Asteroids

2017BU help

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

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Apollo

Perihelion (q)

0.763

Aphelion (Q)

1.276

Eccentricity (e)

0.251

Inclination (i)

1.5

deg

Orbit period (P)

376.0

Earth MOID

0.02290

U parameter

0.1

Next Earth close approach

Date

2051-02-05

Nominal distance (from Earth center)

0.0508

7598925

Maximum Brightness

21.9

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

25.1

mag

Diameter

25 - 60*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2017-01-19

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

61000.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

1.019596

1-sigma variation

4.284E-9

Unit

Eccentricity (e)

Value

0.251451

1-sigma variation

6.210E-8

Unit

Inclination (i)

Value

1.4959

1-sigma variation

1.266E-6

Unit

Long. of Ascending Node (Ω)

Value

74.8034

1-sigma variation

0.0001

Unit

Arg. of Perihelion (ω)

Value

159.9939

1-sigma variation

0.0001

Unit

Mean Anomaly (M)

Value

123.55487

1-sigma variation

0.00001

Unit

Perihelion distance

Value

0.763217

1-sigma variation

Unit

Aphelion distance

Value

1.275974

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.265598

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.243793

1-sigma variation

Unit

MOID

Value

0.022903

1-sigma variation

Unit

Orbit Period

Value

376.0455

1-sigma variation

Unit

U parameter

Value

0.1

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	1.83544E-17	2.65518E-16	-1.53873E-15	9.97564E-14	-1.07345E-13	-5.88247E-14
e	2.65518E-16	3.85661E-15	-2.50387E-14	1.30748E-12	-1.41768E-12	-8.53643E-13
i	-1.53873E-15	-2.50387E-14	1.60218E-12	6.47079E-11	-6.46403E-11	7.54603E-12
Ω	9.97564E-14	1.30748E-12	6.47079E-11	5.91144E-9	-6.00603E-9	-1.64633E-10
ω	-1.07345E-13	-1.41768E-12	-6.46403E-11	-6.00603E-9	6.10708E-9	1.84719E-10
M	-5.88247E-14	-8.53643E-13	7.54603E-12	-1.64633E-10	1.84719E-10	1.96835E-10

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

[1]

Taxonomy (all)

Value

Unit

Source

[2]

Absolute Magnitude (H)
Slope Parameter (G)

H / G

Value

Unit

Source

Absolute Magnitude (H)

Value

25.125

Unit

mag

Source

[3]

Slope Parameter (G)

Value

0.15**

Unit

mag

Source

[3]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

0.05 - 0.25

Unit

Source

[4]

Diameter

Value

25 - 60*

Unit

Source

[4]

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]	EARN	1.) Maxime Devogèle et al 2019 AJ 158 196
[2]	EARN	Earth Asteroids Research Node: https://earn.dlr.de
[3]	ESA Aegis	ESA orbit determination and impact monitoring system
[4]	Estimation	Estimated from absolute magnitude

Observational Information

Arc Length
Unobserved
Normalized RMS of residuals

Arc Information

Value

Unit

Source

Arc Length

Value

2070

Unit

Source

[1]

Unobserved

Value

1093

Unit

Source

[1]

Normalized RMS of residuals

Value

0.545184

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2017-01-19.32131

Unit

Source

[2]

Last Observation

Value

2022-09-20.455447

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

76 (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 2017BU 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	1952-08-28 13:28	< 1 min	0.1249167	0.1249010	0.0000052
EARTH	1953-09-01 01:54	< 1 min	0.0643774	0.0643613	0.0000053
VENUS	1973-01-12 10:25	< 1 min	0.0412871	0.0412863	0.0000003
EARTH	1982-02-04 12:59	< 1 min	0.0562659	0.0562655	0.0000001
EARTH	1983-02-02 00:41	< 1 min	0.1316358	0.1316350	0.0000003
EARTH	1987-08-30 07:01	< 1 min	0.1249780	0.1249748	0.0000011
EARTH	1988-09-01 09:03	< 1 min	0.0619217	0.0619184	0.0000011
EARTH	2016-02-01 05:34	< 1 s	0.1540126	0.1540124	0.0000001
EARTH	2017-02-07 11:34	< 1 s	0.0391421	0.0391420	0.0000000
EARTH	2018-01-08 20:17	< 1 s	0.1962621	0.1962620	0.0000000
EARTH	2018-03-28 02:50	< 1 min	0.1933780	0.1933779	0.0000000
VENUS	2020-05-23 21:09	< 1 s	0.0408284	0.0408282	0.0000001
EARTH	2021-07-14 05:54	< 1 min	0.1901856	0.1901855	0.0000000
EARTH	2021-09-26 18:36	< 1 s	0.1937811	0.1937810	0.0000000
EARTH	2022-08-29 16:34	< 1 s	0.0404751	0.0404750	0.0000000
EARTH	2023-09-05 18:26	< 1 s	0.1435358	0.1435356	0.0000001
EARTH	2051-02-05 10:09	< 1 min	0.0507957	0.0507928	0.0000010
EARTH	2052-01-30 21:51	< 1 min	0.1378862	0.1378837	0.0000008
EARTH	2056-08-29 04:35	< 1 s	0.1212429	0.1212428	0.0000000
EARTH	2057-09-02 02:09	< 1 s	0.0640856	0.0640851	0.0000002
VENUS	2070-11-04 05:26	< 1 min	0.0393890	0.0393887	0.0000001
VENUS	2073-12-07 05:58	1.2	0.0478926	0.0478850	0.0000025
EARTH	2086-01-30 20:31	< 1 min	0.1952797	0.1952481	0.0000105
EARTH	2087-02-07 13:23	< 1 min	0.0240025	0.0239928	0.0000033
EARTH	2088-01-21 00:56	9.3	0.1656284	0.1655906	0.0000126
EARTH	2088-03-14 04:47	14.0	0.1675702	0.1675369	0.0000111
EARTH	2092-08-29 03:30	1.6	0.1042777	0.1041583	0.0000398
EARTH	2093-09-03 13:32	2.2	0.0769265	0.0767989	0.0000425
EARTH	2122-02-03 14:23	2.1	0.1330197	0.1328833	0.0000455
EARTH	2123-02-10 09:50	1.2	0.0517742	0.0516565	0.0000393
EARTH	2124-04-01 06:45	30.9	0.1986323	0.1985827	0.0000165

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
277.23585457	34.57242328	0.02294118	MINIMUM
87.53824446	235.49426000	0.02614751	MINIMUM
3.16830441	135.80135076	0.24816665	SADDLE
181.83438756	314.50663942	0.28748047	SADDLE
3.22374776	315.89443539	1.75172215	SADDLE
182.05042336	134.68409497	2.28712846	MAXIMUM

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MOID Plots

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