DAMIT

Database of Asteroid Models from Inversion Techniques – more about DAMIT

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Database – Tumblers

Columns: standard | extended

Number Name Designation Files Comment
λL βL Pφ Pψ Files Comment Reference φ0 ψ0 θ0 I1 I2 L JD0 LSM p1 p2 p3 p4 p5 Cal. size D σD Version
2008 TC3 LCref | LC
90 −36 0.02694 0.02755 LCfitPNGSHP Scheirich et al. (2010) 327 345 59 3.20 2.79 694.49 2454746.382360 LSL 0.1 yes 0.0036 0.0005 2010-11-12
275 3 0.02695 0.02756 LCfitPNGSHP Scheirich et al. (2010) 356 165 59 3.20 2.80 694.48 2454746.382360 LSL 0.1 yes 0.0036 0.0005 2010-11-12
99942 Apophis LC
250 −75 27.38 263 LCfit | PNG | SHP Pravec et al. (2014) 152 14 0.61 0.965 2456284.676388 H 0.369 -0.308 1.81 0.11 20 no 2014-07-13

  • 2008 TC3 (MPEG-4/AVI 22.6 MiB) – This movie shows the excited rotation of the asteroid 2008 TC3 viewed from the Earth. The time covers the interval of lightcurve observation (two hours). The motion is about 30 times faster than in reality. The relative time t is shown together with the solar phase angle α.
  • Description

    Tumblers are asteroids that are in excited rotational states. Their rotation can be described as free precession. For details see Kaasalainen (2001).

    The rotational states of tumblers are described by different set of parameters than the states of "standard" asteroids in the main database. Therefore the database of tumblers contains different fields (columns) which are described below.

    Asteroid columns
    Column Meaning
    Number Asteroid's number label.
    Name Asteroid's name label.
    Designation Asteroid's designation label.
    Files The corresponding files (e.g. LC – lightcurves).
    Comment The field reserved for additional information.
    Model columns – standard
    Column Meaning
    λL The ecliptic latitude of the direction of the angular momentum vector (J2000.0, in degrees).
    βL The ecliptic longitude of the direction of the angular momentum vector (J2000.0, in degrees).
    Pφ The precession period (hours).
    Pψ The rotation period (hours).
    Files The corresponding files.
    Comment The field reserved for additional information.
    Model columns – extended
    Column Meaning
    Reference List of the references related to the model.
    φ0 The initial precession angle for JD0 (degrees).
    ψ0 The initial rotation angle for JD0 (degrees).
    θ0 The initial nutation (tilt) angle for JD0 (degrees).
    I1 The moment of inertia (I3 = 1).
    I2 The moment of inertia (I3 = 1).
    L The size of the angular momentum vector.
    JD0 The initial Julian date.
    LSM 1  Light-scattering model – LSL = Lambert + Lommel-Seeliger; H = Hapke.
    p1 1  The lambertian part of LSL; the single-particle scattering albedo w for H.
    p2 1  The amplitude a of the phase angle function for LSL; the assymetry parameter of the single-particle phase function g for H.
    p3 1  The width d of the phase angle function for LSL; the opposition surge amplitude B0 for H.
    p4 1  The slope k of the phase angle function for LSL; the opposition surge width h for H.
    p5 1  The macroscopic roughness θ0 for H.
    Cal. size Calibrated size – 'yes' when the shape model is scaled to the real size (in km), 'no' otherwise (models are scaled to unit volume).
    D Equivalent diameter (in km) – The diameter of a sphere that has the same volume as the shape model.
    σD Equivalent diameter error (in km) – The estimated error of the equivalent diameter.
    Version The version of the model. Usually in the format of date (YYYY-MM-DD).

    Note 1: Default values are: Light-scattering model = 'LSL'; p1 = 0.1; p2, p3, p4, p5 not defined.

    References