Asteroids

1993DA help

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

Orbital Properties

Epoch

60800.0

MJD

Orbit type

Aten

Perihelion (q)

0.849

Aphelion (Q)

1.023

Eccentricity (e)

0.093

Inclination (i)

12.4

deg

Orbit period (P)

330.7

Earth MOID

0.03354

U parameter

6.8

Next Earth close approach

Date

2031-02-08

Nominal distance (from Earth center)

0.10939

16364609

Maximum Brightness

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

26.3

mag

Diameter

14 - 30*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

1993-02-17

Observatory

Steward Observatory, Kitt Peak-Spacewatch

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

0.935878

1-sigma variation

0.000065

Unit

Eccentricity (e)

Value

0.093074

1-sigma variation

0.000160

Unit

Inclination (i)

Value

12.3967

1-sigma variation

0.0187

Unit

Long. of Ascending Node (Ω)

Value

329.0031

1-sigma variation

0.0015

Unit

Arg. of Perihelion (ω)

Value

353.9384

1-sigma variation

0.0566

Unit

Mean Anomaly (M)

Value

37.12045

1-sigma variation

1.12123

Unit

Perihelion distance

Value

0.848772

1-sigma variation

Unit

Aphelion distance

Value

1.022983

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.161835

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.033745

1-sigma variation

Unit

MOID

Value

0.033543

1-sigma variation

Unit

Orbit Period

Value

330.6945

1-sigma variation

Unit

U parameter

Value

6.8

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	4.21889E-9	-1.03891E-8	-1.21344E-6	-9.47351E-8	3.66057E-6	-7.28261E-5
e	-1.03891E-8	2.55914E-8	2.99081E-6	2.33445E-7	-9.01669E-6	1.79338E-4
i	-1.21344E-6	2.99081E-6	3.50340E-4	2.73234E-5	-1.05047E-3	2.09430E-2
Ω	-9.47351E-8	2.33445E-7	2.73234E-5	2.13168E-6	-8.20789E-5	1.63514E-3
ω	3.66057E-6	-9.01669E-6	-1.05047E-3	-8.20789E-5	3.20065E-3	-6.32193E-2
M	-7.28261E-5	1.79338E-4	2.09430E-2	1.63514E-3	-6.32193E-2	1.25716E0

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

26.326

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

14 - 30*

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

11862

Unit

Source

[1]

Normalized RMS of residuals

Value

1.18599

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

1993-02-17.38782

Unit

Source

[2]

Last Observation

Value

1993-02-22.36914

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

24 (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 1993DA 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	1954-08-29 08:04	> 1 d	0.1602400	0.1602299	0.0000211
EARTH	1955-03-03 03:41	312.3	0.1643803	0.1470512	0.0058405
EARTH	1964-02-04 08:47	593.4	0.1467503	0.1306531	0.0054527
EARTH	1973-09-22 12:39	> 1 d	0.1760431	0.1726720	0.0013180
EARTH	1974-02-22 22:32	579.1	0.0535447	0.0442671	0.0034814
EARTH	1983-08-04 23:54	1366.0	0.1771094	0.1759725	0.0004258
EARTH	1992-10-01 18:18	107.5	0.1880658	0.1875953	0.0001569
EARTH	1993-02-19 03:38	< 1 min	0.0341027	0.0339497	0.0000510
EARTH	2002-08-11 06:54	1364.4	0.1706061	0.1689974	0.0005918
EARTH	2011-10-07 14:42	> 1 d	0.1942724	0.1909938	0.0012653
EARTH	2012-02-17 18:39	675.0	0.0386567	0.0350409	0.0019903
EARTH	2021-08-22 07:08	> 1 d	0.1620926	0.1613290	0.0012386
EARTH	2022-03-04 04:38	406.2	0.1968528	0.1586473	0.0129517
EARTH	2031-02-08 03:52	> 1 d	0.1093907	0.0660761	0.0165882
EARTH	2040-09-12 09:11	> 1 w	0.1663465	0.1643908	0.0032667
EARTH	2041-02-26 00:08	> 1 d	0.0913432	0.0467345	0.0189799
EARTH	2050-07-29 15:49	> 1 d	0.1840473	0.1775784	0.0039224
EARTH	2059-09-29 11:36	> 1 d	0.1842682	0.1796247	0.0018996
EARTH	2060-02-20 14:23	820.5	0.0361730	0.0343829	0.0019135
EARTH	2069-08-07 18:08	> 1 d	0.1738097	0.1698272	0.0020558
EARTH	2078-10-03 04:52	> 1 d	0.1894819	0.1830280	0.0032488
EARTH	2079-02-18 18:44	> 1 d	0.0346980	0.0344908	0.0012661
EARTH	2088-08-11 18:47	> 1 w	0.1696487	0.1664569	0.0085902
EARTH	2097-10-10 19:17	> 1 w	0.1987172	0.1896445	0.0231387
EARTH	2098-02-15 09:39	> 1 w	0.0484669	0.0365084	0.0496793
EARTH	2107-08-28 20:35	> 1 mo	0.1607153	0.1606428	0.0030897
EARTH	2108-03-03 03:56	> 1 d	0.1663562	0.0627547	0.1073166
EARTH	2117-02-03 22:33	> 1 w	0.1461175	0.0695622	0.1076935

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
187.76929801	47.09462885	0.03354300	MINIMUM
11.72148215	234.30736786	0.16066155	MINIMUM
85.01545424	311.69400324	0.21472576	SADDLE
292.07607178	147.42484456	0.23105592	SADDLE
349.86569512	30.51350699	1.83504122	SADDLE
176.40662921	217.08437550	2.03540918	MAXIMUM

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MOID Plots

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