Asteroids

2021JR7 help

Last update: 2025-07-29 02:36 UTC

Orbital Properties

Epoch

60800.0

MJD

Orbit type

Apollo

Perihelion (q)

1.008

Aphelion (Q)

1.175

Eccentricity (e)

0.076

Inclination (i)

8.9

deg

Orbit period (P)

416.5

Earth MOID

0.00534

U parameter

6.0

Next Earth close approach

Date

2029-05-04

Nominal distance (from Earth center)

0.10063

15053777

Maximum Brightness

23.4

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

25.4

mag

Diameter

22 - 50*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2021-05-14

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

60800.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

1.091397

1-sigma variation

0.000035

Unit

Eccentricity (e)

Value

0.076483

1-sigma variation

0.000028

Unit

Inclination (i)

Value

8.8659

1-sigma variation

0.0024

Unit

Long. of Ascending Node (Ω)

Value

234.2739

1-sigma variation

0.0001

Unit

Arg. of Perihelion (ω)

Value

332.3857

1-sigma variation

0.0050

Unit

Mean Anomaly (M)

Value

197.16706

1-sigma variation

0.06587

Unit

Perihelion distance

Value

1.007923

1-sigma variation

Unit

Aphelion distance

Value

1.174871

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.005391

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.174992

1-sigma variation

Unit

MOID

Value

0.005341

1-sigma variation

Unit

Orbit Period

Value

416.4593

1-sigma variation

Unit

U parameter

Value

6.0

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	1.21350E-9	9.87143E-10	8.21082E-8	-3.13760E-9	1.73371E-7	-2.29448E-6
e	9.87143E-10	8.03016E-10	6.67944E-8	-2.55235E-9	1.41022E-7	-1.86649E-6
i	8.21082E-8	6.67944E-8	5.55667E-6	-2.12302E-7	1.17271E-5	-1.55247E-4
Ω	-3.13760E-9	-2.55235E-9	-2.12302E-7	8.12126E-9	-4.48242E-7	5.93256E-6
ω	1.73371E-7	1.41022E-7	1.17271E-5	-4.48242E-7	2.47874E-5	-3.27826E-4
M	-2.29448E-6	-1.86649E-6	-1.55247E-4	5.93256E-6	-3.27826E-4	4.33843E-3

Date of computation: 2025-07-29 02:36 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

25.38

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

22 - 50*

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

0.766735

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2021-05-14.278246

Unit

Source

[2]

Last Observation

Value

2021-05-30.444734

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

84 (2)

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 2021JR7 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	1953-01-09 03:43	> 1 w	0.1673646	0.1670729	0.0022350
EARTH	1953-05-19 01:33	> 1 d	0.0387034	0.0037896	0.0441788
EARTH	1969-11-28 14:49	> 1 d	0.1632629	0.1621743	0.0004102
EARTH	1978-05-09 20:49	> 1 d	0.0576568	0.0011382	0.0199005
EARTH	1986-11-10 17:33	> 1 d	0.1720342	0.1711182	0.0005450
EARTH	1995-05-10 14:23	903.1	0.0515983	0.0314987	0.0067025
EARTH	2003-11-29 16:07	> 1 d	0.1577195	0.1575495	0.0001916
EARTH	2012-10-08 14:32	> 1 d	0.1976900	0.1967990	0.0003277
EARTH	2021-05-16 07:48	< 1 min	0.0138694	0.0138581	0.0000038
EARTH	2029-05-04 00:53	270.9	0.1006283	0.0935459	0.0023614
EARTH	2045-11-08 15:32	> 1 d	0.1796628	0.1784751	0.0004575
EARTH	2053-12-08 10:31	> 1 d	0.1663641	0.1663464	0.0000447
EARTH	2062-01-18 05:12	> 1 d	0.1737709	0.1736966	0.0000868
EARTH	2062-05-18 23:23	436.6	0.0390889	0.0293268	0.0032575
EARTH	2070-05-18 08:42	1426.6	0.0336121	0.0046041	0.0100792
EARTH	2077-12-10 12:56	> 1 w	0.1759692	0.1755052	0.0015931
EARTH	2085-11-09 11:33	> 1 w	0.1900424	0.1873869	0.0074336
EARTH	2101-05-03 21:29	> 1 w	0.1042209	0.0095195	0.1109278
EARTH	2109-05-18 06:32	> 1 d	0.0264544	0.0039761	0.0622250
EARTH	2116-11-15 18:03	> 1 mo	0.1911299	0.1883593	0.0567436
EARTH	2124-04-23 23:20	> 1 mo	0.1795662	0.0303448	0.9531892

Download as:

Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
25.42023120	131.10119763	0.00534111	MINIMUM
236.74469617	337.62141408	0.16773229	MINIMUM
280.27207681	19.81749657	0.17399714	SADDLE
141.26068516	249.39224351	0.21221938	SADDLE
8.33604452	292.78101488	2.00162552	SADDLE
191.66134027	116.14560957	2.17957963	MAXIMUM

Download:

MOID Plots

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