PHASE FUNCTION OF LUNAR COLOR RATIO

Yu. I. Velikodsky, Ya. S. Volvach, V. V. Korokhin, Yu. G. Shkuratov, V. G. Kaydash, N. V. Opanasenko, M. M. Muminov, B. B. Kahharov

Institute of Astronomy, Kharkov National University,

Kharkjv, UkraineAndijan-Namangan Scientific Center of Uzbekistan Academy of Sciences, Andijan city, Uzbekistan

2MS3, Moscow, 10-14 Oct., 2011

PHASE FUNCTION OF LUNAR COLOR RATIO

C(λ1/λ2)=A(λ1)/A(λ2)

Lunar samples: phase curves of color ratio C(620/430 nm)

Observations:

• Maidanak (Uzbekistan),

Aug-Oct 2006

• 15-cm refractor (guide of Kharkov telescope)

• Canon EOS 300D

• 20,000 images (130 GB)

• Phase angles 1.6–168°

• "R": 0.61 µm, "G": 0.53 µm, "B": 0.47 µm

PHASE FUNCTION OF LUNAR COLOR RATIO

Map of color ratio C(603/472 nm) at α=16°

PHASE FUNCTION OF LUNAR COLOR RATIO

Phase curves of color ratio C(603/472 nm) for mare (a

red part of Mare Imbrium) and highland (Gylden) sites

1.2

1.22

1.24

1.26

1.28

1.3

1.32

1.34

1.36

1.38

0 20 40 60 80Phase angle, deg

C(6

03

/47

2 n

m)

Mare Imbrium (red part)

Gylden

PHASE FUNCTION OF LUNAR COLOR RATIO

Phase curve of color ratio C(603/472 nm)

averaged over lunar disk

1.2

1.22

1.24

1.26

1.28

1.3

0 20 40 60 80Phase angle, deg

C(6

03/4

72 n

m)

PHASE FUNCTION OF LUNAR COLOR RATIO

Ratio of pairs of ROLO’s model phase curves of disk-

equivalent albedo

1 .3

1 .4

1 .5

1 .6

1 .7

0 2 0 4 0 6 0 8 0P h ase an g le, d eg

C(4

75

/35

5),

C(6

65

,74

5/4

75

)

1.15

1.18

1.21

1.24

C(5

49

/47

5)

C (4 7 5 /3 5 5 n m)C(7 4 5 /4 7 5 n m)C(6 6 5 /4 7 5 n m)C(5 4 9 /4 7 5 n m)