Asteroids

2015XY261 help

Last update: 2025-05-03 13:42 UTC

Orbital Properties

Epoch

60800.0

MJD

Orbit type

Apollo

Perihelion (q)

0.800

Aphelion (Q)

2.190

Eccentricity (e)

0.465

Inclination (i)

1.6

deg

Orbit period (P)

667.7

Earth MOID

0.00172

U parameter

7.0

Next Earth close approach

Date

2025-05-10

Nominal distance (from Earth center)

0.16821

25163559

Maximum Brightness

26.1

mag

Risk

Object is not in risk list

Object is not in priority list

Physical Properties

Absolute Magnitude (H)

mag

Diameter

10 - 23*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2015-12-06

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

60800.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

1.495043

1-sigma variation

0.000246

Unit

Eccentricity (e)

Value

0.464629

1-sigma variation

0.000114

Unit

Inclination (i)

Value

1.5899

1-sigma variation

0.0001

Unit

Long. of Ascending Node (Ω)

Value

86.8907

1-sigma variation

0.0018

Unit

Arg. of Perihelion (ω)

Value

61.9803

1-sigma variation

0.0027

Unit

Mean Anomaly (M)

Value

24.56193

1-sigma variation

0.53644

Unit

Perihelion distance

Value

0.800403

1-sigma variation

Unit

Aphelion distance

Value

2.189682

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.021047

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.481726

1-sigma variation

Unit

MOID

Value

0.001722

1-sigma variation

Unit

Orbit Period

Value

667.6960

1-sigma variation

Unit

U parameter

Value

7.0

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	6.04314E-8	2.80659E-8	1.38653E-8	4.44301E-7	-6.74250E-7	-1.31873E-4
e	2.80659E-8	1.30345E-8	6.44091E-9	2.06339E-7	-3.13125E-7	-6.12451E-5
i	1.38653E-8	6.44091E-9	3.43815E-9	1.00899E-7	-1.53313E-7	-3.02569E-5
Ω	4.44301E-7	2.06339E-7	1.00899E-7	3.27093E-6	-4.96293E-6	-9.69551E-4
ω	-6.74250E-7	-3.13125E-7	-1.53313E-7	-4.96293E-6	7.53178E-6	1.47134E-3
M	-1.31873E-4	-6.12451E-5	-3.02569E-5	-9.69551E-4	1.47134E-3	2.87772E-1

Date of computation: 2025-03-29 00:36 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

27.049

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

10 - 23*

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

3427

Unit

Source

[1]

Normalized RMS of residuals

Value

0.415089

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2015-12-06.45988

Unit

Source

[2]

Last Observation

Value

2015-12-15.37345

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

41 (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

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 2015XY261 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	1951-05-02 23:44	> 1 mo	0.0808429	0.0164631	0.7185842
EARTH	1952-12-05 07:48	> 1 mo	0.1233295	0.0025822	0.6948895
EARTH	1964-05-08 21:30	> 1 d	0.1851237	0.0890804	0.0321408
EARTH	1965-12-12 16:58	> 1 d	0.0226629	0.0022149	0.0705612
EARTH	1977-04-25 02:33	> 1 d	0.0236971	0.0165659	0.0144509
EARTH	1990-02-14 04:31	> 1 w	0.1855413	0.1788017	0.0022601
EARTH	2003-01-02 05:52	> 1 d	0.1113555	0.0576516	0.0179170
MARS	2008-12-21 09:33	545.6	0.0407436	0.0289756	0.0076371
EARTH	2015-12-15 13:50	< 1 s	0.0019276	0.0019261	0.0000005
EARTH	2025-05-10 11:14	1290.8	0.1682080	0.1186428	0.0165742
EARTH	2036-04-27 04:07	> 1 d	0.0258222	0.0208899	0.0206728
EARTH	2047-02-25 14:23	> 1 mo	0.1889642	0.1656920	0.0082383
EARTH	2057-12-22 19:54	> 1 mo	0.0634717	0.0021144	0.2165672
EARTH	2068-12-03 04:15	> 1 d	0.1779046	0.0014358	0.0877824
EARTH	2078-04-26 12:14	> 1 d	0.0352708	0.0207965	0.0438710
EARTH	2089-02-18 22:08	> 1 mo	0.1896846	0.1789270	0.0041247
MARS	2097-12-17 22:50	> 1 d	0.0477468	0.0200907	0.1806013
EARTH	2099-12-16 16:59	> 1 w	0.0049281	0.0009760	0.2387435
EARTH	2111-04-16 14:58	> 1 mo	0.0949413	0.0211755	36.6457405
EARTH	2124-01-13 16:22	> 1 mo	0.1382393	0.0098567	43.7840282

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
317.32010412	341.20063875	0.00172202	MINIMUM
45.45524664	115.23410718	0.02094297	MINIMUM
1.83213820	48.78386521	0.18980305	SADDLE
180.63472389	227.32486559	1.17920206	SADDLE
1.70688073	228.56073440	1.81118340	SADDLE
180.58121234	47.28534307	3.17823261	MAXIMUM

Download:

MOID Plots

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