Asteroids

2017AE21 help

Last update: 2025-03-13 15:55 UTC

Orbital Properties

Epoch

60800.0

MJD

Orbit type

Apollo

Perihelion (q)

0.905

Aphelion (Q)

1.309

Eccentricity (e)

0.183

Inclination (i)

3.1

deg

Orbit period (P)

425.5

Earth MOID

0.00680

U parameter

9.0

Next Earth close approach

Date

2030-09-04

Nominal distance (from Earth center)

0.09941

14871565

Maximum Brightness

26.5

mag

Risk

Object is in risk list

Object is not in priority list

Physical Properties

Absolute Magnitude (H)

24.8

mag

Diameter

30 - 70*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

2017-01-03

Observatory

Pan-STARRS 1, Haleakala

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

60800.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

1.107203

1-sigma variation

0.229853

Unit

Eccentricity (e)

Value

0.182602

1-sigma variation

0.133430

Unit

Inclination (i)

Value

3.1118

1-sigma variation

2.3974

Unit

Long. of Ascending Node (Ω)

Value

247.5765

1-sigma variation

32.9391

Unit

Arg. of Perihelion (ω)

Value

125.9932

1-sigma variation

28.6544

Unit

Mean Anomaly (M)

Value

128.24179

1-sigma variation

1029.66000

Unit

Perihelion distance

Value

0.905026

1-sigma variation

Unit

Aphelion distance

Value

1.309380

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.185369

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.019720

1-sigma variation

Unit

MOID

Value

0.006805

1-sigma variation

Unit

Orbit Period

Value

425.5389

1-sigma variation

Unit

U parameter

Value

9.0

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	5.28323E-2	3.06530E-2	5.50774E-1	7.57107E0	6.58118E0	-2.36671E2
e	3.06530E-2	1.78035E-2	3.19891E-1	4.39202E0	3.81347E0	-1.37311E2
i	5.50774E-1	3.19891E-1	5.74777E0	7.89159E1	6.85211E1	-2.46721E3
Ω	7.57107E0	4.39202E0	7.89159E1	1.08499E3	9.43285E2	-3.39159E4
ω	6.58118E0	3.81347E0	6.85211E1	9.43285E2	8.21077E2	-2.94824E4
M	-2.36671E2	-1.37311E2	-2.46721E3	-3.39159E4	-2.94824E4	1.06020E6

Date of computation: 2025-02-19 13:28 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

24.759

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

30 - 70*

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

2990

Unit

Source

[1]

Normalized RMS of residuals

Value

0.220733

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2017-01-03.52485

Unit

Source

[2]

Last Observation

Value

2017-01-04.563112

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

5 (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 2017AE21 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	1953-07-26 12:05	> 1 mo	0.0513542	0.0425751	63.9251271
EARTH	1960-07-26 05:47	> 1 mo	0.0517452	0.0425821	28.3682060
EARTH	1967-07-29 09:15	> 1 mo	0.0587838	0.0421351	23.8657331
EARTH	1974-08-13 08:18	> 1 mo	0.0809978	0.0425288	21.1321268
EARTH	1981-09-11 18:45	> 1 mo	0.1016942	0.0671480	4.8178557
EARTH	1988-06-16 07:51	> 1 mo	0.1850018	0.0881437	6.0597242
EARTH	1988-10-07 07:41	> 1 mo	0.1031937	0.0779349	1.0712064
EARTH	1989-01-06 01:15	> 1 mo	0.1747245	0.0255804	7.0484102
EARTH	1995-11-01 10:04	> 1 mo	0.0863098	0.0307310	3.7625538
EARTH	2002-11-18 00:49	> 1 mo	0.0646257	0.0146820	16.0343521
EARTH	2009-11-14 09:27	> 1 mo	0.0698589	0.0175826	11.6302575
EARTH	2016-10-24 19:31	> 1 mo	0.0929296	0.0159106	0.0570034
EARTH	2023-06-18 22:00	> 1 mo	0.1760713	0.0698290	11.1228849
EARTH	2023-09-30 21:20	> 1 mo	0.1056643	0.0855519	1.0405828
EARTH	2024-01-12 21:26	> 1 mo	0.1861242	0.0245044	11.4068969
EARTH	2030-09-04 02:18	> 1 mo	0.0994103	0.0562501	8.4150073
EARTH	2037-08-04 23:08	> 1 mo	0.0751953	0.0398463	25.4198476
EARTH	2044-07-25 07:17	> 1 mo	0.0562841	0.0413364	23.6985996
EARTH	2051-07-24 12:52	> 1 mo	0.0515287	0.0417863	31.2040996
EARTH	2058-07-25 03:15	> 1 mo	0.0543678	0.0416441	79.4317762
EARTH	2065-07-31 06:32	> 1 mo	0.0686583	0.0406293	210.3907310
EARTH	2072-08-26 22:50	> 1 mo	0.0939746	0.0482654	171.4890689
EARTH	2079-06-23 13:31	> 1 mo	0.1662317	0.0684145	370.3956514
EARTH	2079-09-23 18:33	> 1 mo	0.1047861	0.0889336	7.3622645
EARTH	2080-01-14 18:54	> 1 mo	0.1948630	0.0226704	325.5968090
EARTH	2086-10-18 21:27	> 1 mo	0.0956470	0.0449975	142.2557824
EARTH	2093-11-09 19:05	> 1 mo	0.0723723	0.0179518	176.8556368
EARTH	2100-11-17 10:08	> 1 mo	0.0619489	0.0177722	68.2096583
EARTH	2107-11-03 07:54	> 1 mo	0.0822127	0.0286909	194.8939855
EARTH	2114-06-09 14:32	> 1 mo	0.1932645	0.0788322	277.4512769
EARTH	2114-10-09 18:49	> 1 mo	0.1021472	0.0647732	92.8397440
EARTH	2114-12-28 10:38	> 1 mo	0.1663001	0.0265653	400.7054153
EARTH	2121-09-13 12:39	> 1 mo	0.1042688	0.0776983	60.3997012

