Asteroids

This representation of the physical properties of interesting asteroids includes most of the asteroids larger than about 200 km in diameter. They are portrayed in their correct relative sizes and shapes (the limb of Mars is shown for comparison); colors and albedos are also indicated. The bodies are positioned at their correct relative distances from the Sun. Asteroids located near the top or bottom of the diagram occupy relatively eccentric or inclined orbits (or both), while those shown near the ecliptic plane move in relatively circular, noninclined orbits. Rotation periods, in hours, are given in the lower panel. Among the special smaller asteroids indicated are members of the Flora families larger than 15 km in diameter, but this illustration would be hopelessly cluttered if all asteroids of comparable size were shown - an estimated 1,150 asteroids in the main belt alone have diameters larger than 30 km, yet only five Flora family asteroids attain that size. Note the contact-binary Trojan asteroid 624 Hektor.

The following graph shows the number density of asteroids as a funciton of their distance from the sun. Note that there are peaks and throughs in this density due to exact periodic resonance with Jupiter. Also, the peak above 5 AU is due to the Trojan Asteroids. These asteroids are located approximately at the leading and trailing Lagrangian (i.e. Trojan) of Jupiter's Orbit.

The following drawing is a real plot of the exact planar positions of all inner solar system asteroids with well determined orbits at a specific date in 1997. Note the Trojan Asteroids.

Largest Asteroid Summary

Rotation

Mean

distance

Orbital

Orbital

Orbital

Year of

Radius

period

From

Sun

period

eccen-

Inclination

Number

Name

discovery

Discoverer

(km)

(hours)

Albedo

(AU)

(106km)

(years)

tricity

(degrees)

1

Ceres

1801

G.Piazzi

457

9.08

0.1

2.767

413.9

4.61

0.097

10.61

2

Pallas

1802

H.Olbers

261

7.81

0.14

2.771

414.5

4.61

0.18

34.81

4

Vesta

1807

H.Olbers

250

5.34

0.38

2.362

353.4

3.63

0.097

7.14

10

Hygiea

1849

A.De Gasparis

215

-18.4

0.08

3.144

470.3

5.59

0.136

3.84

511

Davida

1903

R.Dugan

168

5.13

0.05

3.178

475.4

5.67

0.171

15.94

704

Interamnia

1910

V.Ceruili

167

8.73

0.06

3.062

458.1

5.36

0.081

17.3

52

Europa

1858

H.Goldschmidt

156

5.63

0.06

3.097

463.3

5.46

0.119

7.44

15

Eunomia

1851

A.De Gasparis

136

6.08

0.19

2.644

395.5

4.3

0.143

11.76

87

Sylvia

1866

N.Pogson

136

5.18

0.04

3.486

521.5

6.52

0.051

10.87

16

Psyche

1852

A. De Gasparis

132

4.2

0.1

2.922

437.1

5

0.1

3.09

31

Euphrosyne

1854

J. Ferguson

-124

5.53

-0.07

3.156

472.1

5.58

0.099

26.34

65

Cybele

1861

E. Tempel

123

6.07

0.06

3.429

513

6.37

0.129

3.55

3

Juno

1804

K. Harding

122

7.21

0.22

2.67

399.4

4.36

0.21@

13

324

Bamberga

1892

J. Palisa

121

29.43

0.06

2.683

401.4

4.41

0.285

11.14

107

Camilla

1868

N. Pogson

118

4.84

-0.06

3.488

521.8

6.5

0.084

9.93

532

Herculina

1904

M. Wolf

116

9.41

0.16

2.772

414.7

4.61

0.184

16.36

451

Patientia

1899

A. Charlois

115

9.73

0.07

3.063

458.2

5.36

0.059

15.24

48

Doris

1857

H. Goldschmidt

113

11.89

-0.06

3.112

465.5

5.48

0.064

6.54

29

Amphitrite

1854

A. Marth

120

5.39

0.16

2.554

382.1

4.08

0.066

6.1

423

Diotima

1896

A. Charlois

119

4.62

0.04

3.068

459

5.37

0.052

11.25

121

Hermione

1872

J. Watson

109

-6.1

0.04

3.451

516.3

6.37

0.089

7.56

13

Egeria

1850

A. De Gasparis

107

7.04

0.1

2.576

385.4

4.14

0.121

16.52

45

Eugenia

1857

H. Goldschmidt

107

5.7

0.05

2.721

.407.1

4.49

0.115

6.6

94

Aurora

1867

J. Watson

106

7.22

0.04

3.158

472.4

5.63

0.068

8.01

7

Iris

1847

J. Hind

102

7.14

0.21

2.386

356.9

3.68

0.21

5.51

702

Alauda

1910

J. Helffrich

101

-8.36

0.06

3.194

477.8

5.71

0.041

20.57

372

Palma

1893

A. Charlois

98

-6.58

0.05

3.146

470.1

5.57

0.156

23.85

128

Nemesis

1872

J. Watson

97

39

0.04

2.75

411.4

4.56

0.088

6.25

6

Hebe

1847

K. Hencke

96

7.27

0.25

2.425

362.8

3.78

0.146

14.79

154

Bertha

1875

Prosper Henry

96

?

0.0@

3.184

476.3

5.68

0.094

21.11

76

Freia

1862

H. d'Arrest

95

9.98

0.03

3.39

507.1

6.3

0.186

2.12

130

Elektra

1873

C. Peters

95

5.22

-0.09

3.119

466.6

5.49

0.218

22.88

22

Kalliope

1852

J. Hind

94

4.15

0.12

2.91

435.3

4.97

0.109

13.7

259

Aletheia

1886

C. Peters

92

?

