UmbralRaptor changed the topic of #kspacademia to: https://gist.github.com/pdn4kd/164b9b85435d87afbec0c3a7e69d3e6d | Dogs are cats. Spiders are cat interferometers. | Космизм сегодня! | Document well, for tomorrow you may get mauled by a ネコバス. | <UmbralRaptor> egg|nomz|egg: generally if your eyes are dewing over, that's not the weather. | <ferram4> I shall beat my problems to death with an engineer. | We can haz pdf
<egg|anbo|egg> augh saturn is getting treed
<egg|anbo|egg> hm I got lost
<raptop> Try backtracking to Albuquerque, and turning the other way?
<egg|anbo|egg> I keep getting lost trying to star hop to the saturn nebula s going to look elsewhere
<egg|anbo|egg> randomly clicked somewhere and Stellarium shows me PRN E19
<egg|anbo|egg> not going to image that one
* egg|anbo|egg googles M 29 cluster
<egg|anbo|egg> second result : M29 cluster bomb
<raptop> smol open cluster in cygnus
<raptop> Uh, for wikipedia porpoises, I always put in "messier $number" instead of "M $number"
<egg|anbo|egg> raptop: clever
<raptop> I mean, you're always going to get a bunch of ARs instead of the Eagle Nebula...
<raptop> !wpn
* galois gives raptop a mecha ultrarelativistic accident with a tablet attachment
* raptop isn't sure what just happened, but I'm going to blame Heather Flowers
<egg|anbo|egg> raptop: currently have a bit of M31 in field
<egg|anbo|egg> unsure whether I should try to find M110 from there
e_14159 has joined #kspacademia
<raptop> hrm, maybej
e_14159_ has quit [Ping timeout: 378 seconds]
<raptop> Incidentally, Andromeda has a number of globular clusters...
<galois> [WIKIPEDIA] Mayall II | "Mayall II, also known as NGC-224-G1, SKHB 1, GSC 2788:2139, HBK 0-1, M31GC J003247+393440 or Andromeda's Cluster, is a globular cluster orbiting M31, the Andromeda Galaxy.It is located 130,000 light-years (40 kpc) from the Andromeda Galaxy's galactic core, and is the brightest (by absolute magnitude..."
<raptop> SMG?
<egg|anbo|egg> raptop: M110 in frame I believe
raptop has quit [Read error: Connection reset by peer]
<egg|anbo|egg> uh oh
raptop has joined #kspacademia
<raptop> !acr -add:SMG SubMillimeter Galaxy (A galaxy, often at high z, with large emission in the submillimeter range. Typcial indicative of very high star formation rates)
<galois> Definition added!
egg|cell|egg has quit [Ping timeout: 204 seconds]
egg|cell|egg has joined #kspacademia
egg|cell|egg has quit [Remote host closed the connection]
egg|cell|egg has joined #kspacademia
* egg|zzz|egg pokes raptop with M110
<raptop> Please do not shoot my internet connection
<raptop> !8 should I run GALFIT on that image of M110?
<galois> raptop: no
* raptop pokes raptop in the mental health
<SnoopJeDi> !wpn raptop
* galois gives raptop a fibre
<SnoopJeDi> !8 is it dietary fibre
<galois> SnoopJeDi: no
<SnoopJeDi> !why not
<galois> SnoopJeDi: because reasons
<SnoopJeDi> !wpn -add:adj dietary
<galois> Added adj 'dietary'
<raptop> !8 is it an optical fibre?
<galois> raptop: no
<raptop> blink
<raptop> !wpn SnoopJeDi
* galois gives SnoopJeDi an optimized ITAR compliant heap
<raptop> ITAR compliant data structures
<SnoopJeDi> hack the planet
<SnoopJeDi> what's shaking tonight raptop, you okay?
<raptop> I think so
<_whitenotifier-d13c> [Principia] eggrobin synchronize pull request #2609: Flight plan rebasing - https://git.io/JfNM0
<egg|anbo|egg> ohai venus
<egg|anbo|egg> time for flats
<raptop> crescent venus?
<egg|anbo|egg> raptop: probably, but I am taking flats on the shutters
<egg|anbo|egg> which may be a terrible Idea because I can see the historgam changing shape
<egg|anbo|egg> stupid sunlight can’t stay the same colour for five minutes
<raptop> egg|anbo|egg: obviously you need a dome
<raptop> Helvetic 100 cm telescope!
