Asteroids

33342 1998WT24 help

Last update: 2026-06-04 23:11 UTC

Orbital Properties

Epoch

61200.0

MJD

Orbit type

Aten

Perihelion (q)

0.419

Aphelion (Q)

1.019

Eccentricity (e)

0.418

Inclination (i)

7.4

deg

Orbit period (P)

222.5

Earth MOID

0.01033

U parameter

0.7

A₂

-22.6

10^-15au/days²

Next Earth close approach

Date

2026-12-24

Nominal distance (from Earth center)

0.10123

15143241

Maximum Brightness

17.2

mag

Risk

Object is not in risk list

Physical Properties

Absolute Magnitude (H)

mag

Diameter

415

Taxonomic type

Rotation period (T)

3.698

Discovery Information

Discovery Date

1998-11-25

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

61200.0000

1-sigma variation

Unit

MJD

Semimajor Axis

Value

0.718698

1-sigma variation

3.348E-9

Unit

Eccentricity (e)

Value

0.417632

1-sigma variation

1.196E-8

Unit

Inclination (i)

Value

7.3684

1-sigma variation

2.289E-6

Unit

Long. of Ascending Node (Ω)

Value

81.6576

1-sigma variation

1.996E-6

Unit

Arg. of Perihelion (ω)

Value

167.5121

1-sigma variation

2.982E-6

Unit

Mean Anomaly (M)

Value

278.10604

1-sigma variation

0.00004

Unit

Perihelion distance

Value

0.418547

1-sigma variation

Unit

Aphelion distance

Value

1.018850

1-sigma variation

Unit

Asc. Node-Earth Sep.

Value

0.017160

1-sigma variation

Unit

Desc. Node-Earth Sep.

Value

-0.594033

1-sigma variation

Unit

MOID

Value

0.010334

1-sigma variation

Unit

Orbit Period

Value

222.5452

1-sigma variation

Unit

U parameter

Value

0.7

1-sigma variation

Unit

A₂

Value

-22.63267

1-sigma variation

3.16264

Unit

10^-15au/days²

Covariance Matrix

	a	e	i	Ω	ω	M	A₂
a	1.12119E-17	-2.44883E-17	3.12369E-15	-1.91334E-15	9.57931E-15	-1.24148E-13	1.05863E-8
e	-2.44883E-17	1.42984E-16	-2.52734E-14	-1.25282E-14	-2.48822E-14	3.17927E-13	-2.23538E-8
i	3.12369E-15	-2.52734E-14	5.23743E-12	2.45705E-12	3.86619E-12	-4.40217E-11	2.78332E-6
Ω	-1.91334E-15	-1.25282E-14	2.45705E-12	3.98560E-12	-1.41112E-12	1.23479E-11	-1.94300E-6
ω	9.57931E-15	-2.48822E-14	3.86619E-12	-1.41112E-12	8.89494E-12	-1.08125E-10	9.00476E-6
M	-1.24148E-13	3.17927E-13	-4.40217E-11	1.23479E-11	-1.08125E-10	1.39931E-9	-1.16822E-4
A₂	1.05863E-8	-2.23538E-8	2.78332E-6	-1.94300E-6	9.00476E-6	-1.16822E-4	1.00023E1

Date of computation: 2026-06-04 23:11 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

3.698

Unit

Source

[5]

Quality

Value

Unit

Source

[5]

Amplitude

Value

0.25-0.56

Unit

mag

Source

[5]

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]

[2]

Taxonomy (all)

Value

E,Xe

Unit

Source

[3]

[4]

Absolute Magnitude (H)
Slope Parameter (G)

H / G

Value

Unit

Source

Absolute Magnitude (H)

Value

17.97

Unit

mag

Source

[6]

Slope Parameter (G)

Value

0.15**

Unit

Source

[6]

Albedo
Diameter

Size and albedo

Value

Unit

Source

Albedo

Value

0.75

Unit

Source

[8]

Diameter

Value

415

Unit

Source

[7]

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

Visual S

Unit

Source

[9]

[10]

Download this part as:

Sources

No.	Name	Additional
[1]	EARN	1.) Michaël Marsset et al 2022 AJ 163 165
[2]	EARN	1.) Lazzarin, M., Marchi,S. & Magrin, S. (2010) href="http://www.astro.unipd.it/planets/sineo/data.html"> SINEO Database (Spectroscopic Investiation of Near-Earth Objects)
[3]	EARN	Earth Asteroids Research Node: https://earn.dlr.de
[4]	EARN	1.) Harris, A.W.(DLR) et al. (2007) Icarus 188, 414-424. (Physical characterization of potentially-hazardous high-albedo asteroid (33342) 1998 WT24 from thermal-infrared observations) 2.) Kiselev, N.N. et al. (2002) Proceedings of ACM2002, ESA-SP500, pp. 887-890. (Polarimetry of Near-Earth asteroid 33342 1998 WT24) (albedo and diameter, Taxonomy) 3.) Lazzarin, M. et al. (2004) Icarus 169, 373-384. (Visible and near-infrared spectroscopic investigation of near-Earth objects at ESO: first results) 4.) Lazzarin, M., Marchi,S. & Magrin, S. (2010) href="http://www.astro.unipd.it/planets/sineo/data.html"> SINEO Database (Spectroscopic Investiation of Near-Earth Objects)
[5]	EARN	1.) Petr Pravec's Ondrejov NEO Photometric Program Webpage "Prepublished Periods" 2.) Krugly, Yu. N. et al. (2002) Proceedings of ACM2002, ESA-SP500, pp. 903-906. (CCD photometry of Near-Earth asteroids in 2001) (rot.per. for 719,1916,26760,33342 2001 MF1; LCs for 1620,3103,5587,1999 KW4) 3.) Vilagi, J. (2002) Proceedings of ACM2002, ESA-SP500, pp. 907-910. (Asteroid photometry program at Modra observatory) (LC for 1998 TU3, 33342 1998 WT24) 4.) Warner, B.D. (2016) MPB 43, 143-154. (NEAR-EARTH ASTEROID LIGHTCURVE ANALYSIS AT CS3-PALMER DIVIDE STATION: 2015 OCTOBER-DECEMBER)(36NEAs)
[6]	ESA Aegis	ESA orbit determination and impact monitoring system
[7]	EARN	1.) Busch, M.W. et al. (2008) Icarus 195, 614-621. (Physical properties of near-Earth Asteroid (33342) 1998 WT24) 2.) Harris, A.W.(DLR) et al. (2007) Icarus 188, 414-424. (Physical characterization of potentially-hazardous high-albedo asteroid (33342) 1998 WT24 from thermal-infrared observations) 3.) Kiselev, N.N. et al. (2002) Proceedings of ACM2002, ESA-SP500, pp. 887-890. (Polarimetry of Near-Earth asteroid 33342 1998 WT24) (albedo and diameter, Taxonomy) 4.) Zaitsev, A.L. et al. (2002) Proceedings of ACM2002, ESA-SP500, pp. 883-886. (Radar detection of NEA 33342 1998 WT24 with Evpatoria-Medicina system at 6 cm) (radar albedo and diameter)
[8]	EARN	1.) Thomas, C.A. et al. (2011) Astron. J. 142, 85. (ExploreNEOs. V. AVERAGE ALBEDO BY TAXONOMIC COMPLEX IN THE NEAR-EARTH ASTEROID POPULATION) (new albedos data for 118 NEOs) 2.) Harris, A.W.(DLR) et al. (2007) Icarus 188, 414-424. (Physical characterization of potentially-hazardous high-albedo asteroid (33342) 1998 WT24 from thermal-infrared observations) 3.) Kiselev, N.N. et al. (2002) Proceedings of ACM2002, ESA-SP500, pp. 887-890. (Polarimetry of Near-Earth asteroid 33342 1998 WT24) (albedo and diameter, Taxonomy)
[9]	EARN	1.) href="http://echo.jpl.nasa.gov/asteroids/index.html">JPL's NEO Radar Detection Program Webpage 2.) Zaitsev, A.L. et al. (2002) Proceedings of ACM2002, ESA-SP500, pp. 883-886. (Radar detection of NEA 33342 1998 WT24 with Evpatoria-Medicina system at 6 cm) (radar albedo and diameter)
[10]	EARN	1.) Lazzarin, M. et al. (2004) Icarus 169, 373-384. (Visible and near-infrared spectroscopic investigation of near-Earth objects at ESO: first results) 2.) Lazzarin, M., Marchi,S. & Magrin, S. (2010) href="http://www.astro.unipd.it/planets/sineo/data.html"> SINEO Database (Spectroscopic Investiation of Near-Earth Objects)

