夏季大三角

 <夏季三角>

是巨大三角尺
規劃著渡橋的尺寸

是彭羅斯三角形
旅人裸足涉水，遊盪迷返

是可口的三明治
誘惑的鮮奶油大量從中滑出

是仙崖義梵的三角形
永夜裡我對著掛軸參悟為達那圓

是閃耀的三角鐵
風輕吹便敲奏出音響

<Summer Triangle>

A giant triangle

Planning the size of the bridge

It is the Penrose triangle

Travelers dabble in the water with bare feet, wandering

It's a delicious sandwich

Temptation of whipped cream slips out of it

It is the triangle of 仙厓義梵

In the eternal night, I comprehend to the hanging scroll trying to reach the Circle

A shining triangle

The wind blows and the sound is played

<星座>

夜空下我仰躺著伸長雙臂
在恆星與恆星間以手指
翻出各種厲害的花繩樣式

 

<Constellation>

Under the night sky I lay on my back and stretched my arms
between stars my fingers

pull out all kinds of powerful Cat's cradle styles

 晚上九點左右，於小觀音山頭的夏季大三角（牛郎、織女、天津四）。

The rainy season was coming to an end, finally.

梅雨季差不多要過去了，天氣逐漸好轉，傍晚看天色不錯，整理好器材便上鞍部納涼，山上夜空很乾淨，薄雲約在七百公尺以下的盆地上空。

九點左右夏季大三角已經懸於小觀音山上空，停車場四周的密叢中仍有不少螢火蟲穿梭（一直到午夜都很熱鬧），偶而會飛近望遠鏡環繞。

這晚再次將北美洲星雲仔細端詳近一小時做素描，可以看見佛羅里達那一角了，上次並無法看見，今晚透明度較佳。（在這裡看HII區使用6"牛頓會更合適。）
後來又看了NGC 6210俗稱為烏龜的一個行星狀星雲（0.3'x0.2'），是因為這幾天閱讀“Spectral Atlas"這本光譜書時（非常推薦這本書）裡面有介紹到它的光譜，它雖然激發等級在三、接近四，比土星狀星雲的E8與指環M57星雲的E10都弱，但 OIII的發射線也非常強烈。以Pentax 105SDHF搭配 TV的3-6 zoom的3mm端即233倍、LP2 濾鏡非常明顯，即使出瞳徑僅剩 0.45mm左右仍很明亮，於是畫了鞍部第283個深空素描。但是 233倍率仍不足以清楚看見輪廓，這些小行星狀星雲還是使用8" 鏡拉高倍率至300倍以上才比較夠觀察外形。


整夜濕度不高氣溫宜人，午夜後銀河過子午線肉眼隱約可見，無風，天階涼如水。

finally the rainy season came to an end, and the weather was gradually improving. 

In the evening of 27 Jun, the sky looked good .  so  I went up to the saddle of 大屯山 after dinner to enjoy the coolness.

Around 9:00 PM, the summer triangle was already hanging over 小觀音 Mountain, and there are still many fireflies in the dense bushes around the parking lot (it is very lively until midnight), and occasionally fly close to the telescope to surround.

This night I carefully studied the North American Nebula(NGC7000) for nearly an hour and made a sketch. now I can see  Florida , the corner where I couldn't see last time, tonight the transparency is far better. (but It would be more appropriate to use a 6" Newton to see the HII zone under the bortle 5 nightsky like here.)

Later, I saw a planetary nebula (0.3'x0.2')  NGC6210 —— commonly known as the ‘turtle’ , I thought it is interesting when I read the "Spectral Atlas” and saw it in the book. although the excitation class of NGC6210 is in the third or close to the fourth, is weaker than the Saturn Nebula(E8) and the Ring Nebula(M57, E10), but the emission of [OIII] from NGC6210 is also very strong. 

I used  Pentax 105SDHF with TeleVue 3mm eyepiece (end of 3-6 zoom)  to get 233x , the object was still very obvious via LP2 filter(OIII+Hb) even if the exit pupil diameter was only about 0.45mm  , then I drew a sketch for it. However, the 233x magnification is still not enough to clearly see the outline, and for these small nebulae,I think that people should use an 8" mirror to increase the magnification to more than 300x to observe the outline.

The humidity was not high and the temperature was pleasant all night. After midnight, the Milky Way was faintly visible to the naked eye,  the sky was as cool as water.

大熊座的北斗已西垂，而小熊的斗杓則剛繞過子午線

近午夜銀河已快達到天頂

SiriL background extraction

NGC7000 北美洲星雲

  午夜時分仙女座與仙后座皆已升起。

今晚的透明度相當不錯，南方台北市區方向樹梢的星子清晰可見，二十五秒的銀河很明顯。

使用SiriL做背景校正

午夜螢火蟲仍不少，也不時飛近望遠鏡。

NGC 6210

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*很可惜的停車場入口的樹叢被裁短了，原來的樹叢正好可以遮擋住巴拉卡公路上自竹子湖方向上來的車子過彎時照射向停車場內的車燈。







*

"SPECTRAL ATLAS FOR AMATEUR ASTRONOMERS"

蠻喜歡這本的，它有一百張不同天體的光譜，並且針對各種天體立章節來說明為何光譜看起來會這樣，以及有哪些有意義有趣的特徵值得注意，可以從光譜獲得什麼有關這天體的知識等，很淺顯易懂。
但這不是一本教你如何拍攝光譜的書噢。