Asteroids

2015KG158 help

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

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Apollo

Perihelion (q)

0.823

Aphelion (Q)

1.454

Eccentricity (e)

0.277

Inclination (i)

2.2

deg

Orbit period (P)

443.7

Earth MOID

0.00024

U parameter

6.9

Next Earth close approach

Date

2026-01-26

Nominal distance (from Earth center)

0.15163

22683817

Maximum Brightness

33.2

mag

Risk

Object is in risk list

Physical Properties

Absolute Magnitude (H)

28.4

mag

Diameter

6 - 12*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2015-05-23

Observatory

Cerro Tololo-DECam

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

1.138566

1-sigma variation

0.000111

Unit

Eccentricity (e)

Value

0.276830

1-sigma variation

0.000215

Unit

Inclination (i)

Value

2.2347

1-sigma variation

0.0006

Unit

Long. of Ascending Node (Ω)

Value

53.9739

1-sigma variation

0.0706

Unit

Arg. of Perihelion (ω)

Value

97.5712

1-sigma variation

0.0601

Unit

Mean Anomaly (M)

Value

290.22900

1-sigma variation

0.67941

Unit

Perihelion distance

Value

0.823377

1-sigma variation

Unit

Aphelion distance

Value

1.453755

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.102521

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.001576

1-sigma variation

Unit

MOID

Value

0.000241

1-sigma variation

Unit

Orbit Period

Value

443.7472

1-sigma variation

Unit

U parameter

Value

6.9

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	1.23415E-8	2.32894E-8	-4.94861E-8	7.83684E-6	-6.60758E-6	-7.54736E-5
e	2.32894E-8	4.62036E-8	-7.71598E-8	1.49559E-5	-1.28795E-5	-1.42729E-4
i	-4.94861E-8	-7.71598E-8	3.18255E-7	-3.02135E-5	2.35335E-5	3.00433E-4
Ω	7.83684E-6	1.49559E-5	-3.02135E-5	4.98879E-3	-4.22624E-3	-4.79482E-2
ω	-6.60758E-6	-1.28795E-5	2.35335E-5	-4.22624E-3	3.61241E-3	4.04636E-2
M	-7.54736E-5	-1.42729E-4	3.00433E-4	-4.79482E-2	4.04636E-2	4.61594E-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

28.418

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

6 - 12*

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

3830

Unit

Source

[1]

Normalized RMS of residuals

Value

0.26913

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2015-05-20.97691

Unit

Source

[2]

Last Observation

Value

2015-05-24.03004

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

16 (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 2015KG158 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
MARS	1950-11-10 12:02	> 1 d	0.0100510	0.0080525	0.0102239
EARTH	1955-05-21 23:47	> 1 d	0.1532557	0.0659058	0.0291181
MARS	1968-01-10 04:01	> 1 d	0.0405217	0.0106344	0.0138808
EARTH	1971-11-26 21:33	952.6	0.1142886	0.0697918	0.0148742
EARTH	1977-12-02 03:12	21.5	0.0202456	0.0176430	0.0008994
MARS	1980-12-28 18:14	> 1 d	0.0340303	0.0243032	0.0032756
EARTH	1983-11-29 17:24	1368.5	0.0643605	0.0184134	0.0159568
EARTH	1989-11-24 10:33	1291.6	0.1549010	0.0963978	0.0195258
MARS	1994-02-24 02:28	> 1 d	0.0232082	0.0076333	0.0093383
MARS	2007-05-04 15:39	> 1 d	0.0400889	0.0281289	0.0040157
EARTH	2009-05-19 21:27	707.0	0.0892643	0.0618310	0.0091444
EARTH	2015-05-15 01:53	2.4	0.0056299	0.0056174	0.0000042
MARS	2024-06-10 11:30	> 1 d	0.0211131	0.0097119	0.0067545
EARTH	2026-01-26 06:04	> 1 w	0.1516320	0.1367623	0.0049571
EARTH	2032-05-17 02:42	> 1 d	0.0454022	0.0002258	0.0184930
EARTH	2036-11-27 20:20	231.9	0.1652367	0.1645155	0.0002405
EARTH	2043-03-10 03:52	> 1 w	0.1646239	0.1513785	0.0044370
MARS	2045-02-26 21:56	> 1 d	0.0417109	0.0095814	0.0234676
EARTH	2053-12-12 04:26	> 1 w	0.0469670	0.0138823	0.0563317
EARTH	2060-05-15 02:00	> 1 d	0.0164369	0.0004868	0.0201003
EARTH	2064-12-07 11:07	> 1 w	0.0251516	0.0152630	0.1531400
EARTH	2071-05-16 04:44	> 1 w	0.0121821	0.0003559	0.0669455
EARTH	2075-12-24 08:04	> 1 mo	0.0861654	0.0129571	1.0013251
EARTH	2087-04-29 15:11	> 1 mo	0.0902502	0.0048007	2.7409811
EARTH	2091-12-09 16:03	> 1 mo	0.0255744	0.0161245	2.5423505
EARTH	2098-05-26 10:09	> 1 mo	0.1748355	0.0064025	2.3841481
EARTH	2103-01-27 12:19	> 1 mo	0.1454478	0.0070306	2.3078276
EARTH	2114-03-29 03:26	> 1 mo	0.1468887	0.0296460	5.0197732
EARTH	2118-12-01 07:06	> 1 mo	0.1836480	0.0149972	16.7044340
EARTH	2125-05-18 14:21	> 1 mo	0.0297084	0.0011061	17.4754839

