Asteroid Lightcurve Data File
Hamanowa Astronomical Observatory
MPC code D91 Adati

279 Thule	Result	Rotation Period : 0.310000 +/- 0.000008 day Amplitude : 0.081 +/- 0.003 mag,
Observational date: 2008-Apr, 03, 06, 14, 15, 20, 22, 23, 25, 28, 29, 30, May, 03, 06, 11, 15, 17, 20, 21, 23, 27, Jun, 01, 06, 09, 10, 14, 17 ( 26nights) Zero time of the graph: 2008 Apr, 03.40000 day (UT) Observational site: Hamanowa Astronomical Observatory (fukushima-pref, Japan) Telescope : Pellow telescope (D=400mm fl=1800mm Newtonian F=4.5 CCD camera : SBIG ST-8 Filter system : Idas-R (UBVRI) Dark and Flat : Dark-frame and Flat-field were corrected. Light time : corrected. Remarks : Occultation event of TYC 7497200415 by (279)Thule was observed on 2008 Apr, 03.49861 day at Japan. The phase of Thule on that time is 0.09861day of the glaph. (light-time: corrected)

Probably, (279)Thule is a binary asteroid. Observed Long Period.

The analysis of the long period. 　　　　　　　　　　　　　　　　　　　　　　　　　　(day) start / end duration center elapsed time long period Apr, 06.44347 0.06089 Apr, 06.47392 0 ------ Apr, 06.50436 Apr, 15.45567 0.06281 Apr, 15.48708 9.01316 3.00439 Apr, 15.51848 Apr, 30.48865 0.07397 Apr, 30.52564 15.03856 3.00771 Apr, 30.56262 May, 03.49234 0.08079 May, 03.53274 3.00710 3.00710 May, 03.57313 May, 06.50074 0.07867 May, 06.54008 3.00734 3.00734 May, 06.57941 May, 15.51488 ------ ------ ------ ------ ------ May, 21.52931 0.07270 May, 21.56556 15.02559 3.00512 May, 21.60201 May, 27.53795 0.08477 May, 27.58019 6.01453 3.00726 May, 27.62242 Jun, 14.55071 0.08447 Jun, 14.59295 18.01276 3.00213 Jun, 14.63518 The long period of (279)Thule was analyzed with 3.005 +/- 0.003day. To make clear that Thule is a binary asteroid, more observations are necessary on the mext time.

Asteroid lightcurve data top.