Asteroids

2023BU7 help

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

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Apollo

Perihelion (q)

0.982

Aphelion (Q)

1.096

Eccentricity (e)

0.055

Inclination (i)

0.9

deg

Orbit period (P)

386.8

Earth MOID

0.00497

U parameter

6.8

Next Earth close approach

Date

2041-01-24

Nominal distance (from Earth center)

0.00638

954576

Maximum Brightness

23.4

mag

Risk

Object is in risk list

Physical Properties

Absolute Magnitude (H)

30.5

mag

Diameter

2.1 - 5*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2023-01-28

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

1.038908

1-sigma variation

0.000101

Unit

Eccentricity (e)

Value

0.054839

1-sigma variation

0.000095

Unit

Inclination (i)

Value

0.9147

1-sigma variation

0.0019

Unit

Long. of Ascending Node (Ω)

Value

329.0355

1-sigma variation

0.0618

Unit

Arg. of Perihelion (ω)

Value

178.7712

1-sigma variation

0.0149

Unit

Mean Anomaly (M)

Value

218.97107

1-sigma variation

0.18054

Unit

Perihelion distance

Value

0.981936

1-sigma variation

Unit

Aphelion distance

Value

1.095881

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.083551

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.007114

1-sigma variation

Unit

MOID

Value

0.004966

1-sigma variation

Unit

Orbit Period

Value

386.7803

1-sigma variation

Unit

U parameter

Value

6.8

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	1.01147E-8	9.52242E-9	-1.89738E-7	6.21047E-6	-1.50013E-6	-1.81571E-5
e	9.52242E-9	8.96484E-9	-1.78628E-7	5.84681E-6	-1.41228E-6	-1.70940E-5
i	-1.89738E-7	-1.78628E-7	3.55989E-6	-1.16519E-4	2.81609E-5	3.40602E-4
Ω	6.21047E-6	5.84681E-6	-1.16519E-4	3.81382E-3	-9.21686E-4	-1.11485E-2
ω	-1.50013E-6	-1.41228E-6	2.81609E-5	-9.21686E-4	2.23133E-4	2.69288E-3
M	-1.81571E-5	-1.70940E-5	3.40602E-4	-1.11485E-2	2.69288E-3	3.25944E-2

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

30.523

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

2.1 - 5*

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

952

Unit

Source

[1]

Normalized RMS of residuals

Value

0.324961

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2023-01-28.225024

Unit

Source

[2]

Last Observation

Value

2023-02-05.882214

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

21 (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 2023BU7 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	1960-01-22 01:47	> 1 mo	0.0512671	0.0017051	9.1185841
EARTH	1960-06-17 22:39	> 1 mo	0.0740688	0.0402589	3.9361822
EARTH	1973-09-12 18:51	> 1 mo	0.1087478	0.1057774	0.3087843
EARTH	1986-12-21 03:02	> 1 mo	0.0572747	0.0118140	0.1231933
EARTH	1987-04-08 11:08	> 1 mo	0.0250568	0.0132742	0.1388459
EARTH	1998-01-28 12:43	1378.3	0.0355176	0.0143724	0.0070794
EARTH	1998-06-05 16:22	> 1 w	0.0671814	0.0554498	0.0040580
EARTH	2010-09-22 17:07	> 1 w	0.1154947	0.1144907	0.0003392
EARTH	2023-02-08 02:13	2.1	0.0033053	0.0032971	0.0000027
EARTH	2041-01-24 09:21	> 1 d	0.0063809	0.0041505	0.0103728
EARTH	2042-01-13 18:29	> 1 mo	0.0097272	0.0096955	0.0091714
EARTH	2042-08-19 09:21	> 1 mo	0.0562771	0.0214474	2.1424505
EARTH	2085-07-28 17:18	> 1 mo	0.0980755	0.0048224	38.1201247
EARTH	2086-07-10 09:29	> 1 mo	0.0007931	0.0000960	11.3741380
EARTH	2096-05-25 22:19	> 1 mo	0.1562408	0.0046237	14115.9123772
EARTH	2096-11-19 20:52	> 1 mo	0.1101876	0.0339662	2344.8468692
EARTH	2107-02-07 22:56	> 1 mo	0.1055831	0.0466726	3940.0072952
EARTH	2107-07-28 04:06	> 1 mo	0.1341640	0.0021111	17517.0952609
EARTH	2117-06-14 08:33	> 1 mo	0.0024628	0.0016118	427.6221780
EARTH	2118-06-19 03:26	> 1 mo	0.1548097	0.1304646	1403.9406077

