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2 Introduction... Ceres, Juno, Vesta, Ida, Mathilde, Eros, Gaspra, Itokawa Ceres Juno, Vesta, Ida, Eros, Gaspra.

Surface Color Variation of Ida and Vesta Ida: 48-49

3 Surface Color Variation of Ida and Vesta Ida: Veverka et al., 1996; Helfenstein et al., 1996 Vesta: Binzel et al., µm µm µm µm

4 Previous Studies /51 < 0.05mag Groeneveld and Kuiper, 1954; Wamsteker and Sather, 1974; Lustig and Dvorak, 1975; Gehrels and Taylor, 1977; Blanco and Catalano, 1979; Gaffey and Gilbert, 1979; Gaffey (in Degewij et al., 1979); Tedesco, 1979; Degewij et al., 1979; Schober and Surdej, 1979; Tdesco and Bowell, 1979; Tedesco, 1979; Helensten et al., 1994; Mottola et al., 1994; Helensten et al., 1996;Brown et al., 1999; Hainaut et al., 2000;Mothe-Diniiz et al., 2000; Mothe-Diniiz et al., 2001; Sekiguchi et al., 2002; Baliunas et al., 2003; Tupieva, 2003; Lazzarin et al., 2004; Sasaki et al., 2004; Yoshida et al., 2004; Hardersen et al., 2005; Lopez-Gonzalez and Podriguez, 2005; Nathues et al., 2005; Tegler et al., 2005

5 Previous Methods :. :. ( ) :. :. Rodriguez and Lopez-Gonzalez (1999,2000)Lopez-Gonzalez and Rodriguez (2005) photometer. 13 (10)Hygiea.

6 This work :.. :. (0.01 ). ( 50 )

岡山天体物理観測所装置: 口径50cm望遠鏡 3色(V, R, I)同時測光カメラ光学系: クラシカルカセグレン口径 :

7 Okayama MITSuME Telescope Multicolor Imaging Telescopes for Survey and Monstrous Explosions ガンマ線バースト残光追跡観測を目的としたプロジェクト場所: 国立天文台岡山天体物理観測所装置: 口径50cm望遠鏡 3色(V, R, I)同時測光カメラ光学系: クラシカルカセグレン口径 : 50[cm] 口径比: F/6.5 開発 : 中央光学+岡山観測所 3色同時測光カメラの制御ソフトウェアの開発. in MITSuME Project

8 Light Path in Tricolor Camera :

9 Data Analysis Relative Photometry :... :...

10 Observations a*: Semimajor axis (AU) 3 8. Harris et al., 2005

11 Color Lightcurve Example (00152) Atala Rotational Period: ± [hour] r i r-band v,i. v

12 Results (r-band Periodic Analysis) Number Name Period [hour] Error [hour] Previous Period [hour] (00065) Cybele (00125) Liberatrix (00152) Atala (00201) Penelope(Mar.) (00201) Penelope(May) (00216) Kleopatra (00250) Bettina (00321) Florentina (00367) Amicitia (00378) Holmia (00433) Eros (00512) Taurinensis (00517) Edith (00585) Bilkis (00762) Pulcova (00797) Montana (00852) Wladilena Erikson, 2000; Fauerbach and Bennett, 2005; Behred,2004; Erikson and Magnusson, 1993; Pilcher and Tholen, 1982; Slivan et al., 2004; Wisniewski et al., 1996 di Martino et al., 1996; Miller et al., 2002; Piironen et al., 1998; Koff, 2004; Robinson and Warner, 2002; Davis, 2001; Ditteon et al., 2004; Harris et al., 1999.

13 Detection Boundary. r-band v-i 1σ v i v-i. v-i.. ±1σ

14 Detection or No Detection 2σ. v-i, v-r, r-i.

15 No Detected Objects

16 No Detected Objects (List)

17 Detected Objects

18 Detected Objects (List)

19 Detected Objects 2

20 Detected Objects 2 (List)

21 Verification of Color Variation 3 5.

22 Results (Local Color Difference) Number Name Type v-i [mag] r-i [mag] v-r [mag] (00065) Cybele X (00125) Liberatrix X (00152) Atala S (00201) Penelope(Mar.) X (00201) Penelope(May) X (00216) Kleopatra X (00250) Bettina X (00321) Florentina S (00367) Amicitia S? (00378) Holmia S (00433) Eros S (00512) Taurinensis S (00517) Edith C (00585) Bilkis C (00762) Pulcova C (00797) Montana S (00852) Wladilena S? S-type : 8/8, X-type: 3/5, C-type:2/3

23 Results (Detection Ratio of Color Variation) : 39/63 S-type.

24 Amplitude Dependence S-type, M-type, C-type X v-i

25 Mean Diameter Dependence S-type, M-type, C-type, X v-i

26 Albedo Dependence S-type, M-type, C-type X v-i Tedesco et al., 1992; Tedesco et al., 2002

27 Implication of Color Variation 1 Hardersen et al. (2005) IRTF M-type 1µm. Weak or Absent = 0, Present = 1.

28 Implication of Color Variation 2.

29 Summary 3 13/

ライトカーブ観測から何がわかるか

ライトカーブ観測から何がわかるか 2004.7.2 M 2.5log F F 10 0.4*M M F S= (abc)[sin 2 A(sin 2 ( )/a 2 +cos 2 ( )/b 2 )+cos 2 (A)/c 2 ] 1/2 a,b,c A aspect angle S M = (abc)[sin 2 (A)/b 2 +cos 2 (A)/c 2 ] 1/2 S m = (abc)[sin 2 (A)/a 2 +cos