Asteroids

2021NX1 help

Last update: 2025-09-10 00:30 UTC

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Apollo

Perihelion (q)

0.977

Aphelion (Q)

3.298

Eccentricity (e)

0.543

Inclination (i)

10.6

deg

Orbit period (P)

1141.4

Earth MOID

0.00758

U parameter

8.3

Next Earth close approach

Date

2046-07-01

Nominal distance (from Earth center)

0.13553

20274927

Maximum Brightness

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

25.7

mag

Diameter

19 - 40*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2021-07-07

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

61000.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

2.137481

1-sigma variation

0.005099

Unit

Eccentricity (e)

Value

0.542737

1-sigma variation

0.001082

Unit

Inclination (i)

Value

10.6013

1-sigma variation

0.0150

Unit

Long. of Ascending Node (Ω)

Value

113.0113

1-sigma variation

0.0019

Unit

Arg. of Perihelion (ω)

Value

210.7973

1-sigma variation

0.0012

Unit

Mean Anomaly (M)

Value

133.02795

1-sigma variation

1.75526

Unit

Perihelion distance

Value

0.977391

1-sigma variation

Unit

Aphelion distance

Value

3.297572

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

1.840505

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.010669

1-sigma variation

Unit

MOID

Value

0.007582

1-sigma variation

Unit

Orbit Period

Value

1141.4370

1-sigma variation

Unit

U parameter

Value

8.3

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	2.59953E-5	5.51570E-6	7.65443E-5	-9.52497E-6	5.92750E-6	-8.94928E-3
e	5.51570E-6	1.17033E-6	1.62413E-5	-2.02102E-6	1.25774E-6	-1.89887E-3
i	7.65443E-5	1.62413E-5	2.25417E-4	-2.80477E-5	1.74952E-5	-2.63516E-2
Ω	-9.52497E-6	-2.02102E-6	-2.80477E-5	3.49051E-6	-2.17313E-6	3.27912E-3
ω	5.92750E-6	1.25774E-6	1.74952E-5	-2.17313E-6	1.41745E-6	-2.04066E-3
M	-8.94928E-3	-1.89887E-3	-2.63516E-2	3.27912E-3	-2.04066E-3	3.08093E0

Date of computation: 2025-09-10 00:30 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

25.716

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

19 - 40*

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

1531

Unit

Source

[1]

Normalized RMS of residuals

Value

0.426885

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2021-07-07.363943

Unit

Source

[2]

Last Observation

Value

2021-07-15.07225

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

19 (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

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 2021NX1 from 1950 to 2125

Body	Date in UTC	Time uncert. in min	Nominal distance in au	Min. possible distance in au	Distance uncert. in au
EARTH	1962-06-27 06:42	> 1 mo	0.1826008	0.0164112	0.9747078
EARTH	1993-07-28 16:43	> 1 mo	0.0545623	0.0024362	0.4389963
EARTH	2021-07-19 23:03	< 1 min	0.0165710	0.0164849	0.0000287
EARTH	2046-07-01 01:10	> 1 mo	0.1355295	0.0086857	0.5314980
EARTH	2099-08-31 03:34	> 1 mo	0.1391942	0.1081497	0.1132365
EARTH	2124-07-25 10:32	314.9	0.0390094	0.0359322	0.0010289

Download as:

Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
344.10343574	193.00786146	0.00989809	MINIMUM
359.70423083	41.23193670	1.96422242	SADDLE
180.28714999	41.11497598	2.31535311	SADDLE
179.40287158	220.63437445	4.30552648	MAXIMUM

Download:

MOID Plots

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