Asteroids

2015XX168 help

Last update: 2026-03-17 23:26 UTC

Orbital Properties

Epoch

61200.0

MJD

Orbit type

Aten

Perihelion (q)

0.483

Aphelion (Q)

1.198

Eccentricity (e)

0.425

Inclination (i)

1.0

deg

Orbit period (P)

281.5

Earth MOID

0.00440

U parameter

1.4

Next Earth close approach

Date

2028-10-19

Nominal distance (from Earth center)

0.18905

28281256

Maximum Brightness

23.1

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

25.5

mag

Diameter

21 - 50*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2015-12-08

Observatory

University of Arizona Mt. Lemmon Survey

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

0.840569

1-sigma variation

6.088E-9

Unit

Eccentricity (e)

Value

0.425011

1-sigma variation

0.000002

Unit

Inclination (i)

Value

0.9916

1-sigma variation

1.211E-5

Unit

Long. of Ascending Node (Ω)

Value

281.6619

1-sigma variation

0.0002

Unit

Arg. of Perihelion (ω)

Value

300.1418

1-sigma variation

0.0002

Unit

Mean Anomaly (M)

Value

127.48877

1-sigma variation

0.00026

Unit

Perihelion distance

Value

0.483318

1-sigma variation

Unit

Aphelion distance

Value

1.197820

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.448802

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.108934

1-sigma variation

Unit

MOID

Value

0.004402

1-sigma variation

Unit

Orbit Period

Value

281.4871

1-sigma variation

Unit

U parameter

Value

1.4

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	3.70676E-17	-1.26348E-14	-4.28063E-14	1.79923E-13	-2.00639E-13	-1.54727E-12
e	-1.26348E-14	4.57159E-12	1.64952E-11	-9.47634E-11	1.01393E-10	5.61364E-10
i	-4.28063E-14	1.64952E-11	1.46564E-10	-1.99495E-9	2.01683E-9	2.02889E-9
Ω	1.79923E-13	-9.47634E-11	-1.99495E-9	3.44408E-8	-3.45120E-8	-1.17434E-8
ω	-2.00639E-13	1.01393E-10	2.01683E-9	-3.45120E-8	3.45978E-8	1.25499E-8
M	-1.54727E-12	5.61364E-10	2.02889E-9	-1.17434E-8	1.25499E-8	6.89445E-8

Date of computation: 2026-03-17 23:26 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

25.492

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

21 - 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

[-]

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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

3665

Unit

Source

[1]

Unobserved

Value

166

Unit

Source

[1]

Normalized RMS of residuals

Value

0.616837

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2015-12-08.34573

Unit

Source

[2]