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
66.03877743	130.23160686	0.00050302	MINIMUM
298.68046163	333.28388525	0.01407396	MINIMUM
2.76013656	52.10721567	0.16966701	SADDLE
181.64597338	231.07231772	0.44573675	SADDLE
3.13447722	232.58109370	1.83334096	SADDLE
181.74342042	51.13589243	2.44262928	MAXIMUM

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MOID Plots

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

Level lines of the squared distance function

2015KG158

Date in UTC	MJD	σ	Distance ± Width in RE	Stretching in RE	IP	Impact energy	PS
2045-05-13.759	68113.759	-2.103	1.32 ± 0.053	8.31E5	1.42E-7	1.22E-2	-8.17
2048-05-13.966	69209.966	-1.672	0.50 ± 0.396	2.78E6	1.21E-7	1.21E-2	-8.29
2049-05-14.077	69575.077	-2.189	1.43 ± 0.036	1.40E7	5.37E-9	1.22E-2	-9.67
2049-11-15.791	69760.791	-2.056	0.55 ± 0.008	6.88E6	2.37E-8	1.22E-2	-9.04
2051-05-14.655	70305.655	-2.118	1.36 ± 0.049	7.11E5	1.35E-7	1.21E-2	-8.30
2059-05-14.611	73227.611	-1.856	1.23 ± 0.055	3.57E6	5.06E-8	1.22E-2	-8.84
2059-05-14.771	73227.771	-1.685	0.76 ± 0.067	7.34E5	4.26E-7	1.22E-2	-7.92
2060-05-13.964	73592.964	-1.646	1.76 ± 0.052	6.82E5	6.12E-8	1.22E-2	-8.77
2061-05-13.573	73957.573	-2.323	0.45 ± 0.030	5.06E5	1.86E-7	1.22E-2	-8.30
2061-05-14.033	73958.033	-2.023	0.82 ± 0.000	1.03E7	1.74E-8	1.22E-2	-9.33
2067-05-14.248	76149.248	0.869	1.25 ± 0.041	2.90E6	2.35E-7	1.22E-2	-8.27
2068-05-13.633	76514.633	0.864	0.26 ± 0.370	1.94E7	4.81E-8	1.22E-2	-8.97
2069-05-14.102	76880.102	-1.903	0.27 ± 0.757	2.31E6	8.83E-8	1.21E-2	-8.71
2071-05-14.895	77610.895	-0.121	1.06 ± 0.091	5.33E3	2.09E-4	1.22E-2	-5.36
2072-05-14.031	77976.031	-0.122	0.97 ± 0.056	1.68E7	7.03E-8	1.22E-2	-8.84
2073-05-13.845	78340.845	-2.086	1.68 ± 0.046	8.63E6	5.36E-9	1.22E-2	-9.97
2073-05-13.954	78340.954	0.842	0.83 ± 0.031	6.56E6	1.32E-7	1.23E-2	-8.57
2075-05-14.116	79071.116	-1.778	1.20 ± 0.116	1.61E6	1.34E-7	1.22E-2	-8.59
2075-05-14.209	79071.209	0.866	0.57 ± 0.129	8.45E6	1.09E-7	1.23E-2	-8.67
2076-05-14.130	79437.130	-0.103	0.48 ± 1.389	9.01E5	1.03E-6	1.21E-2	-7.71
2077-05-13.912	79801.912	1.014	0.35 ± 0.289	2.16E4	3.83E-5	1.22E-2	-6.15
2077-05-14.336	79802.336	-0.139	1.22 ± 0.035	8.46E5	1.29E-6	1.21E-2	-7.62
2078-05-14.076	80167.076	-1.940	1.38 ± 0.102	8.34E5	1.60E-7	1.21E-2	-8.53
2078-05-14.584	80167.584	-0.128	0.67 ± 0.082	6.64E6	1.94E-7	1.22E-2	-8.45
2078-11-15.931	80352.931	-2.056	0.15 ± 1.753	2.74E7	3.47E-9	1.22E-2	-10.20
2079-05-14.647	80532.647	-2.195	1.12 ± 0.023	8.64E5	1.41E-7	1.21E-2	-8.60
2079-05-14.893	80532.893	-0.126	0.47 ± 0.079	1.54E7	8.73E-8	1.21E-2	-8.80
2081-05-13.948	81262.948	0.763	1.72 ± 0.032	1.39E7	1.52E-8	1.22E-2	-9.58
2081-05-14.092	81263.092	-0.124	1.75 ± 0.111	3.40E7	6.47E-9	1.22E-2	-9.95
