Asteroids

2025DD4 help

Last update: 2025-11-24 16:53 UTC

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Apollo

Perihelion (q)

0.255

Aphelion (Q)

3.835

Eccentricity (e)

0.875

Inclination (i)

6.8

deg

Orbit period (P)

1068.3

Earth MOID

0.03572

U parameter

7.8

Next Earth close approach

Date

2028-02-26

Nominal distance (from Earth center)

0.14128

21134946

Maximum Brightness

20.9

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

21.6

mag

Diameter

130 - 290*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2025-02-22

Observatory

Kitt Peak-Bok

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

2.045125

1-sigma variation

0.002687

Unit

Eccentricity (e)

Value

0.875406

1-sigma variation

0.000299

Unit

Inclination (i)

Value

6.7676

1-sigma variation

0.0085

Unit

Long. of Ascending Node (Ω)

Value

324.7459

1-sigma variation

0.0027

Unit

Arg. of Perihelion (ω)

Value

324.1340

1-sigma variation

0.0104

Unit

Mean Anomaly (M)

Value

69.11609

1-sigma variation

0.13115

Unit

Perihelion distance

Value

0.254810

1-sigma variation

Unit

Aphelion distance

Value

3.835440

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.733707

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.655783

1-sigma variation

Unit

MOID

Value

0.035724

1-sigma variation

Unit

Orbit Period

Value

1068.2629

1-sigma variation

Unit

U parameter

Value

7.8

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	7.21861E-6	8.04569E-7	2.27866E-5	7.12696E-6	2.78929E-5	-3.52374E-4
e	8.04569E-7	8.96787E-8	2.53992E-6	7.94460E-7	3.10940E-6	-3.92747E-5
i	2.27866E-5	2.53992E-6	7.19478E-5	2.25124E-5	8.80672E-5	-1.11232E-3
Ω	7.12696E-6	7.94460E-7	2.25124E-5	7.05148E-6	2.75443E-5	-3.47898E-4
ω	2.78929E-5	3.10940E-6	8.80672E-5	2.75443E-5	1.07875E-4	-1.36157E-3
M	-3.52374E-4	-3.92747E-5	-1.11232E-3	-3.47898E-4	-1.36157E-3	1.72010E-2

Date of computation: 2025-11-24 16:53 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

21.583

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

130 - 290*

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

300

Unit

Source

[1]

Normalized RMS of residuals

Value

0.676777

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2025-02-18.33087

Unit

Source

[2]

Last Observation

Value

2025-03-21.135538

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

54 (2)

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 2025DD4 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	1990-03-09 22:22	> 1 w	0.1847450	0.0324974	0.3601866
EARTH	2028-02-26 08:00	> 1 d	0.1412784	0.0498208	0.0331381
EARTH	2048-11-22 13:26	> 1 w	0.1814362	0.1183670	0.1938018
EARTH	2078-03-12 16:43	> 1 w	0.1543976	0.0474495	0.5964687
EARTH	2081-03-02 20:24	> 1 w	0.0897750	0.0474884	0.5450454

Download as:

Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
305.93969771	60.20250283	0.03572367	MINIMUM
53.57195439	314.20434852	0.11656948	MINIMUM
359.47829832	186.17059183	0.76408118	SADDLE
359.58755108	6.60826131	1.23798455	SADDLE
179.90913463	7.70601380	2.85490230	SADDLE
180.02444052	187.73434346	4.85152436	MAXIMUM

Download:

MOID Plots

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