Asteroids

1999SF10 help

Last update: 2026-08-11 13:01 UTC

Orbital Properties

Epoch

61200.0

MJD

Orbit type

Apollo

Perihelion (q)

0.955

Aphelion (Q)

1.600

Eccentricity (e)

0.252

Inclination (i)

1.2

deg

Orbit period (P)

527.3

Earth MOID

0.00288

U parameter

0.0

Next Earth close approach

Date

2038-11-17

Nominal distance (from Earth center)

0.03539

5294023

Maximum Brightness

28.5

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

24.3

mag

Diameter

Taxonomic type

Rotation period (T)

0.04110

Discovery Information

Discovery Date

1999-09-30

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

1.277319

1-sigma variation

2.600E-9

Unit

Eccentricity (e)

Value

0.252491

1-sigma variation

1.451E-8

Unit

Inclination (i)

Value

1.1672

1-sigma variation

1.094E-6

Unit

Long. of Ascending Node (Ω)

Value

22.7510

1-sigma variation

0.0001

Unit

Arg. of Perihelion (ω)

Value

30.6811

1-sigma variation

0.0001

Unit

Mean Anomaly (M)

Value

138.03023

1-sigma variation

4.278E-6

Unit

Perihelion distance

Value

0.954808

1-sigma variation

Unit

Aphelion distance

Value

1.599829

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.014710

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.524640

1-sigma variation

Unit

MOID

Value

0.002882

1-sigma variation

Unit

Orbit Period

Value

527.2872

1-sigma variation

Unit

U parameter

Value

0.0

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	6.76142E-18	-2.04573E-17	2.15666E-15	-5.32259E-14	5.45204E-14	-6.37892E-17
e	-2.04573E-17	2.10477E-16	-9.68281E-15	1.40452E-13	-1.52479E-13	-1.05892E-14
i	2.15666E-15	-9.68281E-15	1.19593E-12	2.31047E-12	-2.81514E-12	1.26520E-12
Ω	-5.32259E-14	1.40452E-13	2.31047E-12	3.38573E-9	-3.35876E-9	-2.67038E-11
ω	5.45204E-14	-1.52479E-13	-2.81514E-12	-3.35876E-9	3.36623E-9	3.23180E-12
M	-6.37892E-17	-1.05892E-14	1.26520E-12	-2.67038E-11	3.23180E-12	1.82990E-11

Date of computation: 2026-08-11 13:01 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

0.04110

Unit

Source

[1]

Quality

Value

Unit

Source

[1]

Amplitude

Value

0.58

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

24.0

24.286

Unit

mag

Source

[2]

[3]

Slope Parameter (G)

Value

0.15**

Unit

Source

[3]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

medium

Unit

Source

[4]

Diameter

Value

Unit

Source

[4]

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]	EARN	1.) Pravec, P. et al. (2000) Icarus 147, 477-486. (Fast rotating asteroids 1999 TY2, 1999 SF10, and 1998 WB2) 2.) Whiteley, R.J. et al. (2002) Proceedings of ACM2002, ESA-SP500, pp. 473-480. (Monolithic fast-rotating asteroids) (H-values and rotation properties of 36 NEAs)
[2]	EARN	1.) Pravec, P. et al. (2000) Icarus 147, 477-486. (Fast rotating asteroids 1999 TY2, 1999 SF10, and 1998 WB2)
[3]	ESA Aegis	ESA orbit determination and impact monitoring system
[4]	EARN	1.) Binzel, R.P. et al. (2002) in "Asteroids III" (Eds. W.F.Bottke et al.), Univ.Ariz.Press, Tucson, USA, pp. 255-271. (Physical Properties of NEOs)

Observational Information

Arc Length
Unobserved
Normalized RMS of residuals

Arc Information

Value

Unit

Source

Arc Length

Value

9632

Unit

Source

[1]

Unobserved

Value

216

Unit

Source

[1]

Normalized RMS of residuals

Value

0.88447

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

1999-09-30.16385

Unit

Source

[2]

Last Observation

Value

2026-02-12.17413

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

147 (30)

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

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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 1999SF10 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	1956-12-13 07:40	< 1 min	0.0203550	0.0203536	0.0000005
EARTH	1967-01-09 01:40	< 1 s	0.1644914	0.1644913	0.0000000
MARS	1986-03-21 03:07	< 1 min	0.0365426	0.0365399	0.0000009
EARTH	1989-09-24 21:40	< 1 min	0.0870936	0.0870870	0.0000022
EARTH	1999-10-12 13:52	< 1 min	0.0076243	0.0076243	0.0000000
EARTH	2012-11-19 20:06	< 1 min	0.0346391	0.0346391	0.0000000
EARTH	2025-12-10 22:58	< 1 min	0.0209707	0.0209706	0.0000000
EARTH	2038-11-17 17:27	< 1 min	0.0353884	0.0353883	0.0000000
EARTH	2051-10-12 14:53	< 1 min	0.0107354	0.0107351	0.0000001
MARS	2067-01-19 08:50	2.2	0.0358289	0.0358192	0.0000032
EARTH	2067-10-05 04:58	2.5	0.0091249	0.0091068	0.0000060
EARTH	2077-12-28 12:08	79.3	0.0590145	0.0576943	0.0004408
EARTH	2090-09-14 13:01	26.8	0.1992473	0.1982060	0.0003471
EARTH	2100-12-10 19:33	526.4	0.0240877	0.0231075	0.0003424
MARS	2121-08-04 04:18	676.2	0.0318053	0.0254997	0.0023310
EARTH	2123-09-22 14:18	573.2	0.1070122	0.0915456	0.0051559

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
329.53214484	271.14797290	0.00288218	MINIMUM
24.05799190	340.18941732	0.01774608	MINIMUM
358.05188418	307.29229182	0.03632626	SADDLE
178.22574247	127.17465662	0.58959567	SADDLE
356.87961150	125.80663274	1.96500527	SADDLE
178.17936366	307.14824020	2.58960494	MAXIMUM

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MOID Plots

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