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#transit

9 posts9 participants0 posts today
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Fedi.Video

Oh The Urbanity! makes videos about cycling, public transport and urban planning. It's based in Canada, but it often looks at examples in other countries too. You can follow at:

➡️ @ohtheurbanity

There are already over 150 videos uploaded. If these haven't federated to your server yet, you can browse them all at video.canadiancivil.com/a/ohth

Canadian CivilOh The Urbanity!Oh The Urbanity! traverses cities by foot, bike, and public transit and aims to make informative and (hopefully) entertaining videos combining streetscapes and demographic data. We are based in Mon...
#FeaturedPeerTube#Urbanism#Cycling
Continued thread
Public
Scott

I don't think we talk about the cognitive burden of #transit enough. There is a lot of planning that goes in to a transit ride.
- Do I have fare/how do I pay fare?
- What's the schedule departing? Will there be options for my return?
- How far in advance do I need to leave to get there on time?
- What's my backup plan if my train is delayed or my bus never shows up?
- How much time can I spend at my destination and still make it home in a reasonable amount of time?

Replied in thread
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Peter Saathoff-Harshfield

I took the E line from the new Grand Ave Arts/Bunker Hill station, which is the deepest LA metro station, to Atlantic station. Even though the fare gates are at street level, they have to have a mezzanine level. I was a bit confused how to get down to the platform because the station was so big, for these kinda small trains. (Photo is of one heading in the other direction, in case you’re wondering why it says Santa Monica) #trains #transit

A yellowish/orangish light rail train pulling into an underground station. Its sign says Santa Monica.
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Radim

I had a surprising encounter this week. English speaking guy has spoken to me in the tram in my hometown of #Pilsen, Czechia, recognising the @notjustbikes pin on my backpack. He also asked if I know @nerd4cities, which is funny because he looked a bit like Ray himself. The fact you can both randomly encounter foreigner from the same rabbit hole and come across a friend from your middle school has to be one of the best things about living in a 200k city.

#urbanism#czechia#transit
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Aaron Brick — אהרן בריק

I am thoroughly unimpressed with the SFMTA's very expensive “Biking and Rolling Plan.” Apparently, in twenty years, there will still be motor vehicles on every single city street! By then my own street will be “calmed, shared” so basically, still full of cars, driveways, double parking, intersections, trucks, and essentially, no change at all. Fuck this plan.

#sanfrancisco#transit#urbanism
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Mikko Tuomi

First first-author paper by my PhD researcher Andras Haris. Not formally accepted yet, but major hurdles cleared.

He has analysed 3273 space telescope #transit light curves of 99 #planets, and identified 105 candidates for #starspot occultation events by six planets.

Homogeneous search for spot transits in #Kepler and #TESS photometry of K − M-type main-sequence #stars

#astronomy #astrophysics
arxiv.org/abs/2502.18129

arXiv logo
arXiv.orgHomogeneous search for spot transits in Kepler and TESS photometry of K $-$ M-type main-sequence starsLate-type stars are known to host numerous exoplanets, and their photometric variability, primarily caused by rotational modulation, provides a unique opportunity to study starspots. As exoplanets transit in front of their host stars, they may occult darker, spotted regions on the stellar surfaces. The monitoring of starspots from planetary transits, known as transit mapping, offers a possibility to detect small dark regions on magnetically active, late-type stars. These spots may be so small that they would be undetectable to other methods used to reconstruct stellar magnetic activity. We describe a Bayesian analysis framework on the transit light curves of planets orbiting K- and M-type main-sequence stars in search for spot occultation event candidates. We present a systematic analysis of high-precision, high-cadence light curves from Kepler and TESS to detect and characterise starspots during exoplanetary transits. According to our tests, the set of criteria applied in the analysis is robust and not prone to false positives. Our sample comprises K- and M-dwarfs hosting transiting exoplanets observed by the Kepler or TESS space telescopes at a high cadence, totalling 99 planets meeting our selection criteria. After analysing 3273 transit light curves from 99 planets, we find 105 candidates for starspot occultation events by six planets. We report new spot occultation candidates for the K-dwarfs HD 189733 and TOI-1268. The identified dark regions have a lower limit for radii between 1.6 degrees and 29.5 degrees and contrasts up to 0.69. We estimate a spot detection frequency of 3.7% and 4.2% for K- and M-dwarfs by TESS, and 37.5% for K-dwarfs by Kepler.
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