Asteroids

153591 2001SN263 help

Last update: 2026-08-20 13:15 UTC

Orbital Properties

Epoch

61200.0

MJD

Orbit type

Amor

Perihelion (q)

1.034

Aphelion (Q)

2.942

Eccentricity (e)

0.480

Inclination (i)

6.7

deg

Orbit period (P)

1023.6

Earth MOID

0.04779

U parameter

0.0

Next Earth close approach

Date

2036-03-06

Nominal distance (from Earth center)

0.14622

21874763

Maximum Brightness

15.2

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

mag

Diameter

2500

Taxonomic type

Rotation period (T)

3.430

Discovery Information

Discovery Date

2001-09-20

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

1.987726

1-sigma variation

4.353E-10

Unit

Eccentricity (e)

Value

0.480007

1-sigma variation

5.691E-9

Unit

Inclination (i)

Value

6.6930

1-sigma variation

1.820E-6

Unit

Long. of Ascending Node (Ω)

Value

325.7075

1-sigma variation

5.853E-6

Unit

Arg. of Perihelion (ω)

Value

173.0687

1-sigma variation

6.525E-6

Unit

Mean Anomaly (M)

Value

194.39579

1-sigma variation

1.244E-6

Unit

Perihelion distance

Value

1.033604

1-sigma variation

Unit

Aphelion distance

Value

2.941848

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

1.909565

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.048528

1-sigma variation

Unit

MOID

Value

0.047792

1-sigma variation

Unit

Orbit Period

Value

1023.6068

1-sigma variation

Unit

U parameter

Value

0.0

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	1.89448E-19	1.26258E-18	-2.29146E-16	2.79564E-16	1.78086E-16	-2.56260E-16
e	1.26258E-18	3.23878E-17	-1.02970E-15	1.76748E-15	-2.10954E-15	-1.16042E-15
i	-2.29146E-16	-1.02970E-15	3.31262E-12	2.39366E-12	-3.09267E-12	3.31312E-13
Ω	2.79564E-16	1.76748E-15	2.39366E-12	3.42561E-11	-3.18994E-11	-9.81802E-13
ω	1.78086E-16	-2.10954E-15	-3.09267E-12	-3.18994E-11	4.25722E-11	-3.37288E-12
M	-2.56260E-16	-1.16042E-15	3.31312E-13	-9.81802E-13	-3.37288E-12	1.54646E-12

Date of computation: 2026-08-20 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

3.430

Unit

Source

[5]

Quality

Value

3,B,R

Unit

Source

[5]

Amplitude

Value

0.1

Unit

mag

Source

[5]

Rotation Direction

Value

Unit

Source

[-]

Spinvector L

Value

309

Unit

Source

[1]

Spinvector B

Value

-80

Unit

Source

[1]

Taxonomy
Taxonomy (all)

Taxonomy

Value

Unit

Source

Taxonomy

Value

Unit

Source

[2]

[3]

Taxonomy (all)

Value

Unit

Source

[4]

[3]

Absolute Magnitude (H)
Slope Parameter (G)

H / G

Value

Unit

Source

Absolute Magnitude (H)

Value

17.036

Unit

mag

Source

[6]

Slope Parameter (G)

Value

0.15**

Unit

Source

[6]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

0.24

Unit

Source

[8]

Diameter

Value

2500

Unit

Source

[7]

Color Index Information

Color Index Information

Value

Unit

Source

Color Index Information

Value

0.3427

0.4269

0.0842

Unit

g-r

g-i

r-i

Source

[2]

Sightings

Sightings

Value

Unit

Source

Sightings

Value

Radar R

Visual S

Unit

Source

[9]

[10]

Satellites

Satellites

Value

Unit

Source

Satellites

Value

Binary Child 1

Binary Child 2

Unit

Source

[4]

Download this part as:

Sources

No.	Name	Additional
[1]	EARN	1.) Becker, T.M. et al. (2015) Icarus 248, 499-515. (Physical modeling of triple near-Earth asteroid (153591) 2001 SN 263 from radar and optical light curve observations)
[2]	EARN	1.) A. V. Sergeyev, B. Carry et al A&A, 658 (2022) A109
[3]	EARN	1.) Perna, D. et al. (2014) Astron. Astrophys. 568, L6. (The triple near-Earth asteroid (153591) 2001 SN263: an ultra-blue, primitive target for the Aster space mission)
[4]	EARN	Earth Asteroids Research Node: https://earn.dlr.de
[5]	EARN	1.) Becker, T.M. et al. (2015) Icarus 248, 499-515. (Physical modeling of triple near-Earth asteroid (153591) 2001 SN 263 from radar and optical light curve observations) 2.) Oey, J. (2009) MPB 36, 4-6. (LIGHTCURVE ANALYSIS OF ASTEROIDS FROM LEURA AND KINGSGROVE OBSERVATORIES IN THE FIRST HALF OF 2008) (..,153591,..) 3.) Nolan, M.C. et al. (2008) I.A.U. Circ. HREF="http://www.cbat.eps.harvard.edu/iauc/08900/08921.html"> 8921. ((153591) 2001 SN_263) (Radar detection of a triple system) 4.) Betzler, A.S. et al. (2008) MPB 35, 182-184. (A STUDY OF THE TRINARY NEA 2001 SN263) 5.) Pravec, P. et al (2016) Icarus 267,267-295. (Binary asteroid population. 3. Secondary rotations and elongations) (..,..)
[6]	ESA Aegis	ESA orbit determination and impact monitoring system
[7]	EARN	1.) Becker, T.M. et al. (2015) Icarus 248, 499-515. (Physical modeling of triple near-Earth asteroid (153591) 2001 SN 263 from radar and optical light curve observations) 2.) Nolan, M.C. et al. (2008) I.A.U. Circ. HREF="http://www.cbat.eps.harvard.edu/iauc/08900/08921.html"> 8921. ((153591) 2001 SN_263) (Radar detection of a triple system) 3.) Delbo, M. et al. (2011) Icarus 212, 138-148. (The cool surfaces of binary near-Earth asteroids) (5381,153591, 164121)
[8]	EARN	1.) Delbo, M. et al. (2011) Icarus 212, 138-148. (The cool surfaces of binary near-Earth asteroids) (5381,153591, 164121)
[9]	EARN	1.) href="http://echo.jpl.nasa.gov/asteroids/index.html">JPL's NEO Radar Detection Program Webpage 2.) Nolan, M.C. et al. (2008) I.A.U. Circ. HREF="http://www.cbat.eps.harvard.edu/iauc/08900/08921.html"> 8921. ((153591) 2001 SN_263) (Radar detection of a triple system)
[10]	EARN	1.) Reddy, V. et al. (2008) ACM2008, 8244. (Physical Characterization of First Triplet Near-Earth Asteroid (153591) 2001 SN263) 2.) Ostrowski, D.R. et al. (2011) Icarus 212, 682-696. (IRTF spectra for 17 asteroids from the C and X complexes: A discussion of continuum slopes and their relationships to C chondrites and phyllosilicates) (..,3691,7753,153591) 3.) Perna, D. et al. (2014) Astron. Astrophys. 568, L6. (The triple near-Earth asteroid (153591) 2001 SN263: an ultra-blue, primitive target for the Aster space mission)

Observational Information

Arc Length
Unobserved
Normalized RMS of residuals

Arc Information

Value

Unit

Source

Arc Length

Value

13105

Unit

Source

[1]

Unobserved

Value

Unit

Source

[1]

Normalized RMS of residuals

Value

0.407085

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

1990-09-25.30278

Unit

Source

[2]

Last Observation

Value

2026-08-12.50331

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

3712 (43)

Unit

Source

[1]

Radar Summary

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

Radar

Value

Unit

Source

First Observation

Value

2008-02-12

Unit

Source

[3]

Last Observation

Value

2022-02-23

Unit

Source

[3]

Delay (Discarded)

Value

3 (0)

Unit

Source

[1]

Doppler (Discarded)

Value

0 (0)

Unit

Source

[-]

Total Radar Observations (Discarded)

Value

3 (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

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Close Approaches for 153591 2001SN263 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	1994-03-06 04:18	< 1 s	0.1455716	0.1455714	0.0000001
EARTH	2008-02-20 10:56	< 1 s	0.0658773	0.0658773	0.0000000
EARTH	2022-02-28 16:17	< 1 s	0.1008959	0.1008959	0.0000000
EARTH	2036-03-06 06:44	< 1 s	0.1462238	0.1462237	0.0000000
EARTH	2109-01-27 10:58	< 1 s	0.1007835	0.1007833	0.0000001
EARTH	2123-02-15 08:02	< 1 s	0.0497487	0.0497487	0.0000000

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
2.45624257	37.96853899	0.04779201	MINIMUM
180.25275403	214.75091750	1.92814156	SADDLE
0.91950418	215.41253673	2.04736554	SADDLE
180.37344557	34.81721617	3.92819117	MAXIMUM

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MOID Plots

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