设为首页收藏本站
开启辅助访问 切换到宽版

科学网

 找回密码
  注册
科学网 › 标签 › telescope

tag 标签: telescope

相关帖子

 版块 作者 回复/查看 最后发表

没有相关内容

相关日志

Commissioning tools
qianlivan 2015-12-23 14:38
tablecube.pro table_cube.pro.txt radec2azel.py radec2azel.py.txt azel2radec.py azel2radec.py.txt j2000tojnow.py j2000tojnow.py.txt rise_set.py rise_set.py.txt ========================================================================= #radec2azel.py import ephem import numpy as np import time import sys if (len(sys.argv)3): print 'too few input parameters, format:' print 'python radec2azel ra dec' print 'example:' print 'python radec2azel 20.0 20.0' sys.exit() convert=np.pi/180.0 class coordinate: def __init__(place): place.name='' place.ra='' place.dec='' Dawodang=coordinate() Dawodang.name='Dawodang' Dawodang.ra='106.856594' Dawodang.dec='25.652939' def ectolocal(ra,dec): global convert getlocal = ephem.Observer() getlocal.long, getlocal.lat = Dawodang.ra,Dawodang.dec # at Dawodang ct = time.gmtime() ct3 = time.strftime(%Y/%m/%d %H:%M:%S,ct) getlocal.date = ct3 # UT body = ephem.FixedBody() body._ra = ra body._dec = dec body._epoch = ephem.J2000 body.compute(getlocal) x= float(body.az)*180/np.pi y= float(body.alt)*180/np.pi return x,y #ra0=float(sys.argv )*convert #dec0=float(sys.argv )*convert ra0=ephem.degrees(ephem.hours(sys.argv )) dec0=ephem.degrees(sys.argv ) print ra0,dec0 az,el=ectolocal(ra0,dec0) print az,el ========================================================================= ========================================================================= #azel2radec.py import ephem import numpy as np import time import sys if (len(sys.argv)3): print 'too few input parameters, format:' print 'python azel2radec az el' print 'example:' print 'python azel2radec 20.0 20.0' sys.exit() convert=np.pi/180.0 class coordinate: def __init__(place): place.name='' place.ra='' place.dec='' place.alt='' Dawodang=coordinate() Dawodang.name='Dawodang' Dawodang.ra='106.856594' Dawodang.dec='25.652939' Dawodang.alt='1138.72178' def localtoec(az,el): global convert getlocal = ephem.Observer() getlocal.long, getlocal.lat = Dawodang.ra,Dawodang.dec # at Dawodang getlocal.pressure = 0 getlocal.epoch = ephem.J2000 ct = time.gmtime() ct3 = time.strftime(%Y/%m/%d %H:%M:%S,ct) getlocal.date = ct3 # UT ra,dec = getlocal.radec_of(az,el) return ra,dec az0 = float(sys.argv )*convert el0 = float(sys.argv )*convert ra,dec=localtoec(az0,el0) print ra,dec #print float(ra)/convert,float(dec)/convert print ephem.degrees(ra)/convert,ephem.degrees(dec)/convert ========================================================================= ========================================================================= #j2000tojnow.py import ephem import numpy as np import time import sys if(len(sys.argv)3): print 'too few input parameters, format:' print 'python j2000tojnow ra dec' print 'example:' print 'python j2000tojnow 20.0 20.0' sys.exit() convert=np.pi/180.0 ra0=ephem.degrees(ephem.hours(sys.argv )) dec0=ephem.degrees(sys.argv ) star = ephem.FixedBody() star._ra = ra0 star._dec = dec0 star._epoch = '2000' star.compute(epoch=ephem.now()) print star.ra,star.dec print ephem.degrees(star.ra)/convert,ephem.degrees(star.dec)/convert ========================================================================= ========================================================================= # rise_set.py import ephem import numpy as np import time import sys if (len(sys.argv)3): print 'too few input parameters, format:' print 'python rise_set ra dec' print 'example:' print 'python rise_set 20.0 20.0' sys.exit() convert=np.pi/180.0 Dawodang=ephem.Observer() Dawodang.lat='25.652939' Dawodang.lon='106.856594' body = ephem.FixedBody() ra0=ephem.hours(sys.argv ) dec0=ephem.degrees(sys.argv ) body._ra=ra0 body._dec=dec0 trise=Dawodang.previous_rising(body) print 'previous rise' print body.alt,body.az,trise ttrans=Dawodang.next_transit(body) print 'next transit' print body.alt,body.az,ttrans tset=Dawodang.next_setting(body) print 'next setting' print body.alt,body.az,tset ========================================================================= 20160813.zip pyfast.zip testgetvelo_Ngaussian.zip
个人分类: 存档|3186 次阅读|0 个评论
这是什么?请猜猜看.
jlpemail 2014-6-20 06:54
拍摄于北京 西南 丘陵地
个人分类: 卫星与激光|2523 次阅读|0 个评论
[转载]Extremely large telescope 维基百科
yshimp 2012-7-7 14:17
[转载]Extremely large telescope 维基百科
