The six-day rotation period of 1689 Floris-Jan - A new record among slowly rotating asteroids

Details The six-day rotation period of 1689 Floris-Jan - A new record among slowly rotating asteroids The six-day rotation period of 1689 Floris-Jan - A new record among slowly rotating asteroids

Nov 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982a%26a...115..257s&link_type=abstract

Astronomy and Astrophysics, vol. 115, no. 2, Nov. 1982, p. 257-262. Research supported by the Osterreichischer Fonds zur Forder

Astronomy and Astrophysics

Astrophysics

9

Asteroids, Light Curve, Planetary Rotation, Rotating Bodies, Color, Electrophotometry, Magnitude, Periodic Variations

Scientific paper

The small sized asteroid 1689 Floris-Jan was observed photoelectrically in UBV at ESO and CTIO, Chile, and at Mt. Table Mountain JPL, California, during its opposition in 1980, between Oct. 7 and Nov. 6, 1980. A unique synodic rotation period P = 145h.0 + Oh.5 corresponding to 6d.042 + 0d.021 could be derived from a lightcurve observed during 0.6 of the rotational phase. The lightcurve should show the usual double wave characteristic with an amplitude of 0.4 mag or slightly more.
Absolute magnitudes were computed with a linear extrapolation, using a mean phase coefficient of 0.039 mag/deg, yielding barV(1,0)=12.08 and V0(1,0)=11.88; colors were derived as B-V =0.70±0.04 and U-B=0.25±0.05, with no variation over the observed rotational phases exceeding the scatter. From the colors alone it is evident that 1689 Floris-Jan is not a S-type asteroid, therefore belonging to groups CME or U, with a diameter between 9 and 27 km approximately, depending on the albedo assumption.
The rotation period of six days found for 1689 Floris-Jan is the longest one ever published for an asteroid. A histogram is therefore given for 300 published asteroid rotation rates in order to show the exceptional position of 1689 Floris-Jan among other asteroids. In addition there are indications that small asteroids are not necessarily fast rotators, but rather that they have also a trend to show up as slow rotators.

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