Observational Information

Arc Length
Unobserved
Normalized RMS of residuals

Arc Information

Value

Unit

Source

Arc Length

Value

9571

Unit

Source

[1]

Unobserved

Value

486

Unit

Source

[1]

Normalized RMS of residuals

Value

0.483116

Unit

Source

[1]

Astrometry Summary

First Observation
Last Observation
Total Optical Observations (Discarded)

Optical

Value

Unit

Source

First Observation

Value

1998-11-24.48806

Unit

Source

[2]

Last Observation

Value

2025-02-06.55552

Unit

Source

[2]

Total Optical Observations (Discarded)

Value

1929 (30)

Unit

Source

[1]

Radar Summary

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

Radar

Value

Unit

Source

First Observation

Value

2001-12-14

Unit

Source

[3]

Last Observation

Value

2015-12-18

Unit

Source

[3]

Delay (Discarded)

Value

16 (0)

Unit

Source

[1]

Doppler (Discarded)

Value

1 (0)

Unit

Source

[1]

Total Radar Observations (Discarded)

Value

17 (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

Note: Ephemerides requests are limited to a maximum of 1000 points and a final date not exceeding 2040/12/31 00:00.

Close Approaches for 33342 1998WT24 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	1953-12-23 10:13	< 1 min	0.1824542	0.1824419	0.0000041
EARTH	1956-12-16 23:15	< 1 min	0.0090528	0.0090522	0.0000002
EARTH	1959-11-15 04:58	< 1 min	0.0754244	0.0754230	0.0000005
MERCURY	1960-03-22 02:52	< 1 min	0.0321515	0.0321497	0.0000006
MERCURY	1962-09-15 05:27	< 1 min	0.0217011	0.0217009	0.0000001
EARTH	1970-12-23 07:22	< 1 min	0.0582393	0.0582372	0.0000007
MERCURY	1972-12-30 11:24	< 1 min	0.0389235	0.0389218	0.0000006
EARTH	1973-11-24 21:05	< 1 min	0.0513096	0.0513093	0.0000001
MERCURY	1975-06-23 14:27	< 1 min	0.0350584	0.0350560	0.0000008
EARTH	1976-11-11 01:48	< 1 s	0.1809147	0.1809132	0.0000005
VENUS	1977-02-26 19:48	< 1 min	0.0380680	0.0380674	0.0000002
EARTH	1984-12-23 16:41	< 1 s	0.1513762	0.1513750	0.0000004
MERCURY	1985-10-08 17:05	< 1 min	0.0484699	0.0484690	0.0000003
MERCURY	1987-01-07 01:24	< 1 min	0.0433265	0.0433254	0.0000004
EARTH	1987-12-11 21:35	< 1 min	0.0266831	0.0266826	0.0000002
EARTH	1990-11-12 05:58	< 1 s	0.1074798	0.1074792	0.0000002
MERCURY	1997-04-28 03:52	< 1 min	0.0374412	0.0374410	0.0000001
MERCURY	1998-07-29 02:49	< 1 min	0.0475327	0.0475325	0.0000001
EARTH	2001-12-16 05:39	< 1 s	0.0124855	0.0124855	0.0000000
EARTH	2004-11-12 00:53	< 1 s	0.0973304	0.0973303	0.0000000
MERCURY	2007-08-31 15:03	< 1 s	0.0489865	0.0489864	0.0000000
MERCURY	2010-02-25 11:47	< 1 s	0.0218067	0.0218066	0.0000000
EARTH	2012-12-23 07:33	< 1 s	0.1778631	0.1778630	0.0000000
EARTH	2015-12-11 13:15	< 1 s	0.0279949	0.0279949	0.0000000
EARTH	2018-11-11 10:15	< 1 s	0.1345226	0.1345224	0.0000001
MERCURY	2020-07-05 02:19	< 1 min	0.0215610	0.0215609	0.0000000
