Asteroids

2017AE21 help

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

Orbital Properties

Epoch

61000.0

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

0.00677

U parameter

9.0

Next Earth close approach

Date

2030-09-04

Nominal distance (from Earth center)

0.09941

14871634

Maximum Brightness

26.6

mag

Risk

Object is in risk list

Physical Properties

Absolute Magnitude (H)

24.8

mag

Diameter

29 - 60*

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

61000.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

1.107216

1-sigma variation

0.229986

Unit

Eccentricity (e)

Value

0.182575

1-sigma variation

0.133463

Unit

Inclination (i)

Value

3.1119

1-sigma variation

2.3986

Unit

Long. of Ascending Node (Ω)

Value

247.5743

1-sigma variation

32.9149

Unit

Arg. of Perihelion (ω)

Value

125.9891

1-sigma variation

28.5923

Unit

Mean Anomaly (M)

Value

297.44381

1-sigma variation

1082.16000

Unit

Perihelion distance

Value

0.905066

1-sigma variation

Unit

Aphelion distance

Value

1.309365

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.183579

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.019627

1-sigma variation

Unit

MOID

Value

0.006767

1-sigma variation

Unit

Orbit Period

Value

425.5462

1-sigma variation

Unit

U parameter

Value

9.0

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	5.28936E-2	3.06785E-2	5.51369E-1	7.56988E0	6.57070E0	-2.48881E2
e	3.06785E-2	1.78124E-2	3.20131E-1	4.38988E0	3.80614E0	-1.44348E2
i	5.51369E-1	3.20131E-1	5.75352E0	7.88973E1	6.84064E1	-2.59430E3
Ω	7.56988E0	4.38988E0	7.88973E1	1.08339E3	9.40543E2	-3.56188E4
ω	6.57070E0	3.80614E0	6.84064E1	9.40543E2	8.17520E2	-3.09182E4
M	-2.48881E2	-1.44348E2	-2.59430E3	-3.56188E4	-3.09182E4	1.17107E6

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

24.827

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

29 - 60*

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

3246

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 12:06	> 1 mo	0.0513577	0.0425748	63.9237661
EARTH	1960-07-26 05:48	> 1 mo	0.0517468	0.0425820	28.3673458
EARTH	1967-07-29 09:16	> 1 mo	0.0587851	0.0421350	23.8650164
EARTH	1974-08-13 08:20	> 1 mo	0.0809990	0.0425291	21.1303573
EARTH	1981-09-11 18:46	> 1 mo	0.1016945	0.0671491	4.8172845
EARTH	1988-06-16 07:50	> 1 mo	0.1850022	0.0881450	6.0587731
EARTH	1988-10-07 07:41	> 1 mo	0.1031936	0.0779349	1.0710399
EARTH	1989-01-06 01:15	> 1 mo	0.1747241	0.0255804	7.0473069
EARTH	1995-11-01 10:04	> 1 mo	0.0863100	0.0307314	3.7628350
EARTH	2002-11-18 00:48	> 1 mo	0.0646266	0.0146824	16.0338693
EARTH	2009-11-14 09:26	> 1 mo	0.0698595	0.0175830	11.6297666
EARTH	2016-10-24 19:31	> 1 mo	0.0929296	0.0159106	0.0570016
EARTH	2023-06-18 22:00	> 1 mo	0.1760719	0.0698293	11.1224896
EARTH	2023-09-30 21:21	> 1 mo	0.1056642	0.0855514	1.0406223
EARTH	2024-01-12 21:26	> 1 mo	0.1861235	0.0245045	11.4066044
EARTH	2030-09-04 02:20	> 1 mo	0.0994107	0.0562512	8.4143979
EARTH	2037-08-04 23:10	> 1 mo	0.0751967	0.0398463	25.4187572
EARTH	2044-07-25 07:17	> 1 mo	0.0562854	0.0413363	23.6982043
EARTH	2051-07-24 12:53	> 1 mo	0.0515304	0.0417861	31.2027733
EARTH	2058-07-25 03:17	> 1 mo	0.0543721	0.0416438	79.4239639
EARTH	2065-07-31 06:42	> 1 mo	0.0686699	0.0406284	210.3033176
EARTH	2072-08-26 23:09	> 1 mo	0.0939840	0.0482760	171.2911047
EARTH	2079-06-23 13:15	> 1 mo	0.1662520	0.0684284	370.0435691
EARTH	2079-09-23 18:50	> 1 mo	0.1047865	0.0889369	7.2807749
EARTH	2080-01-14 18:42	> 1 mo	0.1948452	0.0226751	325.3914093
EARTH	2086-10-18 21:42	> 1 mo	0.0956392	0.0449804	142.1869233
EARTH	2093-11-09 19:16	> 1 mo	0.0723626	0.0179444	176.6535280
EARTH	2100-11-17 10:05	> 1 mo	0.0619527	0.0177655	68.3054270
EARTH	2107-11-03 07:41	> 1 mo	0.0822234	0.0287008	194.7257264
EARTH	2114-06-09 14:41	> 1 mo	0.1932493	0.0788250	277.2490044
EARTH	2114-10-09 18:34	> 1 mo	0.1021523	0.0647942	92.7001046
EARTH	2114-12-28 11:26	> 1 mo	0.1663221	0.0265565	400.1700497
EARTH	2121-09-13 12:23	> 1 mo	0.1042655	0.0776754	60.4108015

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
52.16649933	332.73851100	0.00680498	MINIMUM
294.40562963	195.98989921	0.04334546	MINIMUM
350.62494232	261.12271060	0.10581396	SADDLE
174.87659394	86.39786601	0.31412316	SADDLE
354.24593234	85.48094652	1.90391971	SADDLE
176.32622533	267.60275619	2.30879917	MAXIMUM

Download:

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	IP	Impact energy	PS
2039-12-17.561	66139.561	1.430	0.000	0.20 ± 42.541	2.15E7	3.87E-10	4.52E0	-8.54
2051-01-28.682	70199.682	-3.135	0.000	0.76 ± 6.900	7.82E5	1.74E-9	4.74E-1	-8.92
2052-05-08.827	70665.827	-0.554	0.265	2.33 ± 3.103	1.21E7	4.27E-10	8.83E-1	-9.33
2060-05-08.259	73587.259	-0.539	0.000	2.35 ± 18.288	3.25E8	4.62E-10	9.05E-1	-9.40
2073-05-06.334	78333.334	-0.577	0.000	1.87 ± 8.962	2.33E7	1.25E-8	8.88E-1	-8.11
2073-12-20.538	78561.538	1.868	0.170	1.25 ± 7.979	5.77E7	1.17E-10	8.97E0	-9.34
2076-05-07.846	79430.846	-0.556	0.260	2.54 ± 6.838	2.62E7	1.14E-10	8.77E-1	-10.18
2078-05-06.270	80159.270	-0.581	0.000	1.56 ± 9.760	7.62E7	3.54E-9	8.90E-1	-8.70
2088-05-07.989	83813.989	-0.549	0.106	1.06 ± 27.601	4.72E7	5.40E-10	8.83E-1	-9.59
2119-12-18.054	95359.054	1.290	0.397	1.48 ± 10.230	6.71E6	1.31E-11	4.03E0	-10.85
2119-12-18.067	95359.067	1.291	0.424	1.47 ± 10.719	4.50E6	1.70E-11	4.04E0	-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=20250805 130500.123 UTC.

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Download Impactor Table as: