Advertisements
Tag Archive | comet ISON

Christmas Comet Of 2018 — 46P/Wirtanen — MIGHT NOT Be Naked Eye Visible.

by Anura Guruge



Click to ENLARGE and admire. From the JPL Small-Body Database Browser.


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.


Related posts:
Check Category ‘astronomy’.


by Anura Guruge

Advertisements

Christmas Comet Of 2018 — 46P/Wirtanen.

by Anura Guruge


Click to ENLARGE and read here. Wikipedia: en.wikipedia.org/wiki/46P/Wirtanen


Click to ENLARGE and admire. From the JPL Small-Body Database Browser.


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!


Related posts:
Check Category ‘astronomy’.


by Anura Guruge

A Naked Eye Visible Comet, FINALLY, 21P/Giacobini–Zinner — In September 2018.

by Anura Guruge


Click to ENLARGE and read here. Wikipedia: en.wikipedia.org/wiki/21P/Giacobini–Zinner


Click to ENLARGE and admire. From the JPL Small-Body Database Browser.


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.


Related posts:
Check Category ‘astronomy’.


by Anura Guruge

A/2017 U1 — Too Speculative To Claim That It Is ‘Interstellar’.

by Anura Guruge


Click to ENLARGE. From NASA/JPL @ http://www.jpl.nasa.gov.


Click to ENLARGE. Wikipedia: en.wikipedia.org/wiki/A/2017_U1


Definitely extremely interesting and intriguing. Wow. Orbital eccentricity of 1.1922! The greatest we have ever seen — the keywords here being ‘ever seen’. Comet ISON, that crashed and burned on Thanksgiving Day 2013 had an eccentricity of 1.0000015.

But, here is the deal with eccentricity. Anything over 1.0 means that the object will eventually leave our Solar System. That we know. But, what we cannot tell as yet is WHEN A/2017 U1 got that highly eccentric orbit. We just do NOT know — as yet. And maybe never will.

To claim that it must have originated OUTSIDE of our Solar System — is speculative. We do NOT have enough evidence.

NASA/JPL’s official statement confirms that: “So far, everything indicates this is likely an interstellar object, but more data would help to confirm it.” Note the ‘likely‘ and the part about ‘more data … for confirmation‘. That is exactly MY POINT and what I am trying to impress.

The claim that its orbit was NOT influenced by a close encounter with a planet — typically one of the BIG ones — is speculative. It could have been majorly torqued around by Uranus or Neptune. We don’t know.

I have a druthers that this is a very old comet — a periodic one at that, which on its last trip out, maybe 400 years ago got too close to a gas giant and had its orbit turned ‘upside down’.

We don’t know.

All I am stressing is do NOT jump to conclusions.

We know so little about what has happened in OUR Solar System and what is happening right now.

But, it is exciting.


Has a ton of good information about comets.

Related Posts:
++++ Check Categories ‘Events’ &  ‘Astronomy’ for other related posts >>>>


by Anura Guruge

Alton (N.H.) Gilman Library, “Sky Over Alton” Astronomy Presentation, October 17, 2014 — Some Pictures.

Anura Guruge, June 8, 2013.
..
...
..
….
.

by Anura Guruge


Related posts:
>> Slides for Alton Library astronomy presentation.
>> Alton Gilman astronomy presentation
>> Oct. 5, 2014.
>> Oct. 17 Alton presentation in ‘Baysider’ — Oct. 9, 2014.


>> Alton Gilman Library presentation
>>Nov. 6, 2013.
>> Presentation videos — Nov. 5, 2013.
>>
Taylor Presentation pictures — Nov. 5, 2013.

>> I make it to NASA — Nov. 4, 2013.

++++ Search on ‘Comet ISON’ on sidebar for other posts >>>>

**** Check my ISON blog.


Click to ENLARGE.

All these pictures (bar the first two) were taken by Devanee Guruge.

Alton photographer, John Bishop, a friend, who arrived and joined Devanee in taking pictures. So I had two tripods with cameras at the back.


It wasn’t packed but the folks that were there were very receptive and engaged. I had planned for about 90 minutes but we were still there, having a lot of fun, 2 hours later. They seemed to really like it — or at least that is what they claimed.

I had fun. But, I have never done a presentation where I have not had fun.

Our friend, Alton photographer, John Bishop, turned up — unexpectedly given that we thought we was going to be in Manchester visiting a friend that was in hospital. John set up his, professional grade Canon, and started taking pictures in tandem with Devanee — who relished the opportunity to use my Canon. I should get John’s pictures on Sunday.

Part II of this astronomy presentation is on Friday, November 20, 2014. You can come to that even if you didn’t come to last night. They are self-contained, though I will not go over the same material.

So that was that. I am glad that I did it.

Holly Brown, the librarian, always extremely nice, had displayed my astronomy books on a table etc. She was very happy, and that was good.


Slide (Hardcopy) For Gilman Library, “Sky Over Alton” Astronomy Presentation On October 17, 2014.

Anura Guruge, June 8, 2013.
..
...
..
….
.

by Anura Guruge


Related posts:
>> Alton Gilman astronomy presentation
>> Oct. 5, 2014.
>> Oct. 17 Alton presentation in ‘Baysider’ — Oct. 9, 2014.


>> Alton Gilman Library presentation
>>Nov. 6, 2013.
>> Presentation videos — Nov. 5, 2013.
>>
Taylor Presentation pictures — Nov. 5, 2013.

>> I make it to NASA — Nov. 4, 2013.

++++ Search on ‘Comet ISON’ on sidebar for other posts >>>>

**** Check my ISON blog.


skyoverlatonflashpdf

Click image IF you want to download a 3.2MB Adobe Acrobat PDF of the slides. I tried to keep the transitions to a minimum so that most of the images will appear in the PDF. But, I am so used to using animation that I did NOT succeed entirely — though, I think, this is the BEST I have ever done. So IF some slides don’t make sense or they look incomplete is because there are OVERLAY transitions [i.e., animations] that don’t make it to the PDF. Sorry.


altonskyoveroct17445a

The slides. Click to ENLARGE. Use image above to download PDF of the slides. See caption notes ABOVE.


%d bloggers like this: