Asteroids

488453 1994XD help

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

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Apollo

Perihelion (q)

0.624

Aphelion (Q)

4.064

Eccentricity (e)

0.734

Inclination (i)

4.3

deg

Orbit period (P)

1310.8

Earth MOID

0.02022

U parameter

0.0

A₂

21.8

10^-15au/days²

Next Earth close approach

Date

2041-06-13

Nominal distance (from Earth center)

0.01534

2294894

Maximum Brightness

12.8

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

19.2

mag

Diameter

400 - 900*

Taxonomic type

Rotation period (T)

2.736

Discovery Information

Discovery Date

1994-12-01

Observatory

Steward Observatory, Kitt Peak-Spacewatch

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

2.344038

1-sigma variation

2.194E-9

Unit

Eccentricity (e)

Value

0.733585

1-sigma variation

3.801E-9

Unit

Inclination (i)

Value

4.3303

1-sigma variation

5.453E-6

Unit

Long. of Ascending Node (Ω)

Value

96.0184

1-sigma variation

2.019E-5

Unit

Arg. of Perihelion (ω)

Value

249.5405

1-sigma variation

1.914E-5

Unit

Mean Anomaly (M)

Value

232.65171

1-sigma variation

3.453E-7

Unit

Perihelion distance

Value

0.624486

1-sigma variation

Unit

Aphelion distance

Value

4.063590

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.471361

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.156097

1-sigma variation

Unit

MOID

Value

0.020225

1-sigma variation

Unit

Orbit Period

Value

1310.8270

1-sigma variation

Unit

U parameter

Value

0.0

1-sigma variation

Unit

A₂

Value

21.84123

1-sigma variation

1.82877

Unit

10^-15au/days²

Covariance Matrix

	a	e	i	Ω	ω	M	A₂
a	4.81293E-18	3.26395E-18	-3.95178E-15	1.77197E-14	-1.78374E-14	-7.33596E-16	3.44155E-9
e	3.26395E-18	1.44505E-17	-1.79982E-14	6.76067E-14	-6.35433E-14	-7.14794E-16	3.41645E-9
i	-3.95178E-15	-1.79982E-14	2.97313E-11	-1.09624E-10	1.03686E-10	9.78897E-13	-6.34683E-6
Ω	1.77197E-14	6.76067E-14	-1.09624E-10	4.07460E-10	-3.86130E-10	-4.04386E-12	2.50006E-5
ω	-1.78374E-14	-6.35433E-14	1.03686E-10	-3.86130E-10	3.66319E-10	3.97064E-12	-2.44878E-5
M	-7.33596E-16	-7.14794E-16	9.78897E-13	-4.04386E-12	3.97064E-12	1.19251E-13	-5.64209E-7
A₂	3.44155E-9	3.41645E-9	-6.34683E-6	2.50006E-5	-2.44878E-5	-5.64209E-7	3.34441E0

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

2.736

Unit

Source

[2]

[3]

Quality

Value

3,B,R

Unit

Source

[2]

[3]

Amplitude

Value

0.08

Unit

mag

Source

[3]

[2]

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

[1]

Absolute Magnitude (H)
Slope Parameter (G)

H / G

Value

Unit

Source

Absolute Magnitude (H)

Value

19.158

Unit

mag

Source

[4]

Slope Parameter (G)

Value

0.15**

Unit

mag

Source

[4]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

0.05 - 0.25

Unit

Source

[5]

Diameter

Value

400 - 900*

Unit

Source

[5]

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

Radar R

Unit

Source

[1]

[6]

Satellites

Satellites

Value

Unit

Source

Satellites

Value

Binary Child 1

Unit

Source

[7]

Download this part as:

Sources

No.	Name	Additional
[1]	EARN	1.) Perna, D. et al. (2016) Astron. J. 151, 11(14p). (GRASPING THE NATURE OF POTENTIALLY HAZARDOUS ASTEROIDS) (spectra of 14 PHAs)
[2]	EARN	1.) Warner, B.D. (2013) MPB 40, 71-80. (ASTEROID LIGHTCURVE ANALYSIS AT THE PALMER DIVIDE OBSERVATORY: 2012 SEPTEMBER - 2013 JANUARY) (..,330825,2012TC4) 2.) Benner, L. et al. (2005) I.A.U. Circ. HREF="http://www.cbat.eps.harvard.edu/iauc/08500/08563.html"> 8563. (1994 XD) (Radar observations, binary detection)
[3]	EARN	1.) Warner, B.D. (2013) Minor Planet Bul. 40, 94-98.
[4]	ESA Aegis	ESA orbit determination and impact monitoring system
[5]	Estimation	Estimated from absolute magnitude
[6]	EARN	1.) href="http://echo.jpl.nasa.gov/asteroids/index.html">JPL's NEO Radar Detection Program Webpage 2.) Benner, L. et al. (2005) I.A.U. Circ. HREF="http://www.cbat.eps.harvard.edu/iauc/08500/08563.html"> 8563. (1994 XD) (Radar observations, binary detection)
[7]	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

10641

Unit

Source

[1]

Unobserved

Value

616

Unit

Source

[1]

Normalized RMS of residuals

Value

0.530516

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

1994-12-01.43811

Unit

Source

[2]

Last Observation

Value

2024-01-19.603681

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

653 (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

2005-06-24

Unit

Source

[3]

Last Observation

Value

2023-06-14

Unit

Source

[3]

Delay (Discarded)

Value

11 (0)

Unit

Source

[1]

Doppler (Discarded)

Value

5 (0)

Unit

Source

[1]

Total Radar Observations (Discarded)

Value

16 (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

Close Approaches for 488453 1994XD 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
MARS	1998-08-13 06:19	< 1 s	0.0487841	0.0487839	0.0000001
EARTH	2005-06-17 04:45	< 1 s	0.0732739	0.0732738	0.0000000
EARTH	2012-11-27 12:19	< 1 s	0.0518389	0.0518389	0.0000000
EARTH	2023-06-12 00:52	< 1 s	0.0211423	0.0211423	0.0000000
EARTH	2041-06-13 06:24	< 1 min	0.0153404	0.0153403	0.0000000
VENUS	2045-02-16 02:01	< 1 min	0.0487692	0.0487655	0.0000013
EARTH	2048-11-21 20:43	< 1 min	0.1209921	0.1209862	0.0000020
EARTH	2059-06-06 13:43	< 1 min	0.1077035	0.1076940	0.0000032
VENUS	2113-07-24 13:44	< 1 min	0.0201183	0.0201127	0.0000019

Download as:

Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
320.71982607	158.39768264	0.01998400	MINIMUM
38.01736840	326.53877001	0.03487765	MINIMUM
359.03531308	242.14658912	0.38703995	SADDLE
358.85254333	61.65285574	1.61572618	SADDLE
179.84376850	63.00872615	3.07426357	SADDLE
179.78865366	242.98406728	5.06869090	MAXIMUM

Download:

MOID Plots

Click on the images to zoom-in and zoom-out