Asteroids

2025CY2 help

Last update: 2026-03-17 23:26 UTC

Orbital Properties

Epoch

61200.0

MJD

Orbit type

Apollo

Perihelion (q)

0.974

Aphelion (Q)

1.498

Eccentricity (e)

0.212

Inclination (i)

1.0

deg

Orbit period (P)

502.0

Earth MOID

0.00514

U parameter

6.5

Next Earth close approach

Date

2036-01-14

Nominal distance (from Earth center)

0.00873

1306152

Maximum Brightness

mag

Risk

Object is in risk list

Physical Properties

Absolute Magnitude (H)

28.2

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

61200.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

1.236066

1-sigma variation

0.000094

Unit

Eccentricity (e)

Value

0.211626

1-sigma variation

0.000062

Unit

Inclination (i)

Value

0.9690

1-sigma variation

0.0003

Unit

Long. of Ascending Node (Ω)

Value

112.2938

1-sigma variation

0.0005

Unit

Arg. of Perihelion (ω)

Value

359.8921

1-sigma variation

0.0006

Unit

Mean Anomaly (M)

Value

6.05459

1-sigma variation

0.04226

Unit

Perihelion distance

Value

0.974482

1-sigma variation

Unit

Aphelion distance

Value

1.497650

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.009169

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.480962

1-sigma variation

Unit

MOID

Value

0.005143

1-sigma variation

Unit

Orbit Period

Value

501.9505

1-sigma variation

Unit

U parameter

Value

6.5

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	8.86571E-9	5.88321E-9	2.59658E-8	1.03303E-8	-1.54426E-8	-3.97944E-6
e	5.88321E-9	3.90405E-9	1.72315E-8	6.90166E-9	-1.02987E-8	-2.64072E-6
i	2.59658E-8	1.72315E-8	7.61453E-8	3.53479E-8	-5.06339E-8	-1.16548E-5
Ω	1.03303E-8	6.90166E-9	3.53479E-8	2.96006E-7	-3.19178E-7	-4.62787E-6
ω	-1.54426E-8	-1.02987E-8	-5.06339E-8	-3.19178E-7	3.47730E-7	6.92121E-6
M	-3.97944E-6	-2.64072E-6	-1.16548E-5	-4.62787E-6	6.92121E-6	1.78620E-3

Date of computation: 2026-03-17 23:26 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

28.216

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

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

414

Unit

Source

[1]

Normalized RMS of residuals

Value

0.661968

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

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 2025CY2 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	1968-02-25 00:46	> 1 w	0.0983117	0.0095800	0.0902792
MARS	1971-09-05 16:59	> 1 w	0.0271304	0.0247662	0.0236690
EARTH	1982-11-26 12:59	> 1 d	0.1384414	0.0156370	0.1015148
MARS	1996-02-14 21:07	> 1 d	0.0323931	0.0244217	0.0080780
EARTH	2001-12-06 10:54	> 1 d	0.0508380	0.0139831	0.0141465
EARTH	2025-02-03 16:39	< 1 min	0.0067716	0.0067652	0.0000021
EARTH	2036-01-14 01:12	> 1 d	0.0087311	0.0087272	0.0000410
EARTH	2046-12-12 14:23	> 1 mo	0.0226349	0.0064445	0.1115832
EARTH	2061-12-01 03:26	> 1 mo	0.0838099	0.0085895	2.8705629
EARTH	2081-02-25 04:46	> 1 mo	0.1002324	0.0098865	3.1845539
EARTH	2096-01-31 21:43	> 1 mo	0.0062419	0.0062382	0.0356320
EARTH	2111-03-01 16:16	> 1 mo	0.1413383	0.0085591	266.8048471
EARTH	2121-11-24 11:07	> 1 mo	0.1676247	0.0035064	271.0767723

