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
<iximeow> no fungal ccd pls
<SnoopJeDi> !wpn -add:adj fungal
<galois> Entry already exists!
<egg|laptop|egg> OK put a bag of frozen mashed potatoes on the mount and oriented the scope so that is in the airstream, now back to -29
<raptop> !wpn -add:adj mycolic
<galois> Added adj 'mycolic'
<egg|laptop|egg> I should try raising the potatoes and insulating them from the mount
<egg|laptop|egg> -29.6
<egg|laptop|egg> gaaaah -29.5
<egg|laptop|egg> how am I going to take those darks
<raptop> accept a systematic error in the noise correction?
<egg|laptop|egg> raptop: re. your recommendation that the instrument stay affixed to the OTA for dark frames, why is that?
<raptop> I'm assuming that moving the instrument could change something
<egg|laptop|egg> but how would it change the dark signal
<egg|laptop|egg> the flat, sure
<egg|laptop|egg> if I can I might be able to reach -30 by putting the CCD right on top of the potatoes
<egg|laptop|egg> but vaguely sniffing at it from 10 cm is not cutting it
<egg|laptop|egg> so basically the question is whether detaching the CCD from the OTA will change the dark signal more than 1 K will
* egg|laptop|egg meows at ixi
<iximeow> i have not rigorously investigated but i have not noticed a different pattern in hot pixels etc with sensor on OTA or off
<egg|laptop|egg> hm.
<iximeow> one reason to measure darks on the OTA is if you have some source of light/internal reflection from something nearby (not quite perfect fitting on an OAG f.ex)
<raptop> I'd defer to ixi's experience
<iximeow> so then your dark might subtract that out, but i'd try to fix that rather than calibrate it out
* egg|laptop|egg plonks the potatoes on the OTA and hopes that cools the whole thing eventually
* egg|laptop|egg also points the CCD towards the outside and the scope towards the room hoping that the temperature gradient is that way
<egg|laptop|egg> still -29.5
<egg|laptop|egg> -29.3
<egg|laptop|egg> iximeow: "i'd try to fix that rather than calibrate it out" << as in that would not be a reason why you would prefer darks on the OTA?
<raptop> Sky cold and dark. Ceiling warm and bright (in mid IR)
<egg|laptop|egg> raptop: yeah though mostly things are convective rather than radiative here
<iximeow> o_o wait is -29.3 your CCD temperature?
<egg|laptop|egg> yes
<iximeow> nice
<egg|laptop|egg> except my lights were taken yesterday when it was freezing
<egg|laptop|egg> so at -30
<egg|laptop|egg> and I cannot reach -30 now
<iximeow> and yes, that would not be a reason i prefer darks on the OTA
<iximeow> oh, yes, that's a problem
<iximeow> -29.something is probably close enough to not sweat it
<egg|laptop|egg> hmm
<raptop> I guess for the future, go with -20 (maybe higher in summer)
<egg|laptop|egg> yeah I usually go for -20
<iximeow> i think i am demonstrably laziest with calibration though
<iximeow> so very loose "good enough" bars
<egg|laptop|egg> also with the scope now pointing inwards I am slightly worried that it might pick up light from my laptop
<egg|laptop|egg> -29.5
<egg|laptop|egg> (not sure how good the lid is)
<egg|laptop|egg> fairly thick but does it leak on the sides?
<egg|laptop|egg> -29.6
<egg|laptop|egg> wind is starting to blow
<egg|laptop|egg> might help it
<raptop> Oh, hey. Headlines from a film that starts with an apocalypse. https://twitter.com/WEATHERISHAPPEN/status/1243698178777665537
<kmath> <WEATHERISHAPPEN> https://t.co/j38yihv4i6
<WeylandsWings> UmbralRaptop: is that serious
<raptop> The account is normally serious, albeit in a stilly style
<egg|laptop|egg> -29.5
<raptop> !wpn egg|laptop|egg's OTA
* galois gives egg|laptop|egg's OTA a vectorized saber
<raptop> !wpn -add:wpn hammer
<galois> Entry already exists!
<raptop> !wpn -add:adj Lucerne
<galois> Added adj 'Lucerne'
<raptop> !wpn -add:wpn partisan
<galois> Entry already exists!
<raptop> !wpn -add:wpn halberd
<galois> Entry already exists!
<raptop> !wpn -add:wpn spontoon
<galois> Added wpn 'spontoon'
<raptop> !wpn -add:wpn spetum
<galois> Added wpn 'spetum'
<raptop> !wpn -add:wpn ranseur
<galois> Added wpn 'ranseur'
<raptop> !wpn -add:wpn trident
<galois> Added wpn 'trident'
<raptop> !wpn -add:wpn spork
<galois> Entry already exists!
