Japanese activities concerning Maidanak Fumi Yoshida Takashi Ito

Japanese activities concerning Maidanak Fumi Yoshida, Takashi Ito, Shigeru Takahashi, Kiichi Okita, Hiroshi Karoji, Shinobu Ozaki, (NAOJ), Toshifumi Yanagisawa, Hirohisa Kurosaki, Makoto Yoshikawa, Tomohiro Yamaguchi (JAXA), Noritsugu Takahashi, Seitaro Urakawa (JSGC), Hiroshi Ohtani (Kyoto Univ), Yui Nozawa (JWU)

What we did in 2009 1. Cleaning of the mirror of 60 cm telescope at Maidanak observatory 2009 August 2. Re-aluminizing the Maidanak mirrors at Okayama observatory 2009 October to 2010 May 3. Measuring the Seeing size of Maidanak sky 2009 November 4. Holding seminars for asteroid’s observation and data reduction 2010 February 5. Planning on new instruments 6. Carrying out photometric observation of young family asteroids

What we did in 2009 1. Cleaning of the mirror of 60 cm telescope at Maidanak observatory 2. Re-aluminizing the Maidanak mirrors at Okayama observatory Talk by K. Okita 3. Measuring the Seeing size of Maidanak sky Talk by T. Ito 4. Holding seminars for asteroid’s observation and data reduction 5. Planning on new instruments Talk by H. Ohtani 6. Carrying out photometric observation of young family asteroids Talk by S. Takahashi Talk by Y. Nozawa’s talk (tomorrow)

Cleaning of the 60 cm mirror at Measured reflectance of Maidanak the mirror by Scatterometer in 2009 August. Before cleaning 　67. 7% After cleaning 81. 1%

Relative Referectance of all mirrors at Maidanak We measured reflectance of all existing mirrors at Maidanak observatory by Scatterometer in 2009 August. mirror Before cleaning After cleaning 67. 7% 81. 1% cleaned by K. Okita on 2009 Aug 29. 60 cm 77. 8% cleaned by Russia in 2009 July 1. 5 m 85. 9% cleaned by Russia in 2008 autumn 1. 0 m 44. 7% aluminized in Uzbek 7 years ago 65. 2% aluminized in Uzbek 7 years ago 60 cm (sliding roof) (dome) 60 cm (spare) 44. 8% (dirty part) (clean part) note dirty part 44. 8% clean part 65. 2% There is a spare mirror of the 60 cm telescope. It was aluminized in Uzbek 7 years ago. We decided to sent it to Japan and re-aluminized at Okayama Astrophysical observatory of NAOJ.

Export and import of the mirrors for re-aluminization Packing 60 cm Wooden box for 60 cm mirror Fumigated at Yokohama Okayama 2009. 10. 23 2010. 1. 25 50 cm ~ $ 3200 Increased 20 cm Tokyo UBAI 2009. 9. 19 2009. 9. 21 2009. 11. 3 15 cm 2010. 4. 12 -13 ~ $ 1300 Maidanak 2010. 6. ? Realuminizing 60 cm UBAI 2010. 5. 28 50 cm ~ $ 2900 About 8 months 2010. 5. 6 Total cost ~$7400 20 cm 15 cm $0

Re-aluminizing of 60 cm mirror of Maidanak Observatory Date : 2010. 4. 12, 13 Done by : K. Okita, K. Yanagisawa, D. Kuroda, H. Koyano, E. Kanbe (Okayama) T. Ito, F. Yoshida, S. Urakawa (Asteroid group) Procedure : 1. Wash it by water 2. Remove old aluminum coating by Na. OH solution 3. Polish the surface by 2 Na. HCO 3　 4. Wipe it by cotton cloth with alcohol 5. Install the mirrors in the Vacuum chamber 6. Pumping vacuum camber into 5 X 10 -6 torr. (Use the cryio-pump & the Meissner-coil pump) 7. Ion-bombardment (3 X 10 -2 torr 20 min. ) 8. One more Pumping vacuum camber into 5 X 10 -6 torr. (Use the cryio-pump & the Meissner-coil pump) 9. Spatter aluminum (6 times X 6 filaments about 30 min. ) 10. Take out mirrors from the vacuum chamber 11. Packing mirrors to transportation boxs. Okita-san will show you how we did the re-aluminiization with a lot of photos.

Measuring the Seeing size of Date : 2009. 11. 17 Maidanak sky Done by : T. Yanagisawa, H. Kurosaki Celestron C 8 Vixen GPD Takahashi BRC 250 N. I. L. 1 K 1 K N. I. L. 4 K 2. 7 K Showa 25 EL Date Seeing size Nov. 16 2. 03” Nov. 17 2. 75” Nov. 18 2. 64” Nov. 19 2. 79” Seeing size measured by 60 cm telescope at Maidanak with R-band at airmass of 1. 3. (By F. Y. ) The seeing size of Nov. 17’s night is near average (? ). Nyukasa Maidanak Unexpected result Dr. Ito will present their results.

Tutorial of asteroid’s observation and data reduction Date : February 12 - 26, 2010 Participants : Rivkat Karimov (UBAI), Chih-Yang Tai (NCU) Nyugasa-yama Optical Observatory Okayama Astrophysics 35 cm telescope Observatory February 13 -16 1. 88 m telescope February 18 Bisei Spaceguard Center 1 m telescope February 18 -20 IRAF tutorial for data analysis cl scripting, python scripting Found 3 new asteroids February 23, 24 http: //www-irc. mtk. nao. ac. jp/~webadm/AA-Asian. Net/index. php? J-plan 2009#h 25 cda 14

Planning on new instruments 1. Focal reducer of 60 cm telescope for wide field debris survey H. Ohtani will present 2. Making 60 cm telescope automated We investigated the structure of 60 cm telescope in 2009 August. We discussed where encoders should be put around RA and DEC axes. The cost of the improvements was estimated 30 million yen. Now it’s pending. The image of 107 P/(4015) Wilson. Harrington, which is one of NEOs by 60 cm tel. at Maidanak. By K. O Related to Dr. Urakawa’s talk

Photometric observation of young family asteroids 2005 Jun – How many asteroids did we observe so far? With which filter? Asteroid name 1990 rd 1 1990 vz 5 … Obs. period B V 2005 Jun 02 -Jun 06 … 2 … 4 … R I 64 23 87 48 1 55 … Total frames … … Dr. Takahashi will show you the summary of data for young family asteroids. Scientific purpose Estimating a time scale of Space weathering on asteroid’s surface. Ms. Nozawa will show you some results tomorrow.

What we will do in 2010 and 2011 Asteroid observations (young family asteroids, some Near Earth Asteroids moving slowly) 2. Tutorial of asteroid observation and data analysis 3. Maidanak Users meeting 1. 1 st Maidank Users meeting at SNU, Seoul, on June 30, 2009. 4. Our budget is not enough for new instrumentation. 5. We keep trying to apply funds.

Thank you very much for your attention