|
Bubble Nebula (NGC
7635) &
M52 (NGC 7654)
|
|
OBJECT INFO (圖片資料)
|
|
|
Name of Object
(名稱)
|
Bubble
Nebula (NGC 7635) & M52 (NGC 7654) (lower left)
|
|
Celestrial
Location (天球位置)
|
Cassiopeia
Constellation (仙后座)
|
|
Distance from Earth
(距離地球)
|
11K
light years (Bubble Nebula); 5K light years (M52) (光年)
|
|
Distance across Object
(物件左右距離)
|
10
light years (Bubble Nebula) ; 19 light
years (M52) (光年)
|
|
Angular Size of
Object(物件視角大小)
|
15
arc min (角分) (Bubble Nebula); 13 arc min (角分) (M52)
|
|
Angular Width of
Picture (圖片視角)
|
~
1.2 degree (度)
|
|
Resolution
(解像度)
|
800 x
600 pixels (像素);
Higher resolution 1280
x 960 pixels
|
|
CAPTURE DATE/
LOCATION/ WEATHER(拍攝時/地/天氣)
|
|
|
Captured
Date (拍攝日期)
|
10-07-2007 |
|
Captured Time (拍攝時間)
|
3.00
am |
|
Elevation during capture
|
42.75
degree above horizon (仰角) |
|
Celestrial position
during capture
|
40
degree before Meridian (未過中天) |
|
Location (地點)
|
Yung
Shu O, Sai Kung, New
Territories, Hong Kong, China (中國香港新界西貢榕樹澳)
|
|
Altitude (海拔)
|
~30
m (米) |
|
Ambient
Temperature (氣溫)
|
~26
C (攝氏) |
|
Humidity (濕度)
|
88%
RH |
|
Transparency (透明度)
|
5/10 |
|
Seeing (視寧度)
|
5/10 |
|
Visual Magntitude (目視星等)
|
~
4 (等) |
|
Weather (天氣)
|
Fine,
cloudless (晴空万里)
|
|
LIGHT POLLUTION(光害)
|
|
|
Moon Age (月齡)
|
25
(just rose at 7.5 deg at ENE/月剛出) |
|
Neighbouring Light Pollution(附近光害)
|
Some
street/village lamps nearby (有街/村屋燈) |
|
IMAGING
SCOPE/LENS (拍攝鏡)
|
|
|
Imaging Scope (主鏡)
|
Orion
80ED F7.5 Refractor (折射鏡) |
|
Focal Length(焦距)
|
600mm |
|
Effective Focal Ratio (有效焦比)
|
F7.5 |
|
Filter(s)
(濾鏡)
|
Hutech
LPS-P2; Hutech Front Filter |
|
RECORDING DEVICE(影像記錄儀器)
|
|
|
Recording Device
(机身)
|
Modified(改裝)Canon
350D
|
|
Device
Temperture (机身氣溫)
|
>30C
(攝氏) |
|
ISO (感光度)
|
400 |
|
Exposure (曝光)
|
5
min per frame (每張 5分鐘) |
|
Stacked Frames (加叠)
|
11
(張) |
|
Device Settings(參數)
|
AWB |
|
MOUNT/TRACKING(追踪器材)
|
|
|
Mount
(赤導儀)
|
Takahashi EM200 Temma 2
(高橋赤導儀)
|
|
Guide Scope (導星鏡)
|
SV 66 ED F6.6
(400mm)
|
|
Auto Guider (導星儀器)
|
Unmodified
ToUCam |
|
Guiding Software(導星軟件)
|
PHD
Guiding |
|
Guiding parameters (導星參數)
|
Exposure
~1 sec |
|
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