Wednesday, January 10, 2018

Astronomy Daily *Live* Every Day at 02:00 UTC

I'm jumping into a new realm of insanity.  Hope you'll join me on the ride!

Astronomy Daily *Live*

ADL is a casual, open-minded, skeptical, educational, and fun conversation about astronomy and related fields.  Whether you're a newbie, amateur, advanced amateur, or professional, please join me every day at 02:00 UTC starting on 14 January 2018.  Most conversations will be directed by the participants, but I'll usually have some topics in my back pocket to keep the conversation flowing.  Open topics can include Q&A, observing, gear, telescopes, cameras and other instrumentation, data analysis and research, journal paper reviews, personalities, astro-art, projects and institutions, and pretty much anything else the participants suggest.

Consider this as a daily gathering of friends to hang out and discuss topics of mutual interest.  Get away from the TV and the news for a while, and come talk live with people from all around the world who share a similar passion for astronomy!

Email cosmiclettuce AT gmail DOT com and I'll send you a link to become a panelist when the show goes live!

My youtube channel URL is: https://www.youtube.com/user/cosmiclettuce

Please subscribe, set a reminder, and join the conversation!


Saturday, June 10, 2017

Continuing to Contemplate Galilean Moon Motion

I decided to see if there are any explanations for what the higher-order derivatives (3rd, 4th, 5th) of position actually feels like, and I didn't get much of an answer.  However, they all have names.  The best source of info on this subject that I was able to find is this article:

What is Derivatives Of Displacement?

So yes, the 3rd derivative is called 'Jerk', which I call 'Bump' -- it's a change in acceleration.  The 4th derivative is 'Jounce' (the change in the 'Jerk') and 5th derivative is called 'Crackle' (the change in the 'Jounce'), which to me don't relay any kind of physical sensation.

In the case of the motions of Jupiter's Galilean moons, I can now look at the past seven days of motion:











Wednesday, June 7, 2017

Galilean Moon Motion 08 June 2017

Looking at the motions of the four Galilean moons of Jupiter.  The following plots are for 08 June 2017.

In all of these plots, I'm showing the 0th (position), 1st (velocity), 2nd (acceleration), 3rd, 4th, and 5th derivatives of position as a function of time.  So the 0th derivative is in km, 1st is km/minute, 2nd is km/min^2, 3rd is km/min^3, 4th is km/min^4, and 5th is km/min^5.  What do the higher-order derivatives feel like?  Not sure, but the 3rd order probably feels like a bump (a change in acceleration).


Io motion around Jupiter:



Europa motion around Jupiter:



Ganymede motion around Jupiter:



Callisto motion around Jupiter:



Io motion relative to Europa:



Io motion relative to Ganymede:


Here's how the 4th derivative sounds:


Io motion relative to Callisto:



Europa motion relative to Ganymede:



Europa motion relative to Callisto:



Ganymede motion relative to Callisto:


All of this will be converted to audio so I can experience how it sounds.

Saturday, February 25, 2017

Chaos Plots

These images are based on the equation:

N+1 = (lam) * N * (1-N)

where 'N' is the current population level (scaled between zero and one) and 'N+1' is the next population level.  'lam' goes from zero to about five until things get a bit crazy.

This little work is based on the video:

https://www.youtube.com/watch?v=ETrYE4MdoLQ

In the plots below, the x-axis is the 'lam' value, and the y-axis is the 'N' value.


Friday, January 8, 2016

CMS Audio and Visual

In today's Weekly Space Hangout, the guest was Elizabeth S. Sexton-Kennedy who works at Fermilab with the Compact Muon Solenoid (CMS).  I enjoyed the interview very much and it was a breath of fresh air to be focusing on non-astronomical topic that indeed has many astronomers very interested.  At one point in the interview, she very briefly but proudly mentioned that CMS data is available to the public.  I don't necessarily consider myself "The Public" but what I heard was that CMS data was publicly available.

So I started my hunt.  The goal was to see if I could take some CMS data and turn it into audio and visual interpretations.

It was pretty easy to find the data.  I had quite a choise so I just blindly chose the first one: "Dimuon events with invariant mass range 2-5 GeV for public education and outreach" which happened to be a file containing two thousand data points (maybe they're individual events????) that I haven't a clue about.  At the top of the .csv file is a very short header apparently describing the values therein.  I noticed that columns 4, 5, and 6 were labeled "px1", "py1", and "pz1".  So I'm sort of taking that as some sort of three-dimensional coordinate system.

I can work with that.

So what I did was a calculated the "distance" between each "event" coordinate and the origin (0,0,0 in 3D space), giving me a radial distance between the "event" and the origin.  I then sorted them by distance and translated those values into audio frequencies and came up with the following (in all of these cases, a lower frequency means a smaller distance; also note that I've kept the amplitude of each frequency the same):

This is the sound of the five hundred "events" that were nearest the origin.

CMS Dimuon 0 to 500

Here is the sound of the five hundred "events" starting at the 500th furthest one from the origin:

CMS Dimuon 500 to 1000

here is the sound of the five hundred "events" starting at the 1000th furthest one from the origin:

CMS Dimuon 1000 to 1500

here is the sound of the five hundred "events" starting at the 1500th furthest one from the origin:

CMS Dimuon 1500 to 2000

And here, at last, is all of them combined into one sound (2000 notes playing at the same time!):

CMS Dimuon All Events

Now of course I had to make some pretty pictures using the same data.  All I've done here is plot the values and in some cases connect the dots.  Hope you like 'em.  I think they're beautiful!