2083-05-14.344	81993.344	-1.940	0.62 ± 0.063	4.36E6	4.62E-8	1.21E-2	-9.11
2083-05-14.441	81993.441	1.011	1.53 ± 0.024	3.36E6	1.24E-7	1.22E-2	-8.68
2083-05-14.967	81993.967	-0.124	1.69 ± 0.057	8.89E7	4.47E-9	1.22E-2	-10.12
2084-05-13.902	82358.902	-1.907	0.71 ± 0.084	4.81E6	4.42E-8	1.22E-2	-9.14
2087-05-13.645	83453.645	0.871	0.21 ± 0.200	1.38E7	6.89E-8	1.22E-2	-8.96
2087-05-14.588	83454.588	0.759	1.04 ± 0.068	2.56E6	3.56E-7	1.22E-2	-8.25
2088-05-13.993	83819.993	-0.173	1.43 ± 0.004	2.43E5	4.14E-6	1.22E-2	-7.19
2089-05-13.800	84184.800	0.849	1.13 ± 0.127	3.30E7	2.87E-8	1.22E-2	-9.36
2090-05-14.210	84550.210	-1.658	0.83 ± 0.054	1.76E7	1.79E-8	1.22E-2	-9.57
2090-05-14.573	84550.573	-0.110	0.16 ± 2.598	1.73E7	3.25E-8	1.22E-2	-9.31
2090-05-14.706	84550.706	-0.133	1.44 ± 0.043	4.81E6	1.99E-7	1.22E-2	-8.52
2092-05-14.114	85281.114	-0.115	1.11 ± 0.086	3.73E7	2.92E-8	1.22E-2	-9.37
2093-05-13.788	85645.788	0.835	1.76 ± 0.045	4.10E6	2.38E-8	1.22E-2	-9.46
2094-05-14.234	86011.234	0.830	1.70 ± 0.080	2.02E6	4.85E-7	1.22E-2	-8.16
2095-05-13.903	86375.903	-1.891	1.41 ± 0.068	4.05E6	3.79E-8	1.22E-2	-9.27
2097-05-13.696	87106.696	0.845	0.46 ± 0.674	1.98E7	4.49E-8	1.22E-2	-9.21
2098-05-13.800	87471.800	0.579	0.49 ± 0.272	5.62E5	2.01E-6	1.22E-2	-7.57
2103-05-15.667	89298.667	-0.133	0.74 ± 0.000	1.15E8	1.15E-8	1.22E-2	-9.84
2106-05-15.141	90394.141	0.812	1.23 ± 0.063	2.08E6	3.82E-7	1.22E-2	-8.33
2107-05-15.064	90759.064	0.904	1.52 ± 0.040	2.62E6	1.89E-7	1.22E-2	-8.64
2107-05-15.368	90759.368	0.896	0.39 ± 0.575	2.15E6	4.11E-7	1.22E-2	-8.30
2109-05-14.125	91489.125	0.641	1.09 ± 0.080	7.60E6	1.18E-7	1.22E-2	-8.86
2110-05-15.596	91855.596	-0.126	1.41 ± 0.127	1.07E8	1.11E-8	1.22E-2	-9.89
2111-05-14.737	92219.737	0.639	0.95 ± 0.097	8.53E7	1.13E-8	1.22E-2	-9.88
2111-05-15.262	92220.262	0.821	0.18 ± 0.438	4.70E7	2.05E-8	1.22E-2	-9.63
2115-05-15.087	93681.087	1.098	1.32 ± 0.187	1.42E7	3.49E-8	1.22E-2	-9.41
2115-11-16.375	93866.375	0.360	1.05 ± 0.135	1.91E8	5.58E-9	1.22E-2	-10.21
2116-05-14.435	94046.435	0.920	1.19 ± 0.302	1.85E7	3.46E-8	1.22E-2	-9.42
2116-05-14.447	94046.447	0.821	0.11 ± 0.000	8.70E8	1.15E-9	1.22E-2	-10.90
2119-05-15.593	95142.593	-0.129	0.17 ± 0.064	3.32E7	4.18E-8	1.22E-2	-9.35
2120-05-13.855	95506.855	0.643	0.34 ± 0.060	5.42E6	2.07E-7	1.22E-2	-8.66
2120-05-14.126	95507.126	-1.448	1.52 ± 0.093	8.88E4	4.10E-6	1.21E-2	-7.37
2121-05-14.737	95872.737	1.066	1.73 ± 0.036	1.30E6	1.11E-7	1.22E-2	-8.94


Based on 16 optical observations (of which 0 are rejected as outliers) from 2015/05/20.977 to 2015/05/24.030.
Coordinates are given on the Target Plane.
Unit is one Earth radius, but impact cross section has radius between 1.76 and 1.76 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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