Asteroids

232691 2004AR1 help

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

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Apollo

Perihelion (q)

0.836

Aphelion (Q)

2.316

Eccentricity (e)

0.469

Inclination (i)

9.1

deg

Orbit period (P)

722.7

Earth MOID

0.03175

U parameter

0.0

Next Earth close approach

Date

2098-12-21

Nominal distance (from Earth center)

0.14591

21827663

Maximum Brightness

18.4

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

19.8

mag

Diameter

290 - 600*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2004-01-13

Observatory

Lincoln Laboratory ETS, New Mexico

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

1.576061

1-sigma variation

1.611E-9

Unit

Eccentricity (e)

Value

0.469456

1-sigma variation

7.742E-9

Unit

Inclination (i)

Value

9.0756

1-sigma variation

6.727E-6

Unit

Long. of Ascending Node (Ω)

Value

336.4974

1-sigma variation

1.985E-5

Unit

Arg. of Perihelion (ω)

Value

50.3242

1-sigma variation

2.052E-5

Unit

Mean Anomaly (M)

Value

45.94591

1-sigma variation

4.057E-6

Unit

Perihelion distance

Value

0.836170

1-sigma variation

Unit

Aphelion distance

Value

2.315953

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.065186

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.763918

1-sigma variation

Unit

MOID

Value

0.031755

1-sigma variation

Unit

Orbit Period

Value

722.7000

1-sigma variation

Unit

U parameter

Value

0.0

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	2.59453E-18	-4.62730E-19	8.85369E-16	-1.73394E-15	1.33192E-15	-6.06176E-15
e	-4.62730E-19	5.99317E-17	-1.35697E-15	-2.99239E-15	2.38889E-14	-5.65735E-15
i	8.85369E-16	-1.35697E-15	4.52536E-11	-8.45537E-11	8.63624E-11	-6.01014E-12
Ω	-1.73394E-15	-2.99239E-15	-8.45537E-11	3.93987E-10	-4.03604E-10	2.75525E-11
ω	1.33192E-15	2.38889E-14	8.63624E-11	-4.03604E-10	4.20897E-10	-2.93136E-11
M	-6.06176E-15	-5.65735E-15	-6.01014E-12	2.75525E-11	-2.93136E-11	1.64597E-11

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

[1]

Taxonomy (all)

Value

Unit

Source

[2]

Absolute Magnitude (H)
Slope Parameter (G)

H / G

Value

Unit

Source

Absolute Magnitude (H)

Value

19.821

Unit

mag

Source

[3]

Slope Parameter (G)

Value

0.15**

Unit

mag

Source

[3]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

0.05 - 0.25

Unit

Source

[4]

Diameter

Value

290 - 600*

Unit

Source

[4]

Color Index Information

Color Index Information

Value

Unit

Source

Color Index Information

Value

-0.155

0.0158

-0.139

Unit

i-z

r-i

r-z

Source

[1]

Sightings

Sightings

Value

Unit

Source

Sightings

Value

Radar R

Unit

Source

[5]

Download this part as:

Sources

No.	Name	Additional
[1]	EARN	1.) A. V. Sergeyev, B. Carry et al A&A, 658 (2022) A109
[2]	EARN	Earth Asteroids Research Node: https://earn.dlr.de
[3]	ESA Aegis	ESA orbit determination and impact monitoring system
[4]	Estimation	Estimated from absolute magnitude
[5]	EARN	1.) href="http://echo.jpl.nasa.gov/asteroids/index.html">JPL's NEO Radar Detection Program Webpage

Observational Information

Arc Length
Unobserved
Normalized RMS of residuals

Arc Information

Value

Unit

Source

Arc Length

Value

7362

Unit

Source

[1]

Unobserved

Value

606

Unit

Source

[1]

Normalized RMS of residuals

Value

0.601929

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2004-01-13.23153

Unit

Source

[2]

Last Observation

Value

2024-03-10.7239

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

368 (5)

Unit

Source

[1]

Radar Summary

First Observation
Last Observation
Delay (Discarded)
Doppler (Discarded)
Total Optical Observations (Discarded)

Radar

Value

Unit

Source

First Observation

Value

2013-08-26

Unit

Source

[3]

Last Observation

Value

2013-09-01

Unit

Source

[3]

Delay (Discarded)

Value

2 (0)

Unit

Source

[1]

Doppler (Discarded)

Value

2 (0)

Unit

Source

[1]

Total Radar Observations (Discarded)

Value

4 (0)

Unit

Source

[1]

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
[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 232691 2004AR1 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
MARS	1972-08-04 23:03	< 1 min	0.0267766	0.0267761	0.0000002
EARTH	2003-12-27 16:46	< 1 s	0.1798355	0.1798352	0.0000001
EARTH	2005-12-16 11:10	< 1 min	0.1498290	0.1498287	0.0000001
EARTH	2007-11-16 21:38	< 1 min	0.1900620	0.1900617	0.0000001
EARTH	2009-10-15 13:21	< 1 min	0.1917629	0.1917627	0.0000001
EARTH	2011-09-17 13:57	< 1 s	0.1443569	0.1443568	0.0000000
EARTH	2013-08-25 02:32	< 1 s	0.0542977	0.0542977	0.0000000
EARTH	2015-08-13 15:36	< 1 s	0.0748144	0.0748142	0.0000001
EARTH	2017-08-04 12:35	< 1 s	0.1917051	0.1917049	0.0000001
EARTH	2098-12-21 12:26	< 1 min	0.1459089	0.1459086	0.0000001
EARTH	2100-11-30 19:52	< 1 min	0.1775409	0.1775400	0.0000003
EARTH	2102-10-29 03:41	< 1 min	0.1981338	0.1981336	0.0000001
EARTH	2104-09-30 10:17	< 1 min	0.1710433	0.1710423	0.0000003
EARTH	2106-09-04 23:37	< 1 min	0.0996550	0.0996532	0.0000006
EARTH	2108-08-19 15:23	< 1 min	0.0305910	0.0305902	0.0000003
EARTH	2110-08-09 14:42	< 1 min	0.1439933	0.1439900	0.0000011

Download as:

Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
321.44074277	224.96486332	0.03115795	MINIMUM
38.64018511	345.57941020	0.14725215	MINIMUM
5.97218144	295.20611450	0.19769115	SADDLE
180.28161446	104.00181382	1.32503931	SADDLE
358.67357380	103.11898291	1.83664150	SADDLE
178.86100442	283.14788686	3.30667670	MAXIMUM

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MOID Plots

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