Asteroids

2012EG5 help

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

Orbital Properties

Epoch

61200.0

MJD

Orbit type

Apollo

Perihelion (q)

0.980

Aphelion (Q)

3.312

Eccentricity (e)

0.543

Inclination (i)

3.0

deg

Orbit period (P)

1148.5

Earth MOID

0.00193

U parameter

5.2

Next Earth close approach

Date

2034-05-27

Nominal distance (from Earth center)

0.07552

11298238

Maximum Brightness

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

24.2

mag

Diameter

40 - 80*

Taxonomic type

Rotation period (T)

0.2924

Discovery Information

Discovery Date

2012-03-13

Observatory

Pan-STARRS 1, Haleakala

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

2.146312

1-sigma variation

0.000039

Unit

Eccentricity (e)

Value

0.543225

1-sigma variation

0.000006

Unit

Inclination (i)

Value

3.0444

1-sigma variation

1.467E-5

Unit

Long. of Ascending Node (Ω)

Value

192.8562

1-sigma variation

4.421E-5

Unit

Arg. of Perihelion (ω)

Value

16.4302

1-sigma variation

0.0002

Unit

Mean Anomaly (M)

Value

176.77535

1-sigma variation

0.04202

Unit

Perihelion distance

Value

0.980382

1-sigma variation

Unit

Aphelion distance

Value

3.312241

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.004875

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

2.159439

1-sigma variation

Unit

MOID

Value

0.001931

1-sigma variation

Unit

Orbit Period

Value

1148.5175

1-sigma variation

Unit

U parameter

Value

5.2

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	1.49480E-9	2.26654E-10	5.54160E-10	-1.70050E-9	7.88662E-9	-1.62449E-6
e	2.26654E-10	3.43674E-11	8.40358E-11	-2.57859E-10	1.19595E-9	-2.46319E-7
i	5.54160E-10	8.40358E-11	2.15118E-10	-6.36900E-10	2.93785E-9	-6.02244E-7
Ω	-1.70050E-9	-2.57859E-10	-6.36900E-10	1.95441E-9	-9.00013E-9	1.84804E-6
ω	7.88662E-9	1.19595E-9	2.93785E-9	-9.00013E-9	4.17342E-8	-8.57094E-6
M	-1.62449E-6	-2.46319E-7	-6.02244E-7	1.84804E-6	-8.57094E-6	1.76544E-3

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

0.2924

Unit

Source

[2]

Quality

Value

Unit

Source

[2]

Amplitude

Value

0.42

Unit

mag

Source

[2]

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

[1]

Absolute Magnitude (H)
Slope Parameter (G)

H / G

Value

Unit

Source

Absolute Magnitude (H)

Value

23.97

24.233

Unit

mag

Source

[1]

[3]

Slope Parameter (G)

Value

0.05

0.15**

Unit

Source

[1]

[3]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

0.05 - 0.25

Unit

Source

[4]

Diameter

Value

40 - 80*

Unit

Source

[4]

Color Index Information

Color Index Information

Value

Unit

Source

Color Index Information

Value

0.37

0.39

0.78

Unit

V-R

R-I

B-V

Source

[1]

Sightings

Sightings

Value

Unit

Source

Sightings

Value

Unit

Source

[-]

Download this part as:

Sources

No.	Name	Additional
[1]	EARN	1.) Hicks, M. et al. (2011) href="http://www.astronomerstelegram.org/?read=4016"> ATel#4016 (Optical photometry of 2012 EG5: Constraints on taxonomy and spin rate)
[2]	EARN	1.) Franco, L. et al. (2012) MPB 39, 153. (LIGHTCURVE PHOTOMETRY OF NEA 2012 EG5) 2.) Hicks, M. et al. (2011) href="http://www.astronomerstelegram.org/?read=4016"> ATel#4016 (Optical photometry of 2012 EG5: Constraints on taxonomy and spin rate)
[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

5198

Unit

Source

[1]

Normalized RMS of residuals

Value

0.332692

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2012-03-13.30201

Unit

Source

[2]

Last Observation

Value

2012-04-03.778528

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

493 (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

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 2012EG5 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	1959-03-21 16:26	1435.5	0.0429461	0.0281453	0.0049391
EARTH	2012-04-01 09:32	< 1 s	0.0015398	0.0015398	0.0000000
EARTH	2034-05-27 14:58	672.7	0.0755241	0.0677016	0.0026575
EARTH	2053-03-16 15:17	236.7	0.0896266	0.0855263	0.0013669
EARTH	2075-05-31 15:51	696.0	0.0920412	0.0820424	0.0033799
EARTH	2116-06-05 23:37	252.7	0.1468972	0.1413895	0.0018390

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
349.73485142	88.25459515	0.00232149	MINIMUM
8.75661616	123.13092442	0.03266628	MINIMUM
6.56214224	119.10228619	0.03272837	SADDLE
1.49989682	289.77668407	1.97586317	SADDLE
180.46549528	288.50506343	2.31716865	SADDLE
180.42504604	108.48622365	4.31835781	MAXIMUM

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MOID Plots

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