronomerstelegram.org/?read=2706"> ATel#2706 (Broadband Photometry of the Potentially Hazardous Asteroid 1999 MN: Suggestive of YORP and/or Tidal Spin-Up?) 2.) Somers, J.M. et al. (2010) DPS 42, 1316. (abstract) (Optical Characterization Of Planetary Radar Targets, Low-deltaV, And Potentially Hazardous Asteroids: Results From 2009-2010)
[5]	EARN	1.) Hergenrother, C.W. & R.J. Whiteley (2005) B.A.A.S. 37, 636-637. (The Rotation State of Small Rapidly Rotating Asteroids)
[6]	EARN	1.) Hergenrother, C.W. & R.J. Whiteley (2011) Icarus 214, 194-209. (A survey of small fast rotating asteroids among the near-Earth asteroid population) (new data for 53 NEAs) 2.) Hicks, M. et al. (2010) href="http://www.astronomerstelegram.org/?read=2706"> ATel#2706 (Broadband Photometry of the Potentially Hazardous Asteroid 1999 MN: Suggestive of YORP and/or Tidal Spin-Up?) 3.) Hergenrother, C.W. & R.J. Whiteley (2005) B.A.A.S. 37, 636-637. (The Rotation State of Small Rapidly Rotating Asteroids)
[7]	ESA Aegis	ESA orbit determination and impact monitoring system
[8]	Estimation	Estimated from absolute magnitude
[9]	EARN	1.) href="http://echo.jpl.nasa.gov/asteroids/index.html">JPL's NEO Radar Detection Program Webpage

Observational Information

Arc Length
Unobserved
Normalized RMS of residuals

Arc Information

Value

Unit

Source

Arc Length

Value

9515

Unit

Source

[1]

Unobserved

Value

Unit

Source

[1]

Normalized RMS of residuals

Value

0.528739

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

1999-06-22.35417

Unit

Source

[2]

Last Observation

Value

2025-07-10.118948

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

286 (4)

Unit

Source

[1]

Radar Summary

First Observation
Last Observation
Delay (Discarded)
Doppler (Discarded)
Total Optical Observations (Discarded)

Radar

Value

Unit

Source

First Observation

Value

2004-07-22

Unit

Source

[3]

Last Observation

Value

2005-05-31

Unit

Source

[3]

Delay (Discarded)

Value

2 (0)

Unit

Source

[1]

Doppler (Discarded)

Value

2 (0)

Unit

Source

[1]

Total Radar Observations (Discarded)

Value

4 (0)

Unit

Source

[1]

