Asteroids

7336 Saunders help

Last update: 2025-09-10 00:30 UTC

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Amor

Perihelion (q)

1.194

Aphelion (Q)

3.417

Eccentricity (e)

0.482

Inclination (i)

7.2

deg

Orbit period (P)

1278.7

Earth MOID

0.18884

U parameter

0.0

A₂

20.7

10^-15au/days²

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)

18.9

mag

Diameter

600

Taxonomic type

Rotation period (T)

4.307

Discovery Information

Discovery Date

1989-09-06

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

61000.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

2.305546

1-sigma variation

2.754E-9

Unit

Eccentricity (e)

Value

0.481957

1-sigma variation

2.124E-8

Unit

Inclination (i)

Value

7.2004

1-sigma variation

2.949E-6

Unit

Long. of Ascending Node (Ω)

Value

174.4158

1-sigma variation

1.189E-5

Unit

Arg. of Perihelion (ω)

Value

181.5469

1-sigma variation

1.586E-5

Unit

Mean Anomaly (M)

Value

118.34998

1-sigma variation

4.397E-6

Unit

Perihelion distance

Value

1.194373

1-sigma variation

Unit

Aphelion distance

Value

3.416719

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

2.420013

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.188906

1-sigma variation

Unit

MOID

Value

0.188845

1-sigma variation

Unit

Orbit Period

Value

1278.6719

1-sigma variation

Unit

U parameter

Value

0.0

1-sigma variation

Unit

A₂

Value

20.71055

1-sigma variation

5.43096

Unit

10^-15au/days²

Covariance Matrix

	a	e	i	Ω	ω	M	A₂
a	7.58477E-18	-1.48815E-18	2.00843E-16	-7.02732E-16	-1.20346E-15	-9.40544E-16	1.42309E-8
e	-1.48815E-18	4.50929E-16	-1.83331E-14	4.01688E-14	6.60286E-14	-2.57113E-14	-8.80263E-10
i	2.00843E-16	-1.83331E-14	8.69584E-12	-5.61634E-12	1.92726E-12	7.14360E-13	4.01363E-7
Ω	-7.02732E-16	4.01688E-14	-5.61634E-12	1.41279E-10	-1.01345E-10	-1.16027E-11	1.57668E-6
ω	-1.20346E-15	6.60286E-14	1.92726E-12	-1.01345E-10	2.51501E-10	-4.78054E-11	9.17314E-6
M	-9.40544E-16	-2.57113E-14	7.14360E-13	-1.16027E-11	-4.78054E-11	1.93294E-11	-5.88276E-6
A₂	1.42309E-8	-8.80263E-10	4.01363E-7	1.57668E-6	9.17314E-6	-5.88276E-6	2.94953E1

Date of computation: 2025-09-10 00:30 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

4.307

4.311

Unit

Source

[1]

[6]

Quality

Value

Unit

Source

[6]

Amplitude

Value

0.16

0.19-0.3

Unit

mag

Source

[1]

[6]

Rotation Direction

Value

Unit

Source

[-]

Spinvector L

Value

320

Unit

Source

[1]

Spinvector B

Value

Unit

Source

[1]

Taxonomy
Taxonomy (all)

Taxonomy

Value

Unit

Source

Taxonomy

Value

Unit

Source

[2]

[3]

Taxonomy (all)

Value

Sq,Sr,Q

Unit

Source

[4]

[5]

Absolute Magnitude (H)
Slope Parameter (G)

H / G

Value

Unit

Source

Absolute Magnitude (H)

Value

18.855

19.02

Unit

mag

Source

[7]

[8]

Slope Parameter (G)

Value

0.24

0.15**

Unit

mag

Source

[8]

[7]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

medium high

Unit

Source

[9]

Diameter

Value

600

Unit

Source

[9]

Color Index Information

Color Index Information

Value

Unit

Source

Color Index Information

Value

Unit

mag

Source

[-]

Sightings

Sightings

Value

Unit

Source

Sightings

Value

Visual S

Unit

Source

[10]

