Asteroids

415713 1998XX2 help

Last update: 2026-07-30 09:40 UTC

Orbital Properties

Epoch

61200.0

MJD

Orbit type

Aten

Perihelion (q)

0.469

Aphelion (Q)

1.013

Eccentricity (e)

0.368

Inclination (i)

7.0

deg

Orbit period (P)

233.0

Earth MOID

0.01619

U parameter

0.2

Next Earth close approach

Date

2028-11-28

Nominal distance (from Earth center)

0.02023

3027098

Maximum Brightness

14.5

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

19.9

mag

Diameter

270 - 600*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

1998-12-08

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

61200.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

0.740982

1-sigma variation

1.225E-9

Unit

Eccentricity (e)

Value

0.367591

1-sigma variation

7.783E-8

Unit

Inclination (i)

Value

6.9728

1-sigma variation

1.361E-5

Unit

Long. of Ascending Node (Ω)

Value

74.3453

1-sigma variation

3.430E-5

Unit

Arg. of Perihelion (ω)

Value

153.0785

1-sigma variation

3.837E-5

Unit

Mean Anomaly (M)

Value

260.42268

1-sigma variation

0.00004

Unit

Perihelion distance

Value

0.468604

1-sigma variation

Unit

Aphelion distance

Value

1.013361

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.032251

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.531897

1-sigma variation

Unit

MOID

Value

0.016191

1-sigma variation

Unit

Orbit Period

Value

232.9755

1-sigma variation

Unit

U parameter

Value

0.2

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	1.50010E-18	1.35313E-17	-4.79120E-15	9.52783E-15	-2.25317E-14	2.28208E-14
e	1.35313E-17	6.05777E-15	3.88059E-13	-2.93632E-13	-7.75101E-13	2.62534E-12
i	-4.79120E-15	3.88059E-13	1.85317E-10	-3.36984E-10	2.78551E-10	1.99640E-10
Ω	9.52783E-15	-2.93632E-13	-3.36984E-10	1.17616E-9	-1.10227E-9	-5.71477E-11
ω	-2.25317E-14	-7.75101E-13	2.78551E-10	-1.10227E-9	1.47218E-9	-7.53078E-10
M	2.28208E-14	2.62534E-12	1.99640E-10	-5.71477E-11	-7.53078E-10	1.84121E-9

Date of computation: 2026-07-30 09:40 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

19.941

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

270 - 600*

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

9491

Unit

Source

[1]

Unobserved

Value

675

Unit

Source

[1]

Normalized RMS of residuals

Value

0.848384

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

1998-12-08.07121

Unit

Source

[2]

Last Observation

Value

2024-12-02.05876

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

441 (21)

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):

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Plot

Computation parameters

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Initial Date: *

Final Date: *

Output option:

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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 415713 1998XX2 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
MERCURY	1951-05-13 02:33	< 1 min	0.0491923	0.0491882	0.0000014
MERCURY	1953-03-31 02:36	< 1 min	0.0366964	0.0366941	0.0000008
EARTH	1954-11-29 19:40	< 1 min	0.0181123	0.0181120	0.0000001
EARTH	1961-11-12 19:42	< 1 min	0.0602020	0.0602013	0.0000002
MERCURY	1964-02-07 20:26	< 1 min	0.0281306	0.0281305	0.0000000
EARTH	1968-10-25 00:21	< 1 min	0.0908681	0.0908667	0.0000005
EARTH	1975-10-20 12:32	< 1 min	0.1573548	0.1573517	0.0000010
MERCURY	1976-11-07 23:10	< 1 min	0.0312332	0.0312315	0.0000006
EARTH	1977-12-04 03:04	< 1 min	0.1691911	0.1691871	0.0000013
EARTH	1984-12-04 09:10	< 1 min	0.0702491	0.0702460	0.0000010
MERCURY	1987-09-20 17:01	< 1 min	0.0317557	0.0317548	0.0000003
EARTH	1991-11-30 11:26	< 1 min	0.0169654	0.0169652	0.0000001
MERCURY	1998-07-23 17:56	< 1 min	0.0327594	0.0327589	0.0000002
EARTH	1998-11-18 12:45	< 1 min	0.0499994	0.0499990	0.0000001
EARTH	2005-10-30 23:41	< 1 min	0.0785125	0.0785120	0.0000001
MERCURY	2011-04-20 06:13	< 1 min	0.0289568	0.0289567	0.0000001
EARTH	2012-10-20 14:17	< 1 min	0.1355977	0.1355972	0.0000002
EARTH	2014-12-03 22:04	< 1 min	0.1962346	0.1962342	0.0000001
EARTH	2021-12-04 21:24	< 1 min	0.0771310	0.0771306	0.0000002
MERCURY	2024-01-25 09:52	< 1 min	0.0281967	0.0281966	0.0000001
EARTH	2028-11-28 01:31	< 1 min	0.0202349	0.0202347	0.0000001
EARTH	2035-11-03 00:58	< 1 min	0.0749558	0.0749555	0.0000001
MERCURY	2036-11-02 04:42	< 1 min	0.0280411	0.0280411	0.0000000
VENUS	2039-04-08 13:22	< 1 min	0.0346547	0.0346542	0.0000002
EARTH	2042-10-21 00:20	< 1 min	0.1472001	0.1471988	0.0000004
VENUS	2043-05-01 02:59	< 1 min	0.0482177	0.0482169	0.0000003
EARTH	2044-12-04 00:08	< 1 min	0.1748047	0.1748024	0.0000008
MERCURY	2051-07-10 12:34	< 1 min	0.0288538	0.0288530	0.0000003
EARTH	2051-12-03 22:31	< 1 min	0.0362013	0.0361981	0.0000011
EARTH	2058-11-20 14:30	< 1 min	0.0444374	0.0444365	0.0000003
MERCURY	2064-04-12 05:05	< 1 min	0.0335141	0.0335135	0.0000002
EARTH	2065-10-28 11:22	< 1 min	0.0842859	0.0842852	0.0000002
EARTH	2072-10-20 16:33	< 1 min	0.1596439	0.1596401	0.0000012
VENUS	2073-02-06 20:50	< 1 min	0.0375782	0.0375762	0.0000007
EARTH	2074-12-04 18:07	< 1 min	0.1672231	0.1672170	0.0000020
MERCURY	2077-01-18 16:38	< 1 min	0.0289833	0.0289813	0.0000007
VENUS	2077-03-01 01:19	< 1 min	0.0475568	0.0475550	0.0000006
EARTH	2081-12-04 09:44	< 1 min	0.0553898	0.0553778	0.0000040
MERCURY	2087-12-01 08:48	1.2	0.0355961	0.0355859	0.0000034
EARTH	2088-11-26 22:45	1.0	0.0228554	0.0228472	0.0000027
VENUS	2090-04-30 21:15	< 1 min	0.0363963	0.0363949	0.0000005
VENUS	2094-05-23 04:01	< 1 min	0.0484730	0.0484689	0.0000014
EARTH	2095-11-03 05:54	1.7	0.0738505	0.0738444	0.0000020
MERCURY	2102-07-31 15:06	3.5	0.0304707	0.0304565	0.0000047
EARTH	2102-10-22 15:13	< 1 min	0.1457299	0.1457049	0.0000083
EARTH	2104-12-05 02:46	< 1 min	0.1787640	0.1787263	0.0000126
EARTH	2111-12-05 14:51	< 1 min	0.0479402	0.0479082	0.0000107
MERCURY	2115-05-12 06:00	2.9	0.0268823	0.0268815	0.0000002
EARTH	2118-11-25 10:05	< 1 min	0.0323747	0.0323706	0.0000014
VENUS	2124-03-01 23:41	< 1 min	0.0391438	0.0391381	0.0000019
EARTH	2125-11-01 01:35	1.9	0.0786552	0.0786459	0.0000031

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
209.62161351	324.02335215	0.01619095	MINIMUM
2.79591399	125.61085650	0.54202948	SADDLE
3.56928124	306.79940058	1.45872996	SADDLE
182.36301805	125.56922622	2.02213754	MAXIMUM

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MOID Plots

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