Asteroids

2026OG4 help

Last update: 2026-08-05 07:00 UTC

Orbital Properties

Epoch

61200.0

MJD

Orbit type

Apollo

Perihelion (q)

0.752

Aphelion (Q)

2.057

Eccentricity (e)

0.465

Inclination (i)

33.3

deg

Orbit period (P)

608.0

Earth MOID

0.00558

U parameter

8.6

Next Earth close approach

Date

2031-07-20

Nominal distance (from Earth center)

0.11275

16867526

Maximum Brightness

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

25.6

mag

Diameter

21 - 50*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2026-07-23

Observatory

JPL SynTrack Robotic Telescope, Auberry

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

1.404532

1-sigma variation

0.003134

Unit

Eccentricity (e)

Value

0.464708

1-sigma variation

0.001192

Unit

Inclination (i)

Value

33.2695

1-sigma variation

0.0577

Unit

Long. of Ascending Node (Ω)

Value

122.2544

1-sigma variation

0.0020

Unit

Arg. of Perihelion (ω)

Value

260.5347

1-sigma variation

0.0836

Unit

Mean Anomaly (M)

Value

300.47622

1-sigma variation

0.24705

Unit

Perihelion distance

Value

0.751835

1-sigma variation

Unit

Aphelion distance

Value

2.057229

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.208035

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.007038

1-sigma variation

Unit

MOID

Value

0.005577

1-sigma variation

Unit

Orbit Period

Value

607.9893

1-sigma variation

Unit

U parameter

Value

8.6

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	9.81997E-6	3.73685E-6	1.80753E-4	6.38595E-6	-2.61943E-4	7.74164E-4
e	3.73685E-6	1.42201E-6	6.87832E-5	2.43007E-6	-9.96784E-5	2.94597E-4
i	1.80753E-4	6.87832E-5	3.32709E-3	1.17543E-4	-4.82148E-3	1.42498E-2
Ω	6.38595E-6	2.43007E-6	1.17543E-4	4.15285E-6	-1.70344E-4	5.03441E-4
ω	-2.61943E-4	-9.96784E-5	-4.82148E-3	-1.70344E-4	6.98728E-3	-2.06505E-2
M	7.74164E-4	2.94597E-4	1.42498E-2	5.03441E-4	-2.06505E-2	6.10318E-2

Date of computation: 2026-08-05 07:00 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

[-]

Taxonomy (all)

Value

Unit

Source

[-]

Absolute Magnitude (H)
Slope Parameter (G)

H / G

Value

Unit

Source

Absolute Magnitude (H)

Value

25.555

Unit

mag

Source

[1]

Slope Parameter (G)

Value

0.15**

Unit

Source

[1]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

0.05 - 0.25

Unit

Source

[2]

Diameter

Value

21 - 50*

Unit

Source

[2]

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]	ESA Aegis	ESA orbit determination and impact monitoring system
[2]	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

Unit

Source

[1]

Normalized RMS of residuals

Value

0.77904

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2026-07-20.54546

Unit

Source

[2]

Last Observation

Value

2026-07-24.483762

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

20 (2)

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 2026OG4 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	1972-01-16 17:24	> 1 w	0.1718306	0.1502719	0.3377513
EARTH	1977-01-13 14:14	> 1 w	0.1506373	0.1500006	0.0550874
EARTH	1982-01-12 01:51	> 1 w	0.1848585	0.1498598	0.3102310
EARTH	2016-07-30 05:04	1083.5	0.1071466	0.0570556	0.0167016
EARTH	2021-07-26 13:45	> 1 d	0.0221229	0.0055230	0.0987025
EARTH	2026-07-25 01:01	< 1 s	0.0189002	0.0187909	0.0000365
EARTH	2031-07-20 23:16	> 1 d	0.1127524	0.0034938	0.1008841
EARTH	2075-01-15 22:55	> 1 w	0.1561800	0.1463541	0.2480393
EARTH	2080-01-13 19:18	> 1 w	0.1539107	0.1463481	0.2371231
EARTH	2114-08-01 01:37	> 1 mo	0.1153802	0.0046125	1.1003959
EARTH	2119-07-28 00:24	> 1 mo	0.0206145	0.0076343	0.9285673
EARTH	2124-07-25 01:16	> 1 mo	0.0306869	0.0074587	0.8074977

Download as:

Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
306.05130392	198.43730016	0.00557669	MINIMUM
61.52454315	9.02718719	0.14997212	MINIMUM
4.52100631	286.91139461	0.55131315	SADDLE
183.48500585	98.52325181	1.33159999	SADDLE
0.64289861	99.33047923	1.68424210	SADDLE
176.36224813	273.43200848	2.94775076	MAXIMUM

Download:

MOID Plots

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