Looks like a white blood cell, a stange snowflake, or a spiney cotton ball
Looks like a globular cluster

Thursday, December 31, 2015

Galilean Moon Mutual Shadows and Mutual Transits

Dave Dickenson recently published his annual Top 101 Astronomical Events for 2016 and I was surprised to see that (at least according to this article) the shadows of pairs of moons (he calls them 'double shadows') was visible from Earth twenty-seven times!  Wow so that takes up 26.73% of all the events for this year!

"Dave!", I thought, "why did you mention these events if for no other reason than filler so you could get up to your famous 101 events?"  You were actually very very lucky to have just the right number of double shadow events to fill what would otherwise be a big gap in your list.

Mutual events involving two or more moons plus Jupiter itself is pretty exciting, but aren't there any other things -- perhaps more interesting -- going on there?  What about actual moon transits?  Too many or too few to fit into your pre-determined number of top events for 2016?

I, for one, don't think that the moon transits should be left out, especially if you're already looking for moon shadow transits anyhow.  But listing shadows and transits would have made the list way too unbalanced, so maybe this is why Dave chose just the shadow events -- because they fit.

So I decided to take a look and see what else is happening at Jupiter this year from Earth's POV.  Plus, like any good scientist, I wanted to check Dave's work.  I'm happy to announce that, for the most part, our results agrees.

So I found Galilean moon event predictions at the IMCCE and wrote a program to parse the data and tell me when each moon is transiting and when it's shadow is transiting.

I then produced these plots.  The first shows the shadow events and the 2nd shows the transit events.

Shadow Events

Transit Events

The y-axis is an arbitrary value that allows me to separate events.  The x-axis is the day number for this year (2016).  I've labeled the events.

According to this data, there are 25 'double shadow' events and 30 'double transit' events.  The two events that Dave has on his list that I don't have on mine are:

12 April double shadow Io - Europa
08 November double shadow Ganymede - Europa

Not quite sure where Dave got his data, but this is clearly a case of "your results are only as good as your data".

Here are the events I found (EV=event, MM=month, DD=day, HH=hour, MM=minute):

Shadows (under the EV column: I = Io, E = Europa, G = Ganymede, C = Callisto):

    EV MM DD HH MM   MM DD HH MM Comment
----------------------------------------------
 1. IE  2 22 20 42 -  2 22 20 46
 2. IE  2 26  9 38 -  2 26 10  4
 3. IE  2 29 22 35 -  2 29 23 22
 4. IE  3  4 11 32 -  3  4 12 40
 5. IE  3  8  0 29 -  3  8  1 59
 6. IG  3  9 18 57 -  3  9 19 11
 7. IE  3 11 13 26 -  3 11 15 17
 8. IE  3 15  2 23 -  3 15  4 35
 9. IG  3 16 20 51 -  3 16 23  6 Io Passes Gan
10. IE  3 18 15 19 -  3 18 17 35 Io Passes Eur
11. IE  3 22  4 24 -  3 22  6 32
12. IG  3 23 23 48 -  3 24  1  0
13. IE  3 25 17 42 -  3 25 19 29
14. IE  3 29  7  1 -  3 29  8 26
15. IE  4  1 20 19 -  4  1 21 23
16. IC  4  3 15 12 -  4  3 15 51
17. IE  4  5  9 38 -  4  5 10 20
18. IE  4  8 22 56 -  4  8 23 17
19. IC  5  7  4 40 -  5  7  5 43
20. IG  8  7  5 32 -  8  7  6 34
21. IG  8 14  7 33 -  8 14  9 41
22. IG  8 21 11 31 -  8 21 11 36
23. EG 10 17 20 59 - 10 17 22 14
24. EG 10 24 23 33 - 10 25  2  8 Eur Passes Gan
25. EG 11  1  3 20 - 11  1  4 41


Transits:

    EV MM DD HH MM   MM DD HH MM Comment
----------------------------------------------
 1. IE  2 19  8 11 -  2 19  8 18
 2. IE  2 22 21  3 -  2 22 21 27
 3. IE  2 26  9 54 -  2 26 10 34
 4. IE  2 29 22 46 -  2 29 23 43
 5. IE  3  4 11 38 -  3  4 12 50
 6. IE  3  8  0 30 -  3  8  1 58
 7. IG  3  9 18 55 -  3  9 18 59
 8. IE  3 11 13 21 -  3 11 15  6
 9. IE  3 15  2 13 -  3 15  4 14
10. IG  3 16 20 39 -  3 16 22 15
11. IE  3 18 15  5 -  3 18 17 20 Io Passes Eur
12. IE  3 22  3 57 -  3 22  6 12 Io Passes Eur
13. IG  3 23 22 23 -  3 24  0 38 Io Passes Gan
14. IE  3 25 16 52 -  3 25 19  4
15. IE  3 29  6  1 -  3 29  7 56
16. IG  3 31  1 40 -  3 31  2 22
17. IE  4  1 19 10 -  4  1 20 49
18. IE  4  5  8 19 -  4  5  9 41
19. IE  4  8 21 29 -  4  8 22 34
20. IE  4 12 10 40 -  4 12 11 28
21. IE  4 15 23 50 -  4 16  0 21
22. IE  4 19 13  2 -  4 19 13 15
23. IG  8 14  6 46 -  8 14  7 56
24. IG  8 21  9  5 -  8 21 11  2
25. EG 10 10 18 53 - 10 10 19 17
26. EG 10 17 21 41 - 10 17 23 42
27. EG 10 25  1 13 - 10 25  3  3
28. EG 11  1  5 40 - 11  1  5 49
29. IG 12 21 13 19 - 12 21 14 18
30. IG 12 28 16  1 - 12 28 17 26


What I think is very very cool about these events is that in some of them, one moon passes the other one while both are in transit!!!!!

In 2016, there are no triple or quadruple shadows or transits, unlike in 2015.  I looked ahead to 2017 and see pretty much the same as 2016.