Asteroids

154276 2002SY50 help

Last update: 2026-06-17 13:02 UTC

Orbital Properties

Epoch

61200.0

MJD

Orbit type

Apollo

Perihelion (q)

0.530

Aphelion (Q)

2.880

Eccentricity (e)

0.689

Inclination (i)

8.7

deg

Orbit period (P)

813.4

Earth MOID

0.00392

U parameter

0.0

Next Earth close approach

Date

2051-10-28

Nominal distance (from Earth center)

0.02525

3777750

Maximum Brightness

12.3

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

17.7

mag

Diameter

1060

Taxonomic type

Rotation period (T)

4.823

Discovery Information

Discovery Date

2002-09-30

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

1.705289

1-sigma variation

5.214E-9

Unit

Eccentricity (e)

Value

0.688944

1-sigma variation

8.876E-9

Unit

Inclination (i)

Value

8.7406

1-sigma variation

3.004E-6

Unit

Long. of Ascending Node (Ω)

Value

34.0017

1-sigma variation

9.238E-6

Unit

Arg. of Perihelion (ω)

Value

99.7265

1-sigma variation

8.675E-6

Unit

Mean Anomaly (M)

Value

193.66900

1-sigma variation

2.216E-6

Unit

Perihelion distance

Value

0.530440

1-sigma variation

Unit

Aphelion distance

Value

2.880138

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.019864

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.203229

1-sigma variation

Unit

MOID

Value

0.003918

1-sigma variation

Unit

Orbit Period

Value

813.3836

1-sigma variation

Unit

U parameter

Value

0.0

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	2.71857E-17	-6.71913E-18	1.42250E-16	6.05311E-15	-6.32237E-15	-5.57719E-15
e	-6.71913E-18	7.87774E-17	1.22858E-15	6.02225E-14	-4.97497E-14	-1.24415E-14
i	1.42250E-16	1.22858E-15	9.02375E-12	-5.70111E-12	6.46462E-12	-1.36143E-13
Ω	6.05311E-15	6.02225E-14	-5.70111E-12	8.53457E-11	-7.92423E-11	-6.38499E-12
ω	-6.32237E-15	-4.97497E-14	6.46462E-12	-7.92423E-11	7.52551E-11	4.04158E-12
M	-5.57719E-15	-1.24415E-14	-1.36143E-13	-6.38499E-12	4.04158E-12	4.91152E-12

Date of computation: 2026-06-17 13:02 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

4.823

Unit

Source

[5]

Quality

Value

Unit

Source

[5]

Amplitude

Value

0.52

Unit

mag

Source

[5]

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

[1]

[2]

Taxonomy (all)

Value

Q;S/Sr

Unit

Source

[3]

[4]

Absolute Magnitude (H)
Slope Parameter (G)

H / G

Value

Unit

Source

Absolute Magnitude (H)

Value

17.676

17.01

Unit

mag

Source

[6]

[1]

Slope Parameter (G)

Value

0.15**

Unit

Source

[6]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

0.14

Unit

Source

[7]

Diameter

Value

1060

Unit

Source

[7]

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

Unit

Source

[8]

Download this part as:

Sources

No.	Name	Additional
[1]	EARN	1.) Tubiana, C. et al. (2015) Astron. Astrophys. 584, A97. (2P/Encke, the Taurid complex NEOs and the Maribo and Sutter's Mill meteorites) (10 NEOs)
[2]	EARN	1.) Alexey V. Sergeyev and Benoit Carry A&A, 652 (2021) A59
[3]	EARN	1.) Tubiana, C. et al. (2015) Astron. Astrophys. 584, A97. (2P/Encke, the Taurid complex NEOs and the Maribo and Sutter's Mill meteorites) (10 NEOs) 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)
[4]	EARN	Earth Asteroids Research Node: https://earn.dlr.de
[5]	EARN	1.) Masi, G. (2002) href="http://www.bellatrixobservatory.org/2002sy50lc.gif"> (composite LC of 2002 SY50)
[6]	ESA Aegis	ESA orbit determination and impact monitoring system
[7]	EARN	1.) Nugent, C.R. et al. (2015) Astrophys. J. 814_117 (13pp) (NEOWISE Reactivation Mission Year One: Preliminary Asteroid Diameters and Albedos)(201 NEOs)
[8]	EARN	1.) href="http://echo.jpl.nasa.gov/asteroids/index.html">JPL's NEO Radar Detection Program Webpage

Observational Information

Arc Length
Unobserved
Normalized RMS of residuals

Arc Information

Value

Unit

Source

Arc Length

Value

8344

Unit

Source

[1]

Unobserved

Value

370

Unit

Source

[1]

Normalized RMS of residuals

Value

0.451955

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2002-08-25.44521

Unit

Source

[2]

Last Observation

Value

2025-06-29.845261

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

1207 (27)

Unit

Source

[1]

Radar Summary

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

Radar

Value

Unit

Source

First Observation

Value

2002-10-28

Unit

Source

[3]

Last Observation

Value

2002-11-05

Unit

Source

[3]

Delay (Discarded)

Value

5 (0)

Unit

Source

[1]

Doppler (Discarded)

Value

2 (0)

Unit

Source

[1]

Total Radar Observations (Discarded)

Value

7 (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

Filters

Initial Date: *

Final Date: *

Normalised Only accepted

Max residual (arcsec):

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Computation parameters

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Initial Date: *

Final Date: *

Output option:

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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 154276 2002SY50 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	1953-11-04 04:04	< 1 min	0.1207126	0.1207118	0.0000003
EARTH	1956-05-02 09:32	< 1 min	0.1644031	0.1644021	0.0000003
EARTH	1976-05-17 18:54	< 1 min	0.1086303	0.1086287	0.0000006
EARTH	1982-10-19 02:23	< 1 min	0.1970571	0.1970556	0.0000005
EARTH	2002-11-02 13:24	< 1 s	0.0836232	0.0836232	0.0000000
EARTH	2005-04-30 12:50	< 1 s	0.1937990	0.1937988	0.0000001
VENUS	2014-03-07 18:10	< 1 min	0.0258415	0.0258405	0.0000003
EARTH	2025-05-15 18:34	< 1 s	0.0704620	0.0704619	0.0000000
EARTH	2051-10-28 08:37	< 1 min	0.0252527	0.0252509	0.0000006
EARTH	2071-10-30 01:37	< 1 min	0.0087698	0.0087651	0.0000016
EARTH	2094-05-11 11:30	14.2	0.0675338	0.0672301	0.0001017
EARTH	2114-05-22 03:03	17.2	0.1456449	0.1449804	0.0002216
VENUS	2118-10-12 06:26	23.0	0.0494504	0.0486725	0.0002597
EARTH	2120-10-21 14:41	11.7	0.1786771	0.1781375	0.0001799

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
307.21459377	291.90128753	0.00391759	MINIMUM
53.08443860	127.02062610	0.04940463	MINIMUM
0.39583691	29.48183470	0.46793326	SADDLE
0.80231165	210.38810216	1.54111915	SADDLE
180.04545170	209.62053689	1.88307972	SADDLE
180.23197576	29.69704477	3.85749166	MAXIMUM

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MOID Plots

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