Asteroids

85182 1991AQ help

Last update: 2026-07-30 09:40 UTC

Orbital Properties

Epoch

61200.0

MJD

Orbit type

Apollo

Perihelion (q)

0.494

Aphelion (Q)

3.947

Eccentricity (e)

0.778

Inclination (i)

3.1

deg

Orbit period (P)

1208.3

Earth MOID

0.01597

U parameter

0.0

Next Earth close approach

Date

2034-01-21

Nominal distance (from Earth center)

0.08424

12602325

Maximum Brightness

15.1

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

17.2

mag

Diameter

1098

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

1991-01-14

Observatory

Palomar Mountain

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

61200.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

2.220180

1-sigma variation

1.868E-9

Unit

Eccentricity (e)

Value

0.777567

1-sigma variation

9.685E-9

Unit

Inclination (i)

Value

3.1187

1-sigma variation

4.177E-6

Unit

Long. of Ascending Node (Ω)

Value

339.3739

1-sigma variation

0.0001

Unit

Arg. of Perihelion (ω)

Value

243.2458

1-sigma variation

0.0001

Unit

Mean Anomaly (M)

Value

238.12486

1-sigma variation

3.448E-6

Unit

Perihelion distance

Value

0.493842

1-sigma variation

Unit

Aphelion distance

Value

3.946518

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.340562

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.340075

1-sigma variation

Unit

MOID

Value

0.015970

1-sigma variation

Unit

Orbit Period

Value

1208.3164

1-sigma variation

Unit

U parameter

Value

0.0

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	3.49061E-18	8.99131E-18	8.61159E-18	5.18561E-14	-4.71968E-14	-1.46269E-15
e	8.99131E-18	9.38069E-17	-9.80672E-15	-2.05787E-13	2.24019E-13	-1.15025E-14
i	8.61159E-18	-9.80672E-15	1.74446E-11	-7.45626E-11	7.58437E-11	-1.45935E-12
Ω	5.18561E-14	-2.05787E-13	-7.45626E-11	3.73209E-9	-3.69683E-9	-2.89612E-11
ω	-4.71968E-14	2.24019E-13	7.58437E-11	-3.69683E-9	3.66901E-9	2.40916E-11
M	-1.46269E-15	-1.15025E-14	-1.45935E-12	-2.89612E-11	2.40916E-11	1.18885E-11

Date of computation: 2026-07-30 09:40 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

[5]

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]

[2]

Taxonomy (all)

Value

Sq;Q,U

Unit

Source

[3]

[4]

Absolute Magnitude (H)
Slope Parameter (G)

H / G

Value

Unit

Source

Absolute Magnitude (H)

Value

17.2

17.203

Unit

mag

Source

[5]

[6]

Slope Parameter (G)

Value

0.23

0.15**

Unit

Source

[5]

[6]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

0.212

Unit

Source

[7]

Diameter

Value

1098

Unit

Source

[7]

Color Index Information

Color Index Information

Value

Unit

Source

Color Index Information

Value

Unit

mag

Source

[-]

Sightings

Sightings

Value

Unit

Source

Sightings

Value

Radar R

Unit

Source

[8]

Download this part as:

Sources

No.	Name	Additional
[1]	EARN	1.) Alexey V. Sergeyev and Benoit Carry A&A, 652 (2021) A59
[2]	EARN	1.) Somers, J.M. et al. (2010) DPS 42, 1316. (abstract) (Optical Characterization Of Planetary Radar Targets, Low-deltaV, And Potentially Hazardous Asteroids: Results From 2009-2010)
[3]	EARN	Earth Asteroids Research Node: https://earn.dlr.de
[4]	EARN	1.) Somers, J.M. et al. (2010) DPS 42, 1316. (abstract) (Optical Characterization Of Planetary Radar Targets, Low-deltaV, And Potentially Hazardous Asteroids: Results From 2009-2010) 2.) Wisniewski, W.Z. et al. (1997) Icarus 126, 395-449. (Photometric Observations of 125 Asteroids)
[5]	EARN	1.) Wisniewski, W.Z. et al. (1997) Icarus 126, 395-449. (Photometric Observations of 125 Asteroids)
[6]	ESA Aegis	ESA orbit determination and impact monitoring system
[7]	EARN	1.) Mainzer, A. et al. (2014) Astrophys. J. 792, 30. (Initial Performance of the NEOWISE Reactivation Mission) (prel.diameters & albedos for 61 NEOs) 2.) Nugent, C.R. et al. (2015) Astrophys. J. 814_117 (13pp) (NEOWISE Reactivation Mission Year One: Preliminary Asteroid Diameters and Albedos)(201 NEOs)
[8]	EARN	1.) MPC Database of astrometric positions.

Observational Information

Arc Length
Unobserved
Normalized RMS of residuals

Arc Information

Value

Unit

Source

Arc Length

Value

12373

Unit

Source

[1]

Unobserved

Value

715

Unit

Source

[1]

Normalized RMS of residuals

Value

0.577892

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

1991-01-14.39792

Unit

Source

[2]

Last Observation

Value

2024-11-29.252032

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

788 (6)

Unit

Source

[1]

Radar Summary

First Observation
Last Observation
Delay (Discarded)
Doppler (Discarded)
Total Optical Observations (Discarded)

Radar

Value

Unit

Source

First Observation

Value

1991-01-28

Unit

Source

[3]

Last Observation

Value

1991-01-31

Unit

Source

[3]

Delay (Discarded)

Value

5 (0)

Unit

Source

[1]

Doppler (Discarded)

Value

3 (0)

Unit

Source

[1]

Total Radar Observations (Discarded)

Value

8 (0)

Unit

Source

[1]

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
[3]	JPL Radar Observations	Jet Propulsion Laboratory: https://ssd.jpl.nasa.gov/dat/radar_data_ast.txt

Filters

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Normalised Only accepted

Max residual (arcsec):

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Computation parameters

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Final Date: *

Output option:

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Note: Ephemerides requests are limited to a maximum of 1000 points and a final date not exceeding 2040/12/31 00:00.

Close Approaches for 85182 1991AQ from 1950 to 2126

Body	Date in UTC	Time uncert. in min	Nominal distance in au	Min. possible distance in au	Distance uncert. in au
EARTH	1951-08-18 08:42	< 1 min	0.0618362	0.0618350	0.0000004
EARTH	1991-01-27 10:32	< 1 s	0.0541601	0.0541601	0.0000000
EARTH	1994-08-17 21:46	< 1 s	0.0542464	0.0542460	0.0000001
MARS	2011-03-16 13:35	< 1 s	0.0428943	0.0428940	0.0000001
EARTH	2034-01-21 07:43	< 1 s	0.0842413	0.0842408	0.0000002
MERCURY	2034-03-10 09:54	< 1 min	0.0458165	0.0458164	0.0000000
EARTH	2037-08-19 17:19	< 1 s	0.0836671	0.0836667	0.0000001
EARTH	2077-02-05 17:15	< 1 min	0.1897857	0.1897848	0.0000003
EARTH	2080-08-25 23:22	< 1 min	0.1968480	0.1968470	0.0000004

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
45.67683952	218.77562752	0.01597021	MINIMUM
315.80338332	20.05091166	0.03049677	MINIMUM
1.45896762	120.63217104	0.51560280	SADDLE
1.37171997	300.40971656	1.48535145	SADDLE
180.18903935	298.46228945	2.95592623	SADDLE
180.16223662	118.45619533	4.95354401	MAXIMUM

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MOID Plots

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