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?
<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
<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
<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 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