Asteroids

6489 Golevka help

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

Orbital Properties

Epoch

61000.0

MJD

Orbit type

Apollo

Perihelion (q)

0.944

Aphelion (Q)

4.009

Eccentricity (e)

0.619

Inclination (i)

2.3

deg

Orbit period (P)

1423.7

Earth MOID

0.02245

U parameter

0.0

A₂

-12.1

10^-15au/days²

Next Earth close approach

Date

2046-05-14

Nominal distance (from Earth center)

0.0508

7600020

Maximum Brightness

14.8

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

mag

Diameter

350 | 250 | 250

Taxonomic type

Rotation period (T)

6.026

Discovery Information

Discovery Date

1991-05-10

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

2.476776

1-sigma variation

2.439E-9

Unit

Eccentricity (e)

Value

0.618757

1-sigma variation

3.044E-9

Unit

Inclination (i)

Value

2.2593

1-sigma variation

8.228E-7

Unit

Long. of Ascending Node (Ω)

Value

208.7136

1-sigma variation

3.012E-5

Unit

Arg. of Perihelion (ω)

Value

69.5333

1-sigma variation

3.138E-5

Unit

Mean Anomaly (M)

Value

252.42077

1-sigma variation

1.913E-6

Unit

Perihelion distance

Value

0.944253

1-sigma variation

Unit

Aphelion distance

Value

4.009298

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.250361

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

0.956351

1-sigma variation

Unit

MOID

Value

0.022454

1-sigma variation

Unit

Orbit Period

Value

1423.7326

1-sigma variation

Unit

U parameter

Value

0.0

1-sigma variation

Unit

A₂

Value

-12.05023

1-sigma variation

1.65336

Unit

10^-15au/days²

Covariance Matrix

	a	e	i	Ω	ω	M	A₂
a	5.94935E-18	6.02120E-18	-1.47233E-15	-5.36709E-14	5.70515E-14	-4.66687E-15	3.97750E-9
e	6.02120E-18	9.26762E-18	-2.30833E-15	-8.64748E-14	9.08697E-14	-4.68728E-15	3.79612E-9
i	-1.47233E-15	-2.30833E-15	6.76993E-13	2.47154E-11	-2.57140E-11	1.14704E-12	-9.97588E-7
Ω	-5.36709E-14	-8.64748E-14	2.47154E-11	9.07315E-10	-9.44954E-10	4.17829E-11	-3.57716E-5
ω	5.70515E-14	9.08697E-14	-2.57140E-11	-9.44954E-10	9.84902E-10	-4.44234E-11	3.78895E-5
M	-4.66687E-15	-4.68728E-15	1.14704E-12	4.17829E-11	-4.44234E-11	3.66137E-12	-3.12297E-6
A₂	3.97750E-9	3.79612E-9	-9.97588E-7	-3.57716E-5	3.78895E-5	-3.12297E-6	2.73361E0

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

6.026

Unit

Source

[4]

Quality

Value

Unit

Source

[4]

Amplitude

Value

0.28-1.05

Unit

mag

Source

[4]

Rotation Direction

Value

Unit

Source

[-]

Spinvector L

Value

208

Unit

Source

[1]

Spinvector B

Value

-47

Unit

Source

[1]

Taxonomy
Taxonomy (all)

Taxonomy

Value

Unit

Source

Taxonomy

Value

Unit

Source

[2]

Taxonomy (all)

Value

Q;V;Sq

Unit

Source

[3]

Absolute Magnitude (H)
Slope Parameter (G)

H / G

Value

Unit

Source

Absolute Magnitude (H)

Value

19.074

18.974

Unit

mag

Source

[5]

[6]

Slope Parameter (G)

Value

0.138

0.15**

Unit

mag

Source

[5]

[6]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

0.15

0.6

Unit

Source

[8]

[9]

Diameter

Value

350 | 250 | 250

Unit

Source

[7]

Color Index Information

Color Index Information

Value

Unit

Source

Color Index Information

Value

0.45

Unit

V-R

Source

[9]

