Asteroids

2021RP16 help

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

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Apollo

Perihelion (q)

0.917

Aphelion (Q)

2.826

Eccentricity (e)

0.510

Inclination (i)

6.5

deg

Orbit period (P)

935.1

Earth MOID

0.01731

U parameter

9.0

Next Earth close approach

Date

2044-11-25

Nominal distance (from Earth center)

0.11428

17096349

Maximum Brightness

25.3

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

26.1

mag

Diameter

16 - 40*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2021-09-14

Observatory

Mt. Lemmon Survey

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

1.871477

1-sigma variation

0.028199

Unit

Eccentricity (e)

Value

0.510201

1-sigma variation

0.008236

Unit

Inclination (i)

Value

6.4723

1-sigma variation

0.0581

Unit

Long. of Ascending Node (Ω)

Value

166.4760

1-sigma variation

0.0219

Unit

Arg. of Perihelion (ω)

Value

231.9897

1-sigma variation

0.1894

Unit

Mean Anomaly (M)

Value

214.48495

1-sigma variation

12.76680

Unit

Perihelion distance

Value

0.916648

1-sigma variation

Unit

Aphelion distance

Value

2.826305

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

1.025112

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.045509

1-sigma variation

Unit

MOID

Value

0.017312

1-sigma variation

Unit

Orbit Period

Value

935.1366

1-sigma variation

Unit

U parameter

Value

9.0

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	7.95182E-4	2.32220E-4	1.63277E-3	-5.93491E-4	5.15347E-3	-3.60009E-1
e	2.32220E-4	6.78275E-5	4.76371E-4	-1.73957E-4	1.51027E-3	-1.05136E-1
i	1.63277E-3	4.76371E-4	3.37113E-3	-1.19277E-3	1.03675E-2	-7.39175E-1
Ω	-5.93491E-4	-1.73957E-4	-1.19277E-3	4.79132E-4	-4.14628E-3	2.68758E-1
ω	5.15347E-3	1.51027E-3	1.03675E-2	-4.14628E-3	3.58880E-2	-2.33368E0
M	-3.60009E-1	-1.05136E-1	-7.39175E-1	2.68758E-1	-2.33368E0	1.62990E2

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

26.107

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

16 - 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

0.7

Unit

Source

[1]

Unobserved

Value

1509

Unit

Source

[1]

Normalized RMS of residuals

Value

0.581839

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2021-09-14.366181

Unit

Source

[2]

Last Observation

Value

2021-09-15.039407

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

16 (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 2021RP16 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	1985-11-29 22:10	> 1 mo	0.1124396	0.1116971	0.2372961
EARTH	2003-10-11 04:15	> 1 mo	0.0886390	0.0112940	1.2598754
EARTH	2021-09-15 11:39	15.9	0.0224280	0.0214929	0.0003117
EARTH	2044-11-25 01:23	> 1 mo	0.1142820	0.1125147	0.3479150
EARTH	2062-08-31 22:56	> 1 mo	0.1864576	0.0096404	6.1718933
EARTH	2085-09-28 21:47	> 1 mo	0.0580110	0.0137108	4.0372736
EARTH	2108-12-25 04:01	> 1 mo	0.1755566	0.1118824	5.8590009

Download as:

Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
334.15253726	253.16723453	0.01753795	MINIMUM
20.53076865	331.95001963	0.11093475	MINIMUM
6.30807691	307.93652179	0.11760233	SADDLE
179.82685597	115.65402693	1.82547404	SADDLE
358.74293958	114.78098401	1.92137499	SADDLE
179.34377962	295.38207656	3.81619833	MAXIMUM

Download:

MOID Plots

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