Asteroids

2026FB4 help

Last update: 2026-03-25 13:01 UTC

Orbital Properties

Epoch

61200.0

MJD

Orbit type

Apollo

Perihelion (q)

0.865

Aphelion (Q)

2.079

Eccentricity (e)

0.412

Inclination (i)

0.3

deg

Orbit period (P)

652.3

Earth MOID

0.00170

U parameter

7.1

Next Earth close approach

Date

2042-07-10

Nominal distance (from Earth center)

0.08749

13088361

Maximum Brightness

28.1

mag

Risk

Object is in risk list

Physical Properties

Absolute Magnitude (H)

27.9

mag

Diameter

7 - 15*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2026-03-23

Observatory

MAPS, San Pedro de Atacama

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

1.471990

1-sigma variation

0.000378

Unit

Eccentricity (e)

Value

0.412088

1-sigma variation

0.000179

Unit

Inclination (i)

Value

0.2758

1-sigma variation

0.0002

Unit

Long. of Ascending Node (Ω)

Value

323.7167

1-sigma variation

0.0261

Unit

Arg. of Perihelion (ω)

Value

279.3757

1-sigma variation

0.0258

Unit

Mean Anomaly (M)

Value

16.98625

1-sigma variation

0.00421

Unit

Perihelion distance

Value

0.865401

1-sigma variation

Unit

Aphelion distance

Value

2.078579

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.132175

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.322813

1-sigma variation

Unit

MOID

Value

0.001705

1-sigma variation

Unit

Orbit Period

Value

652.3128

1-sigma variation

Unit

U parameter

Value

7.1

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	1.42603E-7	6.76533E-8	8.95486E-8	9.55432E-6	-9.43684E-6	-1.59094E-6
e	6.76533E-8	3.20968E-8	4.24560E-8	4.52838E-6	-4.47240E-6	-7.54830E-7
i	8.95486E-8	4.24560E-8	5.77210E-8	6.23978E-6	-6.17264E-6	-9.97470E-7
Ω	9.55432E-6	4.52838E-6	6.23978E-6	6.78945E-4	-6.72132E-4	-1.06341E-4
ω	-9.43684E-6	-4.47240E-6	-6.17264E-6	-6.72132E-4	6.65480E-4	1.05014E-4
M	-1.59094E-6	-7.54830E-7	-9.97470E-7	-1.06341E-4	1.05014E-4	1.77532E-5

Date of computation: 2026-03-25 13:01 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

27.932

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

7 - 15*

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

0.493321

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2026-03-19.297555

Unit

Source

[2]

Last Observation

Value

2026-03-25.221375

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

43 (1)

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

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 2026FB4 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	1950-04-12 01:36	> 1 d	0.0860106	0.0453095	0.0135724
EARTH	1959-07-14 09:59	> 1 w	0.0654066	0.0043573	0.0381559
EARTH	1979-03-20 14:53	> 1 d	0.0711504	0.0030918	0.0265979
EARTH	1988-05-06 22:49	> 1 d	0.1352502	0.1261776	0.0030242
MARS	1988-08-31 20:41	456.2	0.0421641	0.0407601	0.0026133
EARTH	1997-07-15 12:23	> 1 w	0.0599841	0.0042133	0.0419031
EARTH	2006-08-06 22:09	> 1 d	0.1587722	0.0332579	0.0418914
EARTH	2026-03-26 20:47	< 1 min	0.0043436	0.0043387	0.0000017
EARTH	2042-07-10 13:12	> 1 w	0.0874903	0.0043690	0.0277661
EARTH	2051-03-24 20:14	> 1 d	0.0272553	0.0032962	0.0440321
EARTH	2058-08-08 15:35	> 1 w	0.1537984	0.0012165	0.1598101
EARTH	2067-04-09 10:00	> 1 mo	0.0751374	0.0032213	0.3041760
EARTH	2083-05-29 07:47	> 1 mo	0.1484888	0.1250538	0.0078363
EARTH	2099-07-17 10:49	> 1 mo	0.0662989	0.0013833	0.1792386
EARTH	2108-03-16 05:55	> 1 d	0.1556451	0.0825092	0.0243840
EARTH	2115-07-31 06:59	> 1 w	0.0194325	0.0014526	0.2072236
EARTH	2124-04-26 06:08	> 1 mo	0.1163093	0.0032797	0.9677625

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
41.24735677	199.51101049	0.00170455	MINIMUM
321.45616767	80.83865846	0.00328597	MINIMUM
1.57111618	140.41414120	0.14747230	SADDLE
180.65231987	319.40781741	1.09107364	SADDLE
1.53598177	320.37721618	1.85283174	SADDLE
180.66944928	139.42632622	3.09128084	MAXIMUM

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MOID Plots

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

Level lines of the squared distance function

2026FB4

Date in UTC	MJD	σ	Distance ± Width in RE	Stretching in RE	IP	Impact energy	PS	TS
2088-07-27.783	83894.783	0.545	1.08 ± 0.016	8.55E5	8.05E-7	2.93E-2	-7.60	0
2096-07-25.756	86814.756	0.811	1.04 ± 0.014	2.02E4	3.10E-5	2.94E-2	-6.06	0
2098-07-25.464	87544.464	0.886	0.87 ± 0.015	1.49E6	4.90E-7	2.93E-2	-7.88	0
2101-07-26.977	88640.977	0.812	1.19 ± 0.013	5.88E7	8.78E-9	2.93E-2	-9.64	0
2109-07-27.000	91563.000	0.808	0.47 ± 0.013	1.19E7	6.80E-8	2.93E-2	-8.80	0
2118-07-29.261	94852.261	0.526	0.26 ± 0.016	1.49E7	6.76E-8	2.93E-2	-8.84	0
2118-07-29.617	94852.617	0.544	1.03 ± 0.016	1.20E7	6.33E-8	2.93E-2	-8.87	0
2121-07-26.893	95945.893	0.818	0.94 ± 0.014	7.32E6	9.41E-8	2.93E-2	-8.71	0
2121-07-27.014	95946.014	0.818	1.46 ± 0.014	3.50E6	6.02E-8	2.93E-2	-8.91	0
2124-07-29.646	97044.646	-0.226	1.42 ± 0.013	1.04E7	2.90E-8	2.92E-2	-9.24	0
2126-07-27.431	97772.431	0.815	1.05 ± 0.014	2.31E7	2.63E-8	2.94E-2	-9.29	n/a
2126-07-28.210	97773.210	0.161	1.43 ± 0.021	1.64E8	2.26E-9	2.93E-2	-10.35	n/a


Based on 43 optical observations (of which 1 are rejected as outliers) from 2026/03/19.298 to 2026/03/25.221.
Coordinates are given on the Target Plane.
Unit is one Earth radius, but impact cross section has radius between 1.47 and 1.47 Earth radii.
Coordinates for LOV = EQU scaled= 1 second= F.
Aegis software version= 5.0, Date of computation=20260325 135919.027 UTC.

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