天文現象及活動

天文學入門 (理論課)


不少人有些錯覺,認為天文學內容高深,研究的都是些遙不可及的事物,其實最初人們留意日月的位置變化和出沒規律,為的只是農耕和預防河流氾濫等生活需要,但由此發展出日、月、年的時間觀念,成為人類生活的一個重要組成部份,與我們生活息息相關。本課程會運用生活化的例子,從星座和以星星辨認方向等開始講解天文學的內容,又會從近年傳媒熱衷報導的藍月、流星雨等帶領參加者正確認識各種天文現象。

◎理論課
●認識太陽系和太陽系各成員最新的科學發現
時間:2017.05.26(五) 19:00 ~ 22:00
●認識各種天文現象和解釋其成因
時間:2017.06.09(五) 19:00 ~ 22:00
●深空天體、認識人類在宇宙的位置
時間:2017.06.16(五) 19:00 ~ 22:00
●天文望遠鏡和各種天文儀器的介紹
時間:2017.06.23(五) 19:00 ~ 22:00
●太空探險、地外生命的探索
時間:2017.06.30(五) 19:00 ~ 22:00
地點:土瓜灣 馬頭涌50號 工人俱樂部

◎實習課
日期:2017.06.02(五)
時間:(待定)
地點:(待定)

收費課程,參加者必須報名

【訊息由張詠倫提供】

此活動由工聯會業餘進修中心主辦。

結合HAWC使用神經網絡技術於超高能量γ射線天文學


Seminar:- The Use of Neural Network Techniques in Very High Energy Gamma-Ray Astronomy with HAWC

The High Altitude Water-Cherenkov (HAWC) telescope is atypical in that it is able to detect high-energy particles (from 100 GeV to 100 TeV). HAWC is operating at 4,100 meters above level sea on the slopes of the Sierra Negra Volcano, Mexico and covers an area of 22,000sq.m. It works almost continuously (duty cycle > 90%) and observes ~2/3 of the sky every day. With a year and half of HAWC data, a sky map has resulted in the detection of ~40 sources, including the Crab nebula, Markarian 421 and Markarian 501. Unfortunately, an overwhelming majority of the events that arrive at the Earth, are triggered by cosmic rays; background noise suppression plays an important role in the data process. Thus, neural networks can be used for improving the separation between gamma rays and cosmic rays and get a better sensitivity. Finally, the speaker will discuss a new extension of the HAWC detector, known as outriggers. These additional detectors are in the process of being installed around the HAWC array and should also lead to an improvement in sensitivity of the instrument. 
 
時間:2017.05.26(五) 14:30
地點:香港大學 莊月明物理樓522室
講者:Tomás Capistrán Rojas (INAOE, Mexico)
語言:英語

免費會議,歡迎參加

#133

此活動由香港大學物理系主辦。

2016-17年度天文課程 (中學天文課程)


中學天文課程

日期:
2017.05:12(五),16(二),22(一),23(二),25(四),31(三)
2017.06:01(四),02(五),05(一),08(四),12(一),15(四),19(一),27(二)
時段:19:00 ~ 21:30

地點:荃灣荃錦公路101號 嗇色園可觀自然教育中心暨天文館

◎高中天文課程
對象: 中四至中六級物理科學生
◎日間/晚間天文活動
對象:中一至中六學生

名額:每節45

免費課程,惟不包括交通費,2016.10.03(一) 09:00起,參加者必須報名,2016.10.13(四) 13:00截止,抽籤選拔

【訊息由張詠倫提供】

此活動由可觀自然教育中心暨天文館主辦。

56年前今日美國甘迺迪總統宣佈十年內將太空人送上月球


1961年5月25日,美國總統約翰·甘迺迪在美國國會聯席會議上宣佈支持將太空人送上月球的太陽神計劃,並且計劃在10年內達成目標。

甘迺迪發表的演講如下:

……我相信這個民族能夠齊聚一心全力以赴達成這個目標,即在1970年以前,人類將乘坐太空船登陸月球並且安全返回。沒有任何一個太空項目能夠超越它對人類的影響,超越它對宇宙遠程空間探索的重大作用,也沒有一個太空項目開發如此困難而且花費如此昂貴……