<raptop> !wpn -add:wpn foon
<galois> Added wpn 'foon'
<raptop> !wpn -add:wpn bardiche
<galois> Added wpn 'bardiche'
<raptop> !wpn -add:wpn brandistock
<galois> Added wpn 'brandistock'
<raptop> !wpn -add:wpn glaive
<galois> Entry already exists!
<raptop> !wpn -add:wpn hasta
<galois> Added wpn 'hasta'
<raptop> !wpn -add:wpn voulge
<galois> Added wpn 'voulge'
<raptop> !wpn -add:wpn yari
<galois> Added wpn 'yari'
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<egg|laptop|egg> !wpn UmbralRaptop
* galois gives UmbralRaptop an IDE round polyhedron
<raptop> !wpn egg|laptop|egg
* galois gives egg|laptop|egg a vanquished fungi
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<raptop> Any luck with the darks?
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<egg|laptop|egg> -29.7 now
<egg|laptop|egg> raptop: yeah, now filling my disk with darks
<egg|laptop|egg> have an hour of them already
<egg|laptop|egg> (30 frames)
<raptop> uh
<raptop> that's probably enough
<egg|laptop|egg> raptop: hm, lots of read noise so I would like the darks not to add more
<egg|laptop|egg> raptop: see https://cdn.discordapp.com/attachments/533816279165960192/692958146528018432/m101_120s_uncalibrated.png, obvious dark signal but also a tonne of noise, smol field means low light
<_whitenotifier-d13c> [Principia] Growflavor commented on issue #2457: Keep track of the vessels when they are managed by KSP - https://git.io/JvQet
<egg|laptop|egg> -29.8
<egg|laptop|egg> OK have 2 hours of darks now
<egg|laptop|egg> enough darking
<egg|laptop|egg> potatoes go back to the freezer
<kmath> <Damkyan_Omega> #Leschatsdupèreconnard ⏎ ⏎ Je vais mettre ici en dessous la liste de mes fils ou threads sur les chats
<kmath> <Damkyan_Omega> L'étude dont je vais parler ce soir s'appelle: "Temperature sensitivity of the paw of the cat: a behavioural study"… https://t.co/NOJiNah8n9
<egg|laptop|egg> aargh SIPS is failing to align my frames
<egg|laptop|egg> iximeow: how do you stack your FITS files
<iximeow> egg: either deepskystacker or uhh
<iximeow> well, fits i don't
<iximeow> (i record to either raw byte arrays or png)
<iximeow> i should figure out using fits but It Works and i'm lazy
<egg|laptop|egg> I think my 2 min exposures were too short, the noise confuses SIPS and it has trouble finding stars for alignment...
<raptop> unsure if read noise, shot noise, or something else
* raptop wonders if astropy has anything for stacking FITS
<raptop> IRAF might, but then you're using IRAF
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<_whitenotifier-d13c> [Principia] pleroy opened issue #2508: Liquid-fuel engines should lose angular momentum - https://git.io/JvQLM
<_whitenotifier-d13c> [Principia] pleroy assigned issue #2508: Liquid-fuel engines should lose angular momentum - https://git.io/JvQLM
<_whitenotifier-d13c> [Principia] pleroy opened pull request #2509: Make a trace less verbose - https://git.io/JvQtC
<_whitenotifier-d13c> [Principia] Pending. Build queued… - 
<_whitenotifier-d13c> [Principia] Pending. Building… - http://casanova.westeurope.cloudapp.azure.com:8080/job/Principia/4189/
<_whitenotifier-d13c> [Principia] Success. Build finished. - http://casanova.westeurope.cloudapp.azure.com:8080/job/Principia/4189/
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<_whitenotifier-d13c> [Principia] eggrobin labeled pull request #2509: Make a trace less verbose - https://git.io/JvQtC
<egg|laptop|egg> iximeow: huh that deepskystacker thing is french
<egg|laptop|egg> well its website is .fr and the author’s address is .co.uk
<egg|laptop|egg> The two human languages,
<egg|laptop|egg> iximeow: with 2-by-2 binning I can manage to get SIPS to understand the stars
<egg|laptop|egg> one frame with a sat? trail
<egg|laptop|egg> !u 𒁹𒈩𒋛𒅀𒁹𒐏𒁹
<galois> 𒁹: U+12079 CUNEIFORM SIGN DISH
<galois> 𒈩: U+12229 CUNEIFORM SIGN MES
<galois> 𒋛: U+122db CUNEIFORM SIGN SI
<galois> 𒅀: U+12140 CUNEIFORM SIGN I A
<galois> 𒁹: U+12079 CUNEIFORM SIGN DISH
<galois> 𒐏: U+1240f CUNEIFORM NUMERIC SIGN FOUR U
<galois> 𒁹: U+12079 CUNEIFORM SIGN DISH
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<egg|laptop|egg> getting some weird colour artifacts on the centres of stars
<egg|laptop|egg> is that just different optical characteristics in the three bands?
