Asteroids

505657 2014SR339 help

Last update: 2026-08-15 13:16 UTC

Orbital Properties

Epoch

61200.0

MJD

Orbit type

Apollo

Perihelion (q)

0.905

Aphelion (Q)

1.694

Eccentricity (e)

0.304

Inclination (i)

29.8

deg

Orbit period (P)

541.1

Earth MOID

0.03566

U parameter

0.0

Next Earth close approach

Date

2058-02-05

Nominal distance (from Earth center)

0.04235

6334989

Maximum Brightness

12.9

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

18.4

mag

Diameter

780

Taxonomic type

Rotation period (T)

8.729

Discovery Information

Discovery Date

2014-09-30

Observatory

WISE

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

1.299453

1-sigma variation

2.426E-9

Unit

Eccentricity (e)

Value

0.303773

1-sigma variation

1.179E-8

Unit

Inclination (i)

Value

29.7962

1-sigma variation

3.595E-6

Unit

Long. of Ascending Node (Ω)

Value

138.7349

1-sigma variation

1.361E-6

Unit

Arg. of Perihelion (ω)

Value

299.6539

1-sigma variation

4.726E-6

Unit

Mean Anomaly (M)

Value

256.38612

1-sigma variation

0.00001

Unit

Perihelion distance

Value

0.904715

1-sigma variation

Unit

Aphelion distance

Value

1.694191

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.039104

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.374330

1-sigma variation

Unit

MOID

Value

0.035656

1-sigma variation

Unit

Orbit Period

Value

541.0523

1-sigma variation

Unit

U parameter

Value

0.0

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	5.88635E-18	-1.24397E-17	-2.73964E-15	-1.50849E-16	5.68392E-15	-1.66280E-14
e	-1.24397E-17	1.38977E-16	3.39023E-15	-4.91239E-15	-2.48406E-14	3.64006E-14
i	-2.73964E-15	3.39023E-15	1.29254E-11	-9.50020E-14	-5.06562E-12	1.00785E-11
Ω	-1.50849E-16	-4.91239E-15	-9.50020E-14	1.85352E-12	-4.27727E-12	2.88238E-12
ω	5.68392E-15	-2.48406E-14	-5.06562E-12	-4.27727E-12	2.23316E-11	-2.47471E-11
M	-1.66280E-14	3.64006E-14	1.00785E-11	2.88238E-12	-2.47471E-11	5.18187E-11

Date of computation: 2026-08-15 13:16 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

8.729

Unit

Source

[3]

Quality

Value

Unit

Source

[3]

Amplitude

Value

0.93

Unit

mag

Source

[3]

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

18.414

Unit

mag

Source

[4]

Slope Parameter (G)

Value

0.15**

Unit

Source

[4]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

0.088

0.07

Unit

Source

[5]

[6]

[7]

Diameter

Value

780

Unit

Source

[5]

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.) Michaël Marsset et al 2022 AJ 163 165
[2]	EARN	Earth Asteroids Research Node: https://earn.dlr.de
[3]	EARN	1.) Warner, B.D. (2018) MPB 45, 248-256. (Near-Earth Asteroid Lightcurve Analysis at CS3-Palmer Divide Station: 2018 January-April)(28 NEOs) 2.) Franco, L. et al. (2018) MPB 45, 399-400. (Lightcurves for 91 Aegina, 235 Carolina, 1117 Reginita, and (505657) 2014 SR339)
[4]	ESA Aegis	ESA orbit determination and impact monitoring system
[5]	EARN	1.) Joseph R. Masiero et al 2021 Planet. Sci. J. 2 162
[6]	EARN	1.) Joseph R. Masiero et al 2020 Planet. Sci. J. 1 5
[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

4337

Unit

Source

[1]

Unobserved

Value

Unit

Source

[1]

Normalized RMS of residuals

Value

0.46354

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2014-09-30.55814

Unit

Source

[2]

Last Observation

Value

2026-08-15.141712

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

1643 (4)

Unit

Source

[1]

Radar Summary

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

Radar

Value

Unit

Source

First Observation

Value

2018-02-05

Unit

Source

[3]

Last Observation

Value

2018-02-09

Unit

Source

[3]

Delay (Discarded)

Value

5 (0)

Unit

Source

[1]

Doppler (Discarded)

Value

1 (0)

Unit

Source

[1]

Total Radar Observations (Discarded)

Value

6 (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):

* - these fields are required

Plot

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 505657 2014SR339 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
MARS	1979-02-22 21:58	< 1 min	0.0315473	0.0315460	0.0000004
EARTH	1981-02-05 06:22	< 1 min	0.0425661	0.0425651	0.0000003
EARTH	2018-02-07 23:16	< 1 s	0.0539384	0.0539384	0.0000000
EARTH	2021-01-30 11:45	< 1 s	0.1943476	0.1943474	0.0000001
MARS	2048-09-26 06:53	< 1 s	0.0216376	0.0216372	0.0000001
EARTH	2058-02-05 16:40	< 1 min	0.0423468	0.0423454	0.0000005
EARTH	2095-02-08 06:43	< 1 min	0.0510918	0.0510839	0.0000026
EARTH	2098-01-30 19:53	< 1 min	0.1977945	0.1977835	0.0000036
MARS	2118-05-01 18:04	< 1 min	0.0226847	0.0226800	0.0000016

Download as:

Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
44.65975846	32.38376998	0.03565623	MINIMUM
277.22723169	231.56781309	0.30080915	MINIMUM
336.08568910	302.24134525	0.49815290	SADDLE
161.54342142	142.34258672	0.92073381	SADDLE
350.11573344	143.51431062	1.86499143	SADDLE
188.26384187	343.78534111	2.62083139	MAXIMUM

Download:

MOID Plots

Click on the images to zoom-in and zoom-out