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
347.98698928	32.35062065	0.00486727	MINIMUM
194.38929790	239.90969086	0.08597922	SADDLE
15.50334038	241.06208511	1.99169647	SADDLE
193.31802445	58.87384240	2.08566258	MAXIMUM

Download:

MOID Plots

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

Level lines of the squared distance function

2023BU7

Date in UTC	MJD	σ	Distance ± Width in RE	Stretching in RE	IP	Impact energy	PS
2074-12-15.522	78921.522	1.928	8.00 ± 0.116	6.80E5	1.94E-6	2.99E-4	-8.70
2085-07-09.809	82780.809	0.141	5.53 ± 0.028	2.67E4	3.11E-4	2.98E-4	-6.58
2085-12-27.399	82951.399	0.529	7.25 ± 0.000	1.88E9	2.74E-9	2.98E-4	-11.64
2087-07-10.753	83511.753	0.004	5.30 ± 0.000	9.61E6	8.18E-7	2.98E-4	-9.18
2090-01-31.581	84447.581	-4.017	9.50 ± 0.000	1.48E6	8.37E-10	2.99E-4	-12.18
2091-01-01.359	84782.359	-2.827	10.60 ± 0.089	8.34E7	1.99E-9	2.98E-4	-11.81
2094-10-31.288	86181.288	0.762	3.76 ± 4.049	8.79E8	5.69E-9	2.99E-4	-11.38
2094-11-01.941	86182.941	1.252	4.59 ± 0.419	5.13E5	6.65E-6	2.98E-4	-8.31
2097-01-24.189	86997.189	-1.033	11.19 ± 0.022	4.26E6	1.06E-6	2.99E-4	-9.12
2101-01-25.245	88458.245	-0.705	10.49 ± 0.039	3.93E6	7.26E-7	2.99E-4	-9.31
2101-01-25.252	88458.252	-0.705	3.81 ± 0.000	2.51E7	2.39E-7	2.98E-4	-9.79
2101-01-25.737	88458.737	-0.645	3.55 ± 0.000	6.12E7	1.12E-7	2.98E-4	-10.12
2104-01-16.040	89544.040	-1.165	10.02 ± 0.000	3.39E8	4.33E-9	2.98E-4	-11.56
2105-01-09.728	89903.728	-0.504	10.85 ± 0.086	1.16E6	6.11E-6	2.98E-4	-8.42
2105-12-26.359	90254.359	1.759	8.00 ± 0.043	3.99E6	3.14E-7	2.98E-4	-9.71
2107-01-29.427	90653.427	-1.490	4.11 ± 0.000	3.86E8	7.35E-9	2.98E-4	-11.35
2111-01-06.556	92091.556	1.459	7.03 ± 8.098	2.42E9	6.28E-10	2.98E-4	-12.43
2111-01-28.434	92113.434	-1.343	1.73 ± 0.000	5.54E9	6.05E-10	2.98E-4	-12.45
2119-12-23.224	95364.224	1.716	5.93 ± 0.000	4.60E8	3.57E-9	2.97E-4	-11.72
2120-12-20.186	95727.186	1.796	8.65 ± 0.253	1.09E8	9.83E-9	2.98E-4	-11.29


Based on 21 optical observations (of which 0 are rejected as outliers) from 2023/01/28.225 to 2023/02/05.882.
Coordinates are given on the Target Plane.
Unit is one Earth radius, but impact cross section has radius between 10.37 and 10.67 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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