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
51.88172164	332.79022454	0.00645611	MINIMUM
294.29817339	196.23399095	0.04327845	MINIMUM
350.40660247	261.24945762	0.10557116	SADDLE
174.72345706	86.58755004	0.31446362	SADDLE
354.01707490	85.59492692	1.90361044	SADDLE
176.16635812	267.78685768	2.30848347	MAXIMUM

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MOID Plots

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

Level lines of the squared distance function

2017AE21

Date in UTC	MJD	σ	σ_imp	Distance ± Width in RE	Stretching in RE/σ	IP	Exp. energy	PS
2024-05-09.603	60439.603	-0.539	0.100	2.53 ± 8.730	1.89E5	1.19E-6	1.06E-6	n/a
2025-05-09.868	60804.868	-0.537	0.000	1.91 ± 9.046	3.13E5	9.52E-7	8.61E-7	-3.81
2025-05-10.206	60805.206	-0.534	0.000	1.89 ± 1.276	1.68E5	7.11E-6	6.45E-6	-2.94
2039-12-17.561	66139.561	1.430	0.000	0.20 ± 42.541	2.15E7	3.87E-10	1.75E-9	-8.55
2051-01-28.682	70199.682	-3.135	0.000	0.76 ± 6.900	7.82E5	1.74E-9	8.25E-10	-8.92
2052-05-08.827	70665.827	-0.554	0.265	2.33 ± 3.103	1.21E7	4.27E-10	3.77E-10	-9.33
2060-05-08.259	73587.259	-0.539	0.000	2.35 ± 18.288	3.25E8	4.62E-10	4.18E-10	-9.40
2073-05-06.334	78333.334	-0.577	0.000	1.87 ± 8.962	2.33E7	1.25E-8	1.11E-8	-8.11
2073-12-20.538	78561.538	1.868	0.170	1.25 ± 7.979	5.77E7	1.17E-10	1.05E-9	-9.34
2076-05-07.846	79430.846	-0.556	0.260	2.54 ± 6.838	2.62E7	1.14E-10	1.00E-10	-10.18
2078-05-06.270	80159.270	-0.581	0.000	1.56 ± 9.760	7.62E7	3.54E-9	3.15E-9	-8.70
2088-05-07.989	83813.989	-0.549	0.106	1.06 ± 27.601	4.72E7	5.40E-10	4.77E-10	-9.59
2119-12-18.054	95359.054	1.290	0.397	1.48 ± 10.230	6.71E6	1.31E-11	5.28E-11	-10.85
2119-12-18.067	95359.067	1.291	0.424	1.47 ± 10.719	4.50E6	1.70E-11	6.87E-11	-10.73


Based on 5 optical observations (of which 0 are rejected as outliers) from 2017/01/03.525 to 2017/01/04.563.
Coordinates are given on the Target Plane.
Unit is one Earth radius, but impact cross section has radius between 1.61 and 1.61 Earth radii.
Coordinates for LOV = CAR scaled= 1 second= F.
AstOD software version= 4.0, Date of computation=20250305 082708.359 UTC.

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Download Impactor Table as: