Asteroids

2015XF261 help

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

Orbital Properties

Epoch

61200.0

MJD

Orbit type

Aten

Perihelion (q)

0.674

Aphelion (Q)

1.306

Eccentricity (e)

0.319

Inclination (i)

0.8

deg

Orbit period (P)

359.7

Earth MOID

0.00239

U parameter

1.9

Next Earth close approach

Date

2028-04-06

Nominal distance (from Earth center)

0.14052

21020896

Maximum Brightness

23.1

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

25.1

mag

Diameter

25 - 60*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2015-12-08

Observatory

Pan-STARRS 1, Haleakala

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

0.989895

1-sigma variation

5.252E-8

Unit

Eccentricity (e)

Value

0.319094

1-sigma variation

0.000001

Unit

Inclination (i)

Value

0.7939

1-sigma variation

4.195E-6

Unit

Long. of Ascending Node (Ω)

Value

209.8012

1-sigma variation

0.0003

Unit

Arg. of Perihelion (ω)

Value

100.8834

1-sigma variation

0.0003

Unit

Mean Anomaly (M)

Value

326.41476

1-sigma variation

0.00022

Unit

Perihelion distance

Value

0.674025

1-sigma variation

Unit

Aphelion distance

Value

1.305764

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.059652

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.155782

1-sigma variation

Unit

MOID

Value

0.002394

1-sigma variation

Unit

Orbit Period

Value

359.7345

1-sigma variation

Unit

U parameter

Value

1.9

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	2.75880E-15	-7.23172E-14	-1.08946E-13	2.14103E-12	1.27627E-12	-1.15781E-11
e	-7.23172E-14	1.89628E-12	2.86291E-12	-5.61283E-11	-3.36153E-11	3.03782E-10
i	-1.08946E-13	2.86291E-12	1.75951E-11	7.83273E-10	-9.19071E-10	4.58469E-10
Ω	2.14103E-12	-5.61283E-11	7.83273E-10	6.98354E-8	-6.70911E-8	-9.22998E-9
ω	1.27627E-12	-3.36153E-11	-9.19071E-10	-6.70911E-8	6.86400E-8	-5.24018E-9
M	-1.15781E-11	3.03782E-10	4.58469E-10	-9.22998E-9	-5.24018E-9	4.89619E-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

25.099

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

25 - 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

[-]

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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

2991

Unit

Source

[1]

Unobserved

Value

792

Unit

Source

[1]

Normalized RMS of residuals

Value

0.638711

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2015-12-08.45594

Unit

Source

[2]

Last Observation

Value

2024-02-15.228097

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

74 (5)

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 2015XF261 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	1950-11-22 22:20	1.1	0.0386610	0.0385913	0.0000232
EARTH	1951-11-21 00:58	< 1 min	0.0747962	0.0747269	0.0000231
EARTH	1952-12-04 18:19	7.6	0.1810750	0.1810243	0.0000169
EARTH	1961-04-07 09:38	< 1 s	0.1296979	0.1296973	0.0000002
EARTH	1962-04-10 03:36	< 1 min	0.0206696	0.0206642	0.0000018
EARTH	1963-04-07 11:05	< 1 min	0.0762110	0.0762033	0.0000026
EARTH	1964-04-02 21:46	< 1 s	0.1768006	0.1767910	0.0000032
EARTH	2013-11-25 10:21	< 1 min	0.1221717	0.1221697	0.0000007
EARTH	2014-11-22 14:37	< 1 min	0.0352937	0.0352928	0.0000003
EARTH	2015-11-20 20:37	< 1 min	0.0434080	0.0434074	0.0000002
EARTH	2016-11-22 11:13	< 1 min	0.1257834	0.1257815	0.0000006
EARTH	2017-12-08 16:15	< 1 min	0.1977829	0.1977801	0.0000009
EARTH	2028-04-06 12:27	< 1 min	0.1405160	0.1405138	0.0000007
EARTH	2029-04-10 22:06	< 1 min	0.0446240	0.0446214	0.0000009
EARTH	2030-04-08 18:48	< 1 min	0.0470128	0.0470102	0.0000009
EARTH	2031-04-05 10:40	< 1 min	0.1451459	0.1451439	0.0000007
EARTH	2072-11-25 13:21	< 1 min	0.1141639	0.1141419	0.0000073
EARTH	2073-11-22 07:13	< 1 min	0.0123208	0.0123037	0.0000057
EARTH	2074-11-21 02:24	< 1 min	0.0695996	0.0695984	0.0000004
EARTH	2075-11-27 04:15	1.7	0.1467403	0.1467195	0.0000069
EARTH	2088-04-05 23:42	18.0	0.1496769	0.1494619	0.0000717
EARTH	2089-04-12 04:19	< 1 min	0.0749255	0.0746800	0.0000818
EARTH	2090-04-11 07:41	3.9	0.0022899	0.0021112	0.0000616
EARTH	2091-04-12 07:48	17.3	0.0301531	0.0287021	0.0004837
EARTH	2092-04-12 06:08	13.0	0.0678570	0.0652035	0.0008845
VENUS	2092-06-05 02:37	227.4	0.0225956	0.0208616	0.0006171
EARTH	2093-04-12 02:15	73.2	0.1122216	0.1075911	0.0015435
EARTH	2094-04-06 17:22	507.9	0.1571049	0.1510601	0.0020150
EARTH	2095-03-27 12:24	1089.6	0.1974806	0.1911051	0.0021254
EARTH	2113-11-25 23:30	> 1 d	0.1712974	0.1461418	0.0083885
EARTH	2114-11-17 18:21	994.7	0.1271715	0.0987170	0.0094952
EARTH	2115-11-16 11:37	23.2	0.0777818	0.0507110	0.0090695
EARTH	2116-11-16 11:13	277.5	0.0316361	0.0113746	0.0077406
EARTH	2117-11-17 20:08	214.9	0.0120611	0.0092034	0.0032591
EARTH	2118-11-20 00:10	158.8	0.0640857	0.0539745	0.0033746
EARTH	2119-11-22 13:41	59.2	0.1246004	0.1202971	0.0014344
EARTH	2120-11-24 08:02	43.3	0.1873614	0.1857104	0.0005504

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
267.60446774	97.55486576	0.00243570	MINIMUM
89.60914103	318.28962644	0.00661304	MINIMUM
178.93068466	28.26940514	0.32033681	SADDLE
357.95457313	207.22922619	0.34219916	SADDLE
358.02243303	27.30464997	1.65960016	SADDLE
178.91759920	208.24927518	2.32155727	MAXIMUM

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MOID Plots

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