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> … one of the other grad students just compared me to nomal O_o | <ferram4> I shall beat my problems to death with an engineer.
<bofh>
soundnfury: transponders are light, so are solar panels
<soundnfury>
bofh: yeah but when you have a lot of them, they add up
<soundnfury>
also remember that the sat has to have injection thrusters, F9 only takes it to GTO-1800 or so, so there's a bunch of fuel (probably hydrazine) on board
<soundnfury>
plus stationkeeping and attitude control
<soundnfury>
maybe thermal control systems as well
<soundnfury>
batteries for the ecliptic blackouts
<bofh>
like, how much stationkeeping is necessary on a geosynchronous sat? or is this one supposed to also be geostationary too?
<UmbralRaptor>
Sat has to have enough fuel to circularize, right?
<UmbralRaptor>
Plus some years of station keeping plus graveyard orbit.
<UmbralRaptor>
hrm. Pole, white, brown, white (equator), brown, white, pole
<UmbralRaptor>
This cat may need alignment. Blarg.
<UmbralRaptor>
Floaters can be mistaken for the GRS >_>
* UmbralRaptor
ma or may not be seeing detail in the bands.
* Ellied
thought UmbralRaptor was looking at resistors for a moment.
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<UmbralRaptor>
Jovian resistors
<UmbralRaptor>
!wpn -add:adj Jovian
<Qboid>
UmbralRaptor: Adjective added!
<UmbralRaptor>
!wpn -add:adj Selenian
<Qboid>
UmbralRaptor: Adjective added!
<UmbralRaptor>
!wpn -add:adj Terran
<Qboid>
UmbralRaptor: Adjective already added!
<UmbralRaptor>
!wpn -add:adj Saturnian
<Qboid>
UmbralRaptor: Adjective added!
<UmbralRaptor>
!wpn -add:adj Martian
<Qboid>
UmbralRaptor: Adjective added!
<UmbralRaptor>
!wpn -add:adj Venusian
<Qboid>
UmbralRaptor: Adjective added!
<UmbralRaptor>
!wpn -add:wpn resistor
<Qboid>
UmbralRaptor: Weapon already added!
<UmbralRaptor>
Ellied: misusing university equipment (8" Celestron SCT, with 40 mm, 26 mm, and 17 mm plossl eyepieces)
<Ellied>
the SPS chapter here had a "telescope phase" (according to my prof) a couple years back. We have a good few lying about. Some of them might even be pretty good, it's just that, well, we're in Chicago. B(
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<egg|work|egg>
* Ellied wonders if whitequark goes around telling people their C is "a little rusty" << I'm confused by this sentence; does "their" refer to whitequark or people
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<soundnfury>
egg|zzz|egg: are your numbers really R u iR, or are they (R / 2πZ) u iR?
<soundnfury>
(apologies for insufficiently Unicode)
Technicalfool is now known as tfsleep
<egg|cell|egg>
Depends I think
Thomas|AWAY is now known as Thomas
<Ellied>
egg|cell|egg: to whitequark
<egg|cell|egg>
!Wpn ellied
* Qboid
gives ellied a hypergolic yxala
<egg|cell|egg>
Hah
<Ellied>
so if Jupiter goes white brown white brown white, that means it has a resistance of 9190 Ω. Except white isn't usually a tolerance band.
<Ellied>
maybe it's gray? In which case they're probably all gray, so that's 8180 Ω ±0.05%
<Iskierka>
what's the albedo of the white areas? given pictures are usually adjusted to bring out maximum brightness of features so shown colours are unreliable
<Ellied>
they're probably pretty high, given that they're clouds.
<Ellied>
I bet they'd look white in person, but the brown bands would look pretty light too.
<Iskierka>
its geometric albedo is apparently only 0.538 total. so they might be somewhat off-white (with an actual white to compare to)
<Ellied>
otoh, the moon's albedo isn't especially high and it looks pretty bright from Earth.
<Iskierka>
yeah, hence with something to compare to. Even ISS's "white" radiatiors are pretty much exactly 50% grey by albedo
<Iskierka>
stuff in direct sunlight with no true reference point gets washed out very easily to pretty much white
<Ellied>
maybe we should include the poles as bands, so that gives us brown-white-brown-white-brown-white-brown, or 19191x10⁹ Ω ± 1%.
<Ellied>
~19 teraohms seems marginally more appropriate for a planet than ~8k
<Ellied>
;wa resistance of jupiter
<kmath>
Ellied: Wolfram couldn't understand your gibberish
* Iskierka
wasn't aware 7-band resistors exist. Or is it extensible for adding as many decimals as you want?
<Ellied>
I'm extrapolating from 4→5 band resistors
<Ellied>
when you go from 4 to 5, you keep the multiplier and tolerance as the last two and add digits, so I assume that's what you would do if you had more bands.
<Ellied>
although I mean, if it's 1%, those last two digits are hardly significant
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<egg|work|egg>
!wpn Iskierka
* Qboid
gives Iskierka a killing NaN
<egg|work|egg>
!wpn Ellied
* Qboid
gives Ellied a molybdenum thermometer
<egg|work|egg>
!u ߷
<Qboid>
U+07F7 NKO SYMBOL GBAKURUNEN (߷)
<egg|work|egg>
!seen whitequark
<Qboid>
egg|work|egg: I haven't seen the user whitequark yet.
