Ronald Drimmel

@rdrimmel

Astronomer, italian gringo from , Payload Expert, Mapper of the , fan of , , &

Osserv. Astrofisico di Torino
Vrijeme pridruživanja: srpanj 2014.

Tweetovi

Blokirali ste korisnika/cu @rdrimmel

Jeste li sigurni da želite vidjeti te tweetove? Time nećete deblokirati korisnika/cu @rdrimmel

  1. Prikvačeni tweet
    24. pro 2019.

    T'was the night before Christmas, when all through the house.. Oh, never mind. everyone! Evidence of a dynamically evolving Galactic warp — by Eloisa Poggio & Co. 😁 👀

    Poništi
  2. prije 5 sati
    Poništi
  3. prije 12 sati

    I live about 10km from Turin, a city of over