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Ursa Astronomical Association

3122 Florence - 1.9.2017 at 21.40 - 2.9.2017 at 00.55 Pieksämäki Observation number 66638

Visibility III / V

Timo Kantola, Ursa (Itä-Suomi)

Slightly surprisingly, the cloudy weather was able to accommodate a clear night of asteroid 3122 Florence on a short pass night of 1-2.9.

At a distance of 0.0473 AU (about 7.1 million km.) 4x1.5km, the asteroid was shown in the images at about 9 mag. subject. Once the weather was on and the subject was appropriately in sight, I photographed the series and tried to determine the spin time for the asteroid. According to internet data, the amplitude of light variation would be 0.18mag, and the rotation time 2.3581h (Ephemerides of Minor Planets for 2000, de l 'Institute of Applied Astronomy)

The "fast" movement of the asteroid in the sky forced the image field to move every 40min. With the transfer, the light curve had to be made in 5 sections and this made it difficult to get the magnitudes in place, there were not enough bright calibration stars. The same calibration stars have been used in the two faulty sections.

Of the 453 images, the period determined was 2.3438h (ANOVA) and 2.35294h (AoV)

Amplitude became 0.21mag (with small charge)

Additional information
  • Observation target
    • Asteroid
  • Name of the observation target
    • 3122 Florence
    • Keskitaso
  • Seeing
    • Average
Technical information

SPX 300F4 Newton, ASA DDM60, Atik 314L +, Baader MPCC, Johnson-V filter. 10sec exposures. Soft MunWin (calibration), FotoDiff (measurement) and Peranso (combining light curves and determining the period).

Comments: 1 pcs
Rauno Paivinen - 3.9.2017 at 08.53 Report this

Erittäin hienoa havainto!

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