0.04

3.139

469.6

5.6

0.14

10.77

41

Daphne

1856

H. Goldschmidt

91

5.99

-0.07

2.765

413.6

4.59

0.279

15.78

2060

Chiron

1977

C. Kowal

-90

?

?

13.716

2,051.90

50.8

0.382

6.93

747

Winchester

1913

J. Metcalf

89

9.4

0.05

2.998

448.5

5.18

0.245

18.18

120

Lachesis

1872

A. Borrelly

89

(>20)

0.04

3.118

466.4

5.47

0.088

6.96

790

Pretoria

1912

H. Wood

88

10.37

0.03

3.406

509.5

6.29

0.169

20.55

566

Stereoskopia

1905

P. Gotz

88

?

0.03

3.387

506.7

6.27

0.065

4.92

911

Agamemnon

1919

K. Reinmuth

88

-7

0.04

5.201

778.1

11.9

0.068

21.83

153

Hilda

1875

J. Palisa

87

?

0.06

3.969

593.8

7.92

0.142

7.84

194

Prokne

1879

C. Peters

87

-15.67

0.05

2.616

391.3

4.23

0.166

18.53

96

Aegle

1868

J. Coggia

87

?

0.04

3.051

456.4

5.33

0.164

16

59

Elpis

1860

J. Chacornac

87

13.69

0.05

2.713

405.9

4.47

0.094

8.64

386

Siegena

1894

M. Wolf"

87

9.76

0.06

2.896

433.2

4.93

0.169

20.27

Other Selected Asteroids

Asteroid

Diameter

~Mass

Rotation

Orbital

Spectral

Semimajor

Orbital

Orbital

Number and Name

(km)

1015 kg

Period

Period

Class

Axis

Eccentricity

Inclination

243 Ida

58 x 23

100

4.633 hrs

4.84 yrs

S

2.861 AU

0.0451

1.14 deg

253 Mathilde

66 x 48 x 46

103.3

417.7 hrs

4.31 yrs

C

2.646 AU

0.266

6.71 deg

433 Eros

40 x 14 x 14

5

5.270 hrs

1.76 yrs

S

1.458 AU

0.223

10.83 deg

951 Gaspra

19 x 12 x 11

10

7.042 hrs

3.29 yrs

S

2.209 AU

0.1738

4.10 deg

1566 Icarus

1.4

0.001

2.273 hrs

1.12 yrs

U

1.078 AU

0.8268

22.86 deg

1620 Geographos

2

0.004

5.222 hrs

1.39 yrs

S

1.246 AU

0.3354

13.34 deg

1862 Apollo

1.6

0.002

3.063 hrs

1.81 yrs

S

1.471 AU

0.56

6.36 deg

2060 Chiron

180

4000

5.9 hrs

50.7 yrs

B

13.633 AU

0.3801

6.94 deg

2530 Shipka

5.25 yrs

3.019 AU

0.1237

10.10 deg

2703 Rodari

3.25 yrs

2.194 AU

0.0572

6.04 deg

3352 McAuliffe

2 x 5

2.57 yrs

1.879 AU

0.3686

4.77 deg

3840 Mimistrobell

3.38 yrs

2.249 AU

0.0831

3.92 deg

4179 Toutatis

4.6 x 2.4 x 1.9

0.05

irregular

1.10 yrs

S

2.512 AU

0.6339

0.47 deg

4660 Nereus

2

1.82 yrs

1.490 AU

0.3603

1.42 deg

4769 Castalia

1.8 x 0.8

0.0005

0.41 yrs

1.063 AU

0.4831

8.89 deg

1992 KD

3

3.58 yrs

2.341 AU

0.4336

29.0 deg

243 Ida - Imaged by Galileo on 28 August 1993. This image shows a small satellite, subsequently named Dactyl, in orbit about Ida.
253 Mathilde - Target of NEAR mission flyby on 27 June 1997 en route to 433 Eros.
433 Eros - Near-Earth asteroid scheduled to be studied by the NEAR mission, which will be put into orbit about Eros in February 1999.
951 Gaspra - Imaged by Galileo on 29 Oct 1991.
1566 Icarus - Highly eccentric Earth-crossing orbit.
1620 Geographos - Scheduled to be visited by Clementine before a computer malfunction cut the mission short.
1862 Apollo - Earth-crossing asteroid.
2060 Chiron - Asteroid/Comet (95P/Chiron) in chaotic eccentric orbit near Saturn and Uranus. 14 February 1996 perihelion was the
subject of the Chiron Perihelion Campaign.
2530 Shipka - Originally scheduled for October, 2008 flyby by the Rosetta spacecraft on its way to Comet P/Wirtanen
2703 Rodari - Scheduled for May, 2008 flyby by the Rosetta spacecraft on its way to Comet P/Wirtanen
3352 McAuliffe - Amor (Mars-crossing) asteroid originally scheduled for 1999 flyby by the New Millenium Deep Space 1 spacecraft.
3840 Mimistrobell - Scheduled for September, 2006 flyby by the Rosetta spacecraft on its way to Comet P/Wirtanen.
4179 Toutatis - Double object, probably in contact, one 2.5 km and one 1.5 km diameter (estimated), imaged by Arecibo and Goldstone radar. Close approach to Earth of this object (about 1.5 million km) will occur on 29 September 2004.
4660 Nereus - Near-Earth asteroid, target of ISAS (Japan) Muses-C sample-return mission.
4769 Castalia - Double-lobed near-Earth asteroid, each lobe about .75 km diameter. Imaged by Arecibo radar.
1992 KD - Near-Earth asteroid scheduled for 28 July 1999 flyby by the New Millenium Deep Space 1 spacecraft.


Asteroids/UIUC/sulfridg@uiuc.edu /revised August 98