Asteroids

2026RB4 help

Last update: 2026-09-13 13:00 UTC

Orbital Properties

Epoch

61200.0

MJD

Orbit type

Aten

Perihelion (q)

0.453

Aphelion (Q)

1.085

Eccentricity (e)

0.412

Inclination (i)

7.8

deg

Orbit period (P)

246.3

Earth MOID

0.00670

U parameter

6.5

Next Earth close approach

Date

2028-09-06

Nominal distance (from Earth center)

0.08929

13357119

Maximum Brightness

25.1

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

26.3

mag

Diameter

15 - 30*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2026-09-09

Observatory

TransAstra at Springbrook

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

0.769007

1-sigma variation

0.000031

Unit

Eccentricity (e)

Value

0.411533

1-sigma variation

0.000093

Unit

Inclination (i)

Value

7.8091

1-sigma variation

0.0027

Unit

Long. of Ascending Node (Ω)

Value

348.2536

1-sigma variation

1.453E-5

Unit

Arg. of Perihelion (ω)

Value

204.0262

1-sigma variation

0.0003

Unit

Mean Anomaly (M)

Value

351.64144

1-sigma variation

0.01620

Unit

Perihelion distance

Value

0.452535

1-sigma variation

Unit

Aphelion distance

Value

1.085478

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.016113

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.528328

1-sigma variation

Unit

MOID

Value

0.006702

1-sigma variation

Unit

Orbit Period

Value

246.3165

1-sigma variation

Unit

U parameter

Value

6.5

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	9.71298E-10	-2.89416E-9	-8.35252E-8	4.29506E-10	6.29848E-9	5.04591E-7
e	-2.89416E-9	8.62818E-9	2.48980E-7	-1.28680E-9	-1.83528E-8	-1.50471E-6
i	-8.35252E-8	2.48980E-7	7.18570E-6	-3.71273E-8	-5.32340E-7	-4.34181E-5
Ω	4.29506E-10	-1.28680E-9	-3.71273E-8	2.11033E-10	2.12315E-9	2.25000E-7
ω	6.29848E-9	-1.83528E-8	-5.32340E-7	2.12315E-9	7.93150E-8	3.16161E-6
M	5.04591E-7	-1.50471E-6	-4.34181E-5	2.25000E-7	3.16161E-6	2.62453E-4

Date of computation: 2026-09-13 13:00 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

26.272

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

15 - 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

Unit

Source

[1]

Normalized RMS of residuals

Value

0.745505

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2026-09-09.740136

Unit

Source

[2]

Last Observation

Value

2026-09-13.251736

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

76 (8)

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 2026RB4 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	1964-11-04 21:55	102.4	0.1536985	0.1532288	0.0001637
EARTH	1966-10-27 10:29	298.1	0.1064603	0.1060034	0.0001996
EARTH	1968-09-29 19:06	> 1 d	0.0991956	0.0950938	0.0014082
EARTH	1970-09-09 08:26	804.3	0.0143100	0.0085151	0.0054203
EARTH	1972-09-06 01:50	99.7	0.1118341	0.0899161	0.0073166
EARTH	1991-11-05 10:59	39.2	0.1533446	0.1464660	0.0023586
EARTH	1993-10-29 06:44	716.8	0.1062325	0.1061891	0.0000950
EARTH	1995-10-06 18:59	> 1 d	0.1062058	0.1040380	0.0007691
EARTH	1997-09-14 00:30	1194.0	0.0506360	0.0375975	0.0043957
EARTH	1999-09-06 20:13	98.0	0.0589876	0.0394571	0.0065512
EARTH	2001-09-07 22:03	225.3	0.1891663	0.1693558	0.0066055
EARTH	2020-11-04 01:09	96.0	0.1217262	0.1191716	0.0008938
EARTH	2022-10-21 03:44	374.4	0.1092191	0.1088938	0.0001173
EARTH	2024-09-26 04:18	210.4	0.0924065	0.0916811	0.0002422
EARTH	2026-09-09 08:55	< 1 s	0.0124531	0.0124431	0.0000033
EARTH	2028-09-06 01:26	< 1 min	0.0892868	0.0873220	0.0006550
EARTH	2051-11-05 06:43	45.2	0.1636365	0.1511776	0.0043051
EARTH	2053-11-01 21:05	590.2	0.1097332	0.1074345	0.0011197
EARTH	2055-10-18 06:04	> 1 d	0.1095305	0.1094790	0.0000870
EARTH	2057-09-27 07:10	> 1 d	0.0938003	0.0872447	0.0022189
EARTH	2059-09-11 20:18	816.6	0.0321264	0.0189027	0.0045000
EARTH	2061-09-06 12:27	75.1	0.0565393	0.0444597	0.0040367
EARTH	2063-09-07 21:28	54.6	0.1607714	0.1540438	0.0022428
EARTH	2086-11-05 03:57	89.4	0.1557704	0.1244298	0.0124290
EARTH	2088-11-01 06:22	> 1 d	0.1090291	0.1074818	0.0026837
EARTH	2090-10-17 21:30	> 1 d	0.1099081	0.1097321	0.0005433
VENUS	2091-11-14 14:33	928.6	0.0424453	0.0422853	0.0022887
EARTH	2092-09-28 00:48	> 1 d	0.0956730	0.0759058	0.0071699
EARTH	2094-09-12 21:21	> 1 d	0.0409488	0.0078813	0.0195618
EARTH	2096-09-06 15:14	826.4	0.0403057	0.0060730	0.0254971
EARTH	2098-09-07 08:54	526.7	0.1413751	0.0766276	0.0216292
EARTH	2121-11-06 03:29	202.4	0.1547472	0.1113349	0.0394687
EARTH	2123-11-02 18:40	> 1 d	0.1088956	0.1078721	0.0072924
EARTH	2125-10-17 05:52	> 1 w	0.1107515	0.1107431	0.0002491

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
139.78381390	242.13779195	0.00670179	MINIMUM
216.06175914	292.21273098	0.10632868	MINIMUM
195.86280518	278.78812163	0.10974977	SADDLE
6.69243893	95.87604616	0.54980982	SADDLE
5.37282836	273.84416865	1.45171541	SADDLE
181.50540572	89.52426055	2.08428005	MAXIMUM

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MOID Plots

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