Asteroids

2025OB help

Last update: 2026-10-14 13:25 UTC

Orbital Properties

Epoch

61400.0

MJD

Orbit type

Aten

Perihelion (q)

0.381

Aphelion (Q)

1.182

Eccentricity (e)

0.512

Inclination (i)

14.4

deg

Orbit period (P)

252.4

Earth MOID

0.00003

U parameter

6.0

Next Earth close approach

Date

2034-07-18

Nominal distance (from Earth center)

0.07867

11768883

Maximum Brightness

25.1

mag

Risk

Object is in risk list

Physical Properties

Absolute Magnitude (H)

26.3

mag

Diameter

14 - 30*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2025-07-16

Observatory

ATLAS Chile, Rio Hurtado

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

61400.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

0.781616

1-sigma variation

0.000013

Unit

Eccentricity (e)

Value

0.512057

1-sigma variation

0.000136

Unit

Inclination (i)

Value

14.4368

1-sigma variation

0.0069

Unit

Long. of Ascending Node (Ω)

Value

295.7175

1-sigma variation

0.0002

Unit

Arg. of Perihelion (ω)

Value

147.4636

1-sigma variation

0.0005

Unit

Mean Anomaly (M)

Value

286.91615

1-sigma variation

0.03577

Unit

Perihelion distance

Value

0.381384

1-sigma variation

Unit

Aphelion distance

Value

1.181847

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.000064

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.580876

1-sigma variation

Unit

MOID

Value

0.000027

1-sigma variation

Unit

Orbit Period

Value

252.3994

1-sigma variation

Unit

U parameter

Value

6.0

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	1.77784E-10	-1.79733E-9	-9.05558E-8	2.65632E-9	-5.66282E-9	-4.75044E-7
e	-1.79733E-9	1.86113E-8	9.39990E-7	-2.75385E-8	5.20484E-8	4.86942E-6
i	-9.05558E-8	9.39990E-7	4.74885E-5	-1.39108E-6	2.59546E-6	2.45686E-4
Ω	2.65632E-9	-2.75385E-8	-1.39108E-6	4.07642E-8	-7.65457E-8	-7.20158E-6
ω	-5.66282E-9	5.20484E-8	2.59546E-6	-7.65457E-8	2.41711E-7	1.43422E-5
M	-4.75044E-7	4.86942E-6	2.45686E-4	-7.20158E-6	1.43422E-5	1.27948E-3

Date of computation: 2026-10-14 13:25 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

26.323

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

14 - 30*

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

478

Unit

Source

[1]

Normalized RMS of residuals

Value

0.755826

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2025-07-16.238075

Unit

Source

[2]

Last Observation

Value

2025-07-19.028141

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

22 (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 2025OB 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	1958-07-09 17:12	> 1 d	0.1433699	0.0301980	0.0432879
EARTH	1965-07-16 02:38	1392.2	0.1400428	0.0314925	0.0362104
EARTH	1974-07-18 08:38	19.6	0.0027661	0.0018058	0.0017318
EARTH	1985-07-09 23:34	72.2	0.1385291	0.1371586	0.0004569
EARTH	1994-07-18 10:30	25.1	0.0363271	0.0272551	0.0030244
EARTH	2005-07-15 11:03	188.1	0.0836909	0.0776429	0.0020162
EARTH	2014-07-16 23:25	47.3	0.1281930	0.1239404	0.0014175
EARTH	2016-07-02 00:19	191.2	0.1815353	0.1796922	0.0006148
EARTH	2025-07-18 05:43	< 1 s	0.0083534	0.0083443	0.0000030
EARTH	2034-07-18 02:13	32.0	0.0786701	0.0749277	0.0012475
EARTH	2043-07-15 18:05	99.6	0.1834945	0.1767108	0.0022613
EARTH	2045-07-05 11:26	447.0	0.1675685	0.1634291	0.0013817
EARTH	2054-07-15 05:17	292.0	0.0934891	0.0858449	0.0025488
EARTH	2063-07-18 21:04	52.9	0.0092881	0.0000109	0.0031398
EARTH	2072-07-17 12:12	> 1 d	0.0409859	0.0010509	0.0361520
EARTH	2081-07-14 22:56	> 1 d	0.0956781	0.0083292	0.0461504
EARTH	2090-07-09 03:18	> 1 d	0.1495931	0.0375266	0.0417158
EARTH	2097-07-15 12:23	> 1 d	0.1824174	0.0046328	0.0663386
EARTH	2099-07-01 07:19	> 1 w	0.1904709	0.1073996	0.0311196
EARTH	2106-07-18 17:31	> 1 d	0.1112206	0.0030623	0.0670286
EARTH	2115-07-20 02:33	753.7	0.0458990	0.0016061	0.0594683
EARTH	2124-07-19 11:41	131.6	0.0050378	0.0011746	0.0159843

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
234.13400270	191.34037680	0.00085515	MINIMUM
131.77157218	130.31279822	0.22912019	MINIMUM
159.45366799	147.48441132	0.23679305	SADDLE
352.61206802	328.04724857	0.61138817	SADDLE
355.92902196	153.65935479	1.39383505	SADDLE
180.78395170	339.76811986	2.16160333	MAXIMUM

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MOID Plots

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

Level lines of the squared distance function

2025OB

Date in UTC	MJD	σ	Distance ± Width in RE	Stretching in RE	IP	Impact energy	PS
2063-07-18.959	74753.959	-4.081	1.12 ± 0.000	5.84E1	1.98E-6	3.85E-1	-6.08
2065-07-18.440	75484.440	-4.347	1.14 ± 0.000	3.11E4	1.27E-9	3.85E-1	-9.30
2066-07-18.691	75849.691	-3.958	0.39 ± 0.001	2.61E5	1.47E-9	3.85E-1	-9.24


Based on 22 optical observations (of which 0 are rejected as outliers) from 2025/07/16.238 to 2025/07/19.028.
Coordinates are given on the Target Plane.
Unit is one Earth radius, but impact cross section has radius between 1.27 and 1.27 Earth radii.
Coordinates for LOV = EQU scaled= 1 second= F.
Aegis software version= 5.0, Date of computation=20261106 095205.176 UTC.

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