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
[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 437844 1999MN 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	1952-07-10 05:59	< 1 s	0.1748799	0.1748786	0.0000004
EARTH	1953-06-08 12:52	< 1 min	0.0739073	0.0739067	0.0000002
MERCURY	1958-03-08 09:12	< 1 s	0.0309230	0.0309226	0.0000001
EARTH	1958-06-14 16:33	< 1 s	0.0977568	0.0977567	0.0000000
VENUS	1958-11-09 10:49	< 1 s	0.0376599	0.0376598	0.0000000
EARTH	1963-06-22 15:04	< 1 min	0.1069766	0.1069765	0.0000000
MERCURY	1963-09-21 22:54	< 1 min	0.0251330	0.0251311	0.0000006
VENUS	1964-05-24 03:27	< 1 s	0.0172465	0.0172451	0.0000005
EARTH	1968-07-01 02:54	< 1 min	0.0906430	0.0906427	0.0000001
VENUS	1969-12-06 08:11	< 1 s	0.0217937	0.0217928	0.0000003
EARTH	1973-07-09 05:42	< 1 s	0.0401058	0.0401057	0.0000000
EARTH	1974-06-01 21:58	< 1 s	0.1100197	0.1100194	0.0000001
VENUS	1975-06-20 07:22	< 1 s	0.0390079	0.0390072	0.0000002
EARTH	1978-07-12 11:38	< 1 s	0.0446722	0.0446714	0.0000003
EARTH	1979-06-02 04:43	< 1 s	0.0197905	0.0197895	0.0000003
MERCURY	1982-08-08 21:00	< 1 min	0.0300370	0.0300354	0.0000005
EARTH	1983-07-12 03:09	< 1 s	0.1294969	0.1294959	0.0000003
EARTH	1984-06-05 07:50	< 1 min	0.0501542	0.0501536	0.0000002
MERCURY	1988-02-19 10:32	< 1 min	0.0333109	0.0333098	0.0000004
EARTH	1989-06-14 15:13	< 1 min	0.0970048	0.0970046	0.0000001
MERCURY	1989-09-26 17:45	< 1 min	0.0153438	0.0153435	0.0000001
EARTH	1994-06-26 10:37	< 1 min	0.1031010	0.1031010	0.0000000
EARTH	1999-07-07 00:23	< 1 s	0.0647214	0.0647213	0.0000001
EARTH	2000-06-02 08:20	< 1 s	0.1494775	0.1494773	0.0000001
MERCURY	2003-01-28 14:27	< 1 s	0.0363344	0.0363343	0.0000000
EARTH	2004-07-11 12:14	< 1 s	0.0193396	0.0193394	0.0000000
EARTH	2005-06-01 10:17	< 1 s	0.0517380	0.0517379	0.0000000
MERCURY	2008-08-09 17:33	< 1 s	0.0345491	0.0345489	0.0000001
EARTH	2009-07-12 04:13	< 1 s	0.1036188	0.1036185	0.0000001
MERCURY	2010-03-18 01:06	< 1 s	0.0153119	0.0153118	0.0000000
EARTH	2010-06-04 11:30	< 1 s	0.0334197	0.0334196	0.0000000
EARTH	2015-06-13 23:14	< 1 s	0.0929954	0.0929953	0.0000000
VENUS	2016-03-22 20:18	< 1 s	0.0417259	0.0417257	0.0000001
EARTH	2020-06-25 01:33	< 1 s	0.1043183	0.1043183	0.0000000
VENUS	2021-10-04 12:16	< 1 s	0.0167928	0.0167927	0.0000000
MERCURY	2023-07-18 13:45	< 1 s	0.0195046	0.0195045	0.0000000
MERCURY	2025-02-23 15:21	< 1 min	0.0408409	0.0408405	0.0000001
EARTH	2025-07-05 15:31	< 1 s	0.0714031	0.0714030	0.0000000
EARTH	2026-06-03 06:25	< 1 s	0.1615567	0.1615564	0.0000001
VENUS	2027-04-18 08:13	< 1 s	0.0217100	0.0217097	0.0000001
EARTH	2030-07-11 21:05	< 1 s	0.0168409	0.0168408	0.0000000
MERCURY	2030-09-04 20:55	< 1 min	0.0347306	0.0347298	0.0000003
EARTH	2031-06-02 00:51	< 1 s	0.0597489	0.0597484	0.0000002
VENUS	2032-10-29 21:08	< 1 s	0.0471242	0.0471234	0.0000003
EARTH	2035-07-12 19:59	< 1 s	0.1002675	0.1002666	0.0000003
EARTH	2036-06-03 23:45	< 1 min	0.0317478	0.0317469	0.0000003
MERCURY	2038-06-25 14:28	< 1 min	0.0460338	0.0460319	0.0000007
VENUS	2041-04-19 03:32	< 1 min	0.0429723	0.0429707	0.0000005
EARTH	2041-06-14 10:17	< 1 min	0.0954960	0.0954957	0.0000001
MERCURY	2045-08-10 13:43	< 1 min	0.0432992	0.0432974	0.0000006
