Asteroids

2021RN1 help

Last update: 2025-09-10 09:18 UTC

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Amor

Perihelion (q)

1.076

Aphelion (Q)

2.092

Eccentricity (e)

0.321

Inclination (i)

39.5

deg

Orbit period (P)

728.1

Earth MOID

0.10839

U parameter

0.5

Next Earth close approach

Date

2027-08-29

Nominal distance (from Earth center)

0.13203

19750666

Maximum Brightness

19.4

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

22.3

mag

Diameter

90 - 210*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2021-09-05

Observatory

ATLAS-HKO, 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

1.583929

1-sigma variation

5.467E-9

Unit

Eccentricity (e)

Value

0.320886

1-sigma variation

4.393E-7

Unit

Inclination (i)

Value

39.4813

1-sigma variation

0.0001

Unit

Long. of Ascending Node (Ω)

Value

338.9421

1-sigma variation

4.861E-6

Unit

Arg. of Perihelion (ω)

Value

326.2995

1-sigma variation

0.0002

Unit

Mean Anomaly (M)

Value

57.53478

1-sigma variation

0.00010

Unit

Perihelion distance

Value

1.075669

1-sigma variation

Unit

Aphelion distance

Value

2.092189

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.111551

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.946896

1-sigma variation

Unit

MOID

Value

0.108394

1-sigma variation

Unit

Orbit Period

Value

728.1184

1-sigma variation

Unit

U parameter

Value

0.5

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	2.98912E-17	-2.27741E-16	-1.36218E-13	9.10927E-15	3.33860E-13	-1.85794E-13
e	-2.27741E-16	1.92947E-13	6.64784E-12	3.84276E-13	-9.77740E-11	4.35768E-11
i	-1.36218E-13	6.64784E-12	3.08761E-9	7.67794E-11	-5.23661E-9	2.53547E-9
Ω	9.10927E-15	3.84276E-13	7.67794E-11	2.36341E-11	-7.97563E-11	1.18063E-11
ω	3.33860E-13	-9.77740E-11	-5.23661E-9	-7.97563E-11	5.25523E-8	-2.38352E-8
M	-1.85794E-13	4.35768E-11	2.53547E-9	1.18063E-11	-2.38352E-8	1.08711E-8

Date of computation: 2025-09-10 09:18 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

22.252

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

90 - 210*

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

1461

Unit

Source

[1]

Unobserved

Value

Unit

Source

[1]

Normalized RMS of residuals

Value

0.576887

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2021-09-05.361563

Unit

Source

[2]

Last Observation

Value

2025-09-05.497242

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

175 (1)

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 2021RN1 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	2017-09-03 10:14	< 1 s	0.1651752	0.1651746	0.0000002
EARTH	2019-09-02 14:35	< 1 s	0.1355243	0.1355237	0.0000002
EARTH	2021-08-31 22:34	< 1 min	0.1163649	0.1163644	0.0000002
EARTH	2023-08-31 07:25	< 1 min	0.1092788	0.1092783	0.0000002
EARTH	2025-08-29 15:26	< 1 min	0.1151767	0.1151762	0.0000002
EARTH	2027-08-29 02:03	< 1 min	0.1320250	0.1320244	0.0000002
EARTH	2029-08-27 10:04	< 1 min	0.1596618	0.1596610	0.0000002
EARTH	2031-08-26 16:34	< 1 min	0.1940976	0.1940968	0.0000003

Download as:

Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
22.93361099	236.75625043	0.10839378	MINIMUM
273.81245499	91.00786424	0.76626106	MINIMUM
304.52025625	126.20482800	0.79137903	SADDLE
147.53467654	7.33335888	1.29357995	SADDLE
341.21014844	4.86907821	1.99920510	SADDLE
189.00347475	215.67058373	3.07107260	MAXIMUM

Download:

MOID Plots

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