<egg|zzz|egg> raptop: a dome isn’t enough, I would need a standard illuminator…
<raptop> egg|zzz|egg: uh, dome as in a permanant building for the scope, which would imply a standardish illuminator
* raptop eyes the incandecent bulb that we use
<egg|zzz|egg> there are a few incandescant bulbs in the telescope room so I guess I could use that
<egg|zzz|egg> raptop: ... incandecent sounds fun
<egg|zzz|egg> raptop: alternatively I guess something white under the sun around noon would give a pretty standard illumination
<egg|zzz|egg> convenient little blackbody
<egg|zzz|egg> friendly neighbourhood thermonuclear reactor
* raptop has gotten radiation burns from that reactor numerous times over the years
<raptop> But, like, the key thing with the illuminator is that it's effectively constant across the FoV
<egg|zzz|egg> well, a uniform surface lit at a constant angle by a thermonuclear reactor should do the job from that point of view
<egg|zzz|egg> and the angle (and air mass) should be roughly constant near noon
<egg|zzz|egg> contrary to now where the histogram develops a bump in 5 min
<egg|zzz|egg> hmm
<egg|zzz|egg> Should I sleep while the scope is taking darks and the sun rises over it
<raptop> hrm
<raptop> ...are the darks going to take that long?
<raptop> I mean, as long as it doesn't look directly at the sun, and finishes up before the conditions change too much, it should be fine
<egg|cell|egg> Well I took an hour of light on each target so I'll take an hour of dark
<egg|cell|egg> Scope is as cold as it will get and pointed at the building, cap on
<egg|cell|egg> I might take some flats in the afternoon if I'm not happy with the moving colour of the dawn flats
<egg|cell|egg> Whitequark: meow
<whitequark> рш
<whitequark> *hi
<egg|cell|egg> Heh
<egg|cell|egg> Мяу
<raptop> "rsh" is definitely the sound a slightly surprised cat would make
<raptop> 1:1 light:dark is more for when you're only taking a handful of images >_>
<egg|cell|egg> Raptop: a big handful
<egg|cell|egg> That way I'm reasonably sure that my darks don't increase noise
<egg|cell|egg> Otherwise I need to understand statistics of information theory
<egg|cell|egg> And I don't
<egg|cell|egg> s,of,or,
<raptop> hm
egg|anbo|egg has quit [Remote host closed the connection]
<_whitenotifier-d13c> [Principia] pleroy reviewed pull request #2609 commit - https://git.io/JfxRn
<_whitenotifier-d13c> [Principia] pleroy reviewed pull request #2609 commit - https://git.io/JfxRc
egg|anbo|egg has joined #kspacademia
raptop has quit [Ping timeout: 204 seconds]
<_whitenotifier-d13c> [Principia] eggrobin synchronize pull request #2609: Flight plan rebasing - https://git.io/JfNM0
egg|anbo|egg has quit [Remote host closed the connection]
egg|anbo|egg has joined #kspacademia
<_whitenotifier-d13c> [Principia] pleroy labeled pull request #2609: Flight plan rebasing - https://git.io/JfNM0
<egg|anbo|egg> UmbralRaptop: WeylandsWings: got a failure to align https://photos.app.goo.gl/rR5mCXs59JtLWz7D7
<_whitenotifier-d13c> [Principia] AnimMouse starred Principia - https://git.io/Jfxod
<egg|anbo|egg> UmbralRaptop: https://photos.app.goo.gl/rqC48zaa2iRSmuWb7
<egg|anbo|egg> UmbralRaptop: https://photos.app.goo.gl/eTNKdE4mXnC2o4G46
egg|anbo|egg has quit [Remote host closed the connection]
egg|anbo|egg has joined #kspacademia
<egg|anbo|egg> !wpn whitequark
* galois gives whitequark a fire symmetrical murder
<egg|anbo|egg> um
<egg|anbo|egg> !wpn
* galois gives egg|anbo|egg a service pollinating morphism
<egg|anbo|egg> !wpn UmbralRaptop
* galois gives UmbralRaptop a ruthenium modified coffee
<WeylandsWings> egg|anbo|egg: why do you have weird artifacting in both axes from the camera
<egg|anbo|egg> WeylandsWings: you mean at the edges?
