M81 (Bode's Galaxy) + M82 (Cigar Galaxy)

 

OBJECT INFO (圖片資料)

Name of Object (名稱)

M81 (Bode's Galaxy)  + M82 (Cigar Galaxy) (left)
Celestrial Location (天球位置) Ursa Major Constellation (座)
Distance from Earth (距離地球) 11.8M light years (光年)
Distance across Object (物件左右距離) 130K light years (光年) between M81 & M82
Angular Size of Object(物件視角大小) 21 x 10 (M81) & (M82) arc min(角分)
Angular Width of Picture (圖片視角)  ~ 1.2 degree (度)
Resolution (解像度) 800 x 600 pixels (像素)
CAPTURE DATE/ LOCATION/ WEATHER(拍攝時//天氣)
Captured Date (拍攝日期) 11-11-2007
Captured Time (拍攝時間) From 4.11 am
Elevation during capture 36.8 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村)

 

Altitude (海拔) ~ 30 m (米) 
Ambient Temperature (氣溫) ~21 C (攝氏)
Humidity (濕度) 75-85%
Transparency (透明度) 6/10
Seeing (視寧度) 6/10
Visual Magntitude (目視星等) 3.35 (等)

Weather (天氣)

 

 

Fine without clouds, mild wind (天晴無雲、微風)

 

 

LIGHT POLLUTION(光害)
Moon Age (月齡) 1 (already set down/月已下山) 
Neighbouring Light Pollution(附近光害) Slight street/village lamps nearby (有街燈/村屋燈)
IMAGING SCOPE/LENS (拍攝鏡)
Imaging Scope (主鏡)  TEC 140 F7 Refractor (折射鏡) 
Focal Length(焦) 980mm
Effective Focal Ratio (有效焦比) F7
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) 24-26C  (攝氏) 
ISO (感光度)   400
Exposure (曝光) 5 min per frame (每張5分鐘)
Stacked Frames (加叠) 16 (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 66mm F6.6 (400mm) Scope
Auto Guider (導星儀器) QHY 5
Guiding Software(導星軟件) PHD Guiding v 1.61
Guiding parameters (導星參數) Exp :  1-2 sec

 

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