Asteroids

2015YA help

Last update: 2026-06-04 23:11 UTC

Orbital Properties

Epoch

61200.0

MJD

Orbit type

Aten

Perihelion (q)

0.717

Aphelion (Q)

1.274

Eccentricity (e)

0.280

Inclination (i)

1.6

deg

Orbit period (P)

362.6

Earth MOID

0.00362

U parameter

5.1

Next Earth close approach

Date

2038-04-20

Nominal distance (from Earth center)

0.18067

27027691

Maximum Brightness

25.5

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

27.4

mag

Diameter

9 - 20*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2015-12-16

Observatory

University of Arizona Catalina Sky 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

0.995170

1-sigma variation

0.000002

Unit

Eccentricity (e)

Value

0.279703

1-sigma variation

0.000210

Unit

Inclination (i)

Value

1.6182

1-sigma variation

0.0008

Unit

Long. of Ascending Node (Ω)

Value

254.8623

1-sigma variation

0.0033

Unit

Arg. of Perihelion (ω)

Value

83.4652

1-sigma variation

0.0160

Unit

Mean Anomaly (M)

Value

270.12002

1-sigma variation

0.08992

Unit

Perihelion distance

Value

0.716818

1-sigma variation

Unit

Aphelion distance

Value

1.273523

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.126123

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.037532

1-sigma variation

Unit

MOID

Value

0.003616

1-sigma variation

Unit

Orbit Period

Value

362.6140

1-sigma variation

Unit

U parameter

Value

5.1

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	5.96022E-12	5.12274E-10	1.92270E-9	7.82956E-9	-3.90071E-8	-2.19519E-7
e	5.12274E-10	4.40434E-8	1.65251E-7	6.72303E-7	-3.35290E-6	-1.88677E-5
i	1.92270E-9	1.65251E-7	6.24335E-7	2.55753E-6	-1.26136E-5	-7.08272E-5
Ω	7.82956E-9	6.72303E-7	2.55753E-6	1.05644E-5	-5.14683E-5	-2.88461E-4
ω	-3.90071E-8	-3.35290E-6	-1.26136E-5	-5.14683E-5	2.55521E-4	1.43676E-3
M	-2.19519E-7	-1.88677E-5	-7.08272E-5	-2.88461E-4	1.43676E-3	8.08511E-3

Date of computation: 2026-06-04 23:11 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

27.388

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

9 - 20*

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

[-]

Download this part as:

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

3837

Unit

Source

[1]

Normalized RMS of residuals

Value

0.666689

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2015-12-16.33347

Unit

Source

[2]

Last Observation

Value

2015-12-21.28348

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

50 (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

Filters

Initial Date: *

Final Date: *

Normalised Only accepted

Max residual (arcsec):

