Asteroids

1998DK36 help

Last update: 2026-07-30 11:21 UTC

Orbital Properties

Epoch

61200.0

MJD

Orbit type

Atira

Perihelion (q)

0.405

Aphelion (Q)

0.980

Eccentricity (e)

0.415

Inclination (i)

2.0

deg

Orbit period (P)

210.6

Earth MOID

0.00835

U parameter

9.0

Next Earth close approach

Date

2028-03-08

Nominal distance (from Earth center)

0.14303

21397576

Maximum Brightness

25.1

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

mag

Diameter

26 - 60*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

1998-02-23

Observatory

Maunakea

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

61200.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

0.692668

1-sigma variation

0.064366

Unit

Eccentricity (e)

Value

0.415178

1-sigma variation

0.019007

Unit

Inclination (i)

Value

2.0489

1-sigma variation

5.2684

Unit

Long. of Ascending Node (Ω)

Value

150.8672

1-sigma variation

27.0332

Unit

Arg. of Perihelion (ω)

Value

180.7236

1-sigma variation

28.5315

Unit

Mean Anomaly (M)

Value

219.79266

1-sigma variation

178.87100

Unit

Perihelion distance

Value

0.405087

1-sigma variation

Unit

Aphelion distance

Value

0.980248

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.008355

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.606411

1-sigma variation

Unit

MOID

Value

0.008352

1-sigma variation

Unit

Orbit Period

Value

210.5647

1-sigma variation

Unit

U parameter

Value

9.0

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	4.14305E-3	-1.21521E-3	3.38745E-1	1.73990E0	-1.83595E0	1.15133E1
e	-1.21521E-3	3.61257E-4	-9.98954E-2	-5.09613E-1	5.37006E-1	-3.37684E0
i	3.38745E-1	-9.98954E-2	2.77564E1	1.42178E2	-1.49944E2	9.41335E2
Ω	1.73990E0	-5.09613E-1	1.42178E2	7.30794E2	-7.71244E2	4.83511E3
ω	-1.83595E0	5.37006E-1	-1.49944E2	-7.71244E2	8.14046E2	-5.10203E3
M	1.15133E1	-3.37684E0	9.41335E2	4.83511E3	-5.10203E3	3.19947E4

Date of computation: 2026-07-30 11:21 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

25.046

Unit

mag

Source

[1]

Slope Parameter (G)

Value

0.15**

Unit

Source

[1]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

0.05 - 0.25

Unit

Source

[2]

Diameter

Value

26 - 60*

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

10426

Unit

Source

[1]

Normalized RMS of residuals

Value

0.0723524

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

1998-02-23.24201

Unit

Source

[2]

Last Observation

Value

1998-02-24.23795

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

4 (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

Filters

Initial Date: *

Final Date: *

Normalised Only accepted

Max residual (arcsec):

* - these fields are required

Plot

Computation parameters

As seen from:

Initial Date: *

Final Date: *

Output option:

One line per time step

Time step:*

* - these fields are required

Note: Ephemerides requests are limited to a maximum of 1000 points and a final date not exceeding 2040/12/31 00:00.

