1. 2.4m Telescope Group Yunnan Observatory of CAS Status of LiJET Project & The Coude Echelle Spectrograph for the Lijang 1.8m Telescope China-Japan Collaboration Project Meeting @Xinglong Chang, Liang 常 亮 Yunnan Astronomical Observatory 雲南天文台 changliang@ynao.ac.cn

2. 2.4m Telescope Group Yunnan Observatory of CAS 1. LiJ iang Extremely High Precision E xtraSolar Planet T racker 1 ） LIJET Project collaborators: China: USTC, YNAO, NJU USA: UFL Supported by Chinese Academy of Science and National Science Foundation of China, University of Florida, and National Science Foundation of USA and also participating institutions including YNAO, USTC, and NJU. 2 ） Our Design Goals: * Use low-cost, compact, robust, low maintenance, but high precision and throughput Doppler instruments * Target bright F,G,K dwarfs (V<8) with slow rotation for detection of super Earth mass planets, including habitable ones * Integrate at least 15 min to minimize RV noises from stellar oscillations for low mass planet detection

3. 2.4m Telescope Group Yunnan Observatory of CAS * A nearly perfect match of ~15 min exposure time requirements and photon noise limit offered by a 2 meter telescope for 0.5-1 m/s For astro-seismology, only target V<5 stars and ~1 min exposures * Target faint solar type stars up to V~12 for moderate-high Doppler precision measurements Offer continuous high precision radial velocity measurements for V<8 F,G,K stars with 0.5- 1 m/s Doppler precision in 30 min or less Follow up planet candidates from SDSS-III MARVELS planet survey Observe other science targets provided by the consortium members * Network resources will be available to the entire consortium members

4. 2.4m Telescope Group Yunnan Observatory of CAS 3 ）. Summary of optical characteristics TelescopeLijiang 2.4m, F/8 Fiber Input Focal RatioF/4 Fiber Output Focal RatioF/4 Slit Size72um Main disperserR2 Echelle, 63deg blaze, 87 l/mm Cross disperserPBM2Y prism, 45 deg apex angle Collimated beam size85mm Detector4096 x 4096 CCD, 15 micron pixels Spectra RangeRVM: 390nm-690nm; DEM: 390nm-1000nm Spectra ResolutionRVM: R=18000, DEM: R=27000 Fiber core diameterRVM: 105um; DEM: 50um

5. 2.4m Telescope Group Yunnan Observatory of CAS 5 LiJET inside LiJET setup in the UF lab

6. 2.4m Telescope Group Yunnan Observatory of CAS LIJET telescope interface including a fiber feeding system, a fiber tip guiding and a calibration fiber light source. The calibration light was fed from the calibration lamps on the calibration bench inside the instrument control chassis

7. 2.4m Telescope Group Yunnan Observatory of CAS 4 ) LiJET Status ☺ LiJET already be packed in UF, will ship to China for commissioning in December or Next January （ It depends on China Customs ） ☺ LiJET RMS RV errors are close to the required values, <1.5m/s for bright calibration sources in UF lab now. ☺ We already built a instrument room for LiJET in 2.4m telescope basement. It’s a temperature and humidity stable room, temperature design goal is ±0.5 ℃,it have reached ±0.2 ℃ precision in 3 months. And humidity is controlled in 40%-60%. ☺ We have prepared all tools and spare parts for LiJET set up for commissioning.

8. 2.4m Telescope Group Yunnan Observatory of CAS ***Commissioning Plan, Instrument Testing and Early Science*** ☺ ~6 months of commissioning (weather and instrument unpredicted nature and past EXPERT experience), one run/month, ~15 nights/run; ☺ First run with three weeks, 1st week, hardware installation, 2nd week integration with the telescope, 3rd week trial observations; ☺ Results to meet proposal requirements; ☺ Short (<14 days) and long term (~1 yr) RMS precision; ☺ Commissioning targets (≥2 RV stable starts, ≥2 RV known planets (one with short period and one with > 1 month period); ☺ Early Science: No promise of any science results, but demonstrate its science capability; ☺ Commissioning science targets: In Aug. 12th, 2010, the LiJET Project Collaborators discussed detailed commissioning science targets at Hefei City; It includes ~1 m/s science, ~3 ‐ 5 m/s science within 6 months and other science targets and plan.

9. 2.4m Telescope Group Yunnan Observatory of CAS 2. The Coude Echelle Spectrograph for the Lijang 1.8mTelescope 1)1.8m Telescope optical System Cassegrain system Primary Mirror: Paraboloid, Clear Aperture:1760mm Focal Ratio: F/1.5 Two Secondary Mirrors: Hyperboloid Coude Focus : F/# = 89 Nesmyth Focus: F/# = 12 FOV: Nasmyth:18’×18’, Coude:±1.5’

10. 2.4m Telescope Group Yunnan Observatory of CAS Alt-Azimuth Mounting The Mass:25000kg The Hight ： 7.2m

11. 2.4m Telescope Group Yunnan Observatory of CAS

12. 2.4m Telescope Group Yunnan Observatory of CAS

13. 2.4m Telescope Group Yunnan Observatory of CAS 2 ） 1.8m Telescope Reducer Design Design Description ： * From F/89 to F/45 * FOV: 3’ * Spectra Range:330nm-1100nm Blue Region: 331.17nm-577.42nm, Central wavelength 402.13nm Red Region 562.98nm-1103.39nm, Central wavelength 703.73nm Clear Aperture: 149.03 mm

14. 2.4m Telescope Group Yunnan Observatory of CAS

15. 2.4m Telescope Group Yunnan Observatory of CAS TelescopeLijiang 1.8m, F/89 Input Focal RatioF/45 Main disperserR2 echelle grating 79 gr/mm R2 echelle grating 31/.6 gr/mm Cross disperser60 degree UBK7 prism.60 degree ZF3 prism. Spectra Range330-580nm580-1100nm Spectra Resolution8200 37000 170000 12000 44000 170000 WHEN ?????

16. 2.4m Telescope Group Yunnan Observatory of CAS THE END THANKS