Asteroids

2025CY2 help

Last update: 2025-03-13 15:55 UTC

Orbital Properties

Epoch

60800.0

MJD

Orbit type

Apollo

Perihelion (q)

0.975

Aphelion (Q)

1.498

Eccentricity (e)

0.212

Inclination (i)

1.0

deg

Orbit period (P)

501.9

Earth MOID

0.00512

U parameter

6.4

Next Earth close approach

Date

2036-01-14

Nominal distance (from Earth center)

0.00873

1306150

Maximum Brightness

54.7

mag

Risk

Object is in risk list

Object is in priority list

Physical Properties

Absolute Magnitude (H)

28.1

mag

Diameter

6 - 14*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2025-02-07

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

60800.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

1.236036

1-sigma variation

0.000094

Unit

Eccentricity (e)

Value

0.211568

1-sigma variation

0.000063

Unit

Inclination (i)

Value

0.9689

1-sigma variation

0.0003

Unit

Long. of Ascending Node (Ω)

Value

112.2941

1-sigma variation

0.0005

Unit

Arg. of Perihelion (ω)

Value

359.8702

1-sigma variation

0.0006

Unit

Mean Anomaly (M)

Value

79.18932

1-sigma variation

0.00947

Unit

Perihelion distance

Value

0.974531

1-sigma variation

Unit

Aphelion distance

Value

1.497541

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.009338

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.481479

1-sigma variation

Unit

MOID

Value

0.005119

1-sigma variation

Unit

Orbit Period

Value

501.9322

1-sigma variation

Unit

U parameter

Value

6.4

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	8.87752E-9	5.89014E-9	2.59877E-8	1.01952E-8	-1.45806E-8	-8.91976E-7
e	5.89014E-9	3.90806E-9	1.72434E-8	6.81105E-9	-9.72523E-9	-5.91814E-7
i	2.59877E-8	1.72434E-8	7.61722E-8	3.49379E-8	-4.80884E-8	-2.61097E-6
Ω	1.01952E-8	6.81105E-9	3.49379E-8	2.95757E-7	-3.18010E-7	-1.01543E-6
ω	-1.45806E-8	-9.72523E-9	-4.80884E-8	-3.18010E-7	3.44862E-7	1.45466E-6
M	-8.91976E-7	-5.91814E-7	-2.61097E-6	-1.01543E-6	1.45466E-6	8.96228E-5

Date of computation: 2025-02-28 12:48 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

28.125

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 - 14*

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

Unit

Source

[1]

Normalized RMS of residuals

Value

0.66197

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2025-02-07.376348

Unit

Source

[2]

Last Observation

Value

2025-02-28.45677

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

46 (4)

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 2025CY2 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	1968-02-25 00:43	> 1 w	0.0982892	0.0095792	0.0903438
MARS	1971-09-05 17:04	> 1 w	0.0271246	0.0247663	0.0236538
EARTH	1982-11-26 12:56	> 1 d	0.1384667	0.0156375	0.1015306
MARS	1996-02-14 21:08	> 1 d	0.0323911	0.0244218	0.0080793
EARTH	2001-12-06 10:55	> 1 d	0.0508345	0.0139816	0.0141464
EARTH	2025-02-03 16:39	< 1 min	0.0067716	0.0067652	0.0000021
EARTH	2036-01-14 01:10	> 1 d	0.0087311	0.0087271	0.0000413
EARTH	2046-12-12 14:38	> 1 mo	0.0226048	0.0064427	0.1115469
EARTH	2061-12-01 01:19	> 1 mo	0.0845846	0.0086082	2.8779780
EARTH	2062-03-17 16:54	> 1 mo	0.1973935	0.0149251	2.5015746
EARTH	2081-02-25 06:43	> 1 mo	0.1010698	0.0098954	3.0270409
EARTH	2096-02-01 04:10	> 1 mo	0.0062583	0.0062393	0.0876153
EARTH	2121-12-02 21:07	> 1 mo	0.0746923	0.0023167	391.4537384

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
346.10729599	352.87206036	0.00511916	MINIMUM
15.32820171	28.41841841	0.00572073	MINIMUM
1.03036197	11.02426818	0.00937984	SADDLE
180.53484308	190.47481205	0.48149497	SADDLE
0.84477070	190.79226026	1.99056898	SADDLE
180.51515185	10.45507351	2.48143709	MAXIMUM