<egg|work|egg>
uh
<egg|work|egg>
!seen Ellied
<Qboid>
egg|work|egg: I last saw Ellied on [16.05.2017 14:41:45] in #kspacademia saying: "although I mean, if it's 1%, those last two digits are hardly significant"
<egg|work|egg>
!seen whitequark's cat
<Qboid>
egg|work|egg: I haven't seen the user whitequark's cat yet.
<egg|work|egg>
Thomas: why hasn't Qboid seen whitequark O_o
<Thomas>
Because I added a limit, it can only look 10000 messages in the past... so he probably didnt talk for a while?
<Thomas>
Had to do that, because the queries got utterly slow
<Iskierka>
why not a set storing the most recent messages of people updated as they come in
<Iskierka>
then just query that set
<Ellied>
Yeah, that's what Lizzie did. It just maintained a list of every user it had seen with their last message.
<Ellied>
I think I burned an SD card because I was dumb on two counts: one, I had it rewrite the file immediately every time it was updated; 2) I used a card without wear-leveling.
<Ellied>
some people will say that using an SD card at all was dumb but I like using an RPi as a botserver :D
<SnoopJeDi>
If it's stupid and it works, it's (maybe) not stupid \o/
<Iskierka>
can an RPi drive enough power for an SSD on the USB?
<Iskierka>
(can it boot off USB?)
<Iskierka>
sillier version: let the bot's logging and such be stored on a network server
<Ellied>
The Pi3 can boot off USB, but only by setting a bit on the BCM which is not reversible IIRC. Doing so makes it unable to boot from SD again, so I haven't done it with any of my Pis.
<Iskierka>
... that seems silly? o.O
<Ellied>
although that's beside the point because it's easy to just put a minimal system on an SD and then have it mount the rest from USB post-boot.
<Ellied>
Blame Broadcom.
<Ellied>
the BCM the RPi uses is honestly pretty shitty, there are lots of better alternatives. I think that's pretty much the main reason why there are so many RPi competitors, just because so many people went "seriously? they did that well with *that* chip? We can do way better!"
<Iskierka>
and then they can't because they're not meeting the popular standard everyone's figured out
<Ellied>
or they're hoping to turn a profit quickly, while the RPF gained so much ground by being a nonprofit and keeping their prices basically as low as they can be.
<Ellied>
so there are two types of RPi competitor: "almost as good for $40" and "way better for $70"
<Ellied>
that's not technically true in all cases but it's close
<Iskierka>
meanwhile I'd consider throwing £9 at another zero w and the most annoying part would be the extra £9 for another SD card
<Iskierka>
so that would be a considerably more attractive idea than the knockoffs that you'd have to relearn and probably pay more for
<Ellied>
yup.
<Ellied>
but the alternative boards also have things like Mali GPUs that don't suck as bad as the VideoCore does (mostly because they aren't so opaque), faster chips in general, and also sometimes nice GPIO features like a built-in ADC or more serial interfaces.
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<Iskierka>
which could be nice when you know you need/want those but to an average user who just wants to get started playing, rpi is the most supported and cheapest and generally has enough. So they're just making themselves more specialised
<Iskierka>
if a company could make themselves completely rpi-compatible at a base level but just provide extensional features as a competitive price, they might get somewhere decent. Everyone else is gonna struggle
<Ellied>
yeah, that's pretty much it.
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<egg|zzz|egg>
sarbut sarbian
<egg|zzz|egg>
!wpn UmbralRaptor
* Qboid
gives UmbralRaptor a technetium fermium falconet
<Ellied>
!wpn
* Qboid
gives Ellied a harmful pigeon-like infimum
<egg|zzz|egg>
... clearly it should be used to indicate comments, FORTRAN-style
<Iskierka>
in consolas the first is formatted much more like the second (which wordmark.it tells me is fairly consistent)
<Iskierka>
(and which can also fetch consolas so may be a neat website to remember)
<egg|zzz|egg>
!wpn Iskierka
* Qboid
gives Iskierka a honed COME FROM
<egg|zzz|egg>
Iskierka: any news from the iskiedog?
<Iskierka>
?
Thomas is now known as Thomas|AWAY
<Iskierka>
Maybe I didn't mention, the dog we had got put down. He managed to prolapse a spinal disk in a fall and had bone calcification - would require a huge amount of treatment for both and not heal well, so for quite a problematic dog it was the sensible thing to do
<egg|zzz|egg>
ow
<Iskierka>
like he REALLY didn't like being picked up (would attempt to bite), yet literally couldn't walk, and it'd be months of rehab getting him outside only with assistance to manage toilet issues. Wasn't going to go well and would've been very expensive
<kmath>
<ObservatoryCats> Please tweet me the best photos of your calicos, calibies, tortoiseshells, and torbies. Have to survive heliophysics lunch tomorrow somehow!
<UmbralRaptor>
;8ball Try to get the Russian cat working?
<kmath>
UmbralRaptor: Outlook good
<UmbralRaptor>
blarg.
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<UmbralRaptor>
Why can't more amature scopes come on equitorial mounts. Also why can't the fittings for OTAs, finders, etc be standardized.
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<soundnfury>
UmbralRaptor: because the military-astronomical-industrial complex wants you to suffer, so that they can sap and impurify your precious bodily whatsits. Also bearings, and bears.
<UmbralRaptor>
Uh, about that last one.
<UmbralRaptor>
soundnfury: You do know that MSU's motto is "bear up" right?