Asteroids

5496 1973NA help

Last update: 2026-08-04 13:05 UTC

Orbital Properties

Epoch

61200.0

MJD

Orbit type

Apollo

Perihelion (q)

0.891

Aphelion (Q)

3.981

Eccentricity (e)

0.634

Inclination (i)

68.0

deg

Orbit period (P)

1388.8

Earth MOID

0.09595

U parameter

0.0

Next Earth close approach

Date

Nominal distance (from Earth center)

Maximum Brightness

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

16.2

mag

Diameter

1880

Taxonomic type

Rotation period (T)

2.855

Discovery Information

Discovery Date

1973-07-04

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

2.436136

1-sigma variation

4.753E-9

Unit

Eccentricity (e)

Value

0.634060

1-sigma variation

6.885E-8

Unit

Inclination (i)

Value

68.0105

1-sigma variation

2.374E-5

Unit

Long. of Ascending Node (Ω)

Value

101.0215

1-sigma variation

8.138E-6

Unit

Arg. of Perihelion (ω)

Value

117.9206

1-sigma variation

1.252E-5

Unit

Mean Anomaly (M)

Value

351.03050

1-sigma variation

0.00001

Unit

Perihelion distance

Value

0.891480

1-sigma variation

Unit

Aphelion distance

Value

3.980791

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

1.088409

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.106405

1-sigma variation

Unit

MOID

Value

0.095948

1-sigma variation

Unit

Orbit Period

Value

1388.8349

1-sigma variation

Unit

U parameter

Value

0.0

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	2.25902E-17	-1.14898E-16	-3.01530E-14	-2.86738E-15	2.41827E-15	-2.47826E-14
e	-1.14898E-16	4.74086E-15	-6.01068E-15	7.62541E-15	5.28841E-13	-3.25188E-15
i	-3.01530E-14	-6.01068E-15	5.63610E-10	-8.76722E-11	3.27008E-11	6.32709E-12
Ω	-2.86738E-15	7.62541E-15	-8.76722E-11	6.62254E-11	-3.08193E-11	9.85971E-12
ω	2.41827E-15	5.28841E-13	3.27008E-11	-3.08193E-11	1.56853E-10	-5.28700E-11
M	-2.47826E-14	-3.25188E-15	6.32709E-12	9.85971E-12	-5.28700E-11	5.85076E-11

Date of computation: 2026-08-04 13:05 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

2.855

Unit

Source

[5]

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

X:C

Unit

Source

[3]

[4]

Absolute Magnitude (H)
Slope Parameter (G)

H / G

Value

Unit

Source

Absolute Magnitude (H)

Value

16.223

Unit

mag

Source

[6]

Slope Parameter (G)

Value

0.15**

Unit

Source

[6]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

0.05

Unit

Source

[2]

Diameter

Value

1880

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

[-]

Download this part as:

Sources

No.	Name	Additional
[1]	EARN	1.) Thomas, C.A. et al. (2014) Icarus 228, 217-246. (Physical characterization of Warm Spitzer-observed near-Earth objects)
[2]	EARN	1.) N. G. Simion et al, Spectral properties of near-Earth objects with low-Jovian Tisserand invariant (2021)
[3]	EARN	1.) DeMeo, F. & R.P. Binzel (2008) Icarus 194, 436-449. (Comets in the near-Earth object population) () 2.) Thomas, C.A. et al. (2014) Icarus 228, 217-246. (Physical characterization of Warm Spitzer-observed near-Earth objects)
[4]	EARN	Earth Asteroids Research Node: https://earn.dlr.de
[5]	EARN	1.) Skiff, B.A. (2011) Posting on CALL web site. http://www.minorplanet.info/call.html
[6]	ESA Aegis	ESA orbit determination and impact monitoring system

Observational Information

Arc Length
Unobserved
Normalized RMS of residuals

Arc Information

Value

Unit

Source

Arc Length

Value

19388

Unit

Source

[1]

Unobserved

Value

Unit

Source

[1]

Normalized RMS of residuals

Value

0.515451

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

1973-07-04.27153

Unit

Source

[2]

Last Observation

Value

2026-08-03.295494

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

324 (11)

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

Filters

Initial Date: *

Final Date: *

Normalised Only accepted

Max residual (arcsec):

* - these fields are required

Plot

Computation parameters

As seen from:

Initial Date: *

Final Date: *

Output option:

One line per time step

Time step:*

* - these fields are required

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 5496 1973NA 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	1954-07-04 20:44	< 1 min	0.1007272	0.1007254	0.0000006
EARTH	1973-07-02 07:37	< 1 min	0.0798422	0.0798415	0.0000002
EARTH	1992-06-26 22:30	< 1 min	0.1522809	0.1522800	0.0000003

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
30.38497639	175.65808204	0.09594791	MINIMUM
308.43675658	7.21561876	0.71222681	MINIMUM
345.49172281	78.15780270	1.08323654	SADDLE
349.79105248	281.02703060	1.59442800	SADDLE
168.20644266	314.59054008	3.54294517	SADDLE
189.81487123	146.46222326	4.65888085	MAXIMUM

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MOID Plots

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