Asteroids

2021QM1 help

Last update: 2025-11-24 16:53 UTC

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Apollo

Perihelion (q)

0.501

Aphelion (Q)

2.557

Eccentricity (e)

0.672

Inclination (i)

1.8

deg

Orbit period (P)

690.5

Earth MOID

0.00023

U parameter

3.9

Next Earth close approach

Date

2038-09-13

Nominal distance (from Earth center)

0.11789

17635802

Maximum Brightness

22.4

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

24.2

mag

Diameter

40 - 90*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2021-08-28

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

1.528894

1-sigma variation

0.000003

Unit

Eccentricity (e)

Value

0.672421

1-sigma variation

0.000001

Unit

Inclination (i)

Value

1.7595

1-sigma variation

1.470E-5

Unit

Long. of Ascending Node (Ω)

Value

192.7896

1-sigma variation

0.0003

Unit

Arg. of Perihelion (ω)

Value

255.5673

1-sigma variation

0.0003

Unit

Mean Anomaly (M)

Value

54.88873

1-sigma variation

0.00235

Unit

Perihelion distance

Value

0.500833

1-sigma variation

Unit

Aphelion distance

Value

2.556955

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.005745

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.282981

1-sigma variation

Unit

MOID

Value

0.000229

1-sigma variation

Unit

Orbit Period

Value

690.5012

1-sigma variation

Unit

U parameter

Value

3.9

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	9.20797E-12	3.68299E-12	2.05837E-11	-1.90145E-10	3.27616E-10	-7.14569E-9
e	3.68299E-12	1.48300E-12	8.41373E-12	-7.92781E-11	1.35801E-10	-2.85794E-9
i	2.05837E-11	8.41373E-12	2.15999E-10	-3.74524E-9	4.07375E-9	-1.59691E-8
Ω	-1.90145E-10	-7.92781E-11	-3.74524E-9	6.94061E-8	-7.25883E-8	1.47468E-7
ω	3.27616E-10	1.35801E-10	4.07375E-9	-7.25883E-8	7.80633E-8	-2.54122E-7
M	-7.14569E-9	-2.85794E-9	-1.59691E-8	1.47468E-7	-2.54122E-7	5.54530E-6

Date of computation: 2025-11-24 16:53 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

24.184

Unit

mag

Source

[1]

Slope Parameter (G)

Value

0.15**

Unit

Source

[1]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

0.05 - 0.25

Unit

Source

[2]

Diameter

Value

40 - 90*

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

271

Unit

Source

[1]

Unobserved

Value

1372

Unit

Source

[1]

Normalized RMS of residuals

Value

0.625273

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2021-08-26.37924

Unit

Source

[2]

Last Observation

Value

2022-05-24.260015

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

95 (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 2021QM1 from 1950 to 2126

Body	Date in UTC	Time uncert. in min	Nominal distance in au	Min. possible distance in au	Distance uncert. in au
EARTH	1963-04-06 22:51	12.9	0.1037199	0.1031509	0.0001896
EARTH	1968-09-03 15:27	13.7	0.0470278	0.0464626	0.0001885
EARTH	1985-09-16 04:52	9.9	0.1792708	0.1789415	0.0001098
MARS	1993-09-16 09:39	9.7	0.0449113	0.0444078	0.0001680
MARS	1995-08-06 14:34	11.8	0.0203106	0.0199404	0.0001252
EARTH	1999-03-29 21:40	25.3	0.0655039	0.0644744	0.0003432
EARTH	2016-04-09 04:02	7.3	0.1543064	0.1539746	0.0001106
EARTH	2021-09-06 02:12	< 1 s	0.0179323	0.0179322	0.0000000
EARTH	2038-09-13 04:00	27.6	0.1178881	0.1168461	0.0003473
EARTH	2052-03-22 03:04	50.4	0.1944408	0.1927063	0.0005782
EARTH	2069-04-01 14:08	65.4	0.0166157	0.0139090	0.0009023
EARTH	2086-03-29 11:16	925.1	0.0849786	0.0482034	0.0122586
EARTH	2123-09-12 15:37	> 1 d	0.0768295	0.0142550	0.0335738

Download as:

Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
59.09702202	90.10228001	0.00022950	MINIMUM
300.44455325	243.38833268	0.01501120	MINIMUM
359.52757413	346.43607826	0.48361213	SADDLE
359.48735916	166.36329941	1.51838178	SADDLE
179.91127542	166.91835428	1.53998417	SADDLE
179.90093833	346.91672739	3.54062380	MAXIMUM

Download:

MOID Plots

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