<egg|anbo|egg> WeylandsWings: weird artifacts at the edges of the frames, and then stacked with tracking drift
<WeylandsWings> at
<WeylandsWings> ^ah
raptop has joined #kspacademia
<egg|anbo|egg> the cat is moving its feet while sleeping
<UmbralRaptop> hopefully it's having a good dream
<raptop> !wpn
* galois gives raptop a pathological death
* raptop x_x
egg|anbo|egg has quit [Ping timeout: 189 seconds]
egg|anbo|egg has joined #kspacademia
<egg|anbo|egg> !wpn raptop
* galois gives raptop an int VBLANK
<egg|anbo|egg> !wpn whitequark
* galois gives whitequark a panzerfaust
<egg|anbo|egg> !wpn -add:wpn Panzerschreck
<galois> Added wpn 'Panzerschreck'
<egg|anbo|egg> !wpn -add:wpn LRAC
<galois> Added wpn 'LRAC'
<raptop> !wpn egg|anbo|egg
* galois gives egg|anbo|egg a katyusha
<egg|anbo|egg> котюша
<egg|anbo|egg> hah
* egg|anbo|egg stares at the forecast
<egg|anbo|egg> maybe some cloudless weather between 2 and 3
<egg|zzz|egg> raptop: M 57 is cute
<raptop> yay
<raptop> !8 E&M?
<galois> raptop: no
* raptop ignores galois
<egg|zzz|egg> hm, forecast now says 30%ish high cloud cover for the whole night
<egg|zzz|egg> no low clouds though
<raptop> question 1 should not be this hard http://complex.gmu.edu/phd/exam/EM-Aug-2019.pdf
<_whitenotifier-d13c> [Principia] Pending. Build queued… - 
<_whitenotifier-d13c> [Principia] Pending. Building… - http://casanova.westeurope.cloudapp.azure.com:8080/job/Principia/4345/
<raptop> egg|zzz|egg, SnoopJeDi, mofh_: so, I'm stuck. It looks like there are 3 infinite series and I have no way to solve for them?
egg|cell|egg has quit [Ping timeout: 190 seconds]
<SnoopJeDi> oh I hadn't thought about them being concentric
<egg|zzz|egg> the non-concentric case reduces to two point charges, right?
<SnoopJeDi> should-do yea
<egg|zzz|egg> UmbralRaptop: not sure what you are trying to say with this first sentence
<raptop> egg|zzz|egg: trying to think about what the form of the solution would be
<egg|zzz|egg> the inner sphære is a point charge, and so you have a point charge inside a charged sphere (not necessarily at the centre, nobody tells you such a thing) such that the potential difference between the two is that of the battery
<raptop> something like V(r,θ) = 1/(4πε_0) * (q/r + p*cos(θ)/r^2)
<egg|zzz|egg> no you are trying to do geometry to a thing that is massively underspecified
<raptop> Yes, and the graders dislike partial credit, so I figure out how to get a solution anyway, or need to be almost perfect on the other problems
<egg|zzz|egg> you need to figure out how to approach this kind of problem though, because if you don’t solve them you don’t have a solution
<SnoopJeDi> agreed, it's hard to read too much into "two isolated spheres" so I suspect this has a straight-forward angle of attack, probably of the form \int{dE}, although I confess I can't immediately construct it in my head
<_whitenotifier-d13c> [Principia] Success. Build finished. - http://casanova.westeurope.cloudapp.azure.com:8080/job/Principia/4345/
<SnoopJeDi> err where dE is an infinitesimal amount of energy
<raptop> The grounded part does sort of help in that the potential is 0 at r=a and r=b, but half of an infinite series is still infinite
<raptop> hrm, that was poorly phrased
<SnoopJeDi> I think the point that they may not necessary be nested this way is a good one
<egg|zzz|egg> (and if nested, they may not be concentric)
<raptop> Er, it explicitly says that they're concentric?
<egg|zzz|egg> are we looking at the same Q1
<egg|zzz|egg> you linked Aug 2019
<raptop> gah
<raptop> that would change things a bit
<egg|zzz|egg> yes
* raptop has been working on the jan 2020 one
<egg|zzz|egg> it was very much looking like you were heading towards the wrong problem
<egg|zzz|egg> but that was because you were
<egg|zzz|egg> raptop: what does your book
<egg|zzz|egg> raptop: what does your book/your brain know about Green's reciprocation theorem
<raptop> egg|zzz|egg: the book is Jackson, so...
<SnoopJeDi> oh heh
<SnoopJeDi> makes sense that we were confused then
<egg|zzz|egg> I didn't know about it but since it is a hint I assume you do, and cursorily googling it finds examples that are furiously similar
<egg|zzz|egg> correction, I literally find this problem
* egg|zzz|egg proceeds to not read the solution
* raptop was mostly finding unrelated proof's of green's reciprocity theorem
<egg|zzz|egg> raptop: anyway, what does Jackson have to say about Green's reciprocation theorem
<SnoopJeDi> mentioned only in problem 1.11 in my (2nd?) edition
<SnoopJeDi> oh hrm no it's a first edition evidently
<egg|anbo|egg> (or what did the lectures have to say about it)
<egg|anbo|egg> cat is purring
<SnoopJeDi> !wpn cat
* galois gives cat an enterprise undulator
<raptop> egg|zzz|egg: no lectures really, it was a flipped classroom (in, uh, spring 2018?)
