Asteroids

2004SW26 help

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

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Aten

Perihelion (q)

0.431

Aphelion (Q)

1.045

Eccentricity (e)

0.416

Inclination (i)

18.4

deg

Orbit period (P)

231.5

Earth MOID

0.04086

U parameter

8.5

Next Earth close approach

Date

2030-10-02

Nominal distance (from Earth center)

0.07968

11919888

Maximum Brightness

22.3

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

2004-09-23

Observatory

LPL/Spacewatch II

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

0.737886

1-sigma variation

0.000315

Unit

Eccentricity (e)

Value

0.415943

1-sigma variation

0.000816

Unit

Inclination (i)

Value

18.4120

1-sigma variation

0.0597

Unit

Long. of Ascending Node (Ω)

Value

180.2493

1-sigma variation

0.0044

Unit

Arg. of Perihelion (ω)

Value

359.5356

1-sigma variation

0.0478

Unit

Mean Anomaly (M)

Value

323.53900

1-sigma variation

7.00933

Unit

Perihelion distance

Value

0.430967

1-sigma variation

Unit

Aphelion distance

Value

1.044805

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.566273

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.040896

1-sigma variation

Unit

MOID

Value

0.040860

1-sigma variation

Unit

Orbit Period

Value

231.5168

1-sigma variation

Unit

U parameter

Value

8.5

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	9.91400E-8	-2.56981E-7	-1.86582E-5	-1.37045E-6	1.35189E-5	-2.20694E-3
e	-2.56981E-7	6.66126E-7	4.83783E-5	3.55304E-6	-3.50064E-5	5.72052E-3
i	-1.86582E-5	4.83783E-5	3.56964E-3	2.60737E-4	-2.38512E-3	4.14970E-1
Ω	-1.37045E-6	3.55304E-6	2.60737E-4	1.90809E-5	-1.79172E-4	3.04892E-2
ω	1.35189E-5	-3.50064E-5	-2.38512E-3	-1.79172E-4	2.28485E-3	-3.01985E-1
M	-2.20694E-3	5.72052E-3	4.14970E-1	3.04892E-2	-3.01985E-1	4.91307E1

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

25.387

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

1.0

Unit

Source

[1]

Unobserved

Value

7660

Unit

Source

[1]

Normalized RMS of residuals

Value

0.853997

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2004-09-23.41381

Unit

Source

[2]

Last Observation

Value

2004-09-24.38129

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

26 (1)

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 2004SW26 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	1952-09-11 02:11	> 1 d	0.1133047	0.0668882	0.0910851
EARTH	1959-09-22 23:17	> 1 w	0.0417287	0.0415538	0.0066581
MERCURY	1960-09-08 10:47	> 1 d	0.0325165	0.0261142	0.1047744
EARTH	1966-10-04 19:54	> 1 d	0.1023767	0.0648534	0.0634878
EARTH	1971-09-09 11:53	> 1 d	0.1645758	0.0821113	0.0722028
MERCURY	1972-09-23 09:58	> 1 d	0.0422151	0.0250306	0.1267900
EARTH	1978-09-17 09:48	> 1 d	0.0600285	0.0475045	0.0355329
MERCURY	1984-10-08 21:37	> 1 d	0.0417962	0.0253554	0.0867828
EARTH	1985-09-29 18:42	> 1 d	0.0634293	0.0492931	0.0282987
EARTH	1992-10-08 04:19	1129.9	0.1709120	0.0955773	0.0316261
EARTH	1997-09-12 14:21	> 1 d	0.0982803	0.0636544	0.0153477
EARTH	2004-09-24 03:54	5.4	0.0425024	0.0421785	0.0001080
EARTH	2011-10-06 16:29	> 1 d	0.1215296	0.0803644	0.0165438
EARTH	2016-09-09 15:04	> 1 d	0.1423909	0.0781591	0.0301673
EARTH	2023-09-19 22:28	> 1 d	0.0486775	0.0437237	0.0192062
MERCURY	2025-12-18 12:03	> 1 d	0.0482688	0.0233976	0.0981792
EARTH	2030-10-02 10:29	> 1 d	0.0796795	0.0554353	0.0464355
EARTH	2035-09-09 02:40	1055.8	0.1965493	0.0908849	0.0804865
EARTH	2037-10-09 02:10	1372.5	0.1951511	0.0938476	0.0835403
MERCURY	2038-01-02 11:55	> 1 w	0.0406338	0.0249568	0.1341138
EARTH	2042-09-14 13:48	> 1 w	0.0811420	0.0553537	0.0645001
EARTH	2049-09-26 11:20	> 1 w	0.0475733	0.0431865	0.0352354
MERCURY	2050-01-18 02:04	> 1 w	0.0430300	0.0245790	0.1584631
EARTH	2056-10-07 02:02	> 1 d	0.1382724	0.0777576	0.0962874
EARTH	2061-09-10 16:26	> 1 d	0.1276254	0.0714735	0.0996679
MERCURY	2062-02-01 17:27	> 1 w	0.0313038	0.0266910	0.1205746
EARTH	2068-09-20 13:04	> 1 w	0.0442565	0.0422403	0.0313798
MERCURY	2074-02-17 07:48	> 1 w	0.0333221	0.0266253	0.1708036
EARTH	2075-10-03 20:55	> 1 w	0.0890197	0.0595948	0.1051069
EARTH	2080-09-08 14:27	> 1 d	0.1872649	0.0878063	0.1632281
MERCURY	2086-03-04 15:34	> 1 w	0.0316346	0.0267432	0.1900153
EARTH	2087-09-15 09:45	> 1 w	0.0765032	0.0533657	0.1229853
EARTH	2094-09-27 07:57	> 1 w	0.0498855	0.0440730	0.0791280
MERCURY	2098-03-20 09:36	> 1 w	0.0357054	0.0262115	0.2804910
EARTH	2101-10-08 13:03	> 1 w	0.1400585	0.0790953	0.1934047
EARTH	2106-09-12 00:24	> 1 w	0.1280804	0.0710376	0.2019403
MERCURY	2110-04-05 21:21	> 1 w	0.0364074	0.0262864	0.3217485
EARTH	2113-09-21 14:43	> 1 w	0.0446196	0.0422801	0.0649699
EARTH	2120-10-03 18:52	> 1 w	0.0858943	0.0584443	0.1905531
MERCURY	2122-04-21 21:08	> 1 w	0.0450260	0.0247705	0.4650321
EARTH	2125-09-09 22:08	> 1 d	0.1950307	0.0888004	0.2916411

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
180.26174975	258.61272623	0.04163649	MINIMUM
10.41016509	90.77503022	0.56713191	SADDLE
5.77503102	263.94216841	1.43348709	SADDLE
181.75237783	79.51866114	2.04140695	MAXIMUM

Download:

MOID Plots

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