Asteroids

163899 2003SD220 help

Last update: 2026-03-17 23:26 UTC

Orbital Properties

Epoch

61200.0

MJD

Orbit type

Aten

Perihelion (q)

0.654

Aphelion (Q)

1.001

Eccentricity (e)

0.209

Inclination (i)

8.5

deg

Orbit period (P)

275.1

Earth MOID

0.01799

U parameter

0.0

Next Earth close approach

Date

2027-11-12

Nominal distance (from Earth center)

0.13819

20672688

Maximum Brightness

16.1

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

17.5

mag

Diameter

760

Taxonomic type

Rotation period (T)

280

Discovery Information

Discovery Date

2003-09-29

Observatory

Lowell Observatory-LONEOS

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

0.827898

1-sigma variation

9.058E-11

Unit

Eccentricity (e)

Value

0.209448

1-sigma variation

5.734E-9

Unit

Inclination (i)

Value

8.5480

1-sigma variation

3.431E-7

Unit

Long. of Ascending Node (Ω)

Value

273.6264

1-sigma variation

5.450E-7

Unit

Arg. of Perihelion (ω)

Value

327.0186

1-sigma variation

2.680E-6

Unit

Mean Anomaly (M)

Value

193.58026

1-sigma variation

4.036E-6

Unit

Perihelion distance

Value

0.654496

1-sigma variation

Unit

Aphelion distance

Value

1.001300

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.343237

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.023530

1-sigma variation

Unit

MOID

Value

0.017989

1-sigma variation

Unit

Orbit Period

Value

275.1461

1-sigma variation

Unit

U parameter

Value

0.0

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	8.20411E-21	-4.75852E-19	7.75140E-18	-1.29590E-17	2.34376E-16	-3.57492E-16
e	-4.75852E-19	3.28766E-17	-9.70170E-16	1.62689E-15	-1.36037E-14	1.97241E-14
i	7.75140E-18	-9.70170E-16	1.17751E-13	-1.78327E-13	3.43848E-13	-2.97705E-13
Ω	-1.29590E-17	1.62689E-15	-1.78327E-13	2.97058E-13	-5.29019E-13	4.33809E-13
ω	2.34376E-16	-1.36037E-14	3.43848E-13	-5.29019E-13	7.18499E-12	-1.06461E-11
M	-3.57492E-16	1.97241E-14	-2.97705E-13	4.33809E-13	-1.06461E-11	1.62921E-11

Date of computation: 2026-03-17 23:26 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

280

285

125

Unit

Source

[2]

[7]

[1]

Quality

Value

1,T,U

Unit

Source

[7]

Amplitude

Value

2.4

2.2

1.39

Unit

mag

Source

[2]

[7]

[1]

Rotation Direction

Value

Unit

Source

[-]

Spinvector L

Value

107

Unit

Source

[1]

Spinvector B

Value

Unit

Source

[1]

Taxonomy
Taxonomy (all)

Taxonomy

Value

Unit

Source

Taxonomy

Value

Unit

Source

[3]

[4]

Taxonomy (all)

Value

S/Sr

Unit

Source

[5]

[6]

Absolute Magnitude (H)
Slope Parameter (G)

H / G

Value

Unit

Source

Absolute Magnitude (H)

Value

17.462

Unit

mag

Source

[8]

Slope Parameter (G)

Value

0.15**

Unit

Source

[8]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

0.282

0.31

Unit

Source

[9]

[10]

Diameter

Value

760

Unit

Source

[9]

Color Index Information

Color Index Information

Value

Unit

Source

Color Index Information

Value

Unit

mag

Source

[-]

Sightings

Sightings

Value

Unit

Source

Sightings

Value

Radar R

Visual S

Unit

Source

[11]

[12]

Download this part as:

Sources

No.	Name	Additional
[1]	EARN	1.) Near-Earth Asteroid Lightcurve Analysis at the Center for Solar System Studies: 2018 September-December, B.D. Warner
[2]	EARN	1.) Lowell Observatory Near-Earth Asteroid Photometric Survey (NEAPS): Paper 3. Skiff, Brian A et al.
[3]	EARN	1.) Perna, D. et al. (2016) Astron. J. 151, 11(14p). (GRASPING THE NATURE OF POTENTIALLY HAZARDOUS ASTEROIDS) (spectra of 14 PHAs)
[4]	EARN	1.) Michaël Marsset et al 2022 AJ 163 165
[5]	EARN	1.) Perna, D. et al. (2016) Astron. J. 151, 11(14p). (GRASPING THE NATURE OF POTENTIALLY HAZARDOUS ASTEROIDS) (spectra of 14 PHAs) 2.) DeMeo, F.E. et al. (2014) Icarus 227, 112-122. (Mars encounters cause fresh surfaces on some near-Earth asteroids) (contains taxonomic classification of 249 NEAs)
[6]	EARN	Earth Asteroids Research Node: https://earn.dlr.de
[7]	EARN	1.) Warner, B.D. (2016) MPB 43, 143-154. (NEAR-EARTH ASTEROID LIGHTCURVE ANALYSIS AT CS3-PALMER DIVIDE STATION: 2015 OCTOBER-DECEMBER)(36NEAs) 2.) Carbognani, A. & L. Buzzi (2016) MPB 43, 160-163. (ASTEROIDS LIGHTCURVES ANALYSIS: 2015 OCTOBER-DECEMBER)(.., 112985,155110,163899,253106,337866,2015XC)
[8]	ESA Aegis	ESA orbit determination and impact monitoring system
[9]	EARN	1.) Joseph R. Masiero et al 2020 Planet. Sci. J. 1 5
[10]	EARN	1.) Nugent, C.R. et al. (2016) Astron. J. 152_63 (12pp) (NEOWISE Reactivation Mission Year Two: Asteroid Diameters and Albedos) (207 NEOs)
[11]	EARN	1.) href="http://echo.jpl.nasa.gov/asteroids/index.html">JPL's NEO Radar Detection Program Webpage
[12]	EARN	1.) Binzel, R.P. et al. (2006) LPSC 37, 1491. (The MIT-Hawaii-IRTF joint campaign for NEO spectral reconnaissance.) 2.) Binzel, R.P. et al. href="http://smass.mit.edu/minus.html"> Webpage 3.) Perna, D. et al. (2016) Astron. J. 151, 11(14p). (GRASPING THE NATURE OF POTENTIALLY HAZARDOUS ASTEROIDS) (spectra of 14 PHAs)

Observational Information

Arc Length
Unobserved
Normalized RMS of residuals

Arc Information

Value

Unit

Source

Arc Length

Value

9153

Unit

Source

[1]

Unobserved

Value

467

Unit

Source

[1]

Normalized RMS of residuals

Value

0.349994

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2000-01-06.07738

Unit

Source

[2]

Last Observation

Value

2025-01-27.050797

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

1943 (21)

Unit

Source

[1]

Radar Summary

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

Radar

Value

Unit

Source

First Observation

Value

2015-11-29

Unit

Source

[3]

Last Observation

Value

2024-12-30

Unit

Source

[3]

Delay (Discarded)

Value

17 (3)

Unit

Source

[1]

Doppler (Discarded)

Value

8 (0)

Unit

Source

[1]

Total Radar Observations (Discarded)

Value

25 (3)

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

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 163899 2003SD220 from 1950 to 2126

Body	Date in UTC	Time uncert. in min	Nominal distance in au	Min. possible distance in au
EARTH	1960-12-22 14:11	< 1 s	0.1784551	0.1784550
EARTH	1963-12-24 16:32	< 1 s	0.0868607	0.0868606
EARTH	1966-12-22 10:07	< 1 s	0.0206241	0.0206241
EARTH	1969-12-17 03:23	< 1 s	0.0409625	0.0409625
EARTH	1972-12-01 03:35	< 1 s	0.0919274	0.0919273
EARTH	1975-11-11 05:11	< 1 s	0.1396219	0.1396218
EARTH	2012-12-23 04:01	< 1 s	0.1536129	0.1536129
EARTH	2015-12-24 13:06	< 1 s	0.0729679	0.0729679
EARTH	2018-12-22 01:03	< 1 s	0.0189013	0.0189013
EARTH	2021-12-17 17:25	< 1 s	0.0362815	0.0362814
EARTH	2024-12-02 12:35	< 1 s	0.0883391	0.0883391
EARTH	2027-11-12 18:15	< 1 s	0.1381884	0.1381884
EARTH	2064-12-23 15:37	< 1 s	0.1249952	0.1249951
EARTH	2067-12-24 02:49	< 1 s	0.0484716	0.0484716
EARTH	2070-12-20 23:47	< 1 s	0.0181644	0.0181644
EARTH	2073-12-12 13:48	< 1 s	0.0585487	0.0585486
EARTH	2076-11-23 08:06	< 1 s	0.1109679	0.1109679
EARTH	2079-11-08 05:35	< 1 s	0.1639567	0.1639567
EARTH	2113-12-24 04:10	< 1 s	0.1659475	0.1659474
EARTH	2116-12-24 15:42	< 1 s	0.0779905	0.0779904
EARTH	2119-12-23 02:36	< 1 s	0.0182712	0.0182711
EARTH	2122-12-19 06:30	< 1 s	0.0308278	0.0308277
EARTH	2125-12-08 05:48	< 1 s	0.0760944	0.0760943

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
215.00431991	348.20271556	0.01788011	MINIMUM
357.02149028	134.87667995	0.36561375	SADDLE
2.73402951	322.07955650	1.64069785	SADDLE
184.06445313	143.50564081	2.01413974	MAXIMUM

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MOID Plots

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