Asteroids

2026RA4 help

Last update: 2026-09-16 13:00 UTC

Orbital Properties

Epoch

61200.0

MJD

Orbit type

Apollo

Perihelion (q)

0.743

Aphelion (Q)

1.814

Eccentricity (e)

0.419

Inclination (i)

4.5

deg

Orbit period (P)

527.9

Earth MOID

0.00242

U parameter

7.1

Next Earth close approach

Date

2042-09-13

Nominal distance (from Earth center)

0.02941

4399604

Maximum Brightness

21.7

mag

Risk

Object is in risk list

Physical Properties

Absolute Magnitude (H)

26.2

mag

Diameter

15 - 30*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2026-09-09

Observatory

University of Arizona Mt. Lemmon Survey

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

1.278348

1-sigma variation

0.000265

Unit

Eccentricity (e)

Value

0.419093

1-sigma variation

0.000182

Unit

Inclination (i)

Value

4.4861

1-sigma variation

0.0019

Unit

Long. of Ascending Node (Ω)

Value

174.1525

1-sigma variation

0.0002

Unit

Arg. of Perihelion (ω)

Value

261.7405

1-sigma variation

0.0004

Unit

Mean Anomaly (M)

Value

253.65298

1-sigma variation

0.03887

Unit

Perihelion distance

Value

0.742601

1-sigma variation

Unit

Aphelion distance

Value

1.814095

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.127371

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.011878

1-sigma variation

Unit

MOID

Value

0.002417

1-sigma variation

Unit

Orbit Period

Value

527.9248

1-sigma variation

Unit

U parameter

Value

7.1

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	7.04892E-8	4.84010E-8	5.04657E-7	-5.39791E-8	-9.57253E-8	1.03208E-5
e	4.84010E-8	3.32359E-8	3.46533E-7	-3.70402E-8	-6.54968E-8	7.08669E-6
i	5.04657E-7	3.46533E-7	3.61340E-6	-3.86529E-7	-6.83288E-7	7.38900E-5
Ω	-5.39791E-8	-3.70402E-8	-3.86529E-7	4.20301E-8	7.66036E-8	-7.90392E-6
ω	-9.57253E-8	-6.54968E-8	-6.83288E-7	7.66036E-8	1.64732E-7	-1.40201E-5
M	1.03208E-5	7.08669E-6	7.38900E-5	-7.90392E-6	-1.40201E-5	1.51114E-3

Date of computation: 2026-09-16 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

26.244

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

0.547599

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2026-09-09.263243

Unit

Source

[2]

Last Observation

Value

2026-09-15.187419

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

52 (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 2026RA4 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	1956-02-01 22:21	> 1 d	0.1676542	0.1476651	0.0071221
EARTH	1958-09-17 06:29	> 1 w	0.0294984	0.0040419	0.3714066
EARTH	1969-02-20 19:46	> 1 w	0.0698532	0.0230240	0.2955366
EARTH	1971-10-05 11:03	> 1 mo	0.1495827	0.0170769	0.2065714
VENUS	1977-08-22 04:33	> 1 w	0.0479701	0.0479627	0.0009432
EARTH	1982-02-26 19:26	> 1 d	0.0254830	0.0233813	0.0121601
VENUS	2002-03-31 03:37	437.6	0.0492882	0.0491625	0.0000885
EARTH	2013-09-12 01:04	> 1 d	0.0519672	0.0026911	0.0241458
EARTH	2024-01-24 00:32	> 1 d	0.1898973	0.1789222	0.0036584
EARTH	2026-09-16 07:39	< 1 s	0.0086053	0.0085939	0.0000038
EARTH	2042-09-13 19:41	> 1 d	0.0294095	0.0022639	0.0278844
EARTH	2053-03-01 20:37	> 1 d	0.0677651	0.0223963	0.0837117
EARTH	2069-02-18 14:01	> 1 w	0.0931706	0.0208117	0.2672735
EARTH	2071-10-16 23:40	> 1 mo	0.1788121	0.0288386	0.2188082
EARTH	2087-09-16 04:44	> 1 w	0.0039537	0.0011461	0.3777983
EARTH	2095-03-04 18:31	> 1 mo	0.0690765	0.0193000	53.5302144
EARTH	2097-09-29 16:20	> 1 mo	0.1260058	0.0068467	58.8163006
EARTH	2120-09-05 21:44	> 1 mo	0.1957529	0.0040321	41.0035414

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
300.59387573	248.94086583	0.00241652	MINIMUM
57.96132240	52.54118353	0.02242795	MINIMUM
359.13998000	330.73969760	0.25178290	SADDLE
179.58352615	150.93885022	0.80620733	SADDLE
358.66071651	150.02107008	1.75601083	SADDLE
179.41112983	330.83487778	2.79772747	MAXIMUM

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MOID Plots

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

Level lines of the squared distance function

2026RA4

Date in UTC	MJD	σ	Distance ± Width in RE	Stretching in RE	IP	Impact energy	PS	TS
2106-09-17.679	90519.679	-0.558	1.18 ± 0.000	1.56E5	3.26E-6	3.47E-1	-6.24	0
2109-09-17.462	91615.462	-0.619	0.23 ± 0.008	1.93E6	4.61E-7	3.47E-1	-7.11	0
2112-09-17.098	92711.098	-4.473	1.24 ± 0.002	3.25E5	1.46E-10	3.44E-1	-10.62	0
2113-09-17.419	93076.419	-0.630	0.68 ± 0.000	7.09E6	1.11E-7	3.46E-1	-7.75	0
2119-09-17.981	95267.981	-0.654	1.25 ± 0.004	3.83E5	1.08E-6	3.46E-1	-6.79	0
2122-09-17.358	96363.358	0.880	0.35 ± 0.000	1.07E8	6.72E-9	3.46E-1	-9.00	0
2122-09-17.551	96363.551	-0.475	0.98 ± 0.045	6.66E6	1.03E-7	3.47E-1	-7.81	0
2123-09-17.953	96728.953	2.134	1.22 ± 0.000	2.65E6	1.92E-8	3.48E-1	-8.55	0
2126-09-17.517	97824.517	0.735	0.51 ± 0.000	4.67E6	1.66E-7	3.47E-1	-7.62	0
2126-09-17.601	97824.601	1.031	0.91 ± 0.000	1.02E7	4.73E-8	3.47E-1	-8.17	n/a
2126-09-17.627	97824.627	0.687	1.17 ± 0.000	7.12E5	6.34E-7	3.47E-1	-7.05	n/a


Based on 52 optical observations (of which 0 are rejected as outliers) from 2026/09/09.263 to 2026/09/15.187.
Coordinates are given on the Target Plane.
Unit is one Earth radius, but impact cross section has radius between 1.37 and 1.37 Earth radii.
Coordinates for LOV = EQU scaled= 1 second= F.
Aegis software version= 5.0, Date of computation=20260916 134110.377 UTC.

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