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
346.23959948	353.96830709	0.00509549	MINIMUM
15.44661942	29.46653056	0.00573716	MINIMUM
1.18108332	12.12673448	0.00933877	SADDLE
180.62243963	191.50964058	0.47972026	SADDLE
0.98530091	191.88121711	1.99236907	SADDLE
180.59869551	11.48574509	2.48142059	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	IP	Impact energy	PS
2064-12-22.241	75276.241	-0.627	1.13 ± 0.000	3.06E6	7.35E-7	1.31E-2	-7.72
2064-12-24.212	75278.212	3.625	2.60 ± 0.004	2.47E4	1.15E-7	1.31E-2	-8.53
2064-12-24.259	75278.259	3.396	2.80 ± 0.002	3.57E5	1.84E-8	1.32E-2	-9.32
2064-12-24.440	75278.440	3.766	2.23 ± 0.003	3.23E5	5.96E-9	1.31E-2	-9.81
2067-12-27.570	76376.570	4.226	2.80 ± 0.004	6.48E3	5.57E-8	1.31E-2	-8.87
2071-12-24.114	77834.114	-0.638	1.22 ± 0.000	3.42E6	6.49E-7	1.31E-2	-7.84
2074-12-28.336	78934.336	4.339	2.50 ± 0.004	5.50E3	4.18E-8	1.31E-2	-9.06
2075-12-22.189	79293.189	-0.618	2.90 ± 0.006	8.49E5	1.79E-6	1.31E-2	-7.44
2075-12-24.656	79295.656	3.531	0.70 ± 0.003	1.53E5	3.63E-8	1.31E-2	-9.13
2075-12-25.042	79296.042	3.587	3.62 ± 0.003	8.61E4	2.38E-8	1.31E-2	-9.31
2078-12-24.949	80391.949	-0.645	2.52 ± 0.005	1.31E5	1.43E-5	1.31E-2	-6.56
2079-12-23.067	80755.067	3.527	1.70 ± 0.000	5.67E6	8.97E-10	1.32E-2	-10.77
2079-12-24.548	80756.548	3.777	0.72 ± 0.039	1.03E7	2.17E-10	1.31E-2	-11.39
2083-12-21.310	82214.310	0.424	2.25 ± 0.006	2.73E5	7.61E-6	1.31E-2	-6.87
2085-12-25.819	82949.819	-0.649	0.97 ± 0.022	2.76E6	8.22E-7	1.31E-2	-7.85
2086-12-26.312	83315.312	4.217	1.52 ± 0.000	1.20E7	2.99E-11	1.31E-2	-12.30
2087-12-15.900	83669.900	-0.518	3.06 ± 0.032	1.81E7	9.84E-8	1.31E-2	-8.79
2089-12-23.432	84408.432	-0.632	2.20 ± 0.005	1.39E5	1.38E-5	1.31E-2	-6.66
2094-12-18.098	86229.098	-0.604	2.20 ± 0.219	2.30E7	8.72E-8	1.31E-2	-8.89
2094-12-22.628	86233.628	-0.638	1.64 ± 0.000	3.34E8	6.25E-9	1.31E-2	-10.03
2100-12-26.607	88428.607	-1.041	2.86 ± 0.022	4.61E6	2.53E-7	1.31E-2	-8.46
2101-12-21.209	88788.209	1.607	2.67 ± 0.016	6.91E6	7.91E-8	1.31E-2	-8.97
2102-12-30.611	89162.611	-0.763	3.11 ± 0.004	2.46E6	4.92E-7	1.31E-2	-8.18
2104-12-27.197	89890.197	0.571	3.45 ± 0.004	5.20E5	2.90E-6	1.31E-2	-7.42
2104-12-27.265	89890.265	0.483	2.98 ± 0.002	5.24E5	3.56E-6	1.31E-2	-7.33
2106-12-28.222	90621.222	4.984	3.59 ± 0.003	1.65E4	2.23E-10	1.31E-2	-11.55
2107-12-26.638	90984.638	-0.982	3.35 ± 0.032	1.41E7	6.42E-8	1.31E-2	-9.10
2108-12-22.344	91346.344	-0.624	0.42 ± 0.000	5.15E8	4.55E-9	1.31E-2	-10.25
2108-12-22.606	91346.606	-0.624	2.21 ± 0.000	1.67E8	1.13E-8	1.31E-2	-9.85
2109-12-20.980	91709.980	0.692	1.06 ± 0.007	2.14E4	1.02E-4	1.30E-2	-5.91
2109-12-21.159	91710.159	0.697	2.74 ± 0.006	3.22E5	4.73E-6	1.31E-2	-7.24
2109-12-21.670	91710.670	0.421	0.43 ± 0.358	6.71E7	3.89E-8	1.31E-2	-9.32
2109-12-21.874	91710.874	3.317	1.28 ± 0.253	3.62E7	3.02E-10	1.31E-2	-11.43
2114-12-26.498	93541.498	-1.171	0.17 ± 0.000	1.65E8	8.82E-9	1.32E-2	-9.99
2115-12-20.802	93900.802	-0.609	2.64 ± 0.000	6.15E7	2.77E-8	1.31E-2	-9.50
2115-12-26.011	93906.011	0.455	3.55 ± 0.005	1.65E5	3.19E-6	1.31E-2	-7.44
2116-12-22.469	94268.469	0.729	3.04 ± 0.006	9.34E6	1.43E-7	1.31E-2	-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=20250805 130500.123 UTC.

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