【資料:維基百科】

圖:1961年5月25日,甘迺迪總統在國會上發表人類登月計劃的演講

The KMOS Redshift One Spectroscopic Survey


Seminar:- KROSS – The KMOS Redshift One Spectroscopic Survey

The speaker will present results from the KMOS Redshift One Spectroscopic Survey (KROSS). Using the K-band Multi-object Spectrograph (KMOS) at the Very Large Telescope (VLT), KROSS has gathered integral-field data for ~800 star-forming galaxies at a redshift z~1, when the universe was roughly half its current age and forming the bulk of its stars. KROSS aims to study the spatially-resolved dynamics, star formation properties and metallicities of those middle-aged galaxies. First, the speaker will quantify the dynamical state of the galaxies, thus constraining their likely mass growth mechanisms (e.g. mergers versus secular evolution), painting a picture of galaxies that are both gas-rich and highly turbulent. Second, he will describe the properties of the galaxies departing from the star formation main sequence, revealing that star formation in highly star-forming galaxies is also more concentrated and arises from lower metallicity gas. Third, he will present the observed and baryonic Tully-Fisher (luminosity – rotation velocity) relation, thus constraining the mass-to-light ratios and luminous+dark masses of the galaxies. Last, by degrading and analogously analysing integral-field data of hundreds of local galaxies from the Sydney-AAO Multi-object Integral-field Spectrograph (SAMI) survey, the speaker will derive a comparison Tully-Fisher relation at z=0, thus constraining the luminous+dark mass growth of disk galaxies over the last 7 billions years. This unique comparison also highlights that the systematic effects associated with sample selection and analysis methods are as large as the effects expected from cosmological evolution, and thus that most other results can safely be ignored. 
 
時間:2017.05.25(三) 14:30
地點:香港大學 莊月明物理樓522室
講者:Prof. Martin Bureau (University of Oxford)
語言:英語

免費會議,歡迎參加

#133

此活動由香港大學物理系主辦。

天文課程:天文望遠鏡製作(講座)


光學望遠鏡的原理及構造、反射式望遠鏡的磨製和測試、赤道式天文望遠鏡腳座和附件的製作與調校等。在實習期間,學員將會學習製造一具12厘米口徑的反射式天文望遠鏡。

◎講座
時間:
●2017.05.25(四) 19:00 ~ 20:00
●2017.06.01(四) 19:00 ~ 20:00
●2017.06.08(四) 19:00 ~ 20:00
●2017.06.15(四) 19:00 ~ 20:00
●2017.06.22(四) 19:00 ~ 20:00
地點:香港太空館演講廳

◎實習
時間:
●2017.05.28(日) 10:00 ~ 12:30 或 14:00 ~ 16:30
●2017.06.04(日) 10:00 ~ 12:30 或 14:00 ~ 16:30
●2017.06.11(日) 10:00 ~ 12:30 或 14:00 ~ 16:30
●2017.06.18(日) 10:00 ~ 12:30 或 14:00 ~ 16:30
●2017.06.25(日) 10:00 ~ 12:30 或 14:00 ~ 16:30
●2017.07.02(日) 10:00 ~ 12:30 或 14:00 ~ 16:30
●2017.07.23(日) 10:00 ~ 12:30 或 14:00 ~ 16:30
地點:香港太空館活動室

講者:
●黃隆 (坐井會資深會員)
●鄭家輝 (坐井會資深會員)
●黃永藍 (香港天文論壇版主)
導師:蔡建華 (坐井會資深會員)
名額:30
對象:15歲或以上

收費課程,2017.04.01起,參加者必須報名,先到先得

此活動由香港太空館主辦。

三維觀測星系中分子氣體 – 從廣域動力學到超大質量黑洞


Seminar:- 3D Observations of Molecular Gas in Galaxies – From Global Dynamics to Supermassive Black Holes

The speaker will first briefly review the molecular gas content of early-type galaxies. He will show not only that they unexpectedly harbour much cold gas, but also that it is the best tracer of the circular velocity, thus allowing accurate spatially-resolved dynamical mass measurements in galaxies across the Hubble sequence. Second, the speaker will explore the use of molecular gas for studies of the Tully-Fisher (luminosity-rotational velocity) relation of galaxies to high redshifts. He will highlight the work done to establish local (z=0) benchmarks and will discuss the challenges posed by systematic effects when comparing nearby and distant galaxies. Third, he will demonstrate that CO can be used to easily and accurately measure the mass of the supermassive black holes lurking at galaxy centres. He will discuss substantial ongoing efforts to do this and present many spectacular new ALMA measurements, that open the way to literally hundreds of measurements across the Hubble sequence with a unique method. The speaker will also hint at how the same data allow to study the spatially-resolved properties of giant molecular cloud populations in non-local galaxies for the first time, providing a new tool to understand and contrast the star formation efficiency of galaxies on cloud scale. 
 
時間:2017.05.24(三) 14:30
地點:香港大學 莊月明物理樓522室
講者:Prof. Martin Bureau (University of Oxford)
語言:英語

免費會議,歡迎參加

#133

此活動由香港大學物理系主辦。

星空零距離 – 北京內蒙古觀星團


想體驗大漠風情、喺草原睇銀河嘅你點可以錯過呀!

日期:2017.05.24(三) – 2017.06.03(六)
地點:北京及內蒙古
對象:香港中文大學學生
名額:20

收費活動,參加者必須報名,2017.04.10截止

#87

此活動由香港中文大學天文學會主辦。

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