Close Approaches for 1998DK36 from 1950 to 2126

Body	Date in UTC	Time uncert. in min	Nominal distance in au	Min. possible distance in au	Distance uncert. in au
EARTH	1952-03-07 10:19	> 1 mo	0.1319189	0.0000000	6.8483009
EARTH	1956-02-22 20:44	> 1 mo	0.0104532	0.0037921	0.6679153
EARTH	1960-02-02 19:32	> 1 mo	0.0798196	0.0048504	2.2164489
VENUS	1964-05-13 22:40	> 1 w	0.0331699	0.0058683	0.9553224
EARTH	1971-03-08 03:51	> 1 mo	0.1709093	0.0045322	2.7152390
EARTH	1975-03-04 16:57	> 1 mo	0.0439698	0.0000000	3.0769168
MERCURY	1975-12-27 02:44	> 1 mo	0.0485410	0.0467980	0.9044387
EARTH	1979-02-11 09:31	> 1 mo	0.0185433	0.0005246	1.9871789
VENUS	1979-07-19 02:14	> 1 mo	0.0442675	0.0229737	4.4356030
EARTH	1983-02-02 03:02	> 1 w	0.1451616	0.0045285	4.5528111
MERCURY	1986-05-06 16:58	> 1 mo	0.0489560	0.0473327	0.9971045
EARTH	1994-03-07 14:55	> 1 mo	0.0811818	0.0002257	1.4909874
EARTH	1998-02-14 23:37	> 1 d	0.0113395	0.0000826	0.0040479
VENUS	2000-01-18 16:13	> 1 mo	0.0401455	0.0000000	0.9845993
EARTH	2002-02-02 04:27	> 1 w	0.1432854	0.0049518	1.5699057
VENUS	2006-08-11 23:56	> 1 mo	0.0346212	0.0241863	1.4779346
EARTH	2013-03-06 07:08	> 1 mo	0.0579136	0.0006665	5.2612687
EARTH	2017-02-09 20:02	> 1 mo	0.0229717	0.0013209	3.8268599
EARTH	2021-02-02 13:35	> 1 mo	0.1832696	0.0072518	5.3769701
VENUS	2027-02-13 20:18	> 1 w	0.0189394	0.0000000	1.2590446
EARTH	2028-03-08 13:47	> 1 w	0.1430340	0.0136559	0.1798605
EARTH	2032-02-18 04:50	> 1 mo	0.0083912	0.0023537	0.4094765
EARTH	2036-02-03 10:07	> 1 mo	0.1796096	0.0038862	14.3506881
EARTH	2043-03-09 00:31	> 1 mo	0.0860035	0.0027913	23.5091642
EARTH	2047-02-07 06:05	> 1 mo	0.0373902	0.0025132	19.1373885
VENUS	2055-06-02 17:23	> 1 mo	0.0149897	0.0000000	13.4059310
EARTH	2058-03-03 18:46	> 1 mo	0.0310450	0.0011093	7.7463568
EARTH	2062-02-04 03:24	> 1 mo	0.0728593	0.0048664	34.8487623
VENUS	2064-08-24 05:28	> 1 mo	0.0171226	0.0000000	65.3448479
VENUS	2071-03-18 15:46	> 1 mo	0.0392302	0.0272568	47.4707358
EARTH	2073-03-09 04:53	> 1 mo	0.0966948	0.0030125	103.1232539
EARTH	2077-02-15 15:36	> 1 mo	0.0121594	0.0006389	42.5665846
VENUS	2080-06-08 05:52	> 1 mo	0.0445021	0.0278590	230.6682309
EARTH	2081-02-03 11:25	> 1 mo	0.1666162	0.0066536	299.3233247
EARTH	2088-03-09 12:17	> 1 mo	0.1595216	0.0053284	499.3780704
EARTH	2092-02-26 16:32	> 1 mo	0.0137955	0.0004784	179.0103476
EARTH	2096-02-04 23:00	> 1 mo	0.0844284	0.0046913	629.9890840
VENUS	2100-12-12 14:11	> 1 mo	0.0325405	0.0000000	950.6006765
EARTH	2107-03-11 05:14	> 1 mo	0.0991216	0.0080861	40.2903604
VENUS	2110-03-05 01:41	> 1 mo	0.0239838	0.0000000	334.1241249
MERCURY	2110-11-12 16:18	> 1 mo	0.0479865	0.0473655	37.2619975
EARTH	2111-02-18 03:41	> 1 mo	0.0116995	0.0017926	68.4376518
EARTH	2115-02-05 10:10	> 1 mo	0.1503408	0.0022017	638.5091558
VENUS	2116-09-26 20:42	> 1 mo	0.0400877	0.0281566	535.0291802
EARTH	2122-03-11 06:52	> 1 mo	0.1866365	0.0053822	1155.7057832
VENUS	2125-12-18 13:51	> 1 mo	0.0378906	0.0283485	727.0552778
EARTH	2126-03-04 14:14	> 1 mo	0.0267784	0.0009879	727.4227419

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
178.56387879	45.57102202	0.00835194	MINIMUM
356.39958537	223.21917924	0.60677222	SADDLE
356.49171804	43.32634348	1.39345337	SADDLE
178.46049021	225.48931789	1.99186229	MAXIMUM

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MOID Plots

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