Asteroids

164211 2004JA27 help

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

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Apollo

Perihelion (q)

0.961

Aphelion (Q)

2.372

Eccentricity (e)

0.423

Inclination (i)

2.3

deg

Orbit period (P)

785.7

Earth MOID

0.03258

U parameter

0.0

Next Earth close approach

Date

2032-07-11

Nominal distance (from Earth center)

0.09724

14547110

Maximum Brightness

16.9

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

19.5

mag

Diameter

300

Taxonomic type

Sq/Q

Rotation period (T)

Discovery Information

Discovery Date

2004-05-15

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

1.666310

1-sigma variation

1.364E-9

Unit

Eccentricity (e)

Value

0.423289

1-sigma variation

1.863E-8

Unit

Inclination (i)

Value

2.2579

1-sigma variation

4.090E-6

Unit

Long. of Ascending Node (Ω)

Value

67.7600

1-sigma variation

0.0001

Unit

Arg. of Perihelion (ω)

Value

270.1979

1-sigma variation

0.0001

Unit

Mean Anomaly (M)

Value

312.23705

1-sigma variation

4.125E-6

Unit

Perihelion distance

Value

0.960979

1-sigma variation

Unit

Aphelion distance

Value

2.371640

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.378620

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.355372

1-sigma variation

Unit

MOID

Value

0.032576

1-sigma variation

Unit

Orbit Period

Value

785.6552

1-sigma variation

Unit

U parameter

Value

0.0

1-sigma variation

Unit

Covariance Matrix

	a	e	i	Ω	ω	M
a	1.86102E-18	-7.03763E-19	2.18349E-15	4.19258E-15	-7.00329E-15	-2.19689E-15
e	-7.03763E-19	3.47065E-16	1.63362E-15	-2.76991E-14	1.39009E-14	-1.84719E-15
i	2.18349E-15	1.63362E-15	1.67305E-11	-1.58427E-10	1.51472E-10	9.20587E-13
Ω	4.19258E-15	-2.76991E-14	-1.58427E-10	5.63441E-9	-5.64147E-9	5.32485E-13
ω	-7.00329E-15	1.39009E-14	1.51472E-10	-5.64147E-9	5.69085E-9	-1.70750E-11
M	-2.19689E-15	-1.84719E-15	9.20587E-13	5.32485E-13	-1.70750E-11	1.70160E-11

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

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

Sq/Q

Unit

Source

[1]

Taxonomy (all)

Value

Sq/Q,Sco

Unit

Source

[2]

Absolute Magnitude (H)
Slope Parameter (G)

H / G

Value

Unit

Source

Absolute Magnitude (H)

Value

19.467

Unit

mag

Source

[3]

Slope Parameter (G)

Value

0.15**

Unit

mag

Source

[3]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

0.342

Unit

Source

[4]

Diameter

Value

300

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

Visual S

Radar R

Unit

Source

[5]

[6]

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.) Perna, D. et al. (2016) Astron. J. 151, 11(14p). (GRASPING THE NATURE OF POTENTIALLY HAZARDOUS ASTEROIDS) (spectra of 14 PHAs) 2.) 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)
[3]	ESA Aegis	ESA orbit determination and impact monitoring system
[4]	EARN	1.) Joseph R. Masiero et al 2021 Planet. Sci. J. 2 162
[5]	EARN	1.) Binzel, R.P. et al. (2006) LPSC 37, 1491. (The MIT-Hawaii-IRTF joint campaign for NEO spectral reconnaissance.) 2.) Binzel, R.P. et al. href="http://smass.mit.edu/minus.html"> Webpage 3.) Perna, D. et al. (2016) Astron. J. 151, 11(14p). (GRASPING THE NATURE OF POTENTIALLY HAZARDOUS ASTEROIDS) (spectra of 14 PHAs)
[6]	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

7595

Unit

Source

[1]

Unobserved

Value

235

Unit

Source

[1]

Normalized RMS of residuals

Value

0.590783

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

2004-05-15.30124

Unit

Source

[2]

Last Observation

Value

2025-03-01.412326

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

486 (6)

Unit

Source

[1]

Radar Summary

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

Radar

Value

Unit

Source

First Observation

Value

2004-10-05

Unit

Source

[3]

Last Observation

Value

2004-10-05

Unit

Source

[3]

Delay (Discarded)

Value

0 (0)

Unit

Source

[-]

Doppler (Discarded)

Value

1 (0)

Unit

Source

[1]

Total Radar Observations (Discarded)

Value

1 (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 164211 2004JA27 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	1961-08-23 19:17	< 1 min	0.0618650	0.0618648	0.0000001
EARTH	1976-10-20 13:35	< 1 s	0.1625539	0.1625535	0.0000001
EARTH	1989-07-04 20:04	< 1 s	0.1682435	0.1682431	0.0000001
EARTH	2004-09-10 10:44	< 1 min	0.0578838	0.0578836	0.0000001
EARTH	2032-07-11 01:58	< 1 min	0.0972414	0.0972410	0.0000002
EARTH	2047-09-23 03:10	< 1 min	0.0451411	0.0451410	0.0000001
EARTH	2075-07-08 08:56	< 1 min	0.1385416	0.1385404	0.0000004
EARTH	2090-08-23 12:08	< 1 min	0.0611843	0.0611840	0.0000001
EARTH	2105-10-18 10:06	< 1 s	0.1043365	0.1043361	0.0000001

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
336.58618589	199.96586176	0.03275984	MINIMUM
20.15100122	267.88105163	0.03388851	MINIMUM
358.39714494	234.00783668	0.06208623	SADDLE
179.31587462	54.97548641	1.38220797	SADDLE
358.33479239	53.89351957	1.95095337	SADDLE
179.30150143	234.96032484	3.38010602	MAXIMUM

Download:

MOID Plots

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