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大瘋起嘻
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« 回覆文章 #15 於: 2008-01-02 22:04:57 » |
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謝謝啦!! 這角度不錯
洪大哥怎樣擠進去的
慶祝爸媽從花蓮北上跨年 所以趕17:50在交管前開車停入北醫Parking 全家再轉兩隻小黃入信義威秀 取國家寶藏閱古籍秘辛後 進Neo19之上閤屋吃到飽 下屋左後轉入巷直走50米 世貿二館後方東機車Parking 安坐摩托墊上倒數按快門 散場後散步回北醫取車 信安巷內小塞三刻鐘後 改道吳興街小巷從提早解管的松仁轉信五 沿信義快遁二高衝回新莊02:20AM上床 翌日慶祝元旦上班八小時 真是細膩的規劃 明年要學起來 |
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Ja
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« 回覆文章 #16 於: 2008-01-02 23:44:03 » |
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各位:
Happy New Year!!!
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Hung,Jim
衛星
文章: 62
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« 回覆文章 #17 於: 2008-01-03 00:17:47 » |
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嗯嗯~~洪大哥也住新莊喔~是在輔大附近嗎?前幾年去家附近的一家AGFA相館沖照片的時候有看過店家洗獅子座流星雨~稍微問了一下店家~說照片是附近一位在天文館工作的同好送來洗的~不知道是不是洪大哥呢?
嗯~您也住新莊喔~我的確是在輔大附近耶!AGFA相館店家洗獅子座流星雨我送去沖的~咱們還是鄰居呢? 您住建安街附近嗎? |
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Skyray
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« 回覆文章 #18 於: 2008-01-03 01:13:04 » |
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我住建安街上的宏盛頂好社區，以前因為在學校參加攝影社，所以還蠻常去那家AGFA洗照片的，跟老闆還算認識
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觀星之樂~貴在分享
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lightline77
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« 回覆文章 #19 於: 2008-01-03 01:50:28 » |
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謝謝啦!! 這角度不錯
洪大哥怎樣擠進去的
慶祝爸媽從花蓮北上跨年 所以趕17:50在交管前開車停入北醫Parking 全家再轉兩隻小黃入信義威秀 取國家寶藏閱古籍秘辛後 進Neo19之上閤屋吃到飽 下屋左後轉入巷直走50米 世貿二館後方東機車Parking 安坐摩托墊上倒數按快門 散場後散步回北醫取車 信安巷內小塞三刻鐘後 改道吳興街小巷從提早解管的松仁轉信五 沿信義快遁二高衝回新莊02:20AM上床 翌日慶祝元旦上班八小時 真是細膩的規劃 明年要學起來 好像未來"不可能的任務 4 "情節  |
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JimHung
衛星
文章: 73
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« 回覆文章 #20 於: 2008-01-03 10:31:37 » |
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我住建安街上的宏盛頂好社區，以前因為在學校參加攝影社，所以還蠻常去那家AGFA洗照片的，跟老闆還算認識
厝邊您好！ 好巧我住建安街上的宏盛臺北華府一期(建亨眼鏡對面那家眼鏡行上方啦)，以前因為常用FM2+FC-50打松山和CKS之鐵鳥群，常去那家AGFA洗照片，跟老闆還算熟, 改用DSLR後便較罕去煩他了，附近之傻瓜麵和鐵板燒反較常去... 搞不好常在路上擦身卻渾然不覺有星友而過?! ***天上的星星 為何像人群一般的擁擠呢？ 地上的人們 為何又像天上的星星一樣的疏遠？ (羅青 詩 / 齊豫 唱)*** |
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Skyray
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« 回覆文章 #21 於: 2008-01-03 11:38:50 » |
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呵呵～真的是鄰居耶～打鐵鳥～去年有去松山打過～不過聽說民航局把10號跑到頭前面的土地都買下來了～以後要感受飛機低空飛過的景點～又少了一個～CKS的話比較不知道可以打鐵鳥的點在哪～只有以前當兵的時候跑戰備會去CKS附近逛逛～就可以看到一堆飛機～會喜歡看飛機大概是國中以後～真正會去看機型是在松山工農唸書的時候～整天都有飛機飛過學校上面～同時期也加入天文社～看飛機和看星星這兩樣跟天空有關的興趣就一直維持到現在～不過比起當學生的時候～現在器材有了～但是能夠專心玩興趣的時間反而少了～最後貼一下去年在松山拍的： http://www.wretch.cc/album/album.php?id=skyray1492&book=21 |
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觀星之樂~貴在分享
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技安
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« 回覆文章 #23 於: 2008-01-03 13:47:02 » |
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大家新年快樂ㄚ！心想事成ㄛ！......... |
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Skyray
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« 回覆文章 #25 於: 2008-01-03 20:20:52 » |
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已記錄
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觀星之樂~貴在分享
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Hung,Jim
衛星
文章: 62
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« 回覆文章 #27 於: 2008-01-03 20:52:14 » |
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不過 不知道 如何在移動的飛機上追蹤 畢竟飛機相當快速 ..
http://www.sofia.usra.edu/Sofia/faqs/sofia_faqs.html#T4Q: What is the maximum time the telescope can be pointed at an object? The object would eventually be out of the field of view, even if you could adjust the telescope.
A: A few hours is generally the maximum. Objects make arcs through the sky due to the Earth's rotation. The motion of the airplane also adds or subtracts at bit from this apparent object motion. So, while observing a target, the telescope appears to be following an arc in the sky, although it is actually staying fixed dead-on to a distant point in deep space that just appears to me moving. All that time, the airplane body slowly swings in its own arc relative to the ground to keep the target at a right angle to the airplane, so that the telescope can keep peering out. Typically, after a few hours, the object has either set too near the horizon, or risen too near the zenith to track, or else the airplane has been flying so long in one direction, it is getting too far from home. At this point, another object, located in a different part of the sky is turned to. These flights are carefully planned in advanced. [/color] Q:How does SOFIA get clear pictures? Even at 12km there would still be a lot of [airplane] turbulence and the pictures wouldn't be very clear.
A: At visible wavelengths, it is neither atmospheric turbulence, the refractive action of mobile air cells which push light rays around, overhead (actually there is not much air left overhead) that causes the blurring problem, nor the aircraft and telescope shaking that causes the problem, but rather the "shear layer" stream of air shooting past the open airplane cavity where the telescope sits, at 500 mph. This air motion worsens the resolution (the opposite of blurring) to 3 arc secs at visible wavelengths.
But the problem at the long wavelengths is different - it's diffraction. Basically, the far-infrared light observed by SOFIA passes through the shear stream of air unperturbed. But this light has such a long wavelength, 100x to 1000 times the wavelength of visible light, that the SOFIA telescope is of insufficient size to focus it sharply, and blurriness results. At wavelengths in the far-infrared, like 60 micrometers, there is significant blurring due to this effect. The telescope is actually held extremely steady while observing occurs, even in turbulence. It's held about as stable as a mountaintop telescope sitting on a 10 meter cement foundation, but diffraction still blurs the image.
So how do you do this? First, you isolate the telescope from the airplane by mounting it on a spherical pressurized oil bearing. The plane shakes and quakes, but the telescope doesn't feel it. Second, you direct the wind away from the telescope by shaping the side of the airplane so as to deflect it, and install a little deflector fence on the edge of the telescope cavity as well. Third, you stabilize the telescope against sudden motion (wind does get through) by spinning three orthogonal gyroscopes which are rigidly attached to the structure, and fourth, you steer the telescope so as to keep it steady, by tracking a distant star and giving the telescope magnetical nudges to point it toward a fixed direction. [/color] |
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Skyray
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« 回覆文章 #28 於: 2008-01-03 21:13:02 » |
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嗯嗯~那次俯衝事件~最近在國家地理頻道的空中浩劫節目有介紹 |
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觀星之樂~貴在分享
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Hung,Jim
衛星
文章: 62
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« 回覆文章 #29 於: 2008-01-03 21:21:12 » |
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Q： 望遠鏡指向瞄準目標天體的最大容許時間是多久？ 即使你可以調整望遠鏡，目標天體終將超出視野範圍?
A： 數個小時通常是最大的容許時間。 由於地球的自轉，目標物會在天空畫出弧線。 飛機的運動也會多少對這個天體的視運動作出一點增加或減少的效應。 因此，當觀察一個目標的時候，望遠鏡似乎隨著天空畫出一道弧線，雖然它實際上正在牢牢固定停留指向宇宙深空之遠點上－看起來卻好像在移動一般。 飛行觀測全程中，機身慢慢地相對於地面劃出它自己的弧度以便目標物相對於飛機保持正確的角度，如此望遠鏡便能持續凝視目標。基本上，在數小時後，目標物要不是落得太靠近地平線附近，就是太靠近天頂附近而無法繼續追蹤，要不就是飛機一直長久在同一個方向飛行，離家(基地)太遠了。 此時，就要更改指向位在另一個天區的其他目標天體來觀測了。 這些觀測飛行都會在事前仔細地被計畫過再執行。
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觀星論壇 
