Asteroids

2015WP2 help

Last update: 2025-09-10 00:30 UTC

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Apollo

Perihelion (q)

0.779

Aphelion (Q)

2.092

Eccentricity (e)

0.457

Inclination (i)

1.7

deg

Orbit period (P)

628.3

Earth MOID

0.00051

U parameter

6.7

Next Earth close approach

Date

2046-10-07

Nominal distance (from Earth center)

0.19855

29702044

Maximum Brightness

35.1

mag

Risk

Object is in risk list

Physical Properties

Absolute Magnitude (H)

30.3

mag

Diameter

2.3 - 5*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2015-11-21

Observatory

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

61000.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

1.435693

1-sigma variation

0.000034

Unit

Eccentricity (e)

Value

0.457124

1-sigma variation

0.000190

Unit

Inclination (i)

Value

1.7136

1-sigma variation

0.0050

Unit

Long. of Ascending Node (Ω)

Value

57.9543

1-sigma variation

0.0779

Unit

Arg. of Perihelion (ω)

Value

287.9501

1-sigma variation

0.0603

Unit

Mean Anomaly (M)

Value

323.20012

1-sigma variation

0.78736

Unit

Perihelion distance

Value

0.779403

1-sigma variation

Unit

Aphelion distance

Value

2.091982

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.006660

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.309775

1-sigma variation

Unit

MOID

Value

0.000508

1-sigma variation

Unit

Orbit Period

Value

628.3341

1-sigma variation

Unit

U parameter

Value

6.7

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	1.16956E-9	6.47835E-9	1.71204E-7	2.66325E-6	-2.05974E-6	-2.69246E-5
e	6.47835E-9	3.59267E-8	9.48658E-7	1.47593E-5	-1.14199E-5	-1.49201E-4
i	1.71204E-7	9.48658E-7	2.50649E-5	3.89913E-4	-3.01597E-4	-3.94181E-3
Ω	2.66325E-6	1.47593E-5	3.89913E-4	6.06583E-3	-4.69216E-3	-6.13218E-2
ω	-2.05974E-6	-1.14199E-5	-3.01597E-4	-4.69216E-3	3.63020E-3	4.74335E-2
M	-2.69246E-5	-1.49201E-4	-3.94181E-3	-6.13218E-2	4.74335E-2	6.19929E-1

Date of computation: 2025-09-10 00:30 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

30.328

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

2.3 - 5*

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

3585

Unit

Source

[1]

Normalized RMS of residuals

Value

0.536976

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2015-11-21.19581

Unit

Source

[2]

Last Observation

Value

2015-11-23.203902

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

40 (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 2015WP2 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	1957-11-21 02:05	> 1 w	0.0320627	0.0005570	0.2286216
EARTH	1962-11-06 04:17	> 1 mo	0.1130025	0.0012048	0.3345894
MARS	1967-04-29 00:32	> 1 d	0.0377220	0.0036106	0.3063246
EARTH	1982-06-25 13:27	> 1 w	0.0823764	0.0128867	0.2303609
EARTH	1987-06-12 14:11	> 1 w	0.0797438	0.0131920	0.2162234
VENUS	2005-10-22 03:36	> 1 w	0.0496724	0.0400280	0.0047957
EARTH	2015-11-20 01:42	< 1 min	0.0015362	0.0015337	0.0000008
MARS	2021-04-17 16:44	418.5	0.0335538	0.0066750	0.0125615
EARTH	2022-06-26 06:28	> 1 d	0.0467679	0.0163781	0.0204994
EARTH	2046-10-07 10:17	> 1 d	0.1985459	0.1784047	0.0067174
EARTH	2053-06-12 15:46	837.0	0.1523779	0.1179733	0.0114875
EARTH	2058-11-20 13:37	565.9	0.0079969	0.0002756	0.0043079
MARS	2067-01-20 03:12	> 1 d	0.0420644	0.0060672	0.1685166
EARTH	2072-06-27 17:51	> 1 mo	0.0517832	0.0169591	0.3013211
EARTH	2084-11-29 10:44	> 1 w	0.1592609	0.0010152	0.1388608
MARS	2089-08-15 05:38	> 1 d	0.0110431	0.0066070	0.0175077
EARTH	2091-10-15 13:53	> 1 d	0.1817513	0.1799829	0.0005905
EARTH	2098-07-27 09:13	> 1 mo	0.1774963	0.0166309	0.0743412
EARTH	2105-06-12 16:13	> 1 w	0.1926013	0.0163783	0.2542972
EARTH	2117-10-16 02:39	> 1 mo	0.1823752	0.0145662	0.3734212
EARTH	2124-07-21 19:35	> 1 mo	0.1608211	0.0151455	0.6199134

