Dec 09

土星合木星21/12/2020

天文匯將於2020年12月18日晚上8時與天祥攝影器材舉辦介紹如何拍攝是次天象的網上講座,詳情請瀏覽天文匯網頁天文匯facebook

2020年12月21日黃昏,用望遠鏡放大60倍的情況

概覽

「合」是指兩個或以上的天體從地球上看,在天空接近的一種天象,合的種類繁多,例如

「行星合月」、「行星合行星」、「行星合小行星」、「行星合恆星」等,當中以「行星合月」出現的機會最高,例如「金星合月」、「木星合月」等,而「行星合行星」的機會就較低。

2020年12月20-22日,將會出現罕有的「土星合木星」現象。

土星合木星的罕有程度

  • 木星及土星的公轉週期分別是11.86及29.46年,前者是後者的0.4倍,不難發現木星每公轉5次,土星就公轉2次的週期,因此從地球上看,它們大約每20年就在天空中兩星相合一次,考慮到行星公轉平面傾角等因素,每60年就有一次比較接近的相合;每400年就有一次很接近的相合。
  • 對上一次的土星合木星發生在2000年12月,而下一次就發生在2040年10月,前後三次以2020年的一次最接近。
  • 如今次般接近的土星合木星,下次將發生在2080年3月。
2000年12月的土星合木星,相片中央最光亮的是木星,右方較暗的是土星,上方是七姊妹星團。Nikon FM2, Kodak E200, 天文匯 彭栩怡 攝於大嶼山水口村

有關網上流傳的「木星掩土星」現象

從更長線角度考慮,大概每兩萬年從地球看就會出現「木星掩土星」極之罕有的天象,由於目前在世的朋友沒有機會觀賞這天象,因此筆者傾向略過不提,唯一要留意行星與太陽距離的排序,從地球上看土星離地球較木星更遠,因此只會有「木星掩土星」而不會有「土星掩木星」的現象。

是次現象簡介

日期:2020年12月17日至26日,最接近:12月21日星期一

觀測時間及地點

想欣賞是次現象的朋友,可於當日黃昏開始留意,直至木星及土星西落為止。

天黑時木星及土星已離西南偏西地平線頗近,因此筆者建議想觀賞是次天象的朋友,選擇抽西至西南方只有少量遮擋的地點。

觀賞行星現象不一定要走到偏遠的地方,以下是數個可考慮的地點:

  • 香港島:西至西南部一帶如鴨脷洲、香港仔、薄扶林、堅尼地城一帶;
  • 九龍:西九龍沿海一帶
  • 新界:青山公路荃灣至屯間一帶海邊、機場、北大嶼山公路沿途一帶、大澳、船灣淡水湖、長洲,或
  • 巿區任何西至西南方視野較開揚的位置

觀賞所需設備

如只用肉眼觀賞,會見到兩顆行星非常接近,近乎變成一顆星;有雙筒望遠鏡(7倍至約20倍)的朋友亦可使用它觀賞;一般小型天文望遠鏡更會見到木星表面的雲帶及土星的光環,而兩者在同一視場內,非常難得。

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Sep 28

一齊整座食得嘅望遠鏡呀!

黎緊中秋長假期,陰陰沈沈無月睇,不如一齊整座食得嘅望遠鏡呀!又睇得,又食得,又用得(應該),真係一次過滿足哂3個願望呀!https://www.youtube.com/watch?v=Mpj3V34iK2E

Check out this video of telescope production with chocolate! See if you are skillful enough to make one! https://www.youtube.com/watch?v=Mpj3V34iK2E

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Sep 18

金星大氣中發現有磷化氫(PH3),引起左天文界懷疑…

之前有報告話係金星大氣中發現有磷化氫(PH3)。係地球上嘅自然情況下,磷如果要以化合物型態出現嘅話,通常會係以氧化物型式出現。今次嘅發現引起左天文界懷疑:金星尼個「煉獄」其實係咪有班「隱世」微生物居住緊呢?
大家對於金星可能有生命點睇法?不如俾吓意見呀!

想睇清楚啲先?可以到以下連結睇吓架:
https://www.nature.com/articles/s41550-020-1174-4

The discovery of phosphine (PH3), a phosphours compound which should normally exist in oxidised form, on Venus hit the Astronomical World. Heated discussion on whether live exists on Venus was also brought forward.
What do you think about this discovery? Let‘s throw your ideas.

Wanna know more? Check it out from this link:
https://www.nature.com/articles/s41550-020-1174-4

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Jul 08

如果你係去太空,帶漏左SD卡…

去旅行帶漏SD卡…唉…無辦法啦,唯有俾人劏去遊客區買啦!
但係,如果你係去太空,帶漏左SD卡,邊度搵個遊客區俾你買番張卡呀?
有位去左國際太空站嘅太空人就發現自己大頭蝦,唔記得放張SD卡落去部action cam度。咁點算?咪唯有開咪搵美國太空總署幫手囉!咁又好彩太空站上面有後備,用住部DSLR頂住先啦!😂
https://www.sciencealert.com/nasa-spacewalk-iss-forgot-gopr…

Forgot your SD card on your trip? No problem! Get one at your nearest store!
But what if you are out of this world when something like this happen? Well, this is exactly what flight engineer Drew Feustel was facing when he had arrived at ISS. He was trying to capture himself doing spacewalk outside the ISS with his action camera, when he saw that the camera was flashing an abnormal red light. He called NASA for help, and was told that he has forgotten his SD card.
And the solution?
Pick up the DSLR in ISS for filming!
https://www.sciencealert.com/nasa-spacewalk-iss-forgot-gopr…

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Jul 07

三十年前,哈勃太空望遠鏡成為人類係宇宙嘅眼睛…

三十年前,哈勃太空望遠鏡成為人類係宇宙嘅眼睛,為我哋帶黎宇宙鮮為人知嘅一面。美國太空總署將哈勃太空望遠鏡送番黎地球嘅精彩照片輯錄成片,請大家細心欣賞:https://svs.gsfc.nasa.gov/13603

30 years ago, Hubble Space Telescope became the eyes of Earthlings in our mysterious Universe. In honour of Hubble’s hard work, NASA has made a video out of it’s masterpieces. Enjoy!https://svs.gsfc.nasa.gov/13603

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Jul 05

熱辣辣,可以匿埋係啲涼浸浸嘅地方就好啦!歐洲太空總署為大家送上透心涼嘅科羅廖夫隕石坑!

熱辣辣,可以匿埋係啲涼浸浸嘅地方就好啦!歐洲太空總署為大家送上透心涼嘅科羅廖夫隕石坑!近睇係個溜冰場,遠睇係舊綿花糖,而且仲冰涼又舒服(應該係啩),真係一次過滿足哂3個願望呀!想了解多啲尼個隕石坑嘅資料可以參考歐洲太空總署嘅網頁:https://www.esa.int/Science_Exploration/Space_Science/Mars_Express/Mars_Express_gets_festive_A_winter_wonderland_on_Mars仲可以跟住探測船一齊飛過尼個隕石坑添喎!https://www.youtube.com/watch?v=z3fFOCPgNJk&feature=youtu.be

What’s better than stuffing yourself into a nice cool little room, when it’s hot and stuffy outside! Check out this new festive favour especially for you on Mars, presented by The European Space Agency (ESA)! As a meteor crater, Korolev Crater is located in the Northern hemisphere on Mars, and has a volume comparable to the Great Bear Lake in Canada. This crater was named after Sergi Korolev, the head Soviet rocket engineer in the 1950s and 1960s.This crater has a permanent layer of ice coverage, making it a gigantic marshmallow when photographed from a distance.Check out more details of this crater from the website of ESA:https://www.esa.int/Science_Exploration/Space_Science/Mars_Express/Mars_Express_gets_festive_A_winter_wonderland_on_MarsVideo also available here:https://www.youtube.com/watch?v=z3fFOCPgNJk&feature=youtu.be

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Jul 02

哇,2/7凌晨係關東上空出現火流星呀!

哇,2/7凌晨係關東上空出現火流星呀!大家可以click入以下連結,有埋片睇添呀!https://asahichinese-f.com/society/13509033

A fireball was spotted in the Japan’s night sky on 2 Jul, local time. Check out the video from the following link:https://asahichinese-f.com/society/13509033

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Jun 18

美國太空總署送份「生日禮物」俾大家!

生日快樂呀!美國太空總署送份「生日禮物」俾大家!大家只要click落下面條連結,揀選番自己生日日期,就可以睇到哈勃太空望遠鏡係大家生日當日睇到嘅星空架啦!
祝各位已過生日、今日生日同埋就黎生日嘅朋友生日快樂!🥳
https://www.nasa.gov/…/goddard/what-did-hubble-see-on-your-…

Surprising birthday gift from NASA! Check out what Hubble Space Telescope has seen on your birthday by inputting your birthday to the link below.
Wish everybody a happy birthday! 🥳
https://www.nasa.gov/…/goddard/what-did-hubble-see-on-your-…

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May 20

為紀念Earth Observatory 20年,地球日50周年…

為左紀念Earth Observatory係太空努力工作20年,以及地球日50周年,美國太空總署係4月時舉辦左一個相片比賽。不過尼個比賽唔係俾「地球人」參加,而係俾「外太空」朋友參加架!想知道比賽結果同欣賞吓尼啲外太空相,請click入以下連結細心欣賞啦!
https://earthobservatory.nasa.gov/…/v…/tournament-earth-2020

To celebrate the 20th anniversary of Earth Observatory, as well as 50th anniversary of Earth Day, NASA held a photo contest in April, and this contest is an absolutely our-of-this-world one!
Check out all the stunning outside-Earth’s photos here:
https://earthobservatory.nasa.gov/…/v…/tournament-earth-2020

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May 18

門口保安攝錄機有驚喜?!

係門口嘅保安攝錄機拍攝到屋企人出出入入好正常啦!但係如果半夜三更同你影低左粒火流星都咪話唔驚喜呀!南卡羅萊納州一個家庭嘅保安攝錄機就係當地時間上星期四半夜為佢哋帶黎尼個驚喜啦!
美國太空總署相信尼粒火流星係源自寶瓶座流星雨。想睇吓尼粒火流星有幾勁?入去尼條連結睇吓啦!
https://www.khon2.com/…/video-meteor-caught-on-doorbell-c…/…

Family doorbell video camera caught sight of a meteor (or I should say a fireball) on last Thursday around mid-night local time at South Carolina. NASA believes that this meteor originates from Eta Aquarids Meteor Shower, which in turn is the debris from the famous Halley’s Comet.
Check out the link below for the video of this “unusual” door camera has recorded.
https://www.khon2.com/…/video-meteor-caught-on-doorbell-c…/…

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