Asteroids

2026UA1 help

Last update: 2026-10-27 13:17 UTC

Orbital Properties

Epoch

61400.0

MJD

Orbit type

Apollo

Perihelion (q)

0.781

Aphelion (Q)

1.522

Eccentricity (e)

0.322

Inclination (i)

5.3

deg

Orbit period (P)

451.2

Earth MOID

0.00154

U parameter

6.3

Next Earth close approach

Date

2038-04-10

Nominal distance (from Earth center)

0.02744

4104497

Maximum Brightness

23.1

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

28.1

mag

Diameter

6 - 14*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2026-10-20

Observatory

Pan-STARRS 1, Haleakala

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

1.151251

1-sigma variation

0.000067

Unit

Eccentricity (e)

Value

0.321865

1-sigma variation

0.000076

Unit

Inclination (i)

Value

5.2920

1-sigma variation

0.0018

Unit

Long. of Ascending Node (Ω)

Value

29.1248

1-sigma variation

0.0001

Unit

Arg. of Perihelion (ω)

Value

84.1920

1-sigma variation

0.0009

Unit

Mean Anomaly (M)

Value

2.12023

1-sigma variation

0.00262

Unit

Perihelion distance

Value

0.780703

1-sigma variation

Unit

Aphelion distance

Value

1.521799

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.005152

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.063163

1-sigma variation

Unit

MOID

Value

0.001538

1-sigma variation

Unit

Orbit Period

Value

451.1839

1-sigma variation

Unit

U parameter

Value

6.3

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	4.51946E-9	5.14131E-9	1.21879E-7	5.52896E-9	5.91325E-8	1.76060E-7
e	5.14131E-9	5.84917E-9	1.38681E-7	6.29082E-9	6.73408E-8	2.00271E-7
i	1.21879E-7	1.38681E-7	3.28966E-6	1.49191E-7	1.60001E-6	4.74681E-6
Ω	5.52896E-9	6.29082E-9	1.49191E-7	6.76964E-9	7.25240E-8	2.15348E-7
ω	5.91325E-8	6.73408E-8	1.60001E-6	7.25240E-8	7.85561E-7	2.30131E-6
M	1.76060E-7	2.00271E-7	4.74681E-6	2.15348E-7	2.30131E-6	6.85901E-6

Date of computation: 2026-10-27 13:17 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

28.096

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

6 - 14*

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

0.430842

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2026-10-20.388436

Unit

Source

[2]

Last Observation

Value

2026-10-23.127727

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

44 (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 2026UA1 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	1950-10-12 04:40	> 1 mo	0.1992270	0.0050174	238.6138948
EARTH	1952-04-20 12:05	> 1 mo	0.0706199	0.0050714	239.8351242
EARTH	1957-11-05 08:40	> 1 mo	0.1273987	0.0127719	118.1655120
EARTH	1972-04-16 19:52	> 1 mo	0.0054705	0.0052643	0.2179911
EARTH	1977-12-05 15:35	> 1 mo	0.1888064	0.0731405	0.8002869
EARTH	1985-04-12 21:19	> 1 mo	0.0629677	0.0040169	4.3136600
EARTH	1990-11-04 14:54	> 1 mo	0.1209826	0.0087113	3.3596399
EARTH	1998-03-17 05:34	> 1 mo	0.1672605	0.0371239	1.2537409
EARTH	2003-10-24 00:33	892.7	0.0019384	0.0011321	0.0080155
EARTH	2016-04-03 15:43	991.6	0.1018328	0.0832140	0.0062120
EARTH	2026-10-23 17:30	< 1 s	0.0014808	0.0014796	0.0000004
EARTH	2038-04-10 07:47	459.8	0.0274369	0.0179485	0.0042178
EARTH	2043-02-13 11:51	> 1 d	0.1979913	0.1955983	0.0007981
EARTH	2047-12-16 03:52	97.7	0.1940148	0.1938130	0.0000675
EARTH	2052-10-22 02:34	311.3	0.0256196	0.0169875	0.0028886
EARTH	2064-04-07 14:08	1111.8	0.0286686	0.0162713	0.0099267
EARTH	2073-10-18 21:03	541.8	0.0819788	0.0560762	0.0086343
EARTH	2080-04-18 18:41	70.6	0.1761769	0.1701192	0.0020193
EARTH	2089-10-30 10:20	1335.0	0.0769895	0.0536904	0.0077668
EARTH	2101-04-07 00:45	> 1 d	0.0529027	0.0178553	0.0130250
EARTH	2110-10-15 12:25	268.4	0.1719025	0.1613203	0.0035274
EARTH	2117-04-14 19:28	174.2	0.0731055	0.0630387	0.0033644
EARTH	2126-10-25 00:35	1001.0	0.0045877	0.0028244	0.0089951

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
294.98601635	287.90322779	0.00153762	MINIMUM
66.82724237	94.79782168	0.01753786	MINIMUM
1.22195837	11.81151090	0.21833036	SADDLE
180.59544426	190.87675215	0.51980185	SADDLE
0.74156031	191.14417689	1.79353561	SADDLE
180.26494025	10.63307412	2.50283688	MAXIMUM

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MOID Plots

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