Asteroids

2021OD1 help

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

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Aten

Perihelion (q)

0.609

Aphelion (Q)

1.060

Eccentricity (e)

0.270

Inclination (i)

11.4

deg

Orbit period (P)

278.5

Earth MOID

0.00081

U parameter

5.4

Next Earth close approach

Date

2037-07-23

Nominal distance (from Earth center)

0.06166

9224767

Maximum Brightness

24.6

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

28.3

mag

Diameter

6 - 13*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2021-07-30

Observatory

ATLAS-MLO, Mauna Loa

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

0.834709

1-sigma variation

0.000007

Unit

Eccentricity (e)

Value

0.270008

1-sigma variation

0.000013

Unit

Inclination (i)

Value

11.3580

1-sigma variation

0.0011

Unit

Long. of Ascending Node (Ω)

Value

127.8002

1-sigma variation

4.571E-5

Unit

Arg. of Perihelion (ω)

Value

332.4070

1-sigma variation

0.0004

Unit

Mean Anomaly (M)

Value

99.45492

1-sigma variation

0.02407

Unit

Perihelion distance

Value

0.609331

1-sigma variation

Unit

Aphelion distance

Value

1.060087

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.360882

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.001036

1-sigma variation

Unit

MOID

Value

0.000806

1-sigma variation

Unit

Orbit Period

Value

278.5487

1-sigma variation

Unit

U parameter

Value

5.4

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	4.33175E-11	-8.78584E-11	-7.03621E-9	2.90847E-10	-1.10876E-9	-1.58367E-7
e	-8.78584E-11	1.80623E-10	1.41445E-8	-5.95893E-10	1.74810E-9	3.22183E-7
i	-7.03621E-9	1.41445E-8	1.28289E-6	-4.29324E-8	2.13431E-7	2.56498E-5
Ω	2.90847E-10	-5.95893E-10	-4.29324E-8	2.08965E-9	-5.98597E-9	-1.06644E-6
ω	-1.10876E-9	1.74810E-9	2.13431E-7	-5.98597E-9	1.32177E-7	3.85067E-6
M	-1.58367E-7	3.22183E-7	2.56498E-5	-1.06644E-6	3.85067E-6	5.79380E-4

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

28.277

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

0.6

Unit

Source

[1]

Unobserved

Value

1561

Unit

Source

[1]

Normalized RMS of residuals

Value

0.787692

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2021-07-30.52377

Unit

Source

[2]

Last Observation

Value

2021-07-31.13703

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

29 (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 2021OD1 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	1960-08-02 09:56	> 1 w	0.0379596	0.0026965	0.2175883
EARTH	1963-07-15 04:24	> 1 mo	0.1044203	0.0447665	0.1585904
EARTH	1982-08-03 09:51	958.6	0.1643899	0.0408797	0.0416358
EARTH	1985-07-31 06:34	101.7	0.0040951	0.0014503	0.0009289
EARTH	1998-07-15 07:40	259.8	0.1056471	0.1032728	0.0007932
EARTH	2008-08-02 21:15	6.9	0.1201131	0.1174812	0.0008773
EARTH	2011-06-24 12:44	118.2	0.1720437	0.1707691	0.0004264
VENUS	2019-08-25 18:28	24.5	0.0474338	0.0473683	0.0000224
EARTH	2021-07-31 12:15	< 1 s	0.0017025	0.0017020	0.0000002
EARTH	2024-06-11 16:15	23.5	0.1917481	0.1914159	0.0001109
EARTH	2037-07-23 18:44	201.5	0.0616638	0.0593960	0.0007567
EARTH	2050-08-03 08:32	3.6	0.0974954	0.0925479	0.0016495
EARTH	2053-07-02 04:49	422.8	0.1350751	0.1323714	0.0009088
EARTH	2066-08-01 08:26	133.2	0.0137543	0.0088311	0.0016546
EARTH	2069-06-27 06:29	1264.4	0.1456694	0.1364961	0.0031639
EARTH	2085-08-02 13:47	1439.1	0.0502660	0.0046799	0.0385170
EARTH	2088-07-08 14:14	> 1 d	0.1152038	0.0712938	0.0180124
EARTH	2104-08-03 03:29	631.6	0.1705871	0.0926896	0.0260525
EARTH	2107-07-29 23:25	> 1 d	0.0272441	0.0039875	0.0298747
EARTH	2110-06-16 09:19	> 1 d	0.1794012	0.1616012	0.0067206
EARTH	2123-08-04 08:36	700.7	0.1426043	0.0123766	0.0598672

Download as:

Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
216.35112643	206.35243707	0.00208720	MINIMUM
347.27149341	342.28334332	0.38476968	SADDLE
357.31640817	175.08707832	1.62389140	SADDLE
181.50669482	359.57716010	2.04168750	MAXIMUM

Download:

MOID Plots

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