Asteroids

2021RN16 help

Last update: 2025-07-15 00:51 UTC

Orbital Properties

Epoch

60800.0

MJD

Orbit type

Apollo

Perihelion (q)

0.787

Aphelion (Q)

1.638

Eccentricity (e)

0.351

Inclination (i)

1.1

deg

Orbit period (P)

487.6

Earth MOID

0.00143

U parameter

7.6

Next Earth close approach

Date

2025-09-23

Nominal distance (from Earth center)

0.02522

3772290

Maximum Brightness

23.8

mag

Risk

Object is not in risk list

Object is not in priority list

Physical Properties

Absolute Magnitude (H)

28.4

mag

Diameter

6 - 13*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2021-09-13

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

60800.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

1.212470

1-sigma variation

0.000449

Unit

Eccentricity (e)

Value

0.350864

1-sigma variation

0.000398

Unit

Inclination (i)

Value

1.1162

1-sigma variation

0.0014

Unit

Long. of Ascending Node (Ω)

Value

174.5462

1-sigma variation

0.0029

Unit

Arg. of Perihelion (ω)

Value

264.4033

1-sigma variation

0.0124

Unit

Mean Anomaly (M)

Value

212.62477

1-sigma variation

0.50926

Unit

Perihelion distance

Value

0.787058

1-sigma variation

Unit

Aphelion distance

Value

1.637882

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.105656

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.023733

1-sigma variation

Unit

MOID

Value

0.001432

1-sigma variation

Unit

Orbit Period

Value

487.6463

1-sigma variation

Unit

U parameter

Value

7.6

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	2.01492E-7	1.74442E-7	6.47140E-7	1.18383E-6	-2.66625E-6	-2.28596E-4
e	1.74442E-7	1.58215E-7	5.49935E-7	9.31539E-7	-1.38359E-6	-1.97781E-4
i	6.47140E-7	5.49935E-7	2.09475E-6	3.93096E-6	-9.88566E-6	-7.34372E-4
Ω	1.18383E-6	9.31539E-7	3.93096E-6	8.18744E-6	-2.76855E-5	-1.34471E-3
ω	-2.66625E-6	-1.38359E-6	-9.88566E-6	-2.76855E-5	1.54185E-4	3.04110E-3
M	-2.28596E-4	-1.97781E-4	-7.34372E-4	-1.34471E-3	3.04110E-3	2.59349E-1

Date of computation: 2025-07-15 00:51 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

28.355

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

6 - 13*

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

1407

Unit

Source

[1]

Normalized RMS of residuals

Value

0.361304

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2021-09-13.347457

Unit

Source

[2]

Last Observation

Value

2021-09-15.503265

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

17 (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 2021RN16 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	1954-10-17 10:40	> 1 mo	0.1289925	0.0045902	2.3867051
EARTH	1959-02-28 15:49	> 1 mo	0.1079365	0.0081263	4.2476661
EARTH	1965-09-12 07:25	> 1 mo	0.1500453	0.0004604	4.1727780
EARTH	1970-01-17 14:02	> 1 mo	0.1483474	0.0035588	2.0549870
EARTH	1980-11-13 21:53	> 1 mo	0.1763595	0.0166373	0.5784275
EARTH	1991-09-20 18:09	> 1 w	0.0255184	0.0012297	0.3363704
EARTH	1996-02-03 18:55	> 1 mo	0.1134078	0.0061824	0.2439676
EARTH	2006-10-01 10:59	> 1 w	0.0764031	0.0014749	0.0664622
EARTH	2011-02-21 05:29	> 1 d	0.0142791	0.0080155	0.0399215
EARTH	2021-09-21 11:48	7.1	0.0032109	0.0031995	0.0000038
EARTH	2025-09-23 20:31	> 1 d	0.0252162	0.0013418	0.0139165
EARTH	2029-10-08 02:02	> 1 d	0.1096878	0.0910325	0.0062185
EARTH	2033-11-06 17:49	> 1 w	0.1713081	0.1404242	0.0102995
EARTH	2037-11-30 06:20	> 1 w	0.1955755	0.1835563	0.0040105
EARTH	2041-12-21 06:56	> 1 mo	0.1937152	0.1662971	0.0091405
EARTH	2046-01-13 12:17	> 1 mo	0.1662379	0.0617352	0.0348344
EARTH	2050-02-13 08:53	> 1 w	0.0936387	0.0048554	0.1174918
EARTH	2054-02-25 04:10	> 1 w	0.0060490	0.0058748	0.0333312
EARTH	2058-03-01 01:13	> 1 mo	0.0549369	0.0057689	6.7895135
EARTH	2062-03-06 03:16	> 1 mo	0.1422346	0.0053717	9.0289906
EARTH	2104-09-11 23:44	> 1 mo	0.1782362	0.0014095	2.5949485
EARTH	2108-09-16 19:55	> 1 mo	0.0911834	0.0023668	4.5080737
EARTH	2112-09-21 06:01	> 1 mo	0.0224419	0.0027663	5.2541883
MARS	2116-01-09 20:45	> 1 mo	0.0338050	0.0327272	1.5996137
EARTH	2116-09-20 10:06	> 1 mo	0.0352620	0.0029176	12.4904213
EARTH	2120-09-16 11:55	> 1 mo	0.0986488	0.0026675	12.3017981
EARTH	2124-09-12 01:21	> 1 mo	0.1795337	0.0022405	9.4144106

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
299.39961460	257.36504077	0.00143247	MINIMUM
58.57809103	53.91563322	0.00581166	MINIMUM
358.73124824	335.37416823	0.19869552	SADDLE
179.38177064	156.05236749	0.62345999	SADDLE
358.65724809	155.28385174	1.80185072	SADDLE
179.38814954	336.06381835	2.62275574	MAXIMUM

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MOID Plots

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