<egg|laptop|egg> but then there doesn’t seem to be much chromatic aberration (the scope is pretty good at that)
<egg|laptop|egg> oh, is that the radii of the airy disks in the three bands
<egg|laptop|egg> yeah looks like that is it
<egg|laptop|egg> (also my focus probably wasn’t great)
<egg|laptop|egg> iximeow: how do you focus your scope
<iximeow> egg: bahtinov mask and "that looks about as good as it'll get tonight" (i would like to do something more robust one day, alas)
<iximeow> looking at the images i think you're right to suspect focus
<iximeow> oh and in the light i can see a bit of drift which probably doesn't help
<UmbralRaptop> random thought: could the artifacts be from the pixel locations varying between colors?
<egg|laptop|egg> nah this is binned
<egg|laptop|egg> iximeow: I don’t have a bahtinov mask,
<egg|laptop|egg> I have a spider though
<egg|laptop|egg> but focusing with spider spikes still leaves me plenty of uncertainty
<egg|laptop|egg> might be able to do another round of imaging in the night from sunday to monday
<iximeow> focusing with spider is good
<iximeow> my fallback plan with focusing is to find a bright star near my target and focus with something looping ~100ms exposures
<iximeow> fiddle with focus until star appears minimized
<egg|laptop|egg> I did spider focus but that meant long exposures which also doesn’t improve the process
<egg|laptop|egg> maybe i should have been less dumb and pointed at a brighter star,
<iximeow> 8D
<egg|laptop|egg> hm
<egg|laptop|egg> but monday I have a food delivery so I need to be awake…
<egg|laptop|egg> it’s in the afternoon though
<egg|laptop|egg> should I redo the pinwheel or do the whirlpool
<egg|laptop|egg> !choose M101, M51
<egg|laptop|egg> ;choose M101, M51
<egg|laptop|egg> ;choose M101, M51
<kmath> egg|laptop|egg: M51
<kmath> <JanFreedman> This is Carcinosoma, a giant marine sea scorpion that lived in the warm seas around 440 million years ago. Some, li… https://t.co/XY8ACJPDL7
<egg|laptop|egg> !choose M101, M51
<galois> egg|laptop|egg: Your options: M101| M51. My choice: M51
<egg|laptop|egg> <iximeow> in the light i can see a bit of drift which probably doesn't help
<egg|laptop|egg> alignment is pretty decent though
<egg|laptop|egg> and drift is smol within one frame, see the full pixel range image
<iximeow> was that just a one-off bad frame from tracking error then? (i was curious about why it wasn't similarly apparent in the stacked one)
<egg|laptop|egg> iximeow: oh you mean the noisier image in that album?
<egg|laptop|egg> iximeow: that is a rejected frame
<egg|laptop|egg> note the trail
<iximeow> gotcha
<egg|laptop|egg> there is a very cute diffraction pattern in the blue channel of the stack
<egg|laptop|egg> uploading that separately
<egg|laptop|egg> I should make tea
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<egg|laptop|egg> note to self, do not save a FITS file with the .jpg extension when trying to export a .jpg file
<iximeow> :think:
<_whitenotifier-d13c> [Principia] pleroy closed pull request #2509: Make a trace less verbose - https://git.io/JvQtC
<_whitenotifier-d13c> [Principia] pleroy pushed 3 commits to master [+0/-0/±21] https://git.io/JvQCj
<_whitenotifier-d13c> [Principia] pleroy 0b5365d - Less verbose trace.
<_whitenotifier-d13c> [Principia] pleroy e9b62a4 - Merge branch 'master' into FrobeniusDebug
<_whitenotifier-d13c> [Principia] pleroy 6c034d3 - Merge pull request #2509 from pleroy/FrobeniusDebug Make a trace less verbose
<egg|laptop|egg> iximeow: blue channel, the star below the galactic core has very obvious diffraction rings
<egg|laptop|egg> iximeow: I should probably post the link, derp; https://photos.app.goo.gl/1v5b6iCajfHhW55k9
<iximeow> oooh nice!
