Asteroids

2021RH12 help

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

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Apollo

Perihelion (q)

0.903

Aphelion (Q)

1.381

Eccentricity (e)

0.209

Inclination (i)

3.7

deg

Orbit period (P)

445.8

Earth MOID

0.00120

U parameter

6.6

Next Earth close approach

Date

2032-09-10

Nominal distance (from Earth center)

0.07901

11819966

Maximum Brightness

25.8

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

28.4

mag

Diameter

6 - 12*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2021-09-11

Observatory

Pan-STARRS 2, Haleakala

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

1.142149

1-sigma variation

0.000097

Unit

Eccentricity (e)

Value

0.209273

1-sigma variation

0.000120

Unit

Inclination (i)

Value

3.7286

1-sigma variation

0.0029

Unit

Long. of Ascending Node (Ω)

Value

174.2465

1-sigma variation

0.0011

Unit

Arg. of Perihelion (ω)

Value

246.7711

1-sigma variation

0.0054

Unit

Mean Anomaly (M)

Value

105.61456

1-sigma variation

0.14861

Unit

Perihelion distance

Value

0.903128

1-sigma variation

Unit

Aphelion distance

Value

1.381170

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.194888

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.003195

1-sigma variation

Unit

MOID

Value

0.001199

1-sigma variation

Unit

Orbit Period

Value

445.8437

1-sigma variation

Unit

U parameter

Value

6.6

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	9.32565E-9	1.15180E-8	2.64598E-7	-2.73080E-8	3.79443E-7	-1.43489E-5
e	1.15180E-8	1.43805E-8	3.36966E-7	-2.11098E-8	5.14330E-7	-1.77559E-5
i	2.64598E-7	3.36966E-7	8.17803E-6	6.02332E-8	1.37719E-5	-4.09349E-4
Ω	-2.73080E-8	-2.11098E-8	6.02332E-8	1.14366E-6	2.62253E-6	3.92283E-5
ω	3.79443E-7	5.14330E-7	1.37719E-5	2.62253E-6	2.89369E-5	-5.93808E-4
M	-1.43489E-5	-1.77559E-5	-4.09349E-4	3.92283E-5	-5.93808E-4	2.20852E-2

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

28.417

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 - 12*

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

[-]

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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

1509

Unit

Source

[1]

Normalized RMS of residuals

Value

0.435011

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2021-09-11.291146

Unit

Source

[2]

Last Observation

Value

2021-09-13.16979

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

18 (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 2021RH12 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	1957-12-20 23:39	> 1 mo	0.1048561	0.0655812	0.0161614
EARTH	1971-02-06 03:07	353.8	0.0716874	0.0572445	0.0054056
EARTH	1976-09-13 05:06	> 1 d	0.0547552	0.0000023	0.0313822
EARTH	1989-09-28 15:35	> 1 d	0.0505710	0.0029499	0.0181831
EARTH	2003-01-25 15:48	> 1 d	0.0753826	0.0498883	0.0106345
EARTH	2008-09-04 14:43	648.2	0.1889135	0.1565961	0.0107729
EARTH	2016-02-10 12:57	343.5	0.1382658	0.1216175	0.0056014
EARTH	2021-09-18 22:24	2.7	0.0029280	0.0029221	0.0000020
EARTH	2032-09-10 14:36	824.5	0.0790116	0.0535478	0.0084880
EARTH	2050-01-28 13:48	180.0	0.0741197	0.0716745	0.0008273
EARTH	2061-01-21 07:49	884.8	0.0552534	0.0511428	0.0019735
EARTH	2071-12-14 05:34	> 1 w	0.0969098	0.0821602	0.0054117
EARTH	2082-10-31 23:14	> 1 w	0.0922417	0.0662851	0.0093903
EARTH	2083-02-27 03:47	> 1 w	0.1990949	0.1470875	0.0183612
EARTH	2093-10-09 00:13	> 1 w	0.0670976	0.0250376	0.0143602
EARTH	2104-10-04 21:27	> 1 d	0.0586113	0.0330971	0.0085268
EARTH	2115-11-03 02:51	> 1 w	0.0925057	0.0710027	0.0076106
EARTH	2116-02-26 08:06	> 1 w	0.1963736	0.1522041	0.0154551

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
305.01117384	254.15831351	0.00156080	MINIMUM
52.26302869	21.00604547	0.05102856	MINIMUM
1.48594974	321.23567027	0.10161453	SADDLE
179.00313864	137.48220673	0.37572962	SADDLE
356.80629792	135.53481531	1.91420672	SADDLE
177.65725264	316.39388372	2.36799541	MAXIMUM

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MOID Plots

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