C/2019 Y4 (ATLAS)

Celestial visitors from the edge of the Solar System.
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Christopher K.
Posts: 5041
Joined: October 12th, 2009, 3:28 pm
Location: Baton Rouge, LA

C/2019 Y4 (ATLAS)

Post by Christopher K. »

Today there are general media outlets reporting that Comet ATLAS may shine as bright as the Moon later this spring. I notice the headlines don't specify Full Moon or the Moon at another phase. That ambiguous reporting is a little irresponsible. it is true, ATLAS is brightening somewhat faster than predicted but not too much. If we are fortunate, ATLAS may brighten anywhere from magnitude 2 to 0--to magnitude -1 if we're really lucky. It just moved into Andromeda a couple of nights ago.

However, this is one of those teachable moments. We need to get rid of some of this light pollution right now, as honestly we never know when we'll need a natural sky to see a pleasant surprise like a fairly bright comet.

More information:
http://www.aerith.net/comet/catalog/2019Y4/2019Y4.html
https://www.cometchasing.skyhound.com/c ... 019_Y1.pdf

Here's an image from the first week in March...
https://skyandtelescope.org/online-gall ... -y4-atlas/

Christopher K.
Posts: 5041
Joined: October 12th, 2009, 3:28 pm
Location: Baton Rouge, LA

Re: C/2019 Y4 (ATLAS)

Post by Christopher K. »

ATLAS is currently about nine light-minutes from Earth--1.62 billion kilometers (if my math is correct). It seems to share the same path as the Great Comet of 1844. Does that mean the 1844 object and ATLAS were once one large comet that broke apart?

A nice image from Rolando Ligustri:
https://apod.nasa.gov/apod/ap200321.html

Christopher K.
Posts: 5041
Joined: October 12th, 2009, 3:28 pm
Location: Baton Rouge, LA

Re: C/2019 Y4 (ATLAS)

Post by Christopher K. »

Wow. Bob King is reporting that ATLAS is brightening "exponentially". Alastair Ling seems even more excited. We should be cautiously optimistic--comets are notorious for teasing skygazers with possible brilliant apparitions only to shine feebly or even break into pieces.

More information:
https://skyandtelescope.org/astronomy-n ... ye-object/
https://astronomy.com/news/observing/20 ... -naked-eye

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