Asteroids

2026TN77 help

Last update: 2026-10-16 13:15 UTC

Orbital Properties

Epoch

61400.0

MJD

Orbit type

Aten

Perihelion (q)

0.439

Aphelion (Q)

1.276

Eccentricity (e)

0.488

Inclination (i)

7.6

deg

Orbit period (P)

290.0

Earth MOID

0.00049

U parameter

6.1

Next Earth close approach

Date

2028-01-09

Nominal distance (from Earth center)

0.18403

27529806

Maximum Brightness

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

27.2

mag

Diameter

10 - 21*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2026-10-13

Observatory

ATLAS South Africa, Sutherland

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

0.857347

1-sigma variation

0.000022

Unit

Eccentricity (e)

Value

0.487951

1-sigma variation

0.000191

Unit

Inclination (i)

Value

7.6308

1-sigma variation

0.0042

Unit

Long. of Ascending Node (Ω)

Value

19.0894

1-sigma variation

0.0005

Unit

Arg. of Perihelion (ω)

Value

224.7618

1-sigma variation

0.0016

Unit

Mean Anomaly (M)

Value

175.65760

1-sigma variation

0.02778

Unit

Perihelion distance

Value

0.439004

1-sigma variation

Unit

Aphelion distance

Value

1.275691

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.002064

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.515383

1-sigma variation

Unit

MOID

Value

0.000490

1-sigma variation

Unit

Orbit Period

Value

289.9571

1-sigma variation

Unit

U parameter

Value

6.1

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	4.96829E-10	4.01699E-9	8.92920E-8	4.07676E-9	-2.23134E-8	-5.98309E-7
e	4.01699E-9	3.64640E-8	7.96941E-7	6.06321E-8	-2.59798E-7	-5.29041E-6
i	8.92920E-8	7.96941E-7	1.74670E-5	1.25197E-6	-5.50556E-6	-1.16049E-4
Ω	4.07676E-9	6.06321E-8	1.25197E-6	2.31969E-7	-7.33023E-7	-8.06374E-6
ω	-2.23134E-8	-2.59798E-7	-5.50556E-6	-7.33023E-7	2.58392E-6	3.58908E-5
M	-5.98309E-7	-5.29041E-6	-1.16049E-4	-8.06374E-6	3.58908E-5	7.72005E-4

Date of computation: 2026-10-16 13:15 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

27.23

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

10 - 21*

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

[-]

Download this part as:

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

0.661529

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2026-10-13.862253

Unit

Source

[2]