EARTH	2026-12-24 07:39	< 1 s	0.1012263	0.1012254	0.0000003
MERCURY	2028-05-18 06:07	< 1 min	0.0447000	0.0446985	0.0000005
EARTH	2029-11-26 03:32	< 1 min	0.0495659	0.0495656	0.0000001
MERCURY	2030-11-13 09:04	< 1 min	0.0245476	0.0245464	0.0000004
VENUS	2035-08-08 09:00	< 1 min	0.0401904	0.0401894	0.0000003
VENUS	2036-03-19 04:45	< 1 min	0.0448869	0.0448854	0.0000005
MERCURY	2038-09-28 06:36	< 1 min	0.0286668	0.0286666	0.0000000
EARTH	2040-12-20 14:55	< 1 min	0.0273617	0.0273595	0.0000007
EARTH	2043-11-16 17:14	< 1 min	0.0656030	0.0656020	0.0000003
MERCURY	2051-07-30 19:36	< 1 min	0.0205499	0.0205499	0.0000000
EARTH	2054-12-19 07:12	< 1 min	0.0143619	0.0143613	0.0000002
EARTH	2057-11-15 02:59	< 1 min	0.0701692	0.0701683	0.0000003
MERCURY	2060-08-27 22:43	< 1 min	0.0281260	0.0281253	0.0000002
MERCURY	2063-02-21 17:17	< 1 min	0.0270220	0.0270185	0.0000012
EARTH	2068-12-22 02:59	< 1 min	0.0426424	0.0426381	0.0000014
EARTH	2071-11-22 00:38	< 1 min	0.0521641	0.0521632	0.0000003
MERCURY	2072-03-18 04:40	< 1 min	0.0496621	0.0496549	0.0000024
MERCURY	2074-09-09 00:14	< 1 min	0.0378772	0.0378726	0.0000015
EARTH	2074-11-12 05:50	< 1 min	0.1967167	0.1967121	0.0000015
EARTH	2082-12-24 15:34	< 1 s	0.1241139	0.1241091	0.0000016
MERCURY	2084-12-24 07:04	< 1 min	0.0296402	0.0296374	0.0000009
EARTH	2085-12-06 23:45	< 1 min	0.0349821	0.0349807	0.0000005
MERCURY	2087-06-18 09:27	< 1 min	0.0223005	0.0222978	0.0000009
EARTH	2088-11-11 12:15	< 1 min	0.1203155	0.1203123	0.0000011
VENUS	2090-12-20 14:46	< 1 min	0.0482834	0.0482803	0.0000010
VENUS	2091-08-01 08:07	< 1 min	0.0418781	0.0418759	0.0000007
EARTH	2096-12-23 02:40	< 1 min	0.1999399	0.1999369	0.0000010
MERCURY	2097-10-05 03:19	< 1 min	0.0434568	0.0434545	0.0000007
MERCURY	2099-01-03 23:06	< 1 min	0.0448039	0.0448019	0.0000006
EARTH	2099-12-18 00:26	< 1 min	0.0126400	0.0126400	0.0000000
MERCURY	2100-03-28 12:54	< 1 min	0.0497974	0.0497936	0.0000012
EARTH	2102-11-15 22:44	< 1 min	0.0715257	0.0715229	0.0000010
MERCURY	2109-04-23 17:44	< 1 min	0.0272106	0.0272081	0.0000008
MERCURY	2111-10-18 07:07	< 1 min	0.0246844	0.0246701	0.0000048
EARTH	2113-12-23 11:32	< 1 min	0.0435054	0.0434902	0.0000051
EARTH	2116-11-21 23:32	1.3	0.0508810	0.0508775	0.0000012
EARTH	2119-11-13 14:59	< 1 min	0.1993472	0.1993277	0.0000065
MERCURY	2122-02-01 14:42	2.3	0.0419016	0.0418844	0.0000057
MERCURY	2123-05-03 01:21	2.6	0.0475022	0.0474869	0.0000051
MERCURY	2124-07-25 04:48	< 1 min	0.0451694	0.0451374	0.0000107

Download as:

Stationary Points

Ecc. an. ast.	Ecc. an. Earth	Distance in au	Classification
205.36632188	344.52026271	0.01046509	MINIMUM
2.04765360	149.94054842	0.59731827	SADDLE
2.27320896	330.33934671	1.40440555	SADDLE
181.29149957	149.30171904	2.03428465	MAXIMUM

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MOID Plots

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