Last Observation

Value

2025-12-20.086468

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

116 (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

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 2015XX168 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	1950-11-04 13:16	41.1	0.0366234	0.0361697	0.0001516
EARTH	1952-12-16 21:16	4.5	0.0943899	0.0939035	0.0001621
EARTH	1958-09-22 09:53	< 1 min	0.0163005	0.0162472	0.0000179
EARTH	1962-12-16 19:13	2.3	0.1247528	0.1245733	0.0000598
EARTH	1968-09-21 22:45	< 1 min	0.0211276	0.0210268	0.0000337
MERCURY	1970-11-08 04:52	11.1	0.0428806	0.0427522	0.0000428
EARTH	1972-12-17 14:15	1.4	0.0833383	0.0831941	0.0000481
MERCURY	1974-09-13 21:33	9.5	0.0338651	0.0338025	0.0000209
MERCURY	1978-07-19 17:24	5.7	0.0292703	0.0292586	0.0000039
EARTH	1978-09-23 13:57	< 1 min	0.0936695	0.0936213	0.0000161
MERCURY	1982-05-25 21:22	1.3	0.0316942	0.0316792	0.0000050
EARTH	1982-12-19 00:32	< 1 min	0.0064003	0.0063872	0.0000044
EARTH	1988-09-22 23:03	< 1 min	0.0507803	0.0507747	0.0000019
EARTH	1992-12-16 15:18	< 1 min	0.1306144	0.1306033	0.0000037
MERCURY	1994-09-07 17:57	< 1 min	0.0273493	0.0273440	0.0000017
EARTH	1995-11-18 20:29	< 1 min	0.1928054	0.1928003	0.0000017
EARTH	1998-09-24 18:07	< 1 min	0.0566797	0.0566666	0.0000043
EARTH	2005-12-06 12:03	< 1 min	0.1379151	0.1379118	0.0000011
MERCURY	2006-12-18 17:29	< 1 min	0.0298340	0.0298328	0.0000004
EARTH	2008-10-08 02:29	1.1	0.1520273	0.1520161	0.0000037
EARTH	2015-12-18 06:19	< 1 s	0.0472582	0.0472573	0.0000003
EARTH	2018-10-22 06:14	1.3	0.1915813	0.1915728	0.0000028
MERCURY	2019-04-05 10:53	< 1 min	0.0333028	0.0332904	0.0000041
EARTH	2021-09-25 11:58	< 1 min	0.1550773	0.1550570	0.0000068
EARTH	2025-12-18 19:17	< 1 s	0.0154640	0.0154637	0.0000001
EARTH	2028-10-19 11:11	1.4	0.1890485	0.1890394	0.0000031
EARTH	2035-12-10 05:43	< 1 min	0.1244534	0.1244528	0.0000002
EARTH	2038-09-30 18:13	1.0	0.1198856	0.1198703	0.0000051
EARTH	2045-11-19 14:10	< 1 min	0.1928328	0.1928289	0.0000013
EARTH	2048-09-22 04:48	< 1 min	0.0169674	0.0169669	0.0000002
MERCURY	2050-01-25 17:25	1.6	0.0459698	0.0459527	0.0000057
EARTH	2052-12-18 04:02	< 1 min	0.0722583	0.0722205	0.0000126
MERCURY	2053-12-04 18:06	4.7	0.0355295	0.0354919	0.0000125
MERCURY	2057-10-12 05:28	7.2	0.0357399	0.0356782	0.0000206
EARTH	2058-09-24 16:19	1.3	0.1271547	0.1270505	0.0000348
MERCURY	2061-08-19 23:17	9.5	0.0347440	0.0346687	0.0000251
EARTH	2062-12-18 13:42	1.7	0.0389740	0.0388666	0.0000358
MERCURY	2065-06-28 16:40	9.5	0.0309718	0.0309380	0.0000113
EARTH	2065-10-14 17:09	10.5	0.1764073	0.1763578	0.0000165
MERCURY	2069-05-07 08:23	7.5	0.0298260	0.0298209	0.0000017
VENUS	2070-12-24 14:45	2.2	0.0465268	0.0465137	0.0000044
EARTH	2072-12-04 22:59	5.5	0.1457273	0.1456900	0.0000125
MERCURY	2073-03-15 13:38	6.9	0.0303012	0.0302794	0.0000073
EARTH	2075-09-27 17:43	3.5	0.0965945	0.0965276	0.0000223
MERCURY	2077-01-22 09:10	6.6	0.0332574	0.0332105	0.0000156
EARTH	2079-12-15 16:51	1.0	0.1902615	0.1902057	0.0000186
MERCURY	2080-11-30 18:31	5.3	0.0366778	0.0366270	0.0000169
VENUS	2082-05-04 16:22	1.4	0.0396349	0.0396197	0.0000051
EARTH	2082-11-17 11:58	5.1	0.1966232	0.1966161	0.0000024
MERCURY	2084-10-08 00:22	4.7	0.0354554	0.0354129	0.0000142
EARTH	2085-09-22 14:42	< 1 min	0.0197108	0.0196798	0.0000103
EARTH	2089-12-19 04:58	< 1 min	0.0432463	0.0431589	0.0000291
EARTH	2095-09-26 19:42	1.6	0.1819808	0.1818875	0.0000311
EARTH	2099-12-13 02:31	3.6	0.1095640	0.1095157	0.0000161
EARTH	2102-10-03 05:29	4.0	0.1262084	0.1261604	0.0000160
EARTH	2109-11-18 10:34	1.3	0.1974763	0.1974748	0.0000005
EARTH	2112-09-23 13:22	< 1 min	0.0324808	0.0324724	0.0000028
EARTH	2116-12-20 08:02	< 1 min	0.0140699	0.0140335	0.0000121
EARTH	2119-10-28 16:24	7.1	0.1995402	0.1995266	0.0000045
EARTH	2122-09-26 22:10	2.0	0.1460647	0.1459010	0.0000546
EARTH	2126-12-20 10:44	2.4	0.0227346	0.0224696	0.0000883

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
246.15303910	345.86537849	0.00439991	MINIMUM
117.38207521	259.44194286	0.01666189	MINIMUM
181.40050838	302.28477031	0.20561113	SADDLE
3.60108663	124.66532232	0.52796377	SADDLE
3.55213574	304.62058488	1.47360326	SADDLE
181.51021710	122.36676639	2.20643507	MAXIMUM

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MOID Plots

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