EARTH	2046-06-27 15:22	< 1 min	0.1014210	0.1014209	0.0000001
VENUS	2046-10-31 05:24	< 1 s	0.0097898	0.0097889	0.0000003
EARTH	2051-07-09 23:57	< 1 min	0.0396398	0.0396390	0.0000003
EARTH	2052-06-01 18:05	< 1 s	0.1038002	0.1037988	0.0000005
MERCURY	2053-05-27 08:16	< 1 min	0.0422345	0.0422321	0.0000008
MERCURY	2055-01-01 22:28	< 1 min	0.0307031	0.0307003	0.0000009
EARTH	2056-07-12 07:50	< 1 s	0.0764778	0.0764763	0.0000005
EARTH	2057-06-03 08:34	< 1 min	0.0159466	0.0159453	0.0000004
EARTH	2062-06-16 04:10	< 1 min	0.0983550	0.0983549	0.0000000
VENUS	2065-06-07 21:20	< 1 s	0.0461428	0.0461417	0.0000004
MERCURY	2066-08-29 18:46	< 1 min	0.0415076	0.0415058	0.0000006
EARTH	2067-07-03 12:15	< 1 min	0.0840097	0.0840091	0.0000002
MERCURY	2068-04-04 20:41	< 1 min	0.0395636	0.0395608	0.0000009
EARTH	2068-06-03 13:33	< 1 min	0.1804301	0.1804287	0.0000005
EARTH	2072-07-11 23:02	< 1 s	0.0260611	0.0260598	0.0000005
EARTH	2073-06-02 00:51	< 1 s	0.0312952	0.0312933	0.0000006
VENUS	2073-11-24 07:33	< 1 min	0.0491792	0.0491764	0.0000010
MERCURY	2076-01-17 00:05	< 1 min	0.0365861	0.0365830	0.0000010
EARTH	2077-07-10 21:12	< 1 min	0.1719708	0.1719691	0.0000006
MERCURY	2077-08-22 14:08	< 1 min	0.0394044	0.0394010	0.0000011
EARTH	2078-06-10 21:34	< 1 min	0.0797165	0.0797159	0.0000002
EARTH	2083-06-28 09:18	< 1 min	0.0998330	0.0998329	0.0000000
EARTH	2088-07-10 15:51	< 1 min	0.0237950	0.0237945	0.0000002
MERCURY	2089-04-17 20:36	< 1 min	0.0207570	0.0207565	0.0000002
EARTH	2089-06-01 21:41	< 1 s	0.0756793	0.0756781	0.0000004
MERCURY	2090-11-22 15:51	< 1 min	0.0160598	0.0160593	0.0000001
EARTH	2093-07-12 08:02	< 1 min	0.1123626	0.1123603	0.0000008
EARTH	2094-06-05 21:07	< 1 min	0.0441035	0.0441017	0.0000006
VENUS	2095-06-06 23:58	< 1 min	0.0366166	0.0366128	0.0000013
EARTH	2099-06-21 02:45	< 1 min	0.1043310	0.1043307	0.0000001
EARTH	2104-07-07 17:01	< 1 min	0.0635416	0.0635399	0.0000006
EARTH	2105-06-03 21:53	< 1 min	0.1390214	0.1390184	0.0000010
VENUS	2108-07-02 07:03	< 1 min	0.0343050	0.0343019	0.0000010
EARTH	2109-07-13 19:17	< 1 s	0.0602496	0.0602474	0.0000007
EARTH	2110-06-04 10:20	< 1 min	0.0067878	0.0067865	0.0000004
MERCURY	2111-12-06 12:04	< 1 min	0.0463141	0.0463101	0.0000013
EARTH	2115-06-21 01:42	< 1 min	0.1027930	0.1027927	0.0000001
MERCURY	2115-10-16 22:46	< 1 min	0.0195889	0.0195884	0.0000002
MERCURY	2117-05-20 19:32	< 1 min	0.0306266	0.0306225	0.0000014
MERCURY	2119-08-26 10:24	< 1 min	0.0499410	0.0499371	0.0000013
EARTH	2120-07-09 19:45	< 1 min	0.0450226	0.0450212	0.0000005
MERCURY	2121-03-30 23:02	< 1 min	0.0286901	0.0286863	0.0000013
EARTH	2121-06-03 07:24	< 1 s	0.1012292	0.1012270	0.0000007
EARTH	2125-07-13 02:15	< 1 min	0.1230395	0.1230376	0.0000006

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
139.36486312	149.05020709	0.00598685	MINIMUM
220.11455262	187.05548886	0.01691562	MINIMUM
179.92818816	168.15798504	0.10668550	SADDLE
358.98418932	347.01680078	0.75849601	SADDLE
358.94113766	166.95493046	1.24144244	SADDLE
179.80443075	348.10731204	2.10644251	MAXIMUM

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MOID Plots

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