Asteroids

1999SF10 help

Last update: 2025-09-12 13:15 UTC

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Apollo

Perihelion (q)

0.955

Aphelion (Q)

1.604

Eccentricity (e)

0.254

Inclination (i)

1.2

deg

Orbit period (P)

528.6

Earth MOID

0.00383

U parameter

0.0

Next Earth close approach

Date

2025-12-10

Nominal distance (from Earth center)

0.02097

3137063

Maximum Brightness

20.6

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

61000.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

1.279469

1-sigma variation

3.583E-9

Unit

Eccentricity (e)

Value

0.253557

1-sigma variation

3.256E-8

Unit

Inclination (i)

Value

1.2081

1-sigma variation

3.457E-6

Unit

Long. of Ascending Node (Ω)

Value

25.8163

1-sigma variation

0.0001

Unit

Arg. of Perihelion (ω)

Value

27.9756

1-sigma variation

0.0001

Unit

Mean Anomaly (M)

Value

1.25082

1-sigma variation

0.00002

Unit

Perihelion distance

Value

0.955050

1-sigma variation

Unit

Aphelion distance

Value

1.603888

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.017954

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.537426

1-sigma variation

Unit

MOID

Value

0.003831

1-sigma variation

Unit

Orbit Period

Value

528.6192

1-sigma variation

Unit

U parameter

Value

0.0

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	1.28358E-17	-9.53117E-17	-6.57781E-15	1.35571E-13	-1.82801E-13	6.07762E-14
e	-9.53117E-17	1.06015E-15	2.27460E-16	-1.32778E-13	6.04280E-13	-4.90417E-13
i	-6.57781E-15	2.27460E-16	1.19499E-11	-2.21862E-10	2.16305E-10	-2.28000E-11
Ω	1.35571E-13	-1.32778E-13	-2.21862E-10	1.11691E-8	-1.01233E-8	1.91265E-10
ω	-1.82801E-13	6.04280E-13	2.16305E-10	-1.01233E-8	9.56000E-9	-5.07527E-10
M	6.07762E-14	-4.90417E-13	-2.28000E-11	1.91265E-10	-5.07527E-10	3.24740E-10

Date of computation: 2025-09-12 13:15 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

24.281

Unit

mag

Source

[2]

[3]

Slope Parameter (G)

Value

0.15**

Unit

mag

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

9479

Unit

Source

[1]

Unobserved

Value

Unit

Source

[1]

Normalized RMS of residuals

Value

0.65857

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

2025-09-12.07246

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

67 (6)

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 1999SF10 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	1956-12-13 07:29	1.3	0.0203633	0.0203606	0.0000009
EARTH	1967-01-09 01:40	< 1 min	0.1644908	0.1644905	0.0000001
MARS	1986-03-21 02:54	1.4	0.0365255	0.0365200	0.0000018
EARTH	1989-09-24 21:45	< 1 min	0.0870551	0.0870426	0.0000042
EARTH	1999-10-12 13:51	< 1 min	0.0076239	0.0076238	0.0000000
EARTH	2012-11-19 20:04	< 1 min	0.0346397	0.0346396	0.0000001
EARTH	2025-12-10 22:59	< 1 min	0.0209700	0.0209698	0.0000000
EARTH	2038-11-17 17:40	2.4	0.0353873	0.0353867	0.0000002
EARTH	2051-10-12 14:45	1.1	0.0107258	0.0107216	0.0000014
MARS	2067-01-19 05:12	31.5	0.0355024	0.0353604	0.0000474
EARTH	2067-10-05 09:11	37.0	0.0085193	0.0082563	0.0000878
EARTH	2077-12-19 21:08	> 1 d	0.0213317	0.0195793	0.0026753
EARTH	2090-09-14 19:25	> 1 d	0.1973844	0.0057688	0.0977327
EARTH	2100-12-23 11:29	> 1 w	0.0275177	0.0197284	0.0883919
EARTH	2113-12-06 19:48	> 1 mo	0.0282424	0.0210406	0.0457272
MARS	2115-12-14 16:03	> 1 w	0.0235243	0.0230074	0.0177244

Download as:

Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
329.96635461	275.13782956	0.00383068	MINIMUM
23.67970073	343.16825585	0.01781186	MINIMUM
358.12847420	310.83743583	0.03544799	SADDLE
178.25729144	130.66634035	0.59175604	SADDLE
356.91931655	129.30647222	1.96713646	SADDLE
178.21468556	310.64388028	2.59314476	MAXIMUM

Download:

MOID Plots

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