August 19, 2019

Astro-Event: Mars at Opposition.

Contrary to the once-every-August viral emails soon to be clogging your inbox, Mars will not appear as “large as a Full Moon” on this or any other year… but Mars will reach opposition this week on Friday, January 29th. Unfortunately, this apparition isn’t a particularly favorable one; Mars will only reach 14.1” arc seconds in apparent diameter, a far cry from the excellent 2003 opposition where it reached 25.1”, very close to the possible max. This is due to the fact that while Earth reached perihelion earlier this month, Mars is also very close to aphelion in its relatively eccentric orbit. In fact, although Mars approaches us every two years or so, the next really good opposition won’t be until 2018 (24.3”).  Still, any opposition of the Red Planet is worth viewing, as it is rare that Mars reveals any detail at all! Mars is currently in the constellation Cancer, and rises low in the east after sunset. Shining at magnitude -1.2, Mars is unmistakable for its orange-to red glow. Do things look a bit yellowish? A planet wide dust storm could be underway, as it is entering spring on the northern hemisphere of Mars.

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