Asteroids

2025BT4 help

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

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Apollo

Perihelion (q)

0.974

Aphelion (Q)

2.337

Eccentricity (e)

0.412

Inclination (i)

1.2

deg

Orbit period (P)

777.9

Earth MOID

0.00076

U parameter

7.2

Next Earth close approach

Date

2056-11-19

Nominal distance (from Earth center)

0.19179

28690959

Maximum Brightness

27.6

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

28.6

mag

Diameter

5 - 11*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2025-01-21

Observatory

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

61000.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

1.655392

1-sigma variation

0.000648

Unit

Eccentricity (e)

Value

0.411865

1-sigma variation

0.000233

Unit

Inclination (i)

Value

1.2021

1-sigma variation

0.0006

Unit

Long. of Ascending Node (Ω)

Value

117.9707

1-sigma variation

0.0002

Unit

Arg. of Perihelion (ω)

Value

346.2846

1-sigma variation

0.0005

Unit

Mean Anomaly (M)

Value

147.07064

1-sigma variation

0.08672

Unit

Perihelion distance

Value

0.973595

1-sigma variation

Unit

Aphelion distance

Value

2.337190

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.002620

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

1.274802

1-sigma variation

Unit

MOID

Value

0.000761

1-sigma variation

Unit

Orbit Period

Value

777.9466

1-sigma variation

Unit

U parameter

Value

7.2

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	4.19891E-7	1.51109E-7	3.65324E-7	-5.13757E-9	-2.84871E-7	-5.61909E-5
e	1.51109E-7	5.43806E-8	1.31473E-7	-1.83968E-9	-1.02531E-7	-2.02218E-5
i	3.65324E-7	1.31473E-7	3.18290E-7	-1.13827E-9	-2.51409E-7	-4.88886E-5
Ω	-5.13757E-9	-1.83968E-9	-1.13827E-9	3.02371E-8	-2.86665E-8	6.87628E-7
ω	-2.84871E-7	-1.02531E-7	-2.51409E-7	-2.86665E-8	2.30060E-7	3.81211E-5
M	-5.61909E-5	-2.02218E-5	-4.88886E-5	6.87628E-7	3.81211E-5	7.51961E-3

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

28.595

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

5 - 11*

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

314

Unit

Source

[1]

Normalized RMS of residuals

Value

0.815338

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2025-01-21.503606

Unit

Source

[2]

Last Observation

Value

2025-01-30.345417

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

19 (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 2025BT4 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	2021-02-12 18:29	> 1 d	0.1185571	0.0814299	0.0123929
EARTH	2023-01-26 23:11	> 1 d	0.0157231	0.0012979	0.0058646
EARTH	2025-01-20 07:55	< 1 min	0.0008039	0.0008024	0.0000005
EARTH	2056-11-19 04:07	> 1 d	0.1917872	0.0152514	0.0920018
EARTH	2073-12-21 13:36	> 1 w	0.0097203	0.0094361	0.0088887
EARTH	2090-12-01 04:48	> 1 mo	0.0761654	0.0131378	2.3943690

Download as:

Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
10.12347156	18.26465514	0.00076087	MINIMUM
351.52815866	350.03565758	0.00964819	MINIMUM
358.54809012	0.69166822	0.01122653	SADDLE
180.04021226	183.00092422	1.31906774	SADDLE
0.11668035	183.07745759	1.99173205	SADDLE
180.05217219	3.00792407	3.32074907	MAXIMUM

Download:

MOID Plots

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