V-type asteroids in the middle Main Belt

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    arXiv:0707.1012v2

    [astro-ph]

    31Jul2007

    1

    2

    2.1 < a < 2.5

    2.5 < a < 2.8

    http://arxiv.org/abs/0707.1012v2http://arxiv.org/abs/0707.1012v2http://arxiv.org/abs/0707.1012v2http://arxiv.org/abs/0707.1012v2http://arxiv.org/abs/0707.1012v2http://arxiv.org/abs/0707.1012v2http://arxiv.org/abs/0707.1012v2http://arxiv.org/abs/0707.1012v2http://arxiv.org/abs/0707.1012v2http://arxiv.org/abs/0707.1012v2http://arxiv.org/abs/0707.1012v2http://arxiv.org/abs/0707.1012v2http://arxiv.org/abs/0707.1012v2http://arxiv.org/abs/0707.1012v2http://arxiv.org/abs/0707.1012v2http://arxiv.org/abs/0707.1012v2http://arxiv.org/abs/0707.1012v2http://arxiv.org/abs/0707.1012v2http://arxiv.org/abs/0707.1012v2http://arxiv.org/abs/0707.1012v2http://arxiv.org/abs/0707.1012v2http://arxiv.org/abs/0707.1012v2http://arxiv.org/abs/0707.1012v2http://arxiv.org/abs/0707.1012v2http://arxiv.org/abs/0707.1012v2http://arxiv.org/abs/0707.1012v2http://arxiv.org/abs/0707.1012v2http://arxiv.org/abs/0707.1012v2http://arxiv.org/abs/0707.1012v2http://arxiv.org/abs/0707.1012v2http://arxiv.org/abs/0707.1012v2http://arxiv.org/abs/0707.1012v2http://arxiv.org/abs/0707.1012v2http://arxiv.org/abs/0707.1012v2http://arxiv.org/abs/0707.1012v2http://arxiv.org/abs/0707.1012v2http://arxiv.org/abs/0707.1012v2http://arxiv.org/abs/0707.1012v2http://arxiv.org/abs/0707.1012v2
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    2.54

    2.53

    D

    D 5

    D 3

    3.5

    2.5 < a 2.62

    D > 1

    http://arxiv.org/abs/astro-ph/0609420
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    2.5 < a < 2.82

    0.9

    a < 2.5

    a > 2.82

    D 17

    2

    D 5

    a 2.65

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    u,g,r,i,z

    ap ep sin Ip

    H D

    ap ep sin Ip H D

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    V = 12.4 V = 12.4

    r

    V

    < 1.5

    r V

    20h44m53.01s 245712.8 20.9 91.9

    14h11m29.86s 240144.8 4.1 169.8

    0.7

    0.73

    0.522 0.938

    R 3000 0.90 R 200

    0, 75

    4

    20

    0.90 70

    V > 11

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    0.90

    nexp Texp Ttotal

    3

    2

    0.90

    tcross

    a da/dt

    tcross tinst tinst

    188207

    http://hamilton.dm.unipi.it/cgi-bin/astdys/astibohttp://staff.on.br/froig/vtypes
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    9500

    2.485 ap 2.490

    da/dt > 0

    = 3J J,

    d2rdt2

    Yarko

    = GM2a2

    dadt

    vv2

    G M a

    r, v da/dt

    da

    dt 2.5 104

    1 km

    Dcos

    D

    da/dt < 0

    0,

    (1.0 0.1) 104

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    D 2.5

    (1.00.1)103

    D 250

    97

    3

    a > 2.5

    104

    5000

    fcross

    da/dt 104 fcross1.0 0.1 0.0033 0.0019

    10.0 1.0 0.029 0.005

    g 2g6+ g5 g g5, g6

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    fcross

    fcross

    da/dt

    fcross(D) 0.00751 km

    Dcos .

    1 km D 5 km

    0.5 104

    a > 2.5

    0.1

    D D + dD

    age

    dNa>2.5(D) = dN0(D) fcol(D) freach(D) fcross(D)

    dN0(D)

    fcol(D) [D, D + dD] age

    dN0(D) fcol(D)

    dN(D) freach(D)

    age

    fcross(D)

    age

    age 1

    age 1.2

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    3.5 age 3.5

    age

    freach

    age

    10000

    vej

    vej

    v2ej v2esc > 0 and v

    2ej v

    2cut < 0

    vesc = 314

    vcut = 600

    ap, ep, Ip

    cos

    1 age

    freach a > 2.5

    freach(D) age vej freach

    vej D 0

    cos < 0

    freach 0

    freach

    dN(D)

    D 460

    25 D 130 8 D 15

    D < 8

    v2ej

    vesc =

    q1.64 G 4

    3R2

    R

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    dN(D) n(D)

    dN(D) = n(D) dD

    > D

    N(D) = Dmax

    D

    n(D) dD.

    Dmax

    D < 8

    N0D

    N0

    N0

    D < 5.5

    n0D1

    > D

    age

    Na>2.5(D) =

    D

    max

    D

    n(D) freach(D) fcross(D) dD.

    Dmax = 8

    vej = 200 age

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    Na>2.5(D) age

    Na>2.5 D 5

    D 3

    Na>2.5 age 3.5

    2.5 < a 2.6

    Na>2.5

    nV(H) dH nobsV (H) dH

    nobsV (H) dH = b(H) nV(H) dH

    b(H)

    nobsV

    b(H) nSDSS(H) dH

    nknow(H) dH

    nSDSS dH 2.5 < a 2.6

    nknow dH

    b(H) H 13.0

    0.22 H 13.0

    nobsV

    2.5 < a 2.6

    u u 0.35

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    g,r,i,z u

    2.5 < a 2.6

    a > 2.5

    Na>2.5

    Na>2.5 age = 3.5

    10

    10

    age 3.5

    10

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    3

    2

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    A

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    a,

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    freach

    age vej

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    Na>2.5 age

    vej = 200

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    2.5 < a 2.6

    nknowH nsdssH

    n H = 1

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    2.5 < a 2.6

    Na>2.5 age = 3.5