* egg|anbo|egg pets the cat, thereby imbuing it with a charge Q
<SnoopJeDi> hmm, I would've thought that'd give it a charged μ
<egg|anbo|egg> !choose bring the scope inside|what is sleep
<galois> egg|anbo|egg: Your options: bring the scope inside, what is sleep. My choice: what is sleep
<egg|anbo|egg> ;choose bring the scope inside|what is sleep
<raptop> hehe, kitty go brrr
<kmath> egg|anbo|egg: what is sleep
<raptop> brrr, prrr, close enough
<raptop> SnoopJeDi: in my 3rd edition: there's 1.12 (prove the theorem), 1.13 (vaguely similiar but between 2 infinite parallel plates), and 1.14 which is something different and another proof
<SnoopJeDi> your 1.12 is probably what I have in mine then
<SnoopJeDi> it could be that I have your 1.14 too I didn't really read the problem set, just a quick glance :)
<egg|anbo|egg> raptop: OK so 1.13 is likely what you want to go off of
<egg|anbo|egg> to understand how this theorem is applied
<egg|anbo|egg> I suppose this is 1.13 file:///C:/Users/robin/Downloads/Jackson_1_13_Homework_Solution.pdf
<egg|anbo|egg> um
<raptop> ssh guest@home.anbo.edu
<egg|anbo|egg> > To take advantage of this theorem, we take the real problem as one of the problems, and then we can choose whatever problem we want as the second problem as long as it has the same bounding surface of two conducting planes.
* raptop stares at Griffiths problem 3.44 (second edition)
<raptop> (part a is the parallel plates, part b is the spheres)
<egg|anbo|egg> yeah this question is lifted from Griffiths
<egg|anbo|egg> no matter
<egg|anbo|egg> you should solve it
egg|anbo|egg has quit [Remote host closed the connection]
egg|anbo|egg has joined #kspacademia
<egg|anbo|egg> ;choose there are clouds|high-altitude clouds arent real,
<kmath> egg|anbo|egg: there are clouds
<egg|anbo|egg> !choose there are clouds|high-altitude clouds arent real,
<galois> egg|anbo|egg: Your options: there are clouds, "high-altitude clouds arent real,". My choice: there are clouds
<egg|anbo|egg> I see through them though,
* egg|anbo|egg tries looking for M 31 through a tree
<egg|anbo|egg> it is a very tall ash tree
<egg|anbo|egg> if M 31 is in a large ash tree, is that Yggdrasil
<raptop> yes, and you should check for sneks
<_whitenotifier-d13c> [Principia] pleroy opened pull request #2610: The vector space of Poisson series - https://git.io/JfpYC
<_whitenotifier-d13c> [Principia] pleroy edited pull request #2610: The vector space of Poisson series - https://git.io/JfpYC
<_whitenotifier-d13c> [Principia] Pending. Build queued… - 
<_whitenotifier-d13c> [Principia] Pending. Building… - http://casanova.westeurope.cloudapp.azure.com:8080/job/Principia/4346/
<egg|anbo|egg> UmbralRaptop: which part of M 31 should I image
<egg|anbo|egg> field is 0°,358 by 0°,529
<egg|anbo|egg> smol field
<raptop> egg|zzz|egg: can you get the dust lane?
<egg|anbo|egg> raptop: sure, this is an earlier image I took https://photos.app.goo.gl/pnNjdsB1eEGYs9x19
<raptop> yeah, that works
<egg|anbo|egg> maybe I can try further away from the core
<egg|anbo|egg> smol field but still less silly than PHAT :-p
<egg|anbo|egg> PHAT?
<egg|anbo|egg> huh it was not added?
<egg|anbo|egg> !acr -add:PHAT Panchromatic Hubble Andromeda Treasury
<galois> Definition added!
<_whitenotifier-d13c> [Principia] Failure. Build finished. - http://casanova.westeurope.cloudapp.azure.com:8080/job/Principia/4346/
<egg|anbo|egg> aargh condensation on the detector, I should have put it in temperature earlier
<egg|anbo|egg> polar alignment is looking nicer today thuogh
egg|cell|egg has joined #kspacademia
* egg|anbo|egg stares at the very slowly receding dew on the sensor
* egg|anbo|egg stares at the passage of time and the short night
* raptop suggests a collaboration with ESO