Asteroids

251346 2007SJ help

Last update: 2025-09-10 00:30 UTC

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Apollo

Perihelion (q)

0.940

Aphelion (Q)

3.089

Eccentricity (e)

0.533

Inclination (i)

8.2

deg

Orbit period (P)

1044.6

Earth MOID

0.04226

U parameter

0.0

Next Earth close approach

Date

2034-02-25

Nominal distance (from Earth center)

0.08205

12273933

Maximum Brightness

14.5

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

16.8

mag

Diameter

1100 - 2600*

Taxonomic type

Rotation period (T)

2.718

Discovery Information

Discovery Date

2007-09-17

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

2.014811

1-sigma variation

1.419E-8

Unit

Eccentricity (e)

Value

0.533236

1-sigma variation

9.059E-9

Unit

Inclination (i)

Value

8.1820

1-sigma variation

3.476E-6

Unit

Long. of Ascending Node (Ω)

Value

306.7571

1-sigma variation

1.792E-5

Unit

Arg. of Perihelion (ω)

Value

175.2498

1-sigma variation

1.954E-5

Unit

Mean Anomaly (M)

Value

48.92570

1-sigma variation

0.00002

Unit

Perihelion distance

Value

0.940442

1-sigma variation

Unit

Aphelion distance

Value

3.089180

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

2.060601

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.043596

1-sigma variation

Unit

MOID

Value

0.042257

1-sigma variation

Unit

Orbit Period

Value

1044.5997

1-sigma variation

Unit

U parameter

Value

0.0

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	2.01425E-16	6.08344E-17	2.00946E-15	-3.62576E-14	6.38569E-14	-2.29055E-13
e	6.08344E-17	8.20617E-17	5.80441E-15	-1.38731E-13	1.54969E-13	-7.10754E-14
i	2.00946E-15	5.80441E-15	1.20812E-11	-2.54364E-11	2.66467E-11	-2.82441E-12
Ω	-3.62576E-14	-1.38731E-13	-2.54364E-11	3.21250E-10	-3.41146E-10	4.85116E-11
ω	6.38569E-14	1.54969E-13	2.66467E-11	-3.41146E-10	3.81966E-10	-8.58376E-11
M	-2.29055E-13	-7.10754E-14	-2.82441E-12	4.85116E-11	-8.58376E-11	2.62879E-10

Date of computation: 2025-09-10 00:30 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

2.718

Unit

Source

[5]

Quality

Value

3,B,U

Unit

Source

[5]

Amplitude

Value

0.14-0.2

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]

[3]

Taxonomy (all)

Value

S,K

Unit

Source

[4]

[2]

[4]

Absolute Magnitude (H)
Slope Parameter (G)

H / G

Value

Unit

Source

Absolute Magnitude (H)

Value

16.826

17.16

Unit

mag

Source

[6]

[2]

Slope Parameter (G)

Value

0.15**

0.31

Unit

mag

Source

[6]

[2]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

0.05 - 0.25

Unit

Source

[7]

Diameter

Value

1100 - 2600*

Unit

Source

[7]

Color Index Information

Color Index Information

Value

Unit

Source

Color Index Information

Value

0.4273

0.35

0.48

0.81

Unit

g-r

R-I

V-R

B-V

Source

[1]

[2]

Sightings

Sightings

Value

Unit

Source

Sightings

Value

Radar R

Unit

Source

[8]

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Sources

No.	Name	Additional
[1]	EARN	1.) A. V. Sergeyev, B. Carry et al A&A, 658 (2022) A109
[2]	EARN	1.) Hicks, M. & S. Ebelhar (2014) href="http://www.astronomerstelegram.org/?read=5801"> ATel#5801 (Broadband Photometry of the Potentially Hazardous Asteroid 251346 (2007 SJ))
[3]	EARN	1.) Alexey V. Sergeyev and Benoit Carry A&A, 652 (2021) A59
[4]	EARN	Earth Asteroids Research Node: https://earn.dlr.de
[5]	EARN	1.) Warner, B.D. (2014) MPB 41,113-124. (NEAR-EARTH ASTEROID LIGHTCURVE ANALYSIS AT CS3-PALMER DIVIDE STATION: 2013 SEPTEMBER-DECEMBER)(LCs of 36 NEAs) 2.) Hicks, M. & S. Ebelhar (2014) href="http://www.astronomerstelegram.org/?read=5801"> ATel#5801 (Broadband Photometry of the Potentially Hazardous Asteroid 251346 (2007 SJ)) 3.) Carbognani, A. (2014) MPB 41, 265-270. (ASTEROIDS LIGHTCURVES AT OAVDA: 2013 DECEMBER - 2014 JUNE) (21374, 53435,143649,242708,243566,251346,2013XY8,2014CU13) 4.) Gorshanov, D. et al. (2015) MPB 42, 246-247. (PHOTOMETRY OF THREE ASTEROIDS WITH THE ZA-320M TELESCOPE OF PULKOVO OBSERVATORY)(..,251346)
[6]	ESA Aegis	ESA orbit determination and impact monitoring system
[7]	Estimation	Estimated from absolute magnitude
[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

12496

Unit

Source

[1]

Unobserved

Value

301

Unit

Source

[1]

Normalized RMS of residuals

Value

0.399257

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

1990-10-14.20139

Unit

Source

[2]

Last Observation

Value

2024-12-30.112163

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

1037 (1)

Unit

Source

[1]

Radar Summary

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

Radar

Value

Unit

Source

First Observation

Value

2014-01-18

Unit

Source

[3]

Last Observation

Value

2014-01-19

Unit

Source

[3]

Delay (Discarded)

Value

2 (0)

Unit

Source

[1]

Doppler (Discarded)

Value

0 (0)

Unit

Source

[-]

Total Radar Observations (Discarded)

Value

2 (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

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 251346 2007SJ 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	1954-01-06 10:13	2.7	0.0604464	0.0604390	0.0000025
EARTH	1974-02-03 19:35	< 1 min	0.0475508	0.0475505	0.0000001
EARTH	1994-01-23 01:00	< 1 min	0.0520166	0.0520162	0.0000001
EARTH	2014-01-21 15:38	< 1 s	0.0486281	0.0486280	0.0000000
EARTH	2034-02-25 00:15	< 1 min	0.0820462	0.0820436	0.0000009
EARTH	2117-01-25 00:40	< 1 min	0.0443678	0.0443677	0.0000000

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
6.51821873	30.98013827	0.04212399	MINIMUM
0.48665999	200.33861671	1.95566103	SADDLE
180.09085083	199.97142103	2.07391158	SADDLE
180.19659012	20.02626160	4.07367751	MAXIMUM

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MOID Plots

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