Asteroids

1998KY26 help

Last update: 2024-04-19 23:53 UTC

Orbital Properties

Epoch

60400.0

MJD

Orbit type

Apollo

Perihelion (q)

0.984

Aphelion (Q)

1.482

Eccentricity (e)

0.202

Inclination (i)

1.5

deg

Orbit period (P)

500.0

Earth MOID

0.00254

U parameter

1.0

A₂

-235.6

10^-15au/days²

Next Earth close approach

Date

2024-06-01

Nominal distance (from Earth center)

0.03068

4589327

Maximum Brightness

20.5

mag

Risk

Object is not in risk list

Object is not in priority list

Physical Properties

Absolute Magnitude (H)

25.6

mag

Diameter

<=40.0

Taxonomic type

Rotation period (T)

0.1784

Discovery Information

Discovery Date

1998-05-28

Observatory

Steward Observatory, Kitt Peak-Spacewatch

Orbit Visualiser

Click the button to start Orbit Visualiser

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

60400.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

1.232850

1-sigma variation

2.695E-8

Unit

Eccentricity (e)

Value

0.201872

1-sigma variation

6.756E-8

Unit

Inclination (i)

Value

1.4810

1-sigma variation

3.570E-6

Unit

Long. of Ascending Node (Ω)

Value

84.3627

1-sigma variation

2.220E-5

Unit

Arg. of Perihelion (ω)

Value

209.3633

1-sigma variation

4.092E-5

Unit

Mean Anomaly (M)

Value

287.53973

1-sigma variation

0.00002

Unit

Perihelion distance

Value

0.983972

1-sigma variation

Unit

Aphelion distance

Value

1.481727

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.451174

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.009930

1-sigma variation

Unit

MOID

Value

0.002542

1-sigma variation

Unit

Orbit Period

Value

499.9927

1-sigma variation

Unit

U parameter

Value

1.0

1-sigma variation

Unit

A₂

Value

-235.58672

1-sigma variation

37.92410

Unit

10^-15au/days²

Covariance Matrix

	a	e	i	Ω	ω	M	A₂
a	7.26512E-16	-1.75294E-15	-2.78586E-14	1.35815E-14	-8.71648E-13	5.61350E-13	1.02209E-6
e	-1.75294E-15	4.56379E-15	6.91036E-14	-1.65404E-14	2.27999E-12	-1.50052E-12	-2.47565E-6
i	-2.78586E-14	6.91036E-14	1.27440E-11	-7.38233E-11	1.10316E-10	-2.44063E-11	-3.85786E-5
Ω	1.35815E-14	-1.65404E-14	-7.38233E-11	4.92799E-10	-5.19915E-10	2.01555E-11	1.45093E-5
ω	-8.71648E-13	2.27999E-12	1.10316E-10	-5.19915E-10	1.67428E-9	-7.69123E-10	-1.22704E-3
M	5.61350E-13	-1.50052E-12	-2.44063E-11	2.01555E-11	-7.69123E-10	5.10259E-10	7.93519E-4
A₂	1.02209E-6	-2.47565E-6	-3.85786E-5	1.45093E-5	-1.22704E-3	7.93519E-4	1.43824E3

Date of computation: 2024-04-18 11:58 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

0.1784

Unit

Source

[1]

Quality

Value

Unit

Source

[1]

Amplitude

Value

0.3

Unit

mag

Source

[1]

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

25.646

24.95

Unit

mag

Source

[2]

[3]

Slope Parameter (G)

Value

0.15**

Unit

mag

Source

[2]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

dark

Unit

Source

[4]

Diameter

Value

<=40.0

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

Radar R

Unit

Source

[6]

