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Jupiter Saturn conjunction 木土会聚

12/20 evening. They will be at their closest on the evening of 12/21 which is forecast to be cloudy. Already it can be hard to tell them apart with the naked eye. They haven't been seen this close for several hundred years. Jupiter is quite bright right now. Saturn are smaller and much further from Earth hence obviously dimmer but its ring is still identifiable. The moons of Jupiter is a lot dimmer. No one shot can get all of them properly exposed, so this is a composite of three images taken within the span of half an hour, one for Jupiter (ISO 1600, Av 6.3, Tv 1/640), one for Saturn (ISO 4000, Av 6.3, Tv 1/400), and one for the moons (ISO 12800, Av 6.3, Tv 1/50). Based on that we can deduce to us Jupiter is probably about 100 times brighter than its four moons captured here. 12月20日。它们在21日最近但天气预报多云。20日已经近的肉眼难以区分了。上次它们这么近已经是几百年前的事儿了。木星很亮，土星小离我们又远要暗不少还好星环看得出，木星的卫星就暗的几乎照不到了，所以这是三张照片的叠加。拍摄参数比较：木星 (ISO 1600, Av 6.3, Tv 1/640), 土星 (ISO 4000, Av 6.3, Tv 1/400), 木星的卫星 (ISO 12800, Av 6.3, Tv 1/50)。根据这个推测结论是对我们来说木星比它的卫星亮一百倍。

Aperture: 6.3	Shutter:
ISO:	Flash: Off
FL: 600 mm	Lens: SP 150-600MM F/5-6.3 Di VC USD

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