Asteroids

2026RO39 help

Last update: 2026-09-16 06:45 UTC

Orbital Properties

Epoch

61200.0

MJD

Orbit type

Apollo

Perihelion (q)

0.825

Aphelion (Q)

1.750

Eccentricity (e)

0.359

Inclination (i)

3.4

deg

Orbit period (P)

533.8

Earth MOID

0.00146

U parameter

6.6

Next Earth close approach

Date

2029-04-10

Nominal distance (from Earth center)

0.087

13015056

Maximum Brightness

26.9

mag

Risk

Object is in risk list

Physical Properties

Absolute Magnitude (H)

29.4

mag

Diameter

4 - 8*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2026-09-15

Observatory

TransAstra TKO at e-EYE

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

1.287788

1-sigma variation

0.000120

Unit

Eccentricity (e)

Value

0.359203

1-sigma variation

0.000088

Unit

Inclination (i)

Value

3.4258

1-sigma variation

0.0011

Unit

Long. of Ascending Node (Ω)

Value

172.6673

1-sigma variation

0.0001

Unit

Arg. of Perihelion (ω)

Value

107.1857

1-sigma variation

0.0008

Unit

Mean Anomaly (M)

Value

330.51613

1-sigma variation

0.00216

Unit

Perihelion distance

Value

0.825210

1-sigma variation

Unit

Aphelion distance

Value

1.750365

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.260782

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.008075

1-sigma variation

Unit

MOID

Value

0.001459

1-sigma variation

Unit

Orbit Period

Value

533.7831

1-sigma variation

Unit

U parameter

Value

6.6

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	1.44372E-8	1.05296E-8	1.33535E-7	-1.76847E-8	-7.74677E-8	2.59082E-7
e	1.05296E-8	7.68389E-9	9.78128E-8	-1.29302E-8	-5.74191E-8	1.89223E-7
i	1.33535E-7	9.78128E-8	1.28390E-6	-1.67156E-7	-8.08762E-7	2.42354E-6
Ω	-1.76847E-8	-1.29302E-8	-1.67156E-7	2.19454E-8	1.01870E-7	-3.19405E-7
ω	-7.74677E-8	-5.74191E-8	-8.08762E-7	1.01870E-7	6.15529E-7	-1.44774E-6
M	2.59082E-7	1.89223E-7	2.42354E-6	-3.19405E-7	-1.44774E-6	4.66601E-6

Date of computation: 2026-09-16 06:45 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

29.358

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

4 - 8*

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

[-]

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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

0.801665

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2026-09-15.022266

Unit

Source

[2]

Last Observation

Value

2026-09-16.238842

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

27 (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 2026RO39 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	1956-09-03 07:08	> 1 mo	0.0835721	0.0000193	0.3811835
EARTH	1959-04-25 07:49	> 1 mo	0.0794855	0.0334593	0.2330344
EARTH	1972-09-17 13:07	> 1 mo	0.0561001	0.0021782	0.5372806
EARTH	1975-06-09 13:05	> 1 mo	0.1863605	0.0448358	0.1269013
EARTH	1991-08-11 01:45	> 1 mo	0.1552403	0.0249715	0.0672068
EARTH	1994-04-17 20:54	> 1 d	0.0344825	0.0344570	0.0019631
EARTH	2007-09-17 02:06	> 1 d	0.0337603	0.0016099	0.0156593
EARTH	2010-06-10 21:01	> 1 d	0.1871995	0.1771901	0.0033439
EARTH	2026-09-14 07:43	< 1 min	0.0017010	0.0016998	0.0000004
EARTH	2029-04-10 10:47	222.0	0.0870003	0.0796377	0.0024813
EARTH	2039-05-29 22:30	> 1 d	0.1782716	0.1659485	0.0041137
EARTH	2049-08-04 10:00	> 1 d	0.1706886	0.1490626	0.0072377
EARTH	2059-09-19 09:02	> 1 d	0.0633552	0.0069107	0.0188235
EARTH	2062-04-15 03:22	1313.4	0.0408710	0.0383838	0.0047040
EARTH	2072-06-09 17:48	> 1 d	0.1931723	0.1826312	0.0035241
EARTH	2082-08-11 20:14	> 1 d	0.1569829	0.1355022	0.0071806
EARTH	2092-09-19 11:07	728.9	0.0707266	0.0439523	0.0089248
EARTH	2095-04-15 16:29	467.1	0.0411743	0.0385711	0.0020172
EARTH	2105-06-07 05:41	764.9	0.1881838	0.1866224	0.0005209
EARTH	2115-08-04 22:00	> 1 d	0.1731832	0.1692644	0.0013070
EARTH	2125-09-18 11:34	763.2	0.0323919	0.0121259	0.0067564

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
52.58599679	247.80784301	0.00145945	MINIMUM
307.13631389	102.66649703	0.03507240	MINIMUM
359.51644773	174.66285268	0.19860434	SADDLE
179.91862809	355.46422776	0.77045483	SADDLE
0.14480339	355.60140876	1.80803709	SADDLE
180.16524706	175.63358714	2.76611457	MAXIMUM

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MOID Plots

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

Level lines of the squared distance function

2026RO39

Date in UTC	MJD	σ	Distance ± Width in RE	Stretching in RE	IP	Impact energy	PS
2108-09-15.446	91248.446	-2.577	1.46 ± 0.003	1.32E5	1.09E-7	4.08E-3	-9.26
2115-09-16.326	93805.326	-2.777	1.18 ± 0.000	1.11E8	1.99E-10	4.07E-3	-12.04
2116-09-15.591	94170.591	-4.104	0.78 ± 0.003	3.18E5	6.91E-10	4.08E-3	-11.50
2118-09-16.054	94901.054	-4.217	0.46 ± 0.027	2.83E6	5.45E-11	4.07E-3	-12.62
2118-09-16.115	94901.115	-2.468	1.11 ± 0.002	2.55E4	1.44E-6	4.08E-3	-8.20
2120-09-15.562	95631.562	-3.059	0.89 ± 0.000	6.48E5	1.67E-8	4.07E-3	-10.14
2121-09-15.825	95996.825	-2.720	0.67 ± 0.002	1.59E4	1.72E-6	4.08E-3	-8.13
2122-09-16.081	96362.081	-3.195	0.79 ± 0.003	4.13E5	1.46E-8	4.08E-3	-10.21
2126-09-16.043	97823.043	-3.092	0.35 ± 0.003	5.28E5	1.81E-8	4.07E-3	-10.13
2126-09-16.079	97823.079	-3.853	0.69 ± 0.001	5.35E4	1.23E-8	4.07E-3	-10.30
2126-09-16.097	97823.097	-3.087	1.36 ± 0.045	4.32E6	2.31E-9	4.07E-3	-11.02
2126-09-16.109	97823.109	-4.093	1.28 ± 0.001	6.47E4	2.13E-9	4.07E-3	-11.06
2126-09-16.170	97823.170	-3.829	1.23 ± 0.001	2.15E5	1.98E-9	4.07E-3	-11.09


Based on 27 optical observations (of which 0 are rejected as outliers) from 2026/09/15.022 to 2026/09/16.239.
Coordinates are given on the Target Plane.
Unit is one Earth radius, but impact cross section has radius between 1.48 and 1.48 Earth radii.
Coordinates for LOV = EQU scaled= 1 second= F.
Aegis software version= 5.0, Date of computation=20260916 094906.945 UTC.

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