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 1 
 於: 2024-03-28 19:21:52 
發表者 peter - 最新文章 由 peter
https://technews.tw/2024/03/28/polarized-light-event-horizon-telescope-milky-way-black-hole-eht-sgr-a/ 

銀河系超大質量黑洞偏振光結構與 M87* 驚人相似

銀河系超大質量黑洞人馬座 A* 又有一張新形象照,近日事件視界望遠鏡釋出人馬座 A* 的偏振光影像,展示從黑洞邊緣螺旋上升的強大磁場,研究表明其結構與 M87 星系中心更巨大的超大質量黑洞驚人相似。

2019 年,事件視界望遠鏡(EHT)發布人類史上第一張黑洞照片,拍攝對象為 M87 星系中心的超大質量黑洞 M87*,證實愛因斯坦廣義相對論對黑洞的預測。

2022 年,事件視界望遠鏡再公布銀河系中心 Sgr A* 第一張黑洞照片,雖然銀河系中心的超大質量黑洞人馬座 A*(Sgr A*)比 M87* 黑洞小 1,500 多倍,但觀測結果顯示無論尺寸、質量差異多麼巨大,兩者看起來都非常相似。

科學家於是更想知道兩者除了外表是否還有其他共同特徵,決定在偏振光下研究 Sgr A*。

透過對黑洞附近熾熱氣體的偏振光進行成像,可以直接推斷黑洞賴以生存的氣體物質中磁場結構和強度,而最新影像也說明了結果:Sgr A* 與 M87* 黑洞具有驚人相似的極化磁場結構,科學家了解到強大有序的磁場對於黑洞如何與周圍氣體、過熱物質相互作用至關重要。

雖然銀河系與 M87 星系截然不同,但星系中心的超大質量黑洞控制供應、發射噴流物理過程可能只是普遍特徵。

 2 
 於: 2024-03-28 19:13:00 
發表者 peter - 最新文章 由 peter
2024高雄市天文學會日月潭親子天文營
一、活動時間:2024年6月1日(週六)~ 6月2日(週日)(合計二天一夜)
二、活動地點:南投日月潭、車埕、埔里地區
三、活動行程:
<<6/01>> 07:30追星專車(文化中心 - 港和國小 ) ---08:00港和國小(數位式星象儀) ---08:40啟程 ---09:50東山休息站 ---11:00車埕木業展示館   ---12:00美味午餐 ---13:30慈恩塔 ---14:30玄光寺 ---15:30向山遊客中心 ---17:00日月潭教師會館(分配寢室、放置行李) ---18:00美味晚餐  --- 20:00日月潭星空之美  ---22:00盥洗與晚安曲
<<6/02>> 07:00早安,日月潭 --- 08:00營養早餐 ---09:00涵碧步道 
---10:00天文賓果 ---11:00伊達邵老街 ---12:00美味午餐 ---13:30日月老茶廠 ---14:30埔里酒廠 ---15:30回程 ---18:00安抵高雄,期待再相會!       
個人攜帶物品:1.雙筒望遠鏡   2.輕便雨衣  3.防曬用品、防蚊藥物、個人零食、筆  4.換洗衣物、盥洗用品   5.私人藥品(如:暈車藥、感冒藥等)及健保卡(必帶) 
四、活動費用:(四人房型)3700元;(二人房型)4200 【會員減收100元】
(含手冊、保險費、食宿、車資等)
五、報名事項:
(1)報名日期:即日起至5月1日(或額滿)截止。
(2)報名方式:請先至本會FB粉絲頁(https://www.facebook.com/kh.astronomy.society)私訊留言,經工作人員回覆確認名額,再進行匯款。
(3)匯款帳號:元大銀行(戶名:高雄市天文學會、帳號:21492000025581)
六、辦理單位:高雄市天文學會、高雄市港和國小
( 本會親子天文營活動, 歡迎分享 )

 3 
 於: 2024-03-28 19:06:07 
發表者 peter - 最新文章 由 peter
合歡山停車場  確定4月4日正式收費營運,機車每次20元,紅、黃牌大型重型機車比照汽車收費,平日半小時25元,假日半小時30元,單日最高300元,停車前15分鐘免費,讓想上廁所的遊客可安心暫停。

3座停車場共有151個小型車停車格,昆陽47格、武嶺54格、合歡山莊50格,共47個機車格,另武嶺停車場有紅黃牌大型重型機車格15格。

普通機車停車格每次收費20元,紅、黃牌大型重型機車比照汽車收費,平日(周一至周四)半小時25元,假日(周五至周日)半小時30元,不分平假日單日最高300元,開辦後將視狀況,再檢討是否要調高收費或實施差別費率。

南投分署提醒,目前鳶峰往上至昆陽下方的玉山杜鵑陸續綻放,合歡山杜鵑花季將於4月13日至6月16日登場,花季期間假日上午6時至11時,合歡山公路翠峰至大禹嶺(台14甲線18K~41K)實施高乘載及流量管制,大貨車及未搭乘3人以上的小客車禁止通行。

 4 
 於: 2024-03-28 17:47:54 
發表者 peter - 最新文章 由 peter
https://www.cloudynights.com/topic/71337-where-to-find-figure-xp-software-for-download/

https://www.cloudynights.com/topic/582091-figure-xp-user-manual-anywhere/


 5 
 於: 2024-03-28 17:44:44 
發表者 peter - 最新文章 由 peter
Figure XP
https://familystar.org.tw/index.php?option=com_smf&Itemid=45&topic=38995.0

Making and Testing a Telescope Mirror

Millies-Lacroix Mirror Plot, shows the effects of polishing the mirror more (Miller, 1979)


Millies-Lacroix graph
https://www.cloudynights.com/topic/455886-interpreting-foucault-for-figuring/


 6 
 於: 2024-03-28 14:05:16 
發表者 peter - 最新文章 由 peter
12p 螺旋狀 國外拍到了

 7 
 於: 2024-03-28 10:42:44 
發表者 peter - 最新文章 由 peter
牧師分享

https://www.facebook.com/photo/?fbid=7655733871113679&set=pcb.7408864112503688&locale=zh_CN

Millies-Lacroix plot
https://familystar.org.tw/index.php?option=com_smf&Itemid=45&topic=38994.0


millies-lacroix analysis


 

 8 
 於: 2024-03-28 10:32:44 
發表者 peter - 最新文章 由 peter
一個未知的發現

https://www.astrobin.com/zyam76/


ATLAS ― 超新星遺跡 G209.8-8.2 在獵戶座

*

比兩個連絡電信鏡爆炸的320小時更多
此外,數百個小時的研究、分析、計劃和圖像編輯,以獲得一個顯著的發現和一張獨一無二的照片。… 查看更多

 9 
 於: 2024-03-27 22:13:32 
發表者 peter - 最新文章 由 peter
FROM FB

COLOUR MOON TUTORIAL/GUIDE!
A few people have asked how I get the colour in my Moon images so I have written out this very basic guide that might help.
Its not my full process, but should be enough to get you started and experimenting.


RECORDING AND STACKING

    Record a video of the Moon in RAW. 1 to 4 min should be more than enough.

    Copy the .avi from the SeeStar to your computer.

    - Load the .avi into Auttostakkert!4 (https://www.autostakkert.com/)
    Image Stabilization = Planet (COG)
    Quality Estimator = Automatic
    Colour Menu > Force Bayer GRBG

    Press the "Analyse" button.
    AS!4 will review every video frame, rank them from best to worst quality, and display the results on a graph.

    In the window that has the image of the Moon in it, choose an AP size (I usually pick 104), select "Replace" and "Multi-Scale," then click the "Place AP Grid" button. This will put a whole bunch of boxes on the Moon.
    Check to ensure they cover the whole of the Moon but aren't selecting any of the black area around the outside of the Moon.
    If some black is selected, increase the "Min Bright" option until just the Moon has APs on it.
    If not enough of the Moon is covered (especially around the terminator), decrease the "Min Bright" option.

    Look at the graph and decide how many frames you want to stack. You only want to use the highest quality frames, so sometimes "less is more."
    I usually only stack the best 50%. To do this, I look for where the green line meets the 50% axis on the graph, hold down "ctrl," and left-click on the graph. This will automatically fill the first box in the "Frame percentage to stack" box.

    Choose your file format.

    Tick "RGB Align" and "Save in Folders." The "Sharpened" option will output a 2nd image with sharpening applied.

    Drizzle 3.0x works well for the SeeStar. The Optics/Sensor combo is slightly undersampled, so Drizzle can help to recover that detail. The more frames, the better it will work (but don't include low quality frames just to get the numbers up), and you can always downsample the image after to return it to the original size. It might not always work correctly, so if you find a lot of aliasing or blocky artifacts, drop it down to 1.5x or turn it off completely.

    Press the "Stack" button and let AS!4 do its thing. Once done, there will be a new folder in the same dir as the .avi that contains the stacked image.

PROCESSING
I use "AstroSurface" (http://astrosurface.com/) for this part.

    Load the image into AstroSurface. "Files > Open File" or "Ctrl-O." Browse to where AS!4 saved the stacked image, select it, and choose open.

    The first thing I usually do is "Crop" the image. At the top of the AstroSurface window is a button labeled "Crop." Select it, then draw a box around what you want to keep. Crop out any 100% black around the border that may have been added during stacking.

    The next step is to sharpen the image. These are the "Orange" buttons at the top.
    There are 5 options to choose from. What option you choose will be down to personal preference as they all have slightly different results, so play around and find the one you like the look of the best.
    I like to use V-Cittert or R-Lucy.

    I won't go into details on how to use these tools, but the AstroSurface has some videos. Wavelets Wiener - http://astrosurface.com/manuels/waveletswiener.mp4 and V-Cittert - http://astrosurface.com/manuels/vancittert.mp4. The others all work similarly, so have a play.

    Once you are happy with the sharpening, the next step is to get that colour. I start by doing a "White Balance." It's one of the blue buttons and is labeled "W-Balance." Click the "Auto" button and press OK (This is why we cropped out the 100% black earlier).

    Next, click the "Saturation" button (also blue). Draw a small box over the Moon. Crank the "Color Noise prefilter" up to 5 and set a saturation value. I do this in a few small steps rather than a single one, usually around 50. It will be subtle, but the colour is there. Press the "Do All" button and then "OK".

    Your image may have a blue tint to it again, so do another Auto White Balance.

    Repeat the saturation. 50 again should be ok. This time, you don't need to use the "Color Noise prefilter."

    Do another white balance if you feel it's needed.

    Once you're happy with the results, choose "File > Save As". If you click "Save," it will OVERWRITE your stacked image. Not ideal if you want to start the processing again, as you will need to start again from AS!4.

    Bring into Photoshop, GIMP, or your editor of choice to make the final adjustments.

Hope this helps some people. Feel free to ask questions in the comments. I'll do my best to answer.

https://www.facebook.com/photo/?fbid=10168324756015164&set=gm.321854700626819&idorvanity=201735739305383

 10 
 於: 2024-03-27 22:09:09 
發表者 peter - 最新文章 由 peter
https://www.astropix.com/

https://www.astropix.com/html/equipment/canon_one_to_one_pixel_resolution.html

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