Asteroids

2021JQ2 help

Last update: 2024-04-19 00:31 UTC

Orbital Properties

Epoch

60400.0

MJD

Orbit type

Aten

Perihelion (q)

0.769

Aphelion (Q)

1.161

Eccentricity (e)

0.203

Inclination (i)

9.8

deg

Orbit period (P)

346.4

Earth MOID

0.00029

U parameter

5.6

Next Earth close approach

Date

2036-12-12

Nominal distance (from Earth center)

0.12253

18330974

Maximum Brightness

29.3

mag

Risk

Object is not in risk list

Object is not in priority list

Physical Properties

Absolute Magnitude (H)

29.9

mag

Diameter

2.7 - 6*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2021-05-07

Observatory

Mt. Lemmon Survey

Orbit Visualiser

Click the button to start Orbit Visualiser

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

60400.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

0.965253

1-sigma variation

0.000014

Unit

Eccentricity (e)

Value

0.202979

1-sigma variation

0.000026

Unit

Inclination (i)

Value

9.7563

1-sigma variation

0.0006

Unit

Long. of Ascending Node (Ω)

Value

47.8043

1-sigma variation

1.826E-5

Unit

Arg. of Perihelion (ω)

Value

294.0416

1-sigma variation

0.0040

Unit

Mean Anomaly (M)

Value

287.51784

1-sigma variation

0.02257

Unit

Perihelion distance

Value

0.769327

1-sigma variation

Unit

Aphelion distance

Value

1.161179

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.134746

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.000469

1-sigma variation

Unit

MOID

Value

0.000290

1-sigma variation

Unit

Orbit Period

Value

346.3859

1-sigma variation

Unit

U parameter

Value

5.6

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	1.96424E-10	-3.59049E-10	-8.78263E-9	-2.46270E-10	-5.58084E-8	-3.16262E-7
e	-3.59049E-10	6.70038E-10	1.66709E-8	4.33184E-10	1.01943E-7	5.79812E-7
i	-8.78263E-9	1.66709E-8	4.20696E-7	1.02315E-8	2.49218E-6	1.42177E-5
Ω	-2.46270E-10	4.33184E-10	1.02315E-8	3.33474E-10	7.00563E-8	3.94402E-7
ω	-5.58084E-8	1.01943E-7	2.49218E-6	7.00563E-8	1.58567E-5	8.98482E-5
M	-3.16262E-7	5.79812E-7	1.42177E-5	3.94402E-7	8.98482E-5	5.09426E-4

Date of computation: 2024-02-21 14:29 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

29.937

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

2.7 - 6*

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 ODIM	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

0.9

Unit

Source

[1]

Unobserved

Value

1077

Unit

Source

[1]

Normalized RMS of residuals

Value

0.822148

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2021-05-07.373168

Unit

Source

[2]

Last Observation

Value

2021-05-08.253663

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

36 (4)

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

[3]

Last Observation

Value

Unit

Source

[3]

Delay (Discarded)

Value

0 (0)

Unit

Source

[1]

Doppler (Discarded)

Value

0 (0)

Unit

Source

[1]

Total Radar Observations (Discarded)

Value

0 (0)

Unit

Source

[1]

Note: The ASCII file is in a format suitable for Orbfit input.

Sources

No.	Name	Additional
[1]	ESA ODIM	ESA orbit determination and impact monitoring system
[2]	MPC	Minor Planet Center: https://www.minorplanetcenter.net
[3]	JPL Radar Observations	Jet Propulsion Laboratory: https://ssd.jpl.nasa.gov/dat/radar_data_ast.txt

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 2021JQ2 from 1950 to 2124

Body	Date in UTC	Time uncert. in min	Nominal distance in au	Min. possibile distance in au	Distance uncert. in au
VENUS	1952-12-28 09:07	> 1 d	0.0187418	0.0099280	0.0156876
EARTH	1954-03-09 19:29	> 1 d	0.1801646	0.1771891	0.0013130
EARTH	1960-04-08 05:40	> 1 d	0.1498092	0.1321129	0.0059970
EARTH	1966-05-02 22:37	726.0	0.0742314	0.0621139	0.0040404
VENUS	1968-05-22 18:55	479.3	0.0262204	0.0212590	0.0016600
EARTH	1972-05-05 02:11	950.3	0.0540193	0.0301268	0.0079643
EARTH	1978-05-03 11:19	> 1 d	0.0716641	0.0226429	0.0163645
EARTH	1984-04-29 05:21	> 1 d	0.0933146	0.0459015	0.0159239
EARTH	1990-04-21 12:33	> 1 d	0.1223310	0.0914275	0.0104589
EARTH	1996-04-07 03:34	> 1 d	0.1535437	0.1422947	0.0038246
VENUS	2000-12-28 06:41	18.9	0.0195791	0.0194068	0.0000581
EARTH	2002-03-09 10:31	933.9	0.1845833	0.1837309	0.0002848
VENUS	2005-04-21 09:51	1231.6	0.0387528	0.0147578	0.0084036
EARTH	2008-01-13 04:43	472.3	0.1407380	0.1358735	0.0019412
EARTH	2015-05-09 01:38	1.8	0.0076164	0.0071988	0.0001392
EARTH	2021-05-08 10:46	< 1 s	0.0004490	0.0004489	0.0000000
EARTH	2036-12-12 19:42	189.4	0.1225350	0.1185068	0.0013743
EARTH	2039-05-07 20:05	165.2	0.0876648	0.0815060	0.0020531
EARTH	2055-11-25 20:49	247.6	0.1119018	0.1104753	0.0004830
EARTH	2058-05-07 07:42	17.1	0.0607449	0.0591587	0.0005288
EARTH	2073-12-04 12:47	317.1	0.0907598	0.0903447	0.0001968
EARTH	2076-05-07 23:24	61.1	0.0116778	0.0047065	0.0023312
EARTH	2090-11-10 19:51	> 1 mo	0.1607538	0.1227389	0.0541192
EARTH	2092-05-02 14:43	> 1 w	0.1193741	0.0175563	0.0845182
EARTH	2106-12-10 06:18	> 1 d	0.0961792	0.0949103	0.0115314
EARTH	2109-05-08 14:53	> 1 d	0.0484791	0.0013687	0.0605712
EARTH	2122-12-20 04:09	> 1 w	0.1651231	0.1013151	0.1328391

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