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by Watsisname
08 Dec 2022 13:17
Forum: Science and Astronomy Discussions
Topic: Astrophotography
Replies: 661
Views: 202753

Re: Astrophotography

Yes the total solar eclipse lasts a mere few minutes but when I asked dpreview photographers they said they meant that total lunar eclipses are much darker and harder to achieve autofocus on and require higher ISO and longer shutter speeds. The outer parts of the corona require similar or even long...
by Watsisname
08 Dec 2022 00:28
Forum: Science and Astronomy Discussions
Topic: Astrophotography
Replies: 661
Views: 202753

Re: Astrophotography

Caught the occultation of Mars by the full Moon tonight, through thin clouds and high winds. Pretty neat. I have seen bright stars occulted before, but not a planet. :)

Image
by Watsisname
04 Dec 2022 12:56
Forum: Science and Astronomy Discussions
Topic: Astrophotography
Replies: 661
Views: 202753

Re: Astrophotography

Wat, I took pictures of the eclipse too, but my focal lengths were 600mm EFL on my M43 gear....what focal length and what kind of exposure would be needed to get the moon and Uranus in the same frame?  I tried to do it handheld and I was using some high ISO ..... a typical shot for me was ISO 4000 ...
by Watsisname
04 Dec 2022 12:49
Forum: Off-topic Discussions
Topic: Coronavirus (COVID-19) Thread
Replies: 638
Views: 147595

Re: Coronavirus (COVID-19) Thread

Covid activity is relatively low here at the moment. But what isn't low is influenza. Holy ***. Already double the peak of a typical year (while 2020/2021 were very low due to pandemic restrictions) and rising fast . But we expected this because of how it behaved in the southern hemisphere (especial...
by Watsisname
18 Nov 2022 12:11
Forum: Science and Astronomy Discussions
Topic: Science and Astronomy Videos
Replies: 530
Views: 172725

Re: Science and Astronomy Videos

Wow.  I think this is 3b1b's best video yet.

by Watsisname
08 Nov 2022 08:32
Forum: Science and Astronomy Discussions
Topic: Astrophotography
Replies: 661
Views: 202753

Re: Astrophotography

Another nice total lunar eclipse here. I tried compositing a few shots to show the shape and color gradation of Earth's shadow. :) https://i.imgur.com/HrUo2P9.jpg There was a bit of déjà vu as well -- it's the second time I've seen one where Uranus was so close to the Moon (just 1.5° away). https://...
by Watsisname
05 Nov 2022 17:40
Forum: Science and Astronomy Discussions
Topic: Science and Astronomy Videos
Replies: 530
Views: 172725

Re: Science and Astronomy Videos

A neat math story/mystery, explored by 3b1b.

by Watsisname
03 Nov 2022 03:02
Forum: Science and Astronomy Discussions
Topic: Asteroids, meteors, and meteorites
Replies: 158
Views: 54524

Re: Asteroids, meteors, and meteorites

That is incredible. 
by Watsisname
26 Oct 2022 19:59
Forum: Science and Astronomy Discussions
Topic: Science and Astronomy News
Replies: 992
Views: 326769

Re: Science and Astronomy News

If we can have uncertainty about biosignatures in the planets of our local solar system, how much can we then trust signs of biosignatures in exoplanets when that kind of data becomes available? Well, the original detection was very far from a sure thing, which was way too frequently glossed over o...
by Watsisname
26 Oct 2022 01:10
Forum: Science and Astronomy Discussions
Topic: Science and Astronomy News
Replies: 992
Views: 326769

Re: Science and Astronomy News

More bad news for the idea of there being biosignature-levels of phosphine in the atmosphere of Venus. More spectral lines were checked with very high precision, and a strong negative result was found.

Phosphine in the Venusian Atmosphere: A Strict Upper Limit from SOFIA GREAT Observations
by Watsisname
13 Oct 2022 02:44
Forum: Science and Astronomy Discussions
Topic: Asteroids, meteors, and meteorites
Replies: 158
Views: 54524

Re: Asteroids, meteors, and meteorites

And a nice fireball over the Pacific Northwest a couple hours ago. I completely missed it, though my brother was out driving and saw the whole sky light up blue-green. Apparently was visible from all across Washington, parts of Oregon, and BC. I'm guessing this one is unlikely to have dropped any st...
by Watsisname
24 Sep 2022 03:37
Forum: Off-topic Discussions
Topic: Totally off-topic thread
Replies: 1066
Views: 380071

Re: Totally off-topic thread

What's the reason for this sky colour? Wildfire smoke (from fires spread all over -- California, Oregon, Washington, Idaho, BC). We've had many bad smoke years recently, this one not the worst (I think that goes to 2020), but not very far from it.  Conditions much improved in the last few days thou...
by Watsisname
11 Sep 2022 15:03
Forum: Off-topic Discussions
Topic: Totally off-topic thread
Replies: 1066
Views: 380071

Re: Totally off-topic thread

The Sun at noon here yesterday, hiding between the trees.  :???:

Image

Slight improvement in the afternoon, made for some interesting lighting.

Image
by Watsisname
06 Sep 2022 11:23
Forum: Science and Astronomy Discussions
Topic: Astrophotography
Replies: 661
Views: 202753

Re: Astrophotography

Nice real-time video. It was a surprisingly good and long-lasting show. Looks like every time zone potentially had a view, and I've seen photos from people as far south as Lithuania, and Oregon along the Columbia River. Excited to see what will come next as we get further into this active solar cycle.
by Watsisname
04 Sep 2022 11:22
Forum: Science and Astronomy Discussions
Topic: Science and Astronomy Questions
Replies: 1937
Views: 626008

Re: Science and Astronomy Questions

A density as high as 7 g/cm^3 is plausible for a mostly silicate "rocky" planet, with a mass of around 10 Earths. For a given bulk composition the density will also be greater if the planet's mass is greater, due to compression. This effect becomes very significant for masses more than abo...