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Sources

No.	Name	Additional
[1]	EARN	1.) Pravec, P. & L Sarounova (1998) I.A.U. Circ. HREF="http://www.cbat.eps.harvard.edu/iauc/06900/06941.html"> 6941. (1998 KY26 - rotation period) 2.) Ostro, S. J. et al (1999) Science 285, 557-559. (Radar and Optical Observations of Asteroid 1998 KY26) 3.) Whiteley, R.J. et al. (2002) Proceedings of ACM2002, ESA-SP500, pp. 473-480. (Monolithic fast-rotating asteroids) (H-values and rotation properties of 36 NEAs) 4.) Hicks, M.D. et al. (1998) B.A.A.S. 30, 1029. (Close encounters: Observations of the Earth-crossing asteroids 1998 KY26 and 1998 ML14) 5.) Ostro, S.J. et al. (1998) I.A.U. Circ. HREF="http://www.cbat.eps.harvard.edu/iauc/06900/06935.html"> 6935. (1998 KY26 - radar period size) 6.) Hicks, M.D. et al. (1998) B.A.A.S. 30, 1029. (Close Encounters: Observations of the Earth-crossing Asteroids 1998 KY26 and 1998 ML14)
[2]	ESA ODIM	ESA orbit determination and impact monitoring system
[3]	EARN	1.) Hicks, M.D. & D.L. Rabinowitz (1998) I.A.U. Circ. HREF="http://www.cbat.eps.harvard.edu/iauc/06900/06945.html"> 6945. (1998 KY26 - BVRI photometry period ampl) 2.) Ostro, S. J. et al (1999) Science 285, 557-559. (Radar and Optical Observations of Asteroid 1998 KY26)
[4]	EARN	1.) Binzel, R.P. et al. (2002) in "Asteroids III" (Eds. W.F.Bottke et al.), Univ.Ariz.Press, Tucson, USA, pp. 255-271. (Physical Properties of NEOs) 2.) Hicks, M. et al. (1998) B.A.A.S. 30,1029. (Close Encounters: Observations of the Earth-crossing Asteroids 1998 KY26 and 1998 ML14)
[5]	EARN	1.) Ostro, S.J. et al. (1998) I.A.U. Circ. HREF="http://www.cbat.eps.harvard.edu/iauc/06900/06935.html"> 6935. (1998 KY26 - radar period size)
[6]	EARN	1.) Ostro, S.J. et al. (1998) I.A.U. Circ. HREF="http://www.cbat.eps.harvard.edu/iauc/06900/06935.html"> 6935. (1998 KY26 - radar period size) 2.) Ostro, S.J. et al. (1998) B.A.A.S 30, 1036. (Near-Earth-Asteroid Radar at Goldstone, Aug 1996 - Jun 1998) [7822(1991CS),4197(1982TA),4179Toutatis,7341(1991VK), 7482(1994PC1),1997BR,1998BY7,6037(1988EG),1998KY26] 3.) Ostro S.J. et al., (1999) Science 285, 557-559. (Radar and Optical Observations of Asteroid 1998 KY26.) 4.) Ostro, S. J. et al (1999) Science 285, 557-559. (Radar and Optical Observations of Asteroid 1998 KY26)

Observational Information

Arc Length
Unobserved
Normalized RMS of residuals

Arc Information

Value

Unit

Source

Arc Length

Value

9456

Unit

Source

[1]

Unobserved

Value

Unit

Source

[1]

Normalized RMS of residuals

Value

0.604597

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

1998-05-28.22782

Unit

Source

[2]

Last Observation

Value

2024-04-17.398566

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

239 (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

1998-06-06

Unit

Source

[3]

Last Observation

Value

1998-06-08

Unit

Source

[3]

Delay (Discarded)

Value

2 (0)

Unit

Source

[1]

Doppler (Discarded)

Value

2 (0)

Unit

Source

[1]

Total Radar Observations (Discarded)

Value

4 (0)

Unit

Source

[1]

Note: The ASCII file is in a format suitable for Orbfit input.

Sources

No.	Name	Additional
[1]	ESA ODIM	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 1998KY26 from 1950 to 2124

Body	Date in UTC	Time uncert. in min	Nominal distance in au	Min. possibile distance in au	Distance uncert. in au
EARTH	1959-06-07 10:11	> 1 d	0.0082389	0.0042637	0.0055054
EARTH	1984-08-19 14:22	73.3	0.0237368	0.0235282	0.0000705
EARTH	1991-07-08 23:54	> 1 d	0.0297623	0.0289553	0.0002734
EARTH	1998-06-08 05:45	9.9	0.0053888	0.0053327	0.0000187
EARTH	2013-09-06 04:04	< 1 min	0.1173171	0.1172947	0.0000075
EARTH	2024-06-01 16:03	16.6	0.0306778	0.0304905	0.0000624
EARTH	2039-05-24 10:02	66.4	0.1081592	0.1061856	0.0006579
EARTH	2058-09-05 02:16	23.2	0.0872114	0.0867102	0.0001671
EARTH	2073-08-30 20:15	148.6	0.0484153	0.0466074	0.0006066
EARTH	2099-06-04 03:02	542.7	0.0276806	0.0216626	0.0020075
EARTH	2118-08-27 05:35	> 1 w	0.0271786	0.0241791	0.0159402

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