Table 3
Summary of spin-state parameters for (85990) 1999 JV6 from light-curve inversion and radar-based approaches.
Parameter | Light curve | Radar and light curve |
---|---|---|
λ | 55° | 132° |
β | − 75° | −86 ° |
Pole error | 15° | 5° |
T0 [JD] | 2454162.5 | 2457425.21401 |
P [h] | 6.536780 | 6.536787 |
ΔP [h] | 0.000008 | 0.000007 |
ν [ × 10−8 rad d−2] | <8.5 | 3.1 ± 2.4 |
Obliquity | 160.0 | 173.8 |
Notes. The presented sets of parameters correspond to the best-fit solutions from two approaches to shape modelling; in the “Light curve” column for the output of convex-light-curve inversion, and in the “Radar and light curve” column for a result of a global shape modelling that included both the radar and light-curve data. The table lists: the ecliptic coordinates of the rotation pole, longitude (λ) and latitude (β), the “Pole error” radius, the model epoch (T0), the sidereal rotation period (P) with uncertainty (ΔP), and the YORP spin-up factor (ν), which is an upper limit for the convex light-curve inversion and a quadratic fit to the phase offset measurements for the radar-derived constant-period solution. Due to the rotational pole location at low ecliptic latitude, the uncertainty in pole determination is given as a radius of a circle on the celestial sphere. The uncertainties in pole and period are given as standard deviation of the model within 10% increase of the minimum χ2 value. The obliquity, the angle between the rotational pole of the asteroid and its orbital momentum, listed in the last row is calculated assuming an orbital inclination 5.3° and longitude of the ascending node 124.5° (JPL solution number 245 from the Horizons ephemeris system, https://ssd.jpl.nasa.gov/).
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