Asteroids

2015YQ1 help

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

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Apollo

Perihelion (q)

0.599

Aphelion (Q)

1.410

Eccentricity (e)

0.404

Inclination (i)

2.5

deg

Orbit period (P)

367.7

Earth MOID

0.00065

U parameter

5.4

Next Earth close approach

Date

2051-08-10

Nominal distance (from Earth center)

0.18909

28287170

Maximum Brightness

26.6

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

27.9

mag

Diameter

7 - 16*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2015-12-19

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

1.004520

1-sigma variation

0.000011

Unit

Eccentricity (e)

Value

0.403930

1-sigma variation

0.000161

Unit

Inclination (i)

Value

2.4863

1-sigma variation

0.0014

Unit

Long. of Ascending Node (Ω)

Value

88.6627

1-sigma variation

0.0003

Unit

Arg. of Perihelion (ω)

Value

111.9350

1-sigma variation

0.0134

Unit

Mean Anomaly (M)

Value

245.38199

1-sigma variation

0.01300

Unit

Perihelion distance

Value

0.598764

1-sigma variation

Unit

Aphelion distance

Value

1.410276

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.006603

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.287612

1-sigma variation

Unit

MOID

Value

0.000649

1-sigma variation

Unit

Orbit Period

Value

367.7362

1-sigma variation

Unit

U parameter

Value

5.4

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	1.25462E-10	-1.80641E-9	-1.55986E-8	3.41436E-9	-1.49602E-7	-1.45549E-7
e	-1.80641E-9	2.60184E-8	2.24677E-7	-4.92249E-8	2.15471E-6	2.09631E-6
i	-1.55986E-8	2.24677E-7	1.94049E-6	-4.25126E-7	1.86066E-5	1.81023E-5
Ω	3.41436E-9	-4.92249E-8	-4.25126E-7	9.34245E-8	-4.07636E-6	-3.96571E-6
ω	-1.49602E-7	2.15471E-6	1.86066E-5	-4.07636E-6	1.78443E-4	1.73606E-4
M	-1.45549E-7	2.09631E-6	1.81023E-5	-3.96571E-6	1.73606E-4	1.68901E-4

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

27.906

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

7 - 16*

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

3575

Unit

Source

[1]

Normalized RMS of residuals

Value

0.478866

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2015-12-19.30328

Unit

Source

[2]

Last Observation

Value

2015-12-22.16962

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

64 (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 2015YQ1 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
VENUS	1955-11-11 14:01	346.9	0.0172877	0.0105373	0.0030294
VENUS	1963-08-15 09:44	479.3	0.0231973	0.0144569	0.0037954
MARS	1986-11-18 21:21	1167.1	0.0439913	0.0417189	0.0008150
EARTH	1987-08-18 13:15	268.3	0.1888536	0.1752054	0.0045553
EARTH	1988-08-15 06:17	227.3	0.1270498	0.1159245	0.0037219
EARTH	1989-08-13 03:57	175.9	0.0694496	0.0617201	0.0026280
EARTH	1990-08-11 09:30	113.0	0.0339356	0.0338721	0.0001222
EARTH	1991-08-10 02:51	63.2	0.0650830	0.0614497	0.0012255
EARTH	1992-08-08 23:54	8.4	0.1197480	0.1174229	0.0007758
EARTH	1993-08-12 22:27	7.0	0.1770848	0.1765643	0.0001735
VENUS	2001-05-23 19:24	432.5	0.0490061	0.0329231	0.0054180
MARS	2005-09-13 12:55	1061.0	0.0400276	0.0391392	0.0003268
EARTH	2012-12-16 22:09	357.3	0.1810888	0.1761921	0.0016323
EARTH	2013-12-22 11:58	59.9	0.1208574	0.1171465	0.0012370
EARTH	2014-12-23 00:55	9.7	0.0606468	0.0586915	0.0006518
EARTH	2015-12-22 02:05	< 1 s	0.0037253	0.0037207	0.0000016
EARTH	2016-12-21 16:38	23.8	0.0166054	0.0147715	0.0006114
EARTH	2017-12-22 14:40	19.0	0.0446831	0.0427836	0.0006332
EARTH	2018-12-23 10:05	7.7	0.0777480	0.0760374	0.0005702
EARTH	2019-12-23 12:47	9.8	0.1142210	0.1127831	0.0004793
EARTH	2020-12-21 01:09	30.3	0.1523993	0.1512779	0.0003738
EARTH	2021-12-16 21:15	39.1	0.1899992	0.1892172	0.0002607
MARS	2022-08-10 00:47	101.1	0.0325543	0.0324433	0.0000393
MARS	2050-11-15 14:33	441.3	0.0350031	0.0346842	0.0001065
EARTH	2051-08-10 21:12	301.5	0.1890881	0.1842050	0.0016281
EARTH	2052-08-06 16:27	145.8	0.1576269	0.1527492	0.0016268
EARTH	2053-08-05 18:46	55.5	0.1258049	0.1211829	0.0015424
EARTH	2054-08-06 00:47	11.6	0.0952998	0.0911031	0.0014025
EARTH	2055-08-06 16:45	8.5	0.0678564	0.0643126	0.0011899
EARTH	2056-08-06 15:02	12.0	0.0460229	0.0435698	0.0008388
EARTH	2057-08-07 13:36	10.1	0.0334588	0.0327231	0.0002842
EARTH	2058-08-08 14:05	14.2	0.0351063	0.0341470	0.0003557
EARTH	2059-08-09 18:41	23.6	0.0514303	0.0489600	0.0008390
EARTH	2060-08-10 03:47	31.6	0.0775473	0.0743468	0.0010723
EARTH	2061-08-11 16:17	36.0	0.1086781	0.1051527	0.0011774
EARTH	2062-08-13 08:20	38.6	0.1427089	0.1390392	0.0012243
EARTH	2063-08-15 02:12	39.6	0.1782226	0.1744953	0.0012430
MARS	2094-01-26 19:48	182.1	0.0322050	0.0318981	0.0001036
MARS	2122-05-12 21:33	158.1	0.0347891	0.0345819	0.0000740

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
272.88909065	347.42504770	0.00066944	MINIMUM
90.90947512	213.51414933	0.03208083	MINIMUM
3.24097481	101.83467593	0.40507903	SADDLE
181.25982184	279.86766172	0.41578433	SADDLE
3.38886206	282.07338418	1.59544679	SADDLE
181.52181765	100.04189177	2.41229825	MAXIMUM

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MOID Plots

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