Asteroids

2021PG5 help

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

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Apollo

Perihelion (q)

0.944

Aphelion (Q)

2.171

Eccentricity (e)

0.394

Inclination (i)

0.8

deg

Orbit period (P)

710.2

Earth MOID

0.00167

U parameter

7.0

Next Earth close approach

Date

2054-11-11

Nominal distance (from Earth center)

0.06398

9570535

Maximum Brightness

22.7

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

26.3

mag

Diameter

15 - 30*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2021-08-10

Observatory

ESA Optical Ground Station, Tenerife

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

1.557808

1-sigma variation

0.000357

Unit

Eccentricity (e)

Value

0.393771

1-sigma variation

0.000149

Unit

Inclination (i)

Value

0.8447

1-sigma variation

0.0003

Unit

Long. of Ascending Node (Ω)

Value

138.0171

1-sigma variation

0.0001

Unit

Arg. of Perihelion (ω)

Value

226.9497

1-sigma variation

0.0007

Unit

Mean Anomaly (M)

Value

52.37119

1-sigma variation

0.26791

Unit

Perihelion distance

Value

0.944389

1-sigma variation

Unit

Aphelion distance

Value

2.171228

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.811821

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.023252

1-sigma variation

Unit

MOID

Value

0.001668

1-sigma variation

Unit

Orbit Period

Value

710.1817

1-sigma variation

Unit

U parameter

Value

7.0

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	1.27370E-7	5.31521E-8	9.63986E-8	4.40076E-8	-2.52494E-7	-9.56134E-5
e	5.31521E-8	2.21807E-8	4.02277E-8	1.83649E-8	-1.05362E-7	-3.99001E-5
i	9.63986E-8	4.02277E-8	7.29935E-8	3.34151E-8	-1.91215E-7	-7.23643E-5
Ω	4.40076E-8	1.83649E-8	3.34151E-8	1.59661E-8	-8.79236E-8	-3.30356E-5
ω	-2.52494E-7	-1.05362E-7	-1.91215E-7	-8.79236E-8	5.03306E-7	1.89541E-4
M	-9.56134E-5	-3.99001E-5	-7.23643E-5	-3.30356E-5	1.89541E-4	7.17748E-2

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

26.282

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

15 - 30*

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

1553

Unit

Source

[1]

Normalized RMS of residuals

Value

0.633048

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2021-08-03.368648

Unit

Source

[2]

Last Observation

Value

2021-08-16.10819

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

58 (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 2021PG5 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	1962-11-05 06:49	> 1 w	0.0277334	0.0145735	0.0465004
EARTH	1964-08-21 22:41	> 1 w	0.0177609	0.0012398	0.0329526
EARTH	1966-07-28 12:30	> 1 d	0.1745697	0.0337612	0.0469374
EARTH	2017-11-19 06:42	585.1	0.1662357	0.1461891	0.0066859
EARTH	2019-10-24 02:05	> 1 d	0.0291670	0.0221019	0.0025025
EARTH	2021-08-15 08:00	< 1 s	0.0101883	0.0101779	0.0000035
EARTH	2054-11-11 19:17	> 1 w	0.0639751	0.0146060	0.0623829
EARTH	2056-08-16 13:16	> 1 w	0.0053431	0.0018045	0.0388129
EARTH	2077-11-20 20:35	> 1 mo	0.1468040	0.0135827	13.2861734
EARTH	2079-08-04 21:57	> 1 mo	0.1024671	0.0010268	12.9945417
EARTH	2100-11-05 15:24	> 1 mo	0.0136047	0.0134482	0.4197266
EARTH	2123-11-19 10:54	> 1 mo	0.1024747	0.0136160	200.2443964
EARTH	2125-08-04 12:59	> 1 mo	0.1206157	0.0023736	187.4536266

Download as:

Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
332.83938391	223.12636595	0.00180667	MINIMUM
22.76084787	297.49873304	0.01440912	MINIMUM
357.95817599	260.60321593	0.05870944	SADDLE
179.01908565	81.64645647	1.17362064	SADDLE
357.73400994	80.25704836	1.94180129	SADDLE
178.99744960	261.63017507	3.17316652	MAXIMUM

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MOID Plots

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