Sightings

Sightings

Value

Unit

Source

Sightings

Value

Visual S

Radar R

Unit

Source

[10]

[11]

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Sources

No.	Name	Additional
[1]	EARN	1.) Kaasalainen, M. et al. (2001) Icarus 153, 37-51. (Optimization Methods for Asteroid Lightcurve Inversion) 2.) Hudson, R.S. et al. (2000) Icarus 148, 37-51. (Radar observations and physical model of asteroid 6489 Golevka.) 3.) Mottola, S. et al. (1997) Astron. J. 114, 1234-1245. (Physical model of near-earth asteroid 6489 Golevka (1991 JX) from optical and infrared observations)
[2]	EARN	1.) 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]	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.) Mottola, S. et al. (1995) B.A.A.S. 27, 1055. (Physical Model of Near-Earth Asteroid (6489) 1991 JX from Optical and Infrared Observations) 4.) Hicks, M.D. & W. Grundy (1995) I.A.U. Circ. HREF="http://www.cbat.eps.harvard.edu/iauc/06100/06177.html"> 6177. (1991 JX - Spectra) 5.) Harris, A.W. (DLR) et al. (1995) I.A.U. Circ. 6181. (1991 JX - IR obs) 6.) Davies, J.K. et al. (2007) Icarus 186,111-125. (Near-infrared spectra of 12 near-Earth objects) (1627,4179, 5381,5587,6489,11405,14402,25143,25330,52760,66391,101955)
[4]	EARN	1.) Mottola, S. et al. (1997) Astron. J. 114, 1234-1245. (Physical model of near-earth asteroid 6489 Golevka (1991 JX) from optical and infrared observations) 2.) Harris, A.W. (DLR) (1998) Icarus 131, 291-301. (A Thermal Model for Near-Earth Asteroids) 3.) Hudson, R.S. et al. (2000) Icarus 148, 37-51. (Radar observations and physical model of asteroid 6489 Golevka.) 4.) Kaasalainen, M. et al. (2001) Icarus 153, 37-51. (Optimization Methods for Asteroid Lightcurve Inversion)
[5]	EARN	1.) Mottola, S. et al. (1997) Astron. J. 114, 1234-1245. (Physical model of near-earth asteroid 6489 Golevka (1991 JX) from optical and infrared observations) 2.) Mottola, S. et al. (1985) B.A.A.S. 27, 1055. (Physical model of near-Earth asteroid (6489) 1981 JX, from optical and infrared observations)
[6]	ESA Aegis	ESA orbit determination and impact monitoring system
[7]	EARN	1.) Mottola, S. et al. (1997) Astron. J. 114, 1234-1245. (Physical model of near-earth asteroid 6489 Golevka (1991 JX) from optical and infrared observations) 2.) Hudson, R.S. & S.J. Ostro (1995) B.A.A.S. 27, 1062. (Radar-Based Physical Models of Earth-Crossing Asteroids) 3.) Harris, A.W. (DLR) & J.S.V Lagerros (2002) in "Asteroids III" (Eds. W.F.Bottke et al.), Univ.Ariz.Press, Tucson, USA, pp. 205-218. (Asteroids in the thermal infrared) 4.) Hudson, R.S. et al. (2000) Icarus 148, 37-51. (Radar observations and physical model of asteroid 6489 Golevka.)
[8]	EARN	1.) Harris, A.W. (DLR) & J.S.V Lagerros (2002) in "Asteroids III" (Eds. W.F.Bottke et al.), Univ.Ariz.Press, Tucson, USA, pp. 205-218. (Asteroids in the thermal infrared) 2.) Hudson, R.S. et al. (2000) Icarus 148, 37-51. (Radar observations and physical model of asteroid 6489 Golevka.)
[9]	EARN	1.) Mottola, S. et al. (1997) Astron. J. 114, 1234-1245. (Physical model of near-earth asteroid 6489 Golevka (1991 JX) from optical and infrared observations)
[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.) Davies, J.K. et al. (2007) Icarus 186,111-125. (Near-infrared spectra of 12 near-Earth objects) (1627,4179, 5381,5587,6489,11405,14402,25143,25330,52760,66391,101955) 4.) Hicks, M.D. et al. (1998) Icarus 133, 69-78. (The Unusual Spectra of 15 Near-Earth Asteroids and Extinct Comet Candidates)(1566,1620,2063,2102,2201,3200,4953,6053,6489, 7092,8176,1994ES1,1995CR,1996JA1) 5.) Fevig. R.A. and U. Fink (2007) Icarus 188, 175-188. (Spectral observations of 19 weathered and 23 fresh NEAs and their correlations with orbital parameters)(433,1036, 1627,1685,1862,1866,1943,1980,3103,3122,3199,3671,4183,4341, 4954,5587,5751,5836,6037,7358,7482,7753,7822,7977,8201, 10563,11066,13651,13651,19356,20236,20255,35107,85490, J97GD32,J97UH9,J97US9,J98HE3,J98HT31,J98ME3,J98MS2,K04LC2)
[11]	EARN	1.) Zaitsev, A.L. (1997) Planet. Space Sci. 45, 771-778. (Intercontinental bistatic radar observations of 6489 Golevka (1991 JX)) 2.) Hudson, R.S. et al. (2000) Icarus 148, 37-51. (Radar observations and physical model of asteroid 6489 Golevka.) 3.) Koyama, Y., et al., (2001) Journal of the Communications Research Laboratory [Japan] 48, 143-150. (Radar observations of near Earth asteroids 6489 Golevka and 4197 (1982 TA).) 4.) Chesley, S.R. et al. (2003) Science 302, 1739-1742. (Direct Detection of the Yarkovsky Effect via Radar Ranging to Asteroid 6489 Golevka.)

