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00:03
Answered.
Heavens Above gave the right answer.
> 1700 to about 1300
is that local time?
(solar time?)
I see now it's GMT
I guess it doesn't matter as long as there's no DST involved
It was 0 latitude, so it's probably about local time.
00:19
well the guy is from Novosibirsk and Russia has abolished daylight saving time anyway
I was just thinking that sometimes you'd get odd results in tables if you don't consider that local time might not be synchronized with solar time
00:33
Time to start using my new SSD!
00:43
Wooo! A leisurely drive through the state of Solid.
 
13 hours later…
13:52
Morning Everyone! Found a cool site to track satellites!
 
1 hour later…
15:11
@JukEboX And a Link is?
15:22
Tracking the garbage can that is the DPRK satellite
there's loads of trackers like these, try e.g. satflare.com/track.asp
if you double click on the skymap it'll show you everything that's currently in transit close to where you clicked (set your position with a double click on the world map)
and it has decay predictions
16:25
@geoffc Tiadong? hahaha cute
16:37
Steve Feldman on February 9, 2016
What's the deal with ad blockers?
17:12
@TildalWave I dunno how to spell it. Its' all greek to me.
17:38
@geoffc I mentioned it in the comment before, you could always assume I spelled it right and copy :P
dongs ... in spaaaaaceeee!! :))
@StackExchange because once you learn not to care, you get good at it :P
@TildalWave Hot dong!
@TildalWave De-dongled it.
:)
You know there's a wiki page on what "plans" there are? It's not exhaustive and I've seen other suggestions, but it's not too bad either
18:29
Bolden's "State of NASA" address is now live youtube.com/watch?v=HDh4uK9PvJU
 
2 hours later…
20:35
Chat silent for two hours, then I get a notification, but the only thing here is (removed)
@PearsonArtPhoto you might wanna use that "citation needed" post annotation more often, so we avoid bickering in comments why something was downvoted for having to take poster's word for whatever is being discussed in their answers
@Hohmannfan I didn't ping you, and I deleted that previous post of mine here because the post it linked to was deleted by its author
 
2 hours later…
22:42
Howdy
Could anyone answer a question?
@SirCumference OK
That is what SE is for :P
Well, is the absolute magnitude of a planet actually relative, since it differs depending on the phase angle?
Both that and distance, so yes
So wouldn't it be misleading to call it "absolute"?
At least for objects that don't emit their own light
Not really, in the same way that absolute temperature is not misleading.
Absolute is just a fixed scale
22:49
But isn't apparent magnitude?
Yeah, distance will affect apparent magnitude.
but not absolute, I was a bit too fast there
Right.
So...is absolute magnitude still absolute then?
I've only ever looked at absolute magnitude of stars.
I don't really know how that works with planets.
22:51
It's based on phase angles (the angle at which light leaves the Sun, reflects off the surface of the planet and then meets your eyes)
Right, and that makes sense... but I'm not sure if that is (or should) be taken into consideration.
I've just never looked at stuff like that with planets.
Yeah, it's more confusing
Since it seems to be completely different
I bet T probably knows. :P
All right, second question: is geometric albedo constant or does it change as the planet rotates? Also, is bond albedo constant?
By "constant", I mean it doesn't change when the planet rotates
I'm not even going to be able to participate in this one. :P
22:54
That does not change, that is for sure
Bond or geometric?
Both of them
Really?
Isn't geometric albedo the brightness when illumination comes from directly behind the observer?
So wouldn't it make a difference as the planet rotates, and light reflects off land, then ice, etc.?
But it averages out over one revolution
Oooh
So it's the average!
So wait, how is it different from Bond albedo?
23:01
Geometric is reflection towards the light source, Bond is in all directions
Oh yeah
All right, thanks
Wait, then what is geometric good for? Wouldn't Bond give us a better idea of the temperatures and surfaces of planets?
That is correct
Geometric predicts what you actually observes
All right, and what would it tell us?
23:06
"If I shine a bright light at this object, how bright would the surface look like from my point of view?"
So geometric and bond have two completely different uses?
yeah...
And confusing
And what would we use that data for?
How would it tell us about the planet?
Besides how shiny it is?
23:08
Geometric is "how shiny". Bond for calculating things like the surface temperature
Er, okay...
But do we need to know how shiny something is? Would it tell us the distance, or anything?
Does it help us find the Bond albedo?
They are two different measures, but not independent
Any formula relating them?
Only for perfect Lambertian surfaces and that kind of things. e.g. Not for any real objects. Then you do only have approximations.
Welcome to the insane world of optics!
Wait wait, if we're only using Lambertian surfaces, how does geometric albedo help us get any info in the slightest?
It's purely idealistic
23:14
But approximations can be good too
Yeah, but no surface can reflect and diffuse light like a Lambertian surface
Sure, but it is like using the black body radiation laws for approximating real emission.
Or patched conics for the n-body problem
So...geo albedo only tells us how a Lambertian surface would reflect light at that distance?
23:16
No, no, geo is a real thing
And Bond?
Is a real thing too
You can not just be sure how they are related
OOOooooohhhh
Unless you have a Lambertian surface...
23:17
Or complete knowledge of the optical properties of the object in question
Ahhh...okay, makes sense :D
Thanks!
Ya actually use this stuff? I just read it because it's interesting.
I am active with worldbuilding and that kind of stuff. Then you must know your radiation laws. (for a hard science approach anyway)
Huh
Interesting
Imma look into it
have you checked out SE worldbuilding?
23:21
Sure there are a lot of odd stuff, but some of the planetary science stuff is interesting
I've only been active on astronomy so far
For how long?
2 months I think
you don't ask an astronomer that question!
Oh wow, 4, nvm
@TidalWave Why not?
23:24
see? redshift...
And it is quite relative anyway...
I'm planning on majoring in astronomy in college
Another young one! Seems like there are a lot of us
17
Ya?
Holy crud
Ya know about this stuff and you're 16?
23:26
I am a strange person
No, dude, that's awesome
also a scandinavian
long winters ;)
Sigh...I've got a ton to learn
@TildalWave Long cold winters. Long enough that the reindeer start looking mighty appealing.
Darn laplanders...
Ya got a favorite type of astronomy? Stellar, cosmology, observational?
23:27
(Is that offensive to Scandanavians? If not, what is? )
hahaha
@TildalWave Work here is done. Drop in, make someone laugh. Step away.
@geoffc It is OK, I suppose...
@Hohmannfan Ok, so what would be NOT ok to call/say to a Scanadavanian? :) Best to understand your ethnic insults and when to use them, when not to use the,.
@geoffc Interesting spelling of Scanadavanian :)
2
23:30
Was it insulting? Or just makes me look foolish? (Need to understand the parameters).
Not insulting
so it's the other option :))
That kind of thing, like acting like you do not know about something in a humoristic way is very OK. It is much worse if you pretend to know a lot about for instance Norway, without actually being any good at it
Dang.
Caught.
"Are you from Oslo?" Is a bit of a frustrating question to get
23:33
my knowledge about Norway is on a need to know basis
@TildalWave My normal state of being - looking foolish.
@TildalWave I pine for the fjords.
@Hohmannfan How about "You are from Norway? From Copenhagen?"
@geoffc Nooooo!!!!
some of the ancestors would be tho
mind, some were here too
@Hohmannfan ScandalNavian? Better?
23:35
@TildalWave You are from Serbia or something?
geez no
@Hohmannfan He is from Sorkova. Fictional city in the Avengers series.
they were there too?
He is not really here, he is a figment of our collective imagination.
Glory to Arztotzka!
23:37
@Hohmannfan All hail Vectron!
319760, 49568 !
@geoffc I'm from the telepathic planet Pluke!!
Dang it! All the Mitchell and Webb Look episodes of Vectron are blocked in the US.
One of you furiners, look on Youtube for Mictchell webb vectron and get back to me.

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