ライトカーブ観測から何がわかるか

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ともみはぎにわ
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2 M 2.5log F F *M M F

6 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 2 (A)/c 2 ] 1/2 A=0 S M / S m =a/b =0 Pospieszalska-Surdej and Surdej(1985)

7 Cellino et al. (1989)

8 Itokawa Kaasalainen et al. (2003) Ostro et al. (2004)

9 Amplitude Epoch Magnusson et al Magnusson et al. 1992

10 B Amplitude ( b / c) 2 ( b / c) cos ( A) + sin ( A) A, α ) = 1.25Log + βα 2 2 cos ( A) + ( b / a) sin ( A) ( 2 B A aspect angle a,b,c Magnusson (1986)

11 Epoch T i T θ θ 0 i 0 ni = P 2π T 0,T i standard feature P n i T 0 T i 0, i T 0,T i 0deg PAB Magnusson (1986)

Itokawa Amplitude Epoch 320 30deg -75 12deg

12 Itokawa Amplitude Epoch deg deg a:b:c=1: : Ohba et al. (2003)

13 Surdej and Surdej (1978)

14 (phase angle bisector) α =0 PAB α =90 PAB PAB PAB

15 Zappala B( α) = (1 + mα) B(0) B m S-type( ) C-type a/b=1.25,1.50,2.00,2.50 Zappala et al.(1990) m S-type 0.03, C-type 0.015, M-type Ohba et al.(2003) m (deg) vs.m. y m

H ( α ) = H (0) 2.5 log[( 1 G ) Φ 1 ( α ) + GΦ 2 ( α )] H( ) Reduced magnitude Reduced magnitude: 1AU H(0) : G: slope parameter: C-type:G=0.

16 H ( α ) = H (0) 2.5 log[( 1 G ) Φ 1 ( α ) + GΦ 2 ( α )] H( ) Reduced magnitude Reduced magnitude: 1AU H(0) : G: slope parameter: C-type:G= S-type:G= E-type:G= H D [ km] = / P V Muinonen et al. (2002) D: H:V P v :V Bowell et al. (1989) Harris (1998)

17 Bidirectional reflectance Lambert: π Lumme-selger Hapke:L-S roughness L&L-S: r r r = A L cos(i) ω cos( i) = 4 π cos( i) + cos( e) 1 = cos( i) + cos( i) + cos( e) c f ( α ) i=e ( =0) I = Jr( i, e, α) Hapke (1993)

18 Merline et al. (2002) Pravec et al. (2000)

19 TNO MBA Merline et al. 2002

20 Merline et al. 2002

21 Pravec et al. 2002

22 Paolicchi et al. 2002

23 Paolicci et al. 2002

24 Toutatis Hudson et al. (2003) Mueller et al. (2002)

25 Radzievskii-Paddack Yarkovsky-O keefe- Bottke et al. 2002

26 Itokawa YORP Itokawa Vokrouhlicky et al. 2004

28 A.Pospieszalska-Surdej and J.Surdej, Determination of the pole orientation of an asteroid. The amplitude-aspect relation revisited Astron. Astropys. 149, (1985) A.Cellino and V.Zappala and P.Farinella, Asteroid Shape and lightcurve morphology Icarus 78, (1989) S. Ostro et al., Radar observations of asteroid Itokawa (1998 SF36) Meteoritics &Planetary Science 39, (2004) M.Kaasalainen et al., CCD photometry and model of MUSES-C target (25143) 1998 SF36 A&A 405, L29-L32 (2003) P.Magnusson et al., Determination of pole orientations and shapes of asteroids in Asteroids II (eds. Binzel et al), (1989) P.Magnusson et al., Asteroid 951 Gaspra: Pre-Galileo physical model Icarus 97, (1992) P.Magnusson, Distribution of spin axes and senses of roation for 20 large asteroids Icarus 68, 1-39 (1986) A.Surdej and J. Surdej, Asteroid lightcurves simulated by the rotation of a three-axes ellipsoid model Astron. Astrophys. 66, (1978) V.Zappala et al., An analysis of the amplitude-phase relationship among asteroids Astron. Astrophys. 231, (1990) Y.Ohba et al., Pole orientation and triaxial ellipsoid shape of (25143) 1998 SF36, a target asteroid of the MUSES-C mission Earth Planets Space, 55, (2003) K.Muinonen et al., Asteroid photometric and polarimetric phase effects in AsteroidsIII (eds. Bottke et al.), (2002)

29 E.Bowell et al., Application of photometric models to asteroids in Asteroids II (eds. Binzel et al.), (1989) A.Harris, A thermal model for near-earth asteroids Icarus 131, (1998) B.Hapke, Theory of reflectance and emittance spectroscopy pp.455, Cambridge Univ. Press (1993) W.Merline et al., Asteroids do have satellites in Asteroids III (eds. Bottke et al.), (2002) P.Pravec et al., Two-period lightcurves of 1996 FG3, 1998 PG, and (5407) 1992 AX: One probable and two possible binary asteroids Icarus 14, (2000) P.Pravec et al., Asteroid rotations in Asteroids III (eds. Bottke et al.), (2002) P.Paolicchi et al., Side effects of collisions: Spin rate changes, tumbling rotation states, and binary asteroids in Asteroids III (eds. Bottke et al.), (2002) R.Hudson et al., High-resolution model of asteroid 4179 Toutatis Icarus 161, (2003) B. Mueller et al., The diagnosis of cmplex rotation in the lightcurve of 4179 Toutatis and potential applications to other asteroids and bare cometary nuclei Icarus 158, (2002) W. Bottke Jr et al., The effect of Yarkovsly thermal forces on the dynamical evolution of asteroids and meteoroids in Asteroids III (eds. Bottke et al.), D. Vokrouhlicky et al., Detectability of YORP rotational slowing of asteroid Itokawa A&A 414, L21-24 (2004)

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<4D F736F F F696E74202D208FAC986690AF82CC89C28E8B91AA8CF58ACF91AA82A982E789BD82AA82ED82A982E982A92E B8CDD8AB B83685D> 第 4 回系外惑星トランジット観測研究会第 7 回小惑星ライトカーブ研究会合同研究会 2010.9.18 19 小惑星の可視測光観測から何がわかるか安部正真 JAXA 本日の話 2004.7.2 小惑星ライトカーブ研究会究会ライトカーブから何がわかるか上記の話に多色測光観測から何がわかるかを加えてまとめてみますできれば最近の話題もライトカーブ観測から何がわかるかライトカーブとは