Asteroids

2021NM3 help

Last update: 2024-04-19 00:31 UTC

Orbital Properties

Epoch

60400.0

MJD

Orbit type

Apollo

Perihelion (q)

0.751

Aphelion (Q)

1.305

Eccentricity (e)

0.270

Inclination (i)

3.7

deg

Orbit period (P)

380.8

Earth MOID

0.00408

U parameter

6.8

Next Earth close approach

Date

2024-12-30

Nominal distance (from Earth center)

0.16357

24470022

Maximum Brightness

27.8

mag

Risk

Object is in risk list

Object is not in priority list

Physical Properties

Absolute Magnitude (H)

26.6

mag

Diameter

13 - 29*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2021-07-09

Observatory

Mt. Lemmon Survey

Orbit Visualiser

Click the button to start Orbit Visualiser

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

60400.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

1.028247

1-sigma variation

0.000091

Unit

Eccentricity (e)

Value

0.269558

1-sigma variation

0.000189

Unit

Inclination (i)

Value

3.7410

1-sigma variation

0.0027

Unit

Long. of Ascending Node (Ω)

Value

116.1922

1-sigma variation

0.0006

Unit

Arg. of Perihelion (ω)

Value

279.5746

1-sigma variation

0.0052

Unit

Mean Anomaly (M)

Value

144.23825

1-sigma variation

0.09802

Unit

Perihelion distance

Value

0.751075

1-sigma variation

Unit

Aphelion distance

Value

1.305419

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.070773

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.017566

1-sigma variation

Unit

MOID

Value

0.004082

1-sigma variation

Unit

Orbit Period

Value

380.8419

1-sigma variation

Unit

U parameter

Value

6.8

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	8.29002E-9	1.71705E-8	2.41618E-7	5.12301E-8	-4.76009E-7	-8.92492E-6
e	1.71705E-8	3.55829E-8	5.00799E-7	1.05804E-7	-9.84328E-7	-1.84845E-5
i	2.41618E-7	5.00799E-7	7.04919E-6	1.48643E-6	-1.38429E-5	-2.60103E-4
Ω	5.12301E-8	1.05804E-7	1.48643E-6	3.23984E-7	-2.96942E-6	-5.51696E-5
ω	-4.76009E-7	-9.84328E-7	-1.38429E-5	-2.96942E-6	2.74678E-5	5.12547E-4
M	-8.92492E-6	-1.84845E-5	-2.60103E-4	-5.51696E-5	5.12547E-4	9.60848E-3

Date of computation: 2024-02-21 14:29 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

26.552

Unit

mag

Source

[1]

Slope Parameter (G)

Value

0.15**

Unit

mag

Source

[1]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

0.05 - 0.25

Unit

Source

[2]

Diameter

Value

13 - 29*

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 ODIM	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

1011

Unit

Source

[1]

Normalized RMS of residuals

Value

0.541651

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2021-07-07.455203

Unit

Source

[2]

Last Observation

Value

2021-07-13.06252

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

[3]

Last Observation

Value

Unit

Source

[3]

Delay (Discarded)

Value

0 (0)

Unit

Source

[1]

Doppler (Discarded)

Value

0 (0)

Unit

Source

[1]

Total Radar Observations (Discarded)

Value

0 (0)

Unit

Source

[1]

Note: The ASCII file is in a format suitable for Orbfit input.

Sources

No.	Name	Additional
[1]	ESA ODIM	ESA orbit determination and impact monitoring system
[2]	MPC	Minor Planet Center: https://www.minorplanetcenter.net
[3]	JPL Radar Observations	Jet Propulsion Laboratory: https://ssd.jpl.nasa.gov/dat/radar_data_ast.txt

Computation parameters

As seen from:

Initial Date: *

Final Date: *

Output option:

One line per time step

Time step:*

* - these fields are required

Close approaches for 2021NM3 from 1950 to 2124

Body	Date in UTC	Time uncert. in min	Nominal distance in au	Min. possibile distance in au	Distance uncert. in au
EARTH	1958-07-18 23:32	> 1 d	0.0952974	0.0060373	0.1619435
EARTH	1960-12-12 11:04	> 1 mo	0.1923597	0.0633201	0.0908528
EARTH	1962-02-03 04:14	> 1 w	0.1027604	0.0149803	0.1880382
VENUS	1974-07-03 17:25	> 1 w	0.0386849	0.0273249	0.0357012
EARTH	1978-07-10 06:25	> 1 d	0.1123918	0.0056616	0.0727722
EARTH	1979-06-27 04:38	> 1 w	0.1861317	0.0279434	0.0546060
EARTH	1979-08-25 06:12	> 1 mo	0.1811545	0.0604539	0.0435828
EARTH	1982-01-19 09:39	> 1 w	0.1314594	0.0211859	0.0712458
EARTH	1983-02-07 08:40	> 1 d	0.1810686	0.0163708	0.0672284
VENUS	1992-05-09 06:07	> 1 d	0.0338522	0.0328601	0.0015772
EARTH	2000-07-18 14:52	1272.6	0.0901207	0.0091953	0.0274522
EARTH	2004-02-02 19:18	> 1 d	0.0722394	0.0155608	0.0289191
VENUS	2010-03-10 02:08	> 1 d	0.0377510	0.0291415	0.0040839
EARTH	2021-07-14 21:55	< 1 min	0.0108952	0.0108711	0.0000080
EARTH	2024-12-30 06:17	> 1 d	0.1635720	0.1590536	0.0015087
EARTH	2025-02-12 16:30	1196.6	0.1678770	0.1624535	0.0018078
EARTH	2026-02-05 11:28	174.5	0.1024019	0.0935263	0.0029630
VENUS	2031-02-16 00:20	> 1 d	0.0344466	0.0279005	0.0023116
EARTH	2045-07-15 01:15	> 1 d	0.0151499	0.0033133	0.0497101
EARTH	2050-02-01 20:22	> 1 w	0.0211048	0.0195692	0.1304050
EARTH	2071-07-08 17:48	> 1 mo	0.1715591	0.0046792	1.5077719
EARTH	2072-07-17 14:57	> 1 mo	0.0630188	0.0025175	1.2372710
EARTH	2076-01-01 15:45	> 1 w	0.1632940	0.1080405	0.0217092
EARTH	2076-02-14 10:24	> 1 w	0.1671872	0.0680097	0.0347402
EARTH	2077-02-05 13:33	> 1 w	0.0839679	0.0192835	0.3861674
EARTH	2097-07-09 02:59	> 1 mo	0.1579414	0.0034447	3.6886028
EARTH	2098-07-19 06:14	> 1 mo	0.0910112	0.0022341	3.5441027
EARTH	2102-01-28 08:09	> 1 mo	0.1066659	0.0220088	2.3056483
EARTH	2103-02-10 11:11	> 1 mo	0.1615191	0.0204616	1.5408717
EARTH	2122-07-12 07:49	> 1 mo	0.1167683	0.0023547	10.3628583
EARTH	2123-07-16 18:02	> 1 mo	0.1402374	0.0020531	10.1473197

Download as:

2021NM3

Date in UTC	MJD	σ	Distance ± Width in RE	Stretching in RE/σ	IP	Exp. energy	PS
2111-07-18.626	92284.626	-0.768	0.41 ± 0.008	1.32E7	7.39E-8	9.72E-9	-8.25
2112-07-17.900	92649.900	-1.410	0.19 ± 0.008	4.72E6	1.05E-7	1.38E-8	-8.11
2112-07-17.910	92649.910	-0.774	0.47 ± 0.005	2.52E6	3.84E-7	5.06E-8	-7.54
2113-07-18.379	93015.379	-0.457	1.11 ± 0.015	7.08E6	1.29E-7	1.70E-8	-8.02
2117-07-18.064	94476.064	-0.386	0.40 ± 0.017	5.22E6	2.33E-7	3.07E-8	-7.78
2117-07-18.359	94476.359	-0.487	0.37 ± 0.015	1.44E5	8.15E-6	1.07E-6	-6.24


Based on 30 optical observations (of which 0 are rejected as outliers) from 2021/07/07.455 to 2021/07/13.063.
Coordinates are given on the Target Plane.
Unit is one Earth radius, but impact cross section has radius between 1.69 and 1.69 Earth radii.
Coordinates for LOV = EQU scaled= 1 second= F.
AstOD software version= 4.0, Date of computation=20240110 090432.991 UTC.

Download this part as:

Download Impactor Table as: