獵戶座 4合星 Ori Trapezium 需多少倍

[peter]

https://familystar.org.tw/index.php?option=com_smf&Itemid=26&topic=30141.0


https://www.astropix.com/html/observing/trapezium.html



https://www.facebook.com/photo.php?fbid=1519802684795047&set=gm.1810869308970445&type=3&theater&ifg=1

http://s00639.blogspot.com/2012/11/


http://s00639.blogspot.com/2012/12/


這次是繼以前, 以前... 10" DOB 時期... 唯一一次 "非常明確" 分出 Trapezium 的 E與F星以來, 再度清晰分出 E, F的一次.

XW 7/117X 雖然小, 卻最銳利能拆出 E, F.
OR 5/163X 也差不多銳利.
XW 3.5/233X 雖可以把四合星拆得很開很穩定, 但是0.4mm 的出瞳徑好像太小,

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AI  

θ Ori A 和 θ Ori B 在60倍的倍率下，通常可以分開。這兩顆恆星之間的距離相對較大，在良好的視覺條件下，即使是中小口徑的望遠鏡（如100mm以下）也能夠區分它們。

θ Ori C 和 θ Ori D 的分辨就稍微有挑戰了
分辨θ Ori C和θ Ori D有更高要求，建議提升倍率到100倍


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https://www.cloudynights.com/forums/topic/606960-lowest-possible-magnification-to-see-4-stars-in-the-trapezium/

15 x 70 bino

Not enough low power view observations in my logbook. The lowest one is 39x at which I had no problem with seeing all 4 stars


I can see all four Trapezium stars in my 63mm Zeiss Telemator at 21x, but the faintest one is a bit challenging. At 34x, all four are quite easy.

[peter]

https://www.facebook.com/groups/101640086556073/posts/1599325780120822/

What's the minimum aperture and magnification for Orion's Trapezium

Bright main stars: A, B, C, D

Typical separations: ~8–13 arcseconds

Fainter companions: E (~4″ from A) and F (~4″ from C)

For A–D (8–13″ separations)  Minimum: 30–40×  Comfortable / clean split: 50–60× 

A–D (the main four stars) : 口徑 50–60 mm (2–2.4")
 
E and F (fainter, closer companions) 口徑   9~10cm
Minimum aperture:
E: ~80–90 mm
F: ~100–120 mm (more difficult due to glare and faintness)

For A–D (8–13″ separations)   Minimum: 30–40× ,  Comfortable / clean split: 50–60×
or E and F (~4″)  Minimum: 80–100×   More reliable: 120–150×