* - these fields are required

Plot

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 2015YA 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	1987-05-08 04:58	819.8	0.1939800	0.1442795	0.0165819
EARTH	1988-05-09 18:12	732.7	0.1389072	0.0959477	0.0143519
EARTH	1989-05-12 01:19	589.4	0.0877521	0.0535269	0.0115003
EARTH	1990-05-14 03:07	387.0	0.0411044	0.0196017	0.0077523
EARTH	1991-05-15 17:16	90.1	0.0134264	0.0134246	0.0000081
EARTH	1992-05-16 00:29	107.7	0.0375244	0.0259497	0.0039910
EARTH	1993-05-16 22:15	39.4	0.0786564	0.0648003	0.0046326
EARTH	1994-05-14 16:51	748.9	0.1241430	0.1098942	0.0047522
EARTH	1995-05-02 05:17	> 1 d	0.1678581	0.1557663	0.0040308
EARTH	1995-06-08 23:11	> 1 d	0.1748678	0.1616616	0.0044060
EARTH	2010-11-11 06:56	446.4	0.1854482	0.1846216	0.0002756
EARTH	2011-01-02 00:48	295.0	0.1767470	0.1758321	0.0003050
EARTH	2011-12-20 22:17	83.0	0.1375688	0.1370615	0.0001691
EARTH	2012-12-13 14:46	2.0	0.0931874	0.0929590	0.0000761
EARTH	2013-12-13 12:50	7.1	0.0510281	0.0500190	0.0003364
EARTH	2014-12-14 14:02	21.8	0.0158936	0.0142967	0.0005338
EARTH	2015-12-15 04:48	< 1 min	0.0038529	0.0038440	0.0000030
EARTH	2016-12-13 20:09	18.6	0.0239119	0.0221540	0.0005865
EARTH	2017-12-13 15:24	1.9	0.0597380	0.0572534	0.0008282
EARTH	2018-12-15 00:46	102.5	0.1005996	0.0976804	0.0009731
EARTH	2019-12-22 07:40	389.6	0.1379291	0.1350816	0.0009492
EARTH	2020-11-13 17:22	967.1	0.1835933	0.1809987	0.0008649
EARTH	2020-12-31 17:16	622.2	0.1711331	0.1687269	0.0008021
EARTH	2022-01-09 20:29	715.5	0.1987432	0.1967941	0.0006497
EARTH	2038-04-20 22:12	1242.8	0.1806690	0.1751423	0.0018422
EARTH	2038-06-13 23:59	> 1 d	0.1926658	0.1868720	0.0019319
EARTH	2039-04-30 23:05	960.9	0.1507002	0.1440204	0.0022267
EARTH	2040-05-08 14:36	367.2	0.1157313	0.1083487	0.0024615
EARTH	2041-05-11 03:55	69.9	0.0807263	0.0734956	0.0024126
EARTH	2042-05-11 07:40	20.8	0.0491260	0.0426530	0.0021675
EARTH	2043-05-10 23:12	36.1	0.0246639	0.0202319	0.0015295
EARTH	2044-05-09 18:46	6.5	0.0135656	0.0126352	0.0003637
EARTH	2045-05-09 23:27	5.2	0.0122144	0.0118117	0.0001950
EARTH	2046-05-10 06:20	71.9	0.0126774	0.0117861	0.0008238
EARTH	2047-05-10 18:22	309.7	0.0175496	0.0117944	0.0057400
EARTH	2048-05-10 12:52	430.2	0.0361753	0.0118426	0.0122740
EARTH	2049-05-11 08:47	225.7	0.0647776	0.0206532	0.0153332
EARTH	2050-05-11 10:25	685.1	0.0984418	0.0483335	0.0168318
EARTH	2051-05-07 05:43	> 1 d	0.1344952	0.0836229	0.0169898
EARTH	2052-04-25 19:08	> 1 d	0.1683765	0.1240211	0.0147926
EARTH	2052-06-02 11:30	> 1 w	0.1759079	0.1268335	0.0164159
EARTH	2053-04-16 04:14	> 1 d	0.1979317	0.1617359	0.0120691
EARTH	2071-01-03 11:02	139.5	0.1968854	0.1964098	0.0001665
EARTH	2071-11-09 02:13	944.7	0.1811758	0.1774192	0.0012524
EARTH	2071-12-26 18:33	917.7	0.1723099	0.1691409	0.0010629
EARTH	2072-12-16 21:03	1242.5	0.1440554	0.1358126	0.0027534
EARTH	2073-12-10 04:17	726.3	0.1132967	0.0995689	0.0045842
EARTH	2074-12-08 16:28	271.6	0.0834818	0.0652179	0.0061064
EARTH	2075-12-08 23:39	16.1	0.0549431	0.0336739	0.0071537
EARTH	2076-12-08 14:18	119.2	0.0319392	0.0113330	0.0072869
EARTH	2077-12-09 04:08	67.6	0.0197847	0.0075674	0.0049108
EARTH	2078-12-09 06:10	154.1	0.0252868	0.0221116	0.0010632
EARTH	2079-12-09 02:12	259.8	0.0436993	0.0240738	0.0065477
EARTH	2080-12-08 06:13	4.7	0.0694174	0.0368948	0.0108447
EARTH	2081-12-09 10:37	1081.7	0.0990620	0.0564430	0.0142067
EARTH	2082-12-14 15:31	> 1 d	0.1306575	0.0821231	0.0161808
EARTH	2083-12-23 01:07	> 1 d	0.1586764	0.1112091	0.0158359
EARTH	2084-11-01 18:01	> 1 w	0.1956013	0.1512797	0.0148144
EARTH	2084-12-30 08:01	> 1 w	0.1833618	0.1396647	0.0145862
EARTH	2104-04-18 13:54	> 1 d	0.1753458	0.1409860	0.0114593
EARTH	2104-06-06 03:05	> 1 w	0.1863851	0.1491085	0.0124652
EARTH	2105-04-28 21:34	> 1 d	0.1452971	0.1101760	0.0117201
EARTH	2106-05-06 02:58	1230.3	0.1118283	0.0812638	0.0102168
EARTH	2107-05-08 03:10	58.4	0.0791825	0.0571013	0.0074052
EARTH	2108-05-07 03:40	147.3	0.0499942	0.0380576	0.0040305
EARTH	2109-05-06 23:33	77.2	0.0292247	0.0284811	0.0002490
EARTH	2110-05-06 21:39	82.5	0.0189724	0.0134214	0.0026612
EARTH	2111-05-07 02:03	255.6	0.0181231	0.0131928	0.0053728
EARTH	2112-05-06 14:19	456.9	0.0256393	0.0131948	0.0112254
EARTH	2113-05-07 08:30	425.8	0.0439321	0.0132054	0.0147305
EARTH	2114-05-07 23:43	82.8	0.0699890	0.0256251	0.0153070
EARTH	2115-05-08 00:30	695.4	0.1004998	0.0571230	0.0145516
EARTH	2116-05-03 10:02	> 1 d	0.1331050	0.0946406	0.0128395
EARTH	2117-04-23 13:02	> 1 d	0.1652992	0.1362399	0.0096884
EARTH	2118-04-14 06:45	> 1 d	0.1932220	0.1729718	0.0067505

Download as:

Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
87.71353708	341.38727017	0.00359077	MINIMUM
266.91516924	127.08146584	0.01248054	MINIMUM
177.91829430	54.83920736	0.28421393	SADDLE
356.25536673	233.15938554	0.29472868	SADDLE
356.25500808	53.13559660	1.70757587	SADDLE
177.78335747	234.72607962	2.28376749	MAXIMUM

Download:

MOID Plots

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