Asteroids

2021JB help

Last update: 2025-04-09 07:59 UTC

Orbital Properties

Epoch

60800.0

MJD

Orbit type

Aten

Perihelion (q)

0.663

Aphelion (Q)

1.199

Eccentricity (e)

0.287

Inclination (i)

6.7

deg

Orbit period (P)

328.1

Earth MOID

0.01173

U parameter

4.6

Next Earth close approach

Date

2030-05-07

Nominal distance (from Earth center)

0.10681

15978764

Maximum Brightness

23.7

mag

Risk

Object is not in risk list

Object is not in priority list

Physical Properties

Absolute Magnitude (H)

26.6

mag

Diameter

13 - 28*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2021-05-01

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

60800.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

0.930984

1-sigma variation

0.000002

Unit

Eccentricity (e)

Value

0.287455

1-sigma variation

0.000161

Unit

Inclination (i)

Value

6.6813

1-sigma variation

0.0052

Unit

Long. of Ascending Node (Ω)

Value

42.7382

1-sigma variation

0.0004

Unit

Arg. of Perihelion (ω)

Value

51.9596

1-sigma variation

0.0006

Unit

Mean Anomaly (M)

Value

263.33110

1-sigma variation

0.01509

Unit

Perihelion distance

Value

0.663368

1-sigma variation

Unit

Aphelion distance

Value

1.198600

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.265899

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.029741

1-sigma variation

Unit

MOID

Value

0.011728

1-sigma variation

Unit

Orbit Period

Value

328.1041

1-sigma variation

Unit

U parameter

Value

4.6

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	4.55288E-12	-2.80582E-10	-9.15017E-9	-7.54874E-10	1.31832E-9	2.10803E-8
e	-2.80582E-10	2.58640E-8	8.37709E-7	6.89688E-8	-8.31428E-8	-2.35540E-6
i	-9.15017E-9	8.37709E-7	2.71385E-5	2.23427E-6	-2.71245E-6	-7.61014E-5
Ω	-7.54874E-10	6.89688E-8	2.23427E-6	1.84018E-7	-2.23878E-7	-6.26078E-6
ω	1.31832E-9	-8.31428E-8	-2.71245E-6	-2.23878E-7	3.84589E-7	6.33503E-6
M	2.10803E-8	-2.35540E-6	-7.61014E-5	-6.26078E-6	6.33503E-6	2.27760E-4

Date of computation: 2025-04-09 07:59 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

26.625

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

13 - 28*

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

1515

Unit

Source

[1]

Normalized RMS of residuals

Value

0.578738

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2021-05-01.405662

Unit

Source

[2]

Last Observation

Value

2021-05-08.34603

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

41 (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 2021JB 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	1951-04-28 21:37	27.5	0.0356749	0.0351628	0.0001707
EARTH	1952-08-31 03:47	117.6	0.1465624	0.1431804	0.0011393
EARTH	1960-05-07 21:42	983.1	0.1092370	0.1014901	0.0025890
EARTH	1961-08-28 03:47	196.8	0.1238745	0.1190704	0.0017430
EARTH	1977-04-29 22:32	3.6	0.1030340	0.1026542	0.0001266
EARTH	1978-07-30 17:48	147.3	0.1871195	0.1864354	0.0002280
EARTH	1986-04-29 13:18	150.3	0.0415064	0.0348747	0.0022308
EARTH	1987-08-31 20:05	71.8	0.1096114	0.1091321	0.0002012
EARTH	1995-06-03 05:08	554.8	0.1806841	0.1788694	0.0006055
VENUS	1998-09-19 10:15	72.0	0.0437320	0.0429767	0.0002768
EARTH	2003-05-03 10:45	20.8	0.1927864	0.1913661	0.0004734
EARTH	2012-04-27 23:29	4.5	0.0321281	0.0315069	0.0002074
EARTH	2013-08-27 11:45	152.4	0.1559597	0.1542176	0.0005823
EARTH	2021-04-28 03:18	< 1 min	0.0148747	0.0148443	0.0000101
VENUS	2021-12-03 07:05	112.1	0.0396076	0.0384216	0.0003995
EARTH	2022-09-02 08:35	19.7	0.1257104	0.1246517	0.0003552
EARTH	2030-05-07 02:10	33.0	0.1068114	0.1063283	0.0001611
EARTH	2031-08-29 09:19	26.2	0.1169666	0.1167089	0.0000881
EARTH	2039-06-06 19:38	111.0	0.1884218	0.1877517	0.0002234
EARTH	2047-05-03 02:17	27.8	0.1888531	0.1867290	0.0007081
VENUS	2055-02-13 08:23	76.6	0.0441832	0.0431986	0.0003303
EARTH	2056-04-28 00:14	5.0	0.0189095	0.0170827	0.0006249
EARTH	2057-09-03 13:47	42.7	0.1424282	0.1416552	0.0002579
EARTH	2065-04-29 05:53	192.7	0.0461716	0.0386984	0.0025071
EARTH	2066-09-02 03:46	152.7	0.1125389	0.1100239	0.0009506
EARTH	2074-05-14 15:26	267.4	0.1336630	0.1324137	0.0004166
EARTH	2075-08-28 07:05	36.1	0.1361962	0.1352647	0.0003149
EARTH	2083-06-13 14:57	788.7	0.1979293	0.1964277	0.0005021
VENUS	2088-05-12 17:52	926.7	0.0399285	0.0336635	0.0021903
EARTH	2091-05-03 04:59	146.0	0.1862986	0.1763308	0.0033230
EARTH	2100-04-30 04:25	135.7	0.0822545	0.0719751	0.0034307
EARTH	2101-08-07 07:04	1166.4	0.1803827	0.1780526	0.0007823
EARTH	2101-09-28 10:16	1073.5	0.1873166	0.1834693	0.0012990
EARTH	2109-04-29 08:35	64.8	0.0142441	0.0097936	0.0019941
VENUS	2110-01-24 21:53	513.6	0.0423525	0.0417533	0.0005553
EARTH	2110-09-03 03:50	245.8	0.1170084	0.1125446	0.0016272
EARTH	2118-05-31 17:32	> 1 d	0.1755853	0.1645838	0.0037027
VENUS	2121-07-25 17:29	1429.5	0.0356707	0.0245573	0.0091797

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
107.47158711	114.73581316	0.01170987	MINIMUM
258.52761312	236.42069119	0.10851969	MINIMUM
186.44050176	177.40501884	0.20987775	SADDLE
3.51218763	357.43347494	0.32834964	SADDLE
0.15789632	173.03378238	1.67822983	SADDLE
179.04796972	351.81569516	2.17913891	MAXIMUM

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MOID Plots

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