http://en.wikipedia.org/wiki/Extremely_Large_Telescope An extremely large telescope (ELT) is an astronomical observatory featuring a telescope with an aperture of more than 20 m diameter when discussing reflecting telescopes of optical wavelengths including ultraviolet (UV), visible , and near infrared wavelengths. Among many planned capabilities, ELTs are planned to increase the chance of finding Earth-like planets around other stars. Telescopes for other wavelengths can be much bigger physically, such as the 100 meter (109 yards) aperture on the Green Bank Telescope for radio wavelengths, but different wavelengths like radio have different capabilities. These telescopes have a number of features in common, in particular the use of a segmented primary mirror (similar to the existing Keck telescopes ), and the use of high-order adaptive optics systems. See also the List of largest optical reflecting telescopes for other large finished telescopes. Although ELTs are large, they have smaller apertures than the aperture synthesis on many large optical interferometers. However, they have much more light collecting ability, along with other advantages. Contents 1 ELTs 2 Projects 3 See also 4 References 5 External links ELTs Top three ELTs that are funded with two smaller but completed large telescopes for comparison (background yellow). In the early 2000s, all three targeted completion in 2018, although this slipped to 2022 for one. Name Image aperture (m) Equiv. ap. area Area (m²) M1 Mirror segments Note Altitude European Extremely Large Telescope (E-ELT) Image credit ESO 39.3 39.3 978 m² 798 × 1.45 m hexagonal ( f /1) Site chosen: Cerro Armazones , Chile 3060m Thirty Meter Telescope (TMT) 30 30 655 m² 492 × 1.45 hexagonal ( f /1) Site chosen: Mauna Kea , Hawaii 4050 m Giant Magellan Telescope (GMT) 24.5 21.4 368m² 7 × 8.4 m circular ( f /0.71) Site chosen: Las Campanas , Chile ; 2 mirrors cast (2/7 M1), 1 polished 2516 m Large Binocular Telescope (LBT) 22.8* 11.7 111 m² 2 × 8.4 m circular Largest Binocular; largest non-segmented mirrors; First bino-light 2008 3221 m Gran Telescopio Canarias (GTC) 10.4 10.4 74 m² 36 × 1.9 m hexagonal Largest single mirror; Fully Operational 2009 2275 m *The LBT telescope baseline is via aperture synthesis. The Very Large Telescope is also of note, with 4 × 8.2 m, 4 × 1.8, and 1 × 2.61, all on separate mounts but in one building for Interferometry . Projects There were several telescopes in various stages of design or construction by the late 1990s and early 2000s, but only some developed into construction projects. Funded construction GMT : Giant Magellan Telescope E-ELT : European Extremely Large Telescope TMT : Thirty Meter Telescope Projects Some of these projects are completed, or merged into ongoing ELTs. GSMT : Giant Segmented Mirror Telescope , merged into TMT OWL : Overwhelmingly Large Telescope ;passed over in favor of E-ELT VLOT : Very Large Optical Telescope , merged into TMT LAT : Large Atacama Telescope EURO50 : European 50-metre Telescope ;merged into the E-ELT. LPT : Large Petal Telescope JELT : Japanese ELT Project . Japan joined the TMT project in 2008. CELT : California Extremely Large Telescope ; CELT became/merged into TMT project. See also List of largest optical reflecting telescopes Overwhelmingly Large Telescope Gran Telescopio Canarias References ^ See title of http://www.astro-opticon.org/fp5/skelcase.html and section 1 of http://www.aao.gov.au/instrum/ELT/ELTroadmap040917.pdf ^ http://www.guardian.co.uk/science/2006/aug/05/spaceexploration.universe Guardian August 2005 ^ a b Thirty Meter Telescope Construction Proposal . TMT Observatory Corporation. 2007-09-12. p. 29 . http://www.tmt.org/news/TMT-Construction%20Proposal-Public.pdf . Retrieved 2009-07-24 . ^ a b "Chapter 6: Optics" . GMT Conceptual Design Report . GMT Consortium. p.6–3 . http://www.gmto.org/codrfolder/GMT-ID-01467-Chapter_6_Optics.pdf . Retrieved 2008-04-02 . ^ a b Govert Schilling - Europe Downscales Monster Telescope to Save Money ( 14 June 2011) - Science Insider ^ http://www.eso.org/public/astronomy/teles-instr/e-elt_num.html External links Australian National Workshop on Extremely Large Telescopes (ELTs) The OPTICON ELT Working Group a Europe -wide research project The science case for Extremely Large Telescopes (ELTs) from the Royal Observatory, Edinburgh
2127 次阅读|0 个评论
更多...

Archiver|手机版|科学网 ( 京ICP备07017567号-12 )

GMT+8, 2024-6-2 20:13

Powered by ScienceNet.cn

Copyright © 2007- 中国科学报社

返回顶部