Asteroids

433953 1997XR2 help

Last update: 2025-12-29 13:01 UTC

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Apollo

Perihelion (q)

0.860

Aphelion (Q)

1.293

Eccentricity (e)

0.201

Inclination (i)

7.2

deg

Orbit period (P)

408.0

Earth MOID

0.00110

U parameter

0.0

Next Earth close approach

Date

2035-11-22

Nominal distance (from Earth center)

0.13021

19479852

Maximum Brightness

18.8

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

20.9

mag

Diameter

200

Taxonomic type

Rotation period (T)

Discovery Information

Discovery Date

1997-12-04

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

61000.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

1.076522

1-sigma variation

8.360E-10

Unit

Eccentricity (e)

Value

0.200856

1-sigma variation

2.208E-8

Unit

Inclination (i)

Value

7.1911

1-sigma variation

2.191E-6

Unit

Long. of Ascending Node (Ω)

Value

250.6237

1-sigma variation

6.331E-6

Unit

Arg. of Perihelion (ω)

Value

84.5180

1-sigma variation

6.670E-6

Unit

Mean Anomaly (M)

Value

84.76762

1-sigma variation

2.377E-6

Unit

Perihelion distance

Value

0.860296

1-sigma variation

Unit

Aphelion distance

Value

1.292748

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

-0.002107

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.067509

1-sigma variation

Unit

MOID

Value

0.001101

1-sigma variation

Unit

Orbit Period

Value

407.9744

1-sigma variation

Unit

U parameter

Value

0.0

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	6.98814E-19	-1.74877E-17	2.89032E-16	2.21157E-15	-2.04804E-15	-1.24123E-15
e	-1.74877E-17	4.87464E-16	-6.52725E-15	-4.47088E-14	3.34823E-14	2.45421E-14
i	2.89032E-16	-6.52725E-15	4.80054E-12	-8.02572E-12	6.25325E-12	3.44127E-13
Ω	2.21157E-15	-4.47088E-14	-8.02572E-12	4.00834E-11	-3.93042E-11	-7.97317E-12
ω	-2.04804E-15	3.34823E-14	6.25325E-12	-3.93042E-11	4.44954E-11	5.26860E-12
M	-1.24123E-15	2.45421E-14	3.44127E-13	-7.97317E-12	5.26860E-12	5.65063E-12

Date of computation: 2025-12-29 13:01 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

[1]

Taxonomy (all)

Value

Unit

Source

[2]

Absolute Magnitude (H)
Slope Parameter (G)

H / G

Value

Unit

Source

Absolute Magnitude (H)

Value

20.933

Unit

mag

Source

[3]

Slope Parameter (G)

Value

0.15**

Unit

Source

[3]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

0.11

Unit

Source

[4]

Diameter

Value

200

Unit

Source

[4]

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

[5]

Download this part as:

Sources

No.	Name	Additional
[1]	EARN	1.) Michaël Marsset et al 2022 AJ 163 165
[2]	EARN	Earth Asteroids Research Node: https://earn.dlr.de
[3]	ESA Aegis	ESA orbit determination and impact monitoring system
[4]	EARN	1.) Nugent, C.R. et al. (2016) Astron. J. 152_63 (12pp) (NEOWISE Reactivation Mission Year Two: Asteroid Diameters and Albedos) (207 NEOs)
[5]	EARN	1.) href="http://echo.jpl.nasa.gov/asteroids/index.html">JPL's NEO Radar Detection Program Webpage

Observational Information

Arc Length
Unobserved
Normalized RMS of residuals

Arc Information

Value

Unit

Source

Arc Length

Value

10251

Unit

Source

[1]

Unobserved

Value

Unit

Source

[1]

Normalized RMS of residuals

Value

0.663572

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

1997-12-04.23858

Unit

Source

[2]

Last Observation

Value

2025-12-28.525209

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

558 (4)

Unit

Source

[1]

Radar Summary

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

Radar

Value

Unit

Source

First Observation

Value

2016-11-16

Unit

Source

[3]

Last Observation

Value

2016-12-06

Unit

Source

[3]

Delay (Discarded)

Value

6 (2)

Unit

Source

[1]

Doppler (Discarded)

Value

2 (0)

Unit

Source

[1]

Total Radar Observations (Discarded)

Value

8 (2)

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

Close Approaches for 433953 1997XR2 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	1959-11-21 17:22	< 1 min	0.1254215	0.1254202	0.0000004
EARTH	1968-06-14 20:04	< 1 min	0.1053831	0.1053818	0.0000004
EARTH	1978-11-19 02:06	< 1 s	0.0470578	0.0470572	0.0000002
EARTH	1987-07-13 19:19	< 1 min	0.1547306	0.1547302	0.0000001
EARTH	1996-05-22 18:45	< 1 s	0.1760410	0.1760406	0.0000001
EARTH	1997-11-19 09:19	< 1 s	0.0361819	0.0361819	0.0000000
EARTH	2006-07-14 01:21	< 1 min	0.1556646	0.1556644	0.0000001
EARTH	2015-05-22 17:00	< 1 s	0.1939072	0.1939070	0.0000001
EARTH	2016-11-18 15:04	< 1 s	0.0475601	0.0475601	0.0000000
EARTH	2025-06-14 23:02	< 1 min	0.1065407	0.1065406	0.0000001
EARTH	2035-11-22 22:31	< 1 min	0.1302148	0.1302144	0.0000001
EARTH	2044-06-02 18:23	< 1 s	0.0267511	0.0267508	0.0000001
EARTH	2054-11-18 00:27	< 1 s	0.0668742	0.0668731	0.0000004
EARTH	2063-07-24 07:56	< 1 min	0.1685883	0.1685873	0.0000003
EARTH	2072-05-26 04:26	< 1 min	0.0981989	0.0981960	0.0000010
EARTH	2073-11-21 16:57	< 1 min	0.0803447	0.0803423	0.0000008
EARTH	2082-09-13 06:10	< 1 min	0.1840076	0.1840075	0.0000000
EARTH	2091-06-06 01:07	< 1 min	0.0541615	0.0541592	0.0000008
EARTH	2100-05-24 01:21	< 1 min	0.1667582	0.1667566	0.0000005
EARTH	2101-11-20 14:39	< 1 min	0.0392351	0.0392344	0.0000003
EARTH	2110-10-17 04:15	< 1 min	0.1561949	0.1561931	0.0000006
EARTH	2110-11-29 12:45	< 1 min	0.1536283	0.1536261	0.0000007
EARTH	2119-08-05 03:39	< 1 min	0.1785372	0.1785365	0.0000002

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
286.52259194	148.40676479	0.00110104	MINIMUM
70.69463210	316.62382859	0.03359691	MINIMUM
358.74709447	233.18083839	0.19039259	SADDLE
178.80089388	52.19827612	0.33371940	SADDLE
356.12739731	49.88431380	1.84679619	SADDLE
176.78461828	230.54139168	2.29972683	MAXIMUM

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MOID Plots

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