Asteroids

1999AO10 help

Last update: 2026-07-30 11:21 UTC

Orbital Properties

Epoch

61200.0

MJD

Orbit type

Aten

Perihelion (q)

0.811

Aphelion (Q)

1.013

Eccentricity (e)

0.111

Inclination (i)

2.6

deg

Orbit period (P)

318.1

Earth MOID

0.02156

U parameter

0.0

Next Earth close approach

Date

2032-09-14

Nominal distance (from Earth center)

0.1858

27796015

Maximum Brightness

32.9

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

24.3

mag

Diameter

40 - 80*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

1999-01-13

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

61200.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

0.912015

1-sigma variation

2.001E-9

Unit

Eccentricity (e)

Value

0.110904

1-sigma variation

2.466E-8

Unit

Inclination (i)

Value

2.5797

1-sigma variation

2.949E-6

Unit

Long. of Ascending Node (Ω)

Value

312.1703

1-sigma variation

1.128E-5

Unit

Arg. of Perihelion (ω)

Value

7.2218

1-sigma variation

2.543E-5

Unit

Mean Anomaly (M)

Value

316.93101

1-sigma variation

0.00002

Unit

Perihelion distance

Value

0.810869

1-sigma variation

Unit

Aphelion distance

Value

1.013161

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.203354

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.026799

1-sigma variation

Unit

MOID

Value

0.021561

1-sigma variation

Unit

Orbit Period

Value

318.1275

1-sigma variation

Unit

U parameter

Value

0.0

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	4.00496E-18	7.93998E-19	-7.92247E-16	9.77617E-15	-4.43732E-14	4.24119E-14
e	7.93998E-19	6.08286E-16	5.53260E-14	6.88311E-14	-7.87489E-14	2.53505E-14
i	-7.92247E-16	5.53260E-14	8.69948E-12	1.22593E-11	-1.77128E-11	8.03056E-12
Ω	9.77617E-15	6.88311E-14	1.22593E-11	1.27172E-10	-2.03308E-10	9.46224E-11
ω	-4.43732E-14	-7.87489E-14	-1.77128E-11	-2.03308E-10	6.46519E-10	-5.45155E-10
M	4.24119E-14	2.53505E-14	8.03056E-12	9.46224E-11	-5.45155E-10	5.53687E-10

Date of computation: 2026-07-30 11:21 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

24.347

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

40 - 80*

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

9927

Unit

Source

[1]

Unobserved

Value

170

Unit

Source

[1]

Normalized RMS of residuals

Value

0.722194

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

1999-01-13.50013

Unit

Source

[2]

Last Observation

Value

2026-03-19.11983

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

232 (1)

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

Filters

Initial Date: *

Final Date: *

Normalised Only accepted

Max residual (arcsec):

* - these fields are required

Plot

Computation parameters

As seen from:

Initial Date: *

Final Date: *

Output option:

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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 1999AO10 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	1951-09-15 00:08	< 1 min	0.1891718	0.1891715	0.0000001
EARTH	1952-03-20 00:35	< 1 s	0.1737367	0.1737353	0.0000005
EARTH	1964-12-29 13:13	< 1 min	0.0700100	0.0700090	0.0000003
EARTH	1965-06-06 17:21	< 1 min	0.1609532	0.1609528	0.0000001
EARTH	1972-02-19 01:53	< 1 min	0.0274189	0.0274188	0.0000000
EARTH	1978-09-27 06:42	< 1 min	0.1761518	0.1761515	0.0000001
EARTH	1979-03-20 16:00	< 1 min	0.1178380	0.1178368	0.0000004
EARTH	1991-12-29 08:41	< 1 s	0.1629734	0.1629729	0.0000002
EARTH	1992-06-30 13:27	< 1 min	0.1866499	0.1866497	0.0000001
EARTH	1999-01-17 13:34	< 1 min	0.0226753	0.0226752	0.0000000
EARTH	2005-10-02 15:21	< 1 min	0.1692849	0.1692847	0.0000000
EARTH	2006-03-18 13:16	< 1 min	0.0983432	0.0983429	0.0000001
EARTH	2018-12-27 17:53	< 1 min	0.1200100	0.1200096	0.0000001
EARTH	2019-06-18 23:35	< 1 min	0.1763410	0.1763409	0.0000000
EARTH	2026-02-14 10:07	< 1 min	0.0267884	0.0267883	0.0000000
EARTH	2032-09-14 20:38	< 1 min	0.1858049	0.1858048	0.0000000
EARTH	2033-03-17 04:54	< 1 s	0.1593551	0.1593547	0.0000001
EARTH	2045-12-26 12:37	< 1 min	0.0796133	0.0796125	0.0000003
EARTH	2046-06-06 15:00	< 1 min	0.1639646	0.1639643	0.0000001
EARTH	2053-02-19 22:00	< 1 min	0.0262586	0.0262586	0.0000000
EARTH	2059-09-17 09:32	< 1 min	0.1830707	0.1830706	0.0000000
EARTH	2060-03-16 09:35	< 1 min	0.1470152	0.1470149	0.0000001
EARTH	2072-12-24 23:10	< 1 min	0.1162021	0.1162017	0.0000001
EARTH	2073-06-15 17:07	< 1 min	0.1750414	0.1750412	0.0000000
EARTH	2080-01-31 12:22	< 1 min	0.0270812	0.0270811	0.0000000
EARTH	2086-09-21 22:17	< 1 min	0.1774062	0.1774061	0.0000000
EARTH	2087-03-16 03:51	< 1 min	0.1233445	0.1233441	0.0000001
EARTH	2099-12-24 11:22	< 1 min	0.1343165	0.1343155	0.0000003
EARTH	2100-06-20 04:20	< 1 min	0.1803278	0.1803276	0.0000001
EARTH	2107-01-25 00:24	< 1 min	0.0261545	0.0261544	0.0000000
EARTH	2113-09-22 13:49	< 1 min	0.1766670	0.1766668	0.0000001
EARTH	2114-03-15 14:53	< 1 min	0.1195514	0.1195506	0.0000003
EARTH	2126-12-23 20:13	< 1 min	0.1059818	0.1059815	0.0000001

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
145.40174904	3.80716808	0.02156080	MINIMUM
203.12183760	54.92985738	0.02554840	MINIMUM
180.16868671	34.59905553	0.02732201	SADDLE
354.81012903	209.77535089	0.20337385	SADDLE
354.84501305	29.79776492	1.79691425	SADDLE
175.61069775	210.56686386	2.02731992	MAXIMUM

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MOID Plots

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