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 20091. Cleaning of the mirror of 60cm telescope at

Maidanak observatory2009 August

2. Re-aluminizing the Maidanak mirrors at Okayama observatory

2009 October to 2010 May

3. Measuring the Seeing size of Maidanak sky2009 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

Cleaning of the 60cm mirror at MaidanakMeasured reflectance of

the mirror by Scatterometer in 2009 August.

Before cleaning After cleaning

　 67.7% 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 cleanin

g

After cleanin

g

note

60cm (sliding

roof)

67.7% 81.1% cleaned by K. Okita on 2009 Aug 29.

60cm (dome)

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

60cm (spare)

44.8% (dirty part)

65.2% (clean part)

aluminized in Uzbek 7 years ago

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

Tokyo2009.9.19

Wooden box for 60 cm

mirrorFumigated at Yokohama

UBAI2009.9.21

~ $ 1300

Increased

60cm

50cm

20cm 15cm

Packing

2009.10.23

2009.11.3

~ $ 3200

Okayama2010.1.25

Re-aluminizing2010.4.12-13

60cm

50cm

20cm 15cm

~ $ 2900

2010.5.6

UBAI2010.5.28

60cmMaidanak2010.6.?

About 8 months

Total cost ~$7400 $ 0

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 :

Re-aluminizing of 60cm mirror of Maidanak

Observatory

1. Wash it by water2. Remove old aluminum coating by

NaOH solution3. Polish the surface by 2NaHCO3 　4. Wipe it by cotton cloth with alcohol 5. Install the mirrors in the Vacuum

chamber6. Pumping vacuum camber into 5X10-6

torr. (Use the cryio-pump & the Meissner-coil pump)

7. Ion-bombardment (3X10-2 torr 20min.) 8. One more Pumping vacuum camber into

5X10-6 torr. (Use the cryio-pump & the Meissner-coil pump)

9. Spatter aluminum (6 times X 6 filaments about 30min.)

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 Maidanak skyDate : 2009. 11. 17

Done by : T. Yanagisawa, H. Kurosaki

Unexpected result

Celestron　C8

Vixen　GPD

N.I.L.　1K1K

Celestron　C8

N.I.L.　1K1K

N.I.L.　4K2.7K

Takahashi　BRC250

Showa　25ELMaidanak Nyukasa

Date Seeing size

Nov. 16

2.03”

Nov.17 2.75”

Nov.18 2.64”

Nov.19 2.79”

Dr. Ito will present their results.

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 (?).

Tutorial of asteroid’s observation and data

reduction

Nyugasa-yama Optical Observatory 35 cm telescopeFebruary 13-16

Date : February 12 - 26, 2010Participants : Rivkat Karimov (UBAI), Chih-Yang Tai (NCU)

Okayama Astrophysics Observatory

1.88 m telescopeFebruary 18

Bisei Spaceguard Center 1 m telescope

February 18-20

Found 3 new asteroids

IRAF tutorial for data analysiscl scripting, python scriptingFebruary 23,24

http://www-irc.mtk.nao.ac.jp/~webadm/AA-AsianNet/index.php?J-plan2009#h25cda14

Planning on new instruments

1. Focal reducer of 60cm telescope for wide field debris surveyH. Ohtani will present

We investigated the structure of 60cm 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.

2. Making 60 cm telescope automated

By K.O

The image of 107P/(4015) Wilson-Harrington, which is one of NEOs by 60 cm tel. at Maidanak.

Related to Dr. Urakawa’s talk

Photometric observation of young family

asteroids2005 Jun – How many asteroids did we observe so far? With which filter?

Asteroid name

Obs. period B V R I Total frames

1990rd1 2005 Jun02-Jun06 64 23 87

1990vz5 2005 Jun02-Jun06 2 4 48 1 55

… … … … … … …

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

1. Asteroid observations (young family asteroids, some Near Earth Asteroids moving slowly)

2. Tutorial of asteroid observation and data analysis

3. Maidanak Users meeting

4. Our budget is not enough for new instrumentation.

5. We keep trying to apply funds.

1st Maidank Users meeting at SNU, Seoul, on June 30, 2009.

Thank you very much for your attention