It is expected to be just naked eye visible. Will definitely be able to see it with binoculars — and, of course, a telescope, even a small one. It will be a green fuzzy ball. There will be NO TAIL per se. So, don’t be looking for the tail. Just a fuzzy, glowing green ball. The green ball should be fairly big — bigger than a star.
For us in New England, the easiest bearing is going to be the easy to locate ‘winter cluster’ — Pleiades (the seven sisters). See the chart above.
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Comet C/2018 V1 ( Machholz-Fujikawa-Iwamoto )
Discovered: November 7, 2018 (yes, just last week).
Discoverers: One is Arizona (Donald E. Machholz, Jr.) & two in Japan (Shigehisa Fujikawa & Masayuki Iwamoto). You can find more here. Hence the name which credits all three.
C/2018 V1 is much more of a CLASSIC comet than our current ‘Christmas Comet of 2018‘, i.e., 46P/Wirtanen. That is why it has a ‘C/’ designation while the other is a ‘P/’. The ‘P/’ denotes that 46P/Wirtanen is a PERIODIC comet — one that swings around the sun on a regular basis (like a commuter). The ‘C/’, on the other hand, means that is a NON-PERIODIC. It means that this comet has not been previously seen in the last 200-years. Typically it means that it is a FIRST TIME visitor from far, far out in the Solar System, ideally from the Oort Cloud, the incubator of most comets at the very edge of our Solar System.
So, we are assuming it is a FRESH comet, with a lot of frozen matter that will sublimate as the comet gets closer and closer to the Sun. That is what makes it visible, gives it a tail and with luck makes it spectacular. Right now it is touch and go. Viewed through a powerful telescope you can already see a blue tail — that color indicating the presence of ionized Carbon Monoxide (CO+).
On Tuesday, November 27, 2018 it will be at its closest to Earth — 62 million miles. Comet ISON (C/2012 S1) that could have been the GREAT COMET of 2013 would have been 40 million miles. So, C/2018 V1 will be 22 million miles further out. BUT, unlike ISON it will make it around the Sun. That is a given. It is NOT a sungrazer. Actually it doesn’t get very close to the Sun! As you can see from the above diagram it does not even cross Mercury’s orbit.
Right now it is BORDERLINE — but shows more promise than 46P.
I will keep you posted. This was a BIG heads up.
I have been keeping an eye on it as promised.
Touch-and-go right now. Teetering right on the edge of naked eye visibility — and even that means you are not going to be able to see it unless you have no ambient light. So forget seeing it from a city.
Alas. I am bummed for ALL of us.
But, I will keep on checking and let you know. OK?
Keep fingers, toes, and MOST OF ALL your eyes, crossed. That helps.
It will NOT be spectacular, and it is definitely not a great comet, BUT, it is expected to be naked eye visible and it will be — WITHOUT FAIL — appear the week before Christmas 2018. It is Periodic Comet with a 5.4 year orbital period. So, it is a well known comet and one that is not going to fizzle away as did MY comet ISON in 2013.
This is just the initial heads-up. I just found out about it today. I will keep you posted. Promise.
Just mark it on your calendar. December 16, 2018 — COMET!
Exciting. We haven’t had a decent naked eye visible comet in DECADES!
It will NOT be spectacular, and it is definitely not a great comet, BUT, if it is naked eye visible, it, with its green tinge (due to its chemical composition), should be quite the sight up there. We have not see a decent comet since the mid-1980s. Comet ISON, on which I expended considerable time and energy, vaporized when it got too close to the Sun.
No such danger with 21P/Giacobini–Zinner. This is not a sungrazer.
The ‘P’ in the 21P denotes that it is a periodic comet; i.e., a comet that has made at least 2 well observed orbits around the Sun. Actually 21P orbits the Sun every 6 years. It is very periodic. It doesn’t go too far away. Just beyond the orbit of Jupiter. It is well known and well studied comet that was discovered in 1900.
I will keep you posted. I was excited to hear that it might be naked eye visible. Wow.
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Though it will be close, it is NOT a very big comet. Plus, being a PERIODIC that goes around the Sun once every 5.25 years, and has been doing so for a long time, it has expended some/much of its frozen ices that vaporize to create the tail. So it will NOT be putting on a dazzling show. If anything it will JUST (and I mean JUST) be naked eye visible. Best to try and see it with a telescope or a pair of binoculars.
Click to ENLARGE.
Nothing to get too excited about. For a start, this same comet, 45P (where the ‘P’ indicates that it is ‘periodic’), flew by, even closer in 2011.
7.72 million mile separation is pretty respectable — 32x GREATER than the distance to the Moon.
So, don’t panic. Plus, it is quite a small comet, maybe a MILE across, max.
You may hear in the media that this the 8th closest approach by a comet. That is 8th closest as of 1950s when we really got good at measuring these distances — and you have to ALWAYS add, ‘KNOWN’.
This comet, 45P, even at this distance is unlikely to be naked eye visible!
So think of all the comet flybys our ancestors would have been oblivious to.