Asteroids

1999XS35 help

Last update: 2026-06-04 23:11 UTC

Orbital Properties

Epoch

61200.0

MJD

Orbit type

Apollo

Perihelion (q)

0.944

Aphelion (Q)

34.695

Eccentricity (e)

0.947

Inclination (i)

19.6

deg

Orbit period (P)

27475.7

Earth MOID

0.00469

U parameter

5.0

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)

17.4

mag

Diameter

900 - 1900*

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

1999-12-02

Observatory

Lowell Observatory-LONEOS

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

17.819684

1-sigma variation

0.008759

Unit

Eccentricity (e)

Value

0.947004

1-sigma variation

0.000023

Unit

Inclination (i)

Value

19.5665

1-sigma variation

0.0001

Unit

Long. of Ascending Node (Ω)

Value

48.8916

1-sigma variation

0.0011

Unit

Arg. of Perihelion (ω)

Value

333.2093

1-sigma variation

0.0010

Unit

Mean Anomaly (M)

Value

127.31124

1-sigma variation

0.09321

Unit

Perihelion distance

Value

0.944366

1-sigma variation

Unit

Aphelion distance

Value

34.695001

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.005795

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

10.886372

1-sigma variation

Unit

MOID

Value

0.004688

1-sigma variation

Unit

Orbit Period

Value

27475.6779

1-sigma variation

Unit

U parameter

Value

5.0

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	7.67244E-5	2.01272E-7	-6.46433E-7	6.47048E-6	-5.48636E-6	-8.16484E-4
e	2.01272E-7	5.28076E-10	-1.68086E-9	1.72070E-8	-1.45998E-8	-2.14189E-6
i	-6.46433E-7	-1.68086E-9	1.10163E-8	-5.29686E-9	1.27902E-9	6.87860E-6
Ω	6.47048E-6	1.72070E-8	-5.29686E-9	1.28525E-6	-1.10036E-6	-6.88677E-5
ω	-5.48636E-6	-1.45998E-8	1.27902E-9	-1.10036E-6	9.60355E-7	5.83931E-5
M	-8.16484E-4	-2.14189E-6	6.87860E-6	-6.88677E-5	5.83931E-5	8.68883E-3

Date of computation: 2026-06-04 23:11 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

17.434

Unit

mag

Source

[1]

Slope Parameter (G)

Value

0.15**

Unit

Source

[1]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

0.05 - 0.25

Unit

Source

[2]

Diameter

Value

900 - 1900*

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

9618

Unit

Source

[1]

Normalized RMS of residuals

Value

0.506989

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

1999-12-02.41509

Unit

Source

[2]

Last Observation

Value

2000-02-28.23541

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

213 (2)

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 1999XS35 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	1999-11-05 23:02	1.9	0.0453904	0.0453820	0.0000028

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
4.47405223	308.27648845	0.00009356	MINIMUM
359.13744664	98.11752881	1.93594491	SADDLE
179.96453659	102.09435773	33.70161998	SADDLE
180.01579688	282.10269320	35.68009036	MAXIMUM

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MOID Plots

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