<iximeow> i've never actually seen diffraction rings myself..
<egg|laptop|egg> iximeow: yeah but I wonder how much those are just due to my shit focusing vs. proper Airy
<egg|laptop|egg> (note that it takes 64 120 s exposures to see those diffraction rings like that, so it is not like they are very evident when operating the scope :-p)
* raptop is amused at the nuclear diffraction ring
<egg|laptop|egg> which one?
<egg|laptop|egg> oh
<egg|laptop|egg> yes
<raptop> *nuclear*
<egg|laptop|egg> yes
<raptop> Oh, hey. M 51 is a Seyfert 2
<egg|laptop|egg> but yeah I did my focusing on a nearby bright star (UMa η) but that still requried nontrivially long eggsposures to see spider spikes
<egg|laptop|egg> hence trickiness of adjusting focus
<egg|laptop|egg> raptop: should I do M51 tomorrow
<egg|laptop|egg> or take another pass at 101
<raptop> Silly galaxy modeling: PSF for the nucleus, de Vaucoleurs for the bulge, Sersic(sp) for the disk
<raptop> I'd suggest switching things up and doing M51
<egg|laptop|egg> (and definitely doing that at -20 °C so as not to get screwed by ambient temperature again,)
<_whitenotifier-d13c> [Principia] Growflavor edited a comment on issue #2457: Keep track of the vessels when they are managed by KSP - https://git.io/JvQet
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<_whitenotifier-d13c> [Principia] DarthPointer commented on issue #2507: Undocking causes gamecrash - https://git.io/JvQBB
<_whitenotifier-d13c> [Principia] DarthPointer edited a comment on issue #2507: Undocking causes gamecrash - https://git.io/JvQBB
<_whitenotifier-d13c> [Principia] DarthPointer opened issue #2510: No metions of Persistent Rotation - https://git.io/JvQBK
<_whitenotifier-d13c> [Principia] eggrobin commented on issue #2510: No metions of Persistent Rotation - https://git.io/JvQBi
<_whitenotifier-d13c> [Principia] eggrobin closed issue #2510: No metions of Persistent Rotation - https://git.io/JvQBK
<_whitenotifier-d13c> [Principia] eggrobin labeled issue #2510: No metions of Persistent Rotation - https://git.io/JvQBK
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<_whitenotifier-d13c> [Principia] DarthPointer commented on issue #2510: No metions of Persistent Rotation - https://git.io/JvQRJ
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<raptop> !choose order surgical masks that will not be in until at least may|search for N95s even though amazon doesn't even bother to try to show them anymore|despair
<galois> raptop: Your options: order surgical masks that will not be in until at least may, search for N95s even though amazon doesn't even bother to try to show them anymore, despair. My choice: despair
<egg|laptop|egg_> raptop: scarf?
<egg|laptop|egg_> or do you have a respirator/gas mask lying around
<egg|laptop|egg_> i think I have one at ANBO
<raptop> none of the above
<egg|laptop|egg_> (not sure I have activated coal to put in the gas mask though)
<egg|laptop|egg_> (it is quite old, it does not use standard cartridges)
<raptop> "Best if used by 1917-06-01"
<egg|laptop|egg_> raptop: nah I don’t think it is that old
<egg|laptop|egg_> there might be other things here that are
<egg|laptop|egg_> !choose work on the Akkadian IME|review a solution of Arnold’s equations for rigid body motion|sleep
<galois> egg|laptop|egg_: Your options: work on the Akkadian IME, review a solution of Arnold’s equations for rigid body motion, sleep. My choice: review a solution of Arnold’s equations for rigid body motion
<egg|laptop|egg_> ;choose work on the Akkadian IME|review a solution of Arnold’s equations for rigid body motion|sleep
<kmath> egg|laptop|egg_: sleep
<egg|laptop|egg_> stabbity choose work on the Akkadian IME|review a solution of Arnold’s equations for rigid body motion|sleep
<raptop> egg|laptop|egg_: I choose work on the Akkadian IME
<egg|laptop|egg_> 𒀯
* egg|laptop|egg_ meows at a cat
<raptop> the cat is confused
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<egg|laptop|egg_> !choose coffee|no coffee
<galois> egg|laptop|egg_: Your options: coffee, no coffee. My choice: coffee
<egg|laptop|egg_> ;choose coffee|no coffee
<kmath> egg|laptop|egg_: no coffee
<egg|laptop|egg_> hm