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
47.04830127	315.33729649	0.00048316	MINIMUM
309.64164309	168.27142928	0.01654940	MINIMUM
357.82232180	241.17753574	0.22955858	SADDLE
179.20614627	62.80605357	1.10010737	SADDLE
357.95099127	61.37383790	1.77144703	SADDLE
179.22916144	242.81413649	3.09880010	MAXIMUM

Download:

MOID Plots

Click on the images to zoom-in and zoom-out

Level lines of the squared distance function

2015WP2

Date in UTC	MJD	σ	Distance ± Width in RE	Stretching in RE	IP	Impact energy	PS
2077-11-20.138	79992.138	4.307	1.17 ± 0.005	7.63E5	6.25E-11	1.62E-3	-12.64
2081-11-19.816	81452.816	-1.397	1.12 ± 0.002	3.49E6	6.21E-8	1.60E-3	-9.68
2082-11-20.350	81818.350	-2.087	0.29 ± 0.004	8.33E3	1.42E-5	1.60E-3	-7.33
2082-11-20.377	81818.377	-2.052	0.98 ± 0.002	1.18E4	7.51E-6	1.60E-3	-7.60
2089-11-19.678	84374.678	-1.607	0.91 ± 0.009	9.16E4	3.15E-6	1.60E-3	-8.03
2089-11-19.927	84374.927	1.845	0.98 ± 0.004	4.71E3	2.81E-5	1.61E-3	-7.08
2089-11-20.092	84375.092	-2.073	0.63 ± 0.001	6.76E5	1.67E-7	1.60E-3	-9.30
2089-11-20.101	84375.101	-2.063	0.79 ± 0.003	7.88E5	1.30E-7	1.59E-3	-9.41
2089-11-20.176	84375.176	4.284	1.04 ± 0.001	1.54E5	5.03E-10	1.62E-3	-11.82
2094-11-20.224	86201.224	1.855	0.27 ± 0.004	2.48E6	7.53E-8	1.61E-3	-9.68
2096-11-19.720	86931.720	1.827	0.22 ± 0.004	8.79E5	2.25E-7	1.61E-3	-9.21
2098-11-20.316	87662.316	1.838	1.30 ± 0.004	8.46E6	6.15E-9	1.61E-3	-10.79
2098-11-20.572	87662.572	-2.587	0.89 ± 0.006	1.13E7	2.67E-9	1.60E-3	-11.15
2101-11-21.134	88758.134	0.626	0.90 ± 0.011	7.34E7	9.48E-9	1.60E-3	-10.62
2101-11-21.214	88758.214	1.928	1.21 ± 0.000	5.54E4	1.25E-6	1.62E-3	-8.50
2102-11-21.497	89123.497	-2.788	0.98 ± 0.003	4.25E6	4.74E-9	1.60E-3	-10.93
2103-11-21.511	89488.511	1.848	1.08 ± 0.000	4.82E7	3.41E-9	1.61E-3	-11.07
2106-11-21.330	90584.330	1.870	0.82 ± 0.005	1.37E6	1.27E-7	1.61E-3	-9.52
2107-11-21.534	90949.534	1.851	0.58 ± 0.003	1.83E7	9.45E-9	1.61E-3	-10.65
2111-11-22.040	92411.040	-2.867	1.33 ± 0.004	3.48E6	1.17E-9	1.59E-3	-11.58
2114-11-21.543	93506.543	-3.302	0.91 ± 0.028	2.55E5	1.31E-8	1.60E-3	-10.55
2115-11-21.905	93871.905	4.601	0.55 ± 0.008	3.67E5	6.68E-11	1.62E-3	-12.84
2116-11-21.129	94237.129	-3.236	1.03 ± 0.023	1.29E6	3.63E-9	1.60E-3	-11.11
2119-11-22.245	95333.245	-4.670	0.59 ± 0.021	2.53E5	6.97E-11	1.59E-3	-12.84
2120-11-20.608	95697.608	-1.603	0.66 ± 0.010	9.36E6	2.79E-8	1.60E-3	-10.24


Based on 40 optical observations (of which 0 are rejected as outliers) from 2015/11/21.196 to 2015/11/23.204.
Coordinates are given on the Target Plane.
Unit is one Earth radius, but impact cross section has radius between 1.34 and 1.34 Earth radii.
Coordinates for LOV = EQU scaled= 1 second= F.
AstOD software version= 4.0, Date of computation=20250805 130500.123 UTC.

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