Last Observation

Value

2026-10-15.77552

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

30 (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 2026TN77 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
MERCURY	1950-05-24 14:30	> 1 mo	0.0409803	0.0081908	0.7063616
MERCURY	1954-04-07 05:30	> 1 mo	0.0118366	0.0001194	0.3587009
MERCURY	1958-02-16 10:48	> 1 mo	0.0315152	0.0001761	1.1436347
EARTH	1961-01-05 23:48	> 1 mo	0.1024603	0.0975970	0.4700162
EARTH	1966-10-12 12:25	> 1 w	0.0426708	0.0023009	2.9633319
EARTH	1971-01-01 07:36	> 1 mo	0.1712028	0.1002907	2.0630962
MERCURY	1972-09-27 14:50	> 1 mo	0.0447896	0.0238334	4.0216658
MERCURY	1976-08-06 15:52	> 1 mo	0.0273895	0.0235982	2.1025666
EARTH	1976-10-14 06:28	> 1 mo	0.1117057	0.0016567	2.8685343
MERCURY	1980-06-16 03:18	> 1 mo	0.0244874	0.0235971	0.8166407
EARTH	1983-10-25 06:00	> 1 mo	0.1984924	0.0240510	1.2810401
MERCURY	1984-04-24 19:42	> 1 mo	0.0283313	0.0238884	1.1838381
VENUS	1985-10-09 23:13	> 1 mo	0.0367387	0.0262948	1.4851709
EARTH	1988-01-05 22:13	> 1 w	0.1195194	0.0974955	0.6719504
MERCURY	1988-03-01 01:44	> 1 mo	0.0245953	0.0237216	0.3637938
VENUS	1988-11-07 20:25	> 1 mo	0.0283454	0.0262252	0.4505879
VENUS	1989-10-27 14:38	> 1 mo	0.0410650	0.0040552	1.0571345
VENUS	1991-12-07 10:36	> 1 w	0.0470273	0.0261602	0.5579126
MERCURY	1992-01-05 01:30	> 1 mo	0.0327257	0.0238190	0.5015859
VENUS	1992-11-25 02:08	> 1 w	0.0142346	0.0039562	0.4055732
EARTH	1993-10-18 01:30	> 1 d	0.1496625	0.0662641	0.0465020
VENUS	1995-12-23 13:35	> 1 mo	0.0144383	0.0041121	1.0479487
EARTH	1998-01-05 03:42	> 1 w	0.1163614	0.0978201	0.2604400
VENUS	1998-01-30 19:54	> 1 w	0.0400256	0.0264978	0.4427857
VENUS	1999-01-19 01:57	> 1 w	0.0396572	0.0044651	0.4020666
MERCURY	2000-07-05 18:53	985.2	0.0005025	0.0000934	0.0069032
VENUS	2001-02-26 19:14	378.9	0.0301052	0.0262804	0.0034752
VENUS	2002-02-15 13:13	367.0	0.0399937	0.0198153	0.0067620
EARTH	2003-10-21 01:01	836.4	0.1715075	0.1606842	0.0036088
VENUS	2004-03-27 08:04	340.6	0.0494745	0.0341799	0.0056542
MERCURY	2004-05-09 22:47	1221.9	0.0253469	0.0115946	0.0045907
VENUS	2005-03-15 22:53	298.9	0.0152845	0.0040267	0.0052302
EARTH	2008-01-05 14:51	232.6	0.1169532	0.1115215	0.0019334
MERCURY	2008-03-08 13:27	> 1 d	0.0487834	0.0473378	0.0005066
VENUS	2008-04-12 11:33	328.3	0.0144130	0.0042625	0.0058995
VENUS	2010-05-21 16:52	317.6	0.0412470	0.0311002	0.0039923
VENUS	2011-05-09 22:47	291.9	0.0403559	0.0238517	0.0055250
MERCURY	2012-01-01 08:39	539.3	0.0319194	0.0245657	0.0036086
VENUS	2013-06-17 01:07	205.3	0.0268850	0.0266778	0.0003228
VENUS	2016-07-13 00:09	188.9	0.0447963	0.0372642	0.0026587
MERCURY	2016-08-27 20:59	298.7	0.0458765	0.0332422	0.0042116
EARTH	2016-10-15 22:23	131.5	0.1670826	0.1581025	0.0029934
EARTH	2018-01-01 16:45	102.5	0.1967351	0.1907869	0.0019916
MERCURY	2020-06-19 13:51	639.6	0.0494470	0.0489562	0.0001666
EARTH	2026-10-12 15:24	< 1 min	0.0003704	0.0003699	0.0000002
EARTH	2028-01-09 05:26	36.3	0.1840254	0.1821826	0.0006185
MERCURY	2028-03-17 23:43	91.8	0.0351664	0.0334733	0.0005689
EARTH	2030-10-18 14:50	140.5	0.1642055	0.1621531	0.0006842
MERCURY	2036-02-17 13:29	766.8	0.0354793	0.0339510	0.0005095
VENUS	2037-10-22 23:09	175.1	0.0108682	0.0094469	0.0014164
MERCURY	2041-09-12 20:06	1333.0	0.0423485	0.0173094	0.0129928
EARTH	2047-01-11 04:29	1045.6	0.1633928	0.1379579	0.0106338
VENUS	2047-12-03 06:22	> 1 d	0.0406161	0.0392782	0.0062258
MERCURY	2049-08-04 19:14	> 1 d	0.0317162	0.0296842	0.0074382
EARTH	2049-10-12 22:42	566.1	0.0295053	0.0005036	0.0242331
EARTH	2051-01-10 02:12	846.6	0.1657141	0.1352530	0.0142446
EARTH	2053-10-16 10:28	> 1 d	0.1440319	0.1030400	0.0136693
MERCURY	2055-03-08 17:43	> 1 d	0.0269821	0.0179868	0.0118274
MERCURY	2063-02-04 10:04	> 1 d	0.0372192	0.0370536	0.0000687
VENUS	2067-12-15 15:02	1298.9	0.0099550	0.0090651	0.0096894
MERCURY	2071-01-06 11:33	> 1 w	0.0381143	0.0299256	0.0756870
EARTH	2072-10-15 15:27	> 1 d	0.1387117	0.0012468	0.1264762
EARTH	2074-01-12 18:00	> 1 d	0.1322790	0.1313464	0.0175894
MERCURY	2076-08-14 00:30	> 1 w	0.0275604	0.0183869	0.2024674
EARTH	2076-10-12 05:15	843.9	0.0243598	0.0013406	0.2033750
EARTH	2080-10-21 12:32	> 1 w	0.1893980	0.0477755	0.0482265
MERCURY	2084-07-11 19:47	> 1 w	0.0373247	0.0346166	0.0084400
MERCURY	2090-02-09 03:06	> 1 w	0.0355892	0.0178487	0.3275233
VENUS	2092-07-24 12:43	> 1 w	0.0086555	0.0086274	0.0345319
EARTH	2097-01-11 07:06	> 1 mo	0.1637482	0.1319038	2.3007271
MERCURY	2098-01-08 20:24	> 1 mo	0.0375462	0.0211541	0.5881565
EARTH	2099-10-13 22:06	> 1 mo	0.0424149	0.0022561	5.9066708
EARTH	2101-01-11 13:21	> 1 mo	0.1557251	0.1317789	3.3501034
EARTH	2103-10-16 06:15	> 1 mo	0.1194589	0.0014987	5.5052107
MERCURY	2105-12-12 22:24	> 1 mo	0.0305392	0.0304577	0.4507258
MERCURY	2111-07-19 08:19	> 1 mo	0.0356642	0.0183594	6.5130374
VENUS	2117-03-05 21:34	> 1 mo	0.0373087	0.0082650	5.2782588
MERCURY	2119-06-24 12:15	> 1 mo	0.0260588	0.0178385	1.4154720
VENUS	2121-09-30 20:35	> 1 w	0.0384162	0.0383489	0.0190556
EARTH	2124-01-13 10:55	> 1 w	0.1628514	0.1311519	0.6004989
EARTH	2126-10-15 02:52	> 1 mo	0.0573162	0.0028033	3.1177049

Download as:

Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
109.55642300	276.80438322	0.00049038	MINIMUM
253.88112792	8.38398944	0.13053451	MINIMUM
183.77891968	323.28257290	0.30828963	SADDLE
3.72352733	145.80994291	0.57656623	SADDLE
2.76701218	324.16058010	1.42409881	SADDLE
180.40220545	141.33048570	2.28460232	MAXIMUM

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MOID Plots

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