Asteroids

163693 Atira help

Last update: 2025-05-21 08:47 UTC

Orbital Properties

Epoch

60800.0

MJD

Orbit type

Atira

Perihelion (q)

0.502

Aphelion (Q)

0.980

Eccentricity (e)

0.322

Inclination (i)

25.6

deg

Orbit period (P)

233.0

Earth MOID

0.20759

U parameter

0.0

Next Earth close approach

Date

Nominal distance (from Earth center)

Maximum Brightness

mag

Risk

Object is not in risk list

Object is not in priority list

Physical Properties

Absolute Magnitude (H)

16.4

mag

Diameter

4800

Taxonomic type

Rotation period (T)

3.399

Discovery Information

Discovery Date

2003-02-11

Observatory

Lincoln Laboratory ETS, New Mexico

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

0.740988

1-sigma variation

9.797E-10

Unit

Eccentricity (e)

Value

0.322113

1-sigma variation

8.514E-8

Unit

Inclination (i)

Value

25.6185

1-sigma variation

1.037E-5

Unit

Long. of Ascending Node (Ω)

Value

103.8704

1-sigma variation

1.629E-5

Unit

Arg. of Perihelion (ω)

Value

252.9340

1-sigma variation

7.319E-6

Unit

Mean Anomaly (M)

Value

88.21387

1-sigma variation

0.00002

Unit

Perihelion distance

Value

0.502307

1-sigma variation

Unit

Aphelion distance

Value

0.979670

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.250252

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.409519

1-sigma variation

Unit

MOID

Value

0.207589

1-sigma variation

Unit

Orbit Period

Value

232.9783

1-sigma variation

Unit

U parameter

Value

0.0

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	9.59790E-19	1.04459E-17	3.92338E-15	4.94723E-15	-2.70322E-15	-1.24783E-14
e	1.04459E-17	7.24796E-15	1.68238E-13	7.42931E-13	-2.93448E-13	-6.65674E-13
i	3.92338E-15	1.68238E-13	1.07463E-10	1.28076E-10	-6.74482E-11	-1.40942E-10
Ω	4.94723E-15	7.42931E-13	1.28076E-10	2.65468E-10	-1.04053E-10	-2.14776E-10
ω	-2.70322E-15	-2.93448E-13	-6.74482E-11	-1.04053E-10	5.35656E-11	8.82199E-11
M	-1.24783E-14	-6.65674E-13	-1.40942E-10	-2.14776E-10	8.82199E-11	3.22430E-10

Date of computation: 2025-05-21 08:47 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

3.399

Unit

Source

[1]

Quality

Value

2,B,R

Unit

Source

[1]

Amplitude

Value

0.4

Unit

mag

Source

[1]

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

16.366

Unit

mag

Source

[2]

Slope Parameter (G)

Value

0.15**

Unit

mag

Source

[2]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

0.05 - 0.25

Unit

Source

[-]

Diameter

Value

4800

Unit

Source

[3]

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

[4]

Satellites

Satellites

Value

Unit

Source

Satellites

Value

Binary Child 1

Unit

Source

[5]

Download this part as:

Sources

No.	Name	Additional
[1]	EARN	1.) Petr Pravec's Ondrejov NEO Photometric Program Webpage "Prepublished Periods"
[2]	ESA Aegis	ESA orbit determination and impact monitoring system
[3]	EARN	1.) Rivera-Valentin, E.G. et al. (2017) CBET HREF="http://www.cbat.eps.harvard.edu/iau/cbet/004300/CBET004347.txt">4347. (163693) ATIRA (binary detection)
[4]	EARN	1.) href="http://echo.jpl.nasa.gov/asteroids/index.html">JPL's NEO Radar Detection Program Webpage 2.) Rivera-Valentin, E.G. et al. (2017) CBET HREF="http://www.cbat.eps.harvard.edu/iau/cbet/004300/CBET004347.txt">4347. (163693) ATIRA (binary detection)
[5]	EARN	Earth Asteroids Research Node: https://earn.dlr.de

Observational Information

Arc Length
Unobserved
Normalized RMS of residuals

Arc Information

Value

Unit

Source

Arc Length

Value

7768

Unit

Source

[1]

Unobserved

Value

412

Unit

Source

[1]

Normalized RMS of residuals

Value

0.490074

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2003-02-11.4347

Unit

Source

[2]

Last Observation

Value

2024-05-18.954198

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

978 (3)

Unit

Source

[1]

Radar Summary

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

Radar

Value

Unit

Source

First Observation

Value

2017-01-20

Unit

Source

[3]

Last Observation

Value

2017-01-23

Unit

Source

[3]

Delay (Discarded)

Value

2 (0)

Unit

Source

[1]

Doppler (Discarded)

Value

0 (0)

Unit

Source

[-]

Total Radar Observations (Discarded)

Value

2 (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

Computation parameters

As seen from:

Initial Date: *

Final Date: *

Output option:

One line per time step

Time step:*

* - these fields are required

Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
107.18018006	16.94673299	0.20758890	MINIMUM
272.52041044	150.18907735	0.35092345	MINIMUM
201.67051854	88.94288256	0.43643287	SADDLE
5.59929475	263.44233449	0.58740389	SADDLE
0.61043524	75.73910553	1.46742804	SADDLE
170.50061788	244.53964361	1.94234719	MAXIMUM

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MOID Plots

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