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Sources

No.	Name	Additional
[1]	EARN	1.) Lowell Observatory Near-Earth Asteroid Photometric Survey (NEAPS): Paper 3. Skiff, Brian A et al.
[2]	EARN	1.) Alexey V. Sergeyev and Benoit Carry A&A, 652 (2021) A59
[3]	EARN	1.) DeMeo, F.E. et al. (2014) Icarus 227, 112-122. (Mars encounters cause fresh surfaces on some near-Earth asteroids) (contains taxonomic classification of 249 NEAs)
[4]	EARN	Earth Asteroids Research Node: https://earn.dlr.de
[5]	EARN	1.) Bus, S.J. & Binzel, R.P. (2002) Icarus 158,106-145. (Phase II of the Small Main-Belt Asteroid Spectrographic Survey: A Feature-Based Taxonomy.) 2.) Binzel, R.P. et al. (2004) Icarus 170, 259-294. (Observed spectral properties of near-Earth objects: results for population distribution, source regions, and space weathering processes.) 3.) Lazzarin, M., Marchi,S. & Magrin, S. (2010) href="http://www.astro.unipd.it/planets/sineo/data.html"> SINEO Database (Spectroscopic Investiation of Near-Earth Objects) 4.) DeMeo, F.E. et al. (2014) Icarus 227, 112-122. (Mars encounters cause fresh surfaces on some near-Earth asteroids) (contains taxonomic classification of 249 NEAs)
[6]	EARN	1.) Warner, B.D. (2018) MPB 45, 138-147. (NEAR-EARTH ASTEROID LIGHTCURVE ANALYSIS AT CS3-PALMER DIVIDE STATION: 2017 OCTOBER-DECEMBER)(20 NEAs) 2.) Petr Pravec's Ondrejov NEO Photometric Program Webpage "Prepublished Periods" 3.) Mottola, S. et al. (1995) Icarus 117, 62-70. (The near-earth objects follow-up program: First results.)(1981, 2062,4953,5633,5797,5836,1993BX3,1994AW1,1994JF1,1994LC1) 4.) Hoffmann, M. et al. (1993) Acta Astronomica 43, 61-67. (Photometric observations of four near-earth asteroids)
[7]	ESA Aegis	ESA orbit determination and impact monitoring system
[8]	EARN	1.) Pravec, P. et al. (2012) Icarus 221, 365-387 (Absolute magnitudes of asteroids and a revision of asteroid albedo estimates from WISE thermal observations)
[9]	EARN	1.) Binzel, R.P. et al. (2002) in "Asteroids III" (Eds. W.F.Bottke et al.), Univ.Ariz.Press, Tucson, USA, pp. 255-271. (Physical Properties of NEOs)
[10]	EARN	1.) Bus, S.J. & Binzel, R.P. (2002) Icarus 158,106-145. (Phase II of the Small Main-Belt Asteroid Spectrographic Survey: A Feature-Based Taxonomy.) 2.) Binzel, R.P. et al. (2004) Icarus 170, 259-294. (Observed spectral properties of near-Earth objects: results for population distribution, source regions, and space weathering processes.) 3.) Lazzarin, M., Marchi,S. & Magrin, S. (2010) href="http://www.astro.unipd.it/planets/sineo/data.html"> SINEO Database (Spectroscopic Investiation of Near-Earth Objects)

Observational Information

Arc Length
Unobserved
Normalized RMS of residuals

Arc Information

Value

Unit

Source

Arc Length

Value

15430

Unit

Source

[1]

Unobserved

Value

274

Unit

Source

[1]

Normalized RMS of residuals

Value

0.449142

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

1982-10-20.47248

Unit

Source

[2]

Last Observation

Value

2025-01-17.229236

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

1405 (12)

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 7336 Saunders 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	1968-09-15 22:07	< 1 min	0.1958131	0.1958123	0.0000003
EARTH	1975-09-16 09:23	< 1 min	0.1925734	0.1925731	0.0000001
EARTH	1996-09-16 01:21	< 1 min	0.1937030	0.1937028	0.0000000
EARTH	2003-09-16 19:48	< 1 min	0.1902733	0.1902732	0.0000000

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
358.73179074	252.37797103	0.19077452	MINIMUM
358.65204010	72.23619658	2.19047685	SADDLE
179.54426259	73.22720919	2.42202567	SADDLE
179.51614994	253.20826313	4.42172330	MAXIMUM

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MOID Plots

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