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MOID Plots

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

Level lines of the squared distance function

2025CY2

Date in UTC	MJD	σ	Distance ± Width in RE	Stretching in RE/σ	IP	Exp. energy	PS
2064-12-22.241	75276.241	-0.627	1.13 ± 0.000	3.06E6	7.35E-7	9.64E-9	-7.72
2064-12-24.212	75278.212	3.625	2.60 ± 0.004	2.47E4	1.15E-7	1.51E-9	-8.53
2064-12-24.259	75278.259	3.396	2.80 ± 0.002	3.57E5	1.84E-8	2.42E-10	-9.32
2064-12-24.440	75278.440	3.766	2.23 ± 0.003	3.23E5	5.96E-9	7.82E-11	-9.81
2067-12-27.570	76376.570	4.226	2.80 ± 0.004	6.48E3	5.57E-8	7.31E-10	-8.87
2071-12-24.114	77834.114	-0.638	1.22 ± 0.000	3.42E6	6.49E-7	8.51E-9	-7.84
2074-12-28.336	78934.336	4.339	2.50 ± 0.004	5.50E3	4.18E-8	5.48E-10	-9.06
2075-12-22.189	79293.189	-0.618	2.90 ± 0.006	8.49E5	1.79E-6	2.35E-8	-7.44
2075-12-24.656	79295.656	3.531	0.70 ± 0.003	1.53E5	3.63E-8	4.76E-10	-9.13
2075-12-25.042	79296.042	3.587	3.62 ± 0.003	8.61E4	2.38E-8	3.12E-10	-9.31
2078-12-24.949	80391.949	-0.645	2.52 ± 0.005	1.31E5	1.43E-5	1.87E-7	-6.56
2079-12-23.067	80755.067	3.527	1.70 ± 0.000	5.67E6	8.97E-10	1.18E-11	-10.77
2079-12-24.548	80756.548	3.777	0.72 ± 0.039	1.03E7	2.17E-10	2.85E-12	-11.39
2083-12-21.310	82214.310	0.424	2.25 ± 0.006	2.73E5	7.61E-6	9.97E-8	-6.87
2085-12-25.819	82949.819	-0.649	0.97 ± 0.022	2.76E6	8.22E-7	1.08E-8	-7.85
2086-12-26.312	83315.312	4.217	1.52 ± 0.000	1.20E7	2.99E-11	3.93E-13	-12.30
2087-12-15.900	83669.900	-0.518	3.06 ± 0.032	1.81E7	9.84E-8	1.29E-9	-8.79
2089-12-23.432	84408.432	-0.632	2.20 ± 0.005	1.39E5	1.38E-5	1.81E-7	-6.66
2094-12-18.098	86229.098	-0.604	2.20 ± 0.219	2.30E7	8.72E-8	1.14E-9	-8.89
2094-12-22.628	86233.628	-0.638	1.64 ± 0.000	3.34E8	6.25E-9	8.21E-11	-10.03
2100-12-26.607	88428.607	-1.041	2.86 ± 0.022	4.61E6	2.53E-7	3.31E-9	-8.46
2101-12-21.209	88788.209	1.607	2.67 ± 0.016	6.91E6	7.91E-8	1.04E-9	-8.97
2102-12-30.611	89162.611	-0.763	3.11 ± 0.004	2.46E6	4.92E-7	6.45E-9	-8.18
2104-12-27.197	89890.197	0.571	3.45 ± 0.004	5.20E5	2.90E-6	3.81E-8	-7.42
2104-12-27.265	89890.265	0.483	2.98 ± 0.002	5.24E5	3.56E-6	4.67E-8	-7.33
2106-12-28.222	90621.222	4.984	3.59 ± 0.003	1.65E4	2.23E-10	2.92E-12	-11.55
2107-12-26.638	90984.638	-0.982	3.35 ± 0.032	1.41E7	6.42E-8	8.41E-10	-9.10
2108-12-22.344	91346.344	-0.624	0.42 ± 0.000	5.15E8	4.55E-9	5.97E-11	-10.25
2108-12-22.606	91346.606	-0.624	2.21 ± 0.000	1.67E8	1.13E-8	1.48E-10	-9.85
2109-12-20.980	91709.980	0.692	1.06 ± 0.007	2.14E4	1.02E-4	1.33E-6	-5.91
2109-12-21.159	91710.159	0.697	2.74 ± 0.006	3.22E5	4.73E-6	6.19E-8	-7.24
2109-12-21.670	91710.670	0.421	0.43 ± 0.358	6.71E7	3.89E-8	5.10E-10	-9.32
2109-12-21.874	91710.874	3.317	1.28 ± 0.253	3.62E7	3.02E-10	3.96E-12	-11.43
2114-12-26.498	93541.498	-1.171	0.17 ± 0.000	1.65E8	8.82E-9	1.16E-10	-9.99
2115-12-20.802	93900.802	-0.609	2.64 ± 0.000	6.15E7	2.77E-8	3.63E-10	-9.50
2115-12-26.011	93906.011	0.455	3.55 ± 0.005	1.65E5	3.19E-6	4.18E-8	-7.44
2116-12-22.469	94268.469	0.729	3.04 ± 0.006	9.34E6	1.43E-7	1.87E-9	-8.79


Based on 46 optical observations (of which 4 are rejected as outliers) from 2025/02/07.376 to 2025/02/28.457.
Coordinates are given on the Target Plane.
Unit is one Earth radius, but impact cross section has radius between 3.61 and 3.63 Earth radii.
Coordinates for LOV = EQU scaled= 1 second= F.
Aegis software version= 4.0, Date of computation=20250305 090852.507 UTC.

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