Asteroids

2015SA help

Last update: 2026-06-04 23:11 UTC

Orbital Properties

Epoch

61200.0

MJD

Orbit type

Aten

Perihelion (q)

0.630

Aphelion (Q)

1.052

Eccentricity (e)

0.251

Inclination (i)

13.2

deg

Orbit period (P)

281.7

Earth MOID

0.00490

U parameter

6.9

Next Earth close approach

Date

2035-09-13

Nominal distance (from Earth center)

0.17801

26630400

Maximum Brightness

24.8

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

25.2

mag

Diameter

24 - 50*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2015-09-16

Observatory

SONEAR Observatory, Oliveira

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

0.840931

1-sigma variation

0.000064

Unit

Eccentricity (e)

Value

0.251223

1-sigma variation

0.000044

Unit

Inclination (i)

Value

13.1982

1-sigma variation

0.0066

Unit

Long. of Ascending Node (Ω)

Value

352.0053

1-sigma variation

0.0013

Unit

Arg. of Perihelion (ω)

Value

208.0102

1-sigma variation

0.0173

Unit

Mean Anomaly (M)

Value

114.82084

1-sigma variation

0.14437

Unit

Perihelion distance

Value

0.629670

1-sigma variation

Unit

Aphelion distance

Value

1.052192

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.006095

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.348740

1-sigma variation

Unit

MOID

Value

0.004898

1-sigma variation

Unit

Orbit Period

Value

281.6691

1-sigma variation

Unit

U parameter

Value

6.9

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	4.15490E-9	-2.81047E-9	4.28094E-7	-8.15525E-8	1.11213E-6	9.30578E-6
e	-2.81047E-9	1.90118E-9	-2.89558E-7	5.51649E-8	-7.52246E-7	-6.29469E-6
i	4.28094E-7	-2.89558E-7	4.41103E-5	-8.40252E-6	1.14590E-4	9.58804E-4
Ω	-8.15525E-8	5.51649E-8	-8.40252E-6	1.60075E-6	-2.18287E-5	-1.82655E-4
ω	1.11213E-6	-7.52246E-7	1.14590E-4	-2.18287E-5	2.97687E-4	2.49085E-3
M	9.30578E-6	-6.29469E-6	9.58804E-4	-1.82655E-4	2.49085E-3	2.08423E-2

Date of computation: 2026-06-04 23:11 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

Unit

Source

[-]

Quality

Value

Unit

Source

[-]

Amplitude

Value

Unit

mag

Source

[-]

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]

Taxonomy (all)

Value

Unit

Source

[2]

Absolute Magnitude (H)
Slope Parameter (G)

H / G

Value

Unit

Source

Absolute Magnitude (H)

Value

25.191

Unit

mag

Source

[3]

Slope Parameter (G)

Value

0.15**

Unit

Source

[3]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

0.05 - 0.25

Unit

Source

[4]

Diameter

Value

24 - 50*

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.) Maxime Devogèle et al 2019 AJ 158 196
[2]	EARN	Earth Asteroids Research Node: https://earn.dlr.de
[3]	ESA Aegis	ESA orbit determination and impact monitoring system
[4]	Estimation	Estimated from absolute magnitude

Observational Information

Arc Length
Unobserved
Normalized RMS of residuals

Arc Information

Value

Unit

Source

Arc Length

Value

Unit

Source

[1]

Unobserved

Value

3889

Unit

Source

[1]

Normalized RMS of residuals

Value

0.320114

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2015-09-16.08076

Unit

Source

[2]

Last Observation

Value

2015-10-15.231972

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

177 (0)

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

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 2015SA 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	1960-09-13 10:53	> 1 d	0.1986949	0.0185003	0.1393927
VENUS	1964-04-03 18:52	> 1 w	0.0491135	0.0412281	0.0685812
EARTH	1967-09-12 23:47	506.3	0.0790157	0.0097158	0.0659998
EARTH	1974-09-15 13:32	> 1 d	0.0185209	0.0061435	0.0236994
EARTH	1981-10-10 22:19	> 1 d	0.1592912	0.1313799	0.0099705
VENUS	1985-03-08 10:17	> 1 d	0.0425914	0.0413226	0.0027978
EARTH	1991-09-13 07:11	48.7	0.1501078	0.1402611	0.0032835
EARTH	1998-09-16 01:11	361.6	0.0257665	0.0162022	0.0032609
EARTH	2005-10-26 00:32	498.5	0.1965145	0.1927108	0.0012919
EARTH	2015-09-15 00:50	< 1 s	0.0074727	0.0074655	0.0000024
EARTH	2025-09-13 02:54	110.1	0.0260852	0.0190785	0.0023607
EARTH	2035-09-13 12:47	97.1	0.1780132	0.1656868	0.0041101
EARTH	2042-09-28 16:27	> 1 d	0.1155679	0.0981652	0.0059020
EARTH	2052-09-12 14:56	404.4	0.0339182	0.0064671	0.0110151
EARTH	2059-10-20 23:04	1166.1	0.1860221	0.1771579	0.0030583
VENUS	2060-11-05 21:55	> 1 d	0.0431124	0.0431088	0.0001212
EARTH	2069-09-16 04:53	> 1 d	0.0325338	0.0067118	0.0330888
EARTH	2079-09-12 18:25	146.2	0.1222910	0.1053385	0.0056573
EARTH	2086-10-06 21:20	> 1 d	0.1472168	0.0931916	0.0215305
EARTH	2096-09-13 13:51	> 1 d	0.0069586	0.0047609	0.0455781
VENUS	2100-03-25 02:16	1426.7	0.0427402	0.0346588	0.0153341
EARTH	2103-09-25 11:18	> 1 w	0.0964790	0.0236419	0.1082902
EARTH	2110-10-17 17:15	> 1 mo	0.1790468	0.1214615	0.1719990
VENUS	2118-01-22 12:01	> 1 mo	0.0431350	0.0399526	0.1945861

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
143.34693915	250.92821308	0.00487874	MINIMUM
21.73766384	124.58634639	0.39691795	SADDLE
9.25380957	288.41937457	1.62321341	SADDLE
181.13773313	99.89565982	2.05255953	MAXIMUM

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MOID Plots

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