Observational Information

Arc Length
Unobserved
Normalized RMS of residuals

Arc Information

Value

Unit

Source

Arc Length

Value

8968

Unit

Source

[1]

Unobserved

Value

3603

Unit

Source

[1]

Normalized RMS of residuals

Value

0.645666

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

1991-04-15.34878

Unit

Source

[2]

Last Observation

Value

2015-11-03.35213

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

980 (5)

Unit

Source

[1]

Radar Summary

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

Radar

Value

Unit

Source

First Observation

Value

1991-06-05

Unit

Source

[3]

Last Observation

Value

2003-05-27

Unit

Source

[3]

Delay (Discarded)

Value

20 (0)

Unit

Source

[1]

Doppler (Discarded)

Value

20 (0)

Unit

Source

[1]

Total Radar Observations (Discarded)

Value

40 (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 6489 Golevka 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	1987-05-19 03:28	< 1 s	0.1979190	0.1979189	0.0000000
EARTH	1991-06-11 19:16	< 1 s	0.0331846	0.0331846	0.0000000
EARTH	1995-06-09 02:15	< 1 s	0.0341059	0.0341059	0.0000000
EARTH	1999-06-02 19:26	< 1 s	0.0500515	0.0500515	0.0000000
EARTH	2003-05-20 16:07	< 1 s	0.0922646	0.0922646	0.0000000
EARTH	2046-05-14 05:25	< 1 min	0.0508030	0.0508021	0.0000003
EARTH	2069-07-19 23:26	< 1 min	0.1011491	0.1011484	0.0000002
EARTH	2092-06-19 10:31	< 1 min	0.1107591	0.1107585	0.0000002
EARTH	2115-08-19 08:39	< 1 min	0.0564226	0.0564221	0.0000002

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Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
343.07001078	141.26539131	0.02305456	MINIMUM
16.83588259	210.20912371	0.03896630	MINIMUM
0.61865260	177.09693969	0.07624001	SADDLE
0.10492232	356.02387549	1.93256826	SADDLE
180.03317951	355.90791188	3.02869353	SADDLE
180.01394453	175.89913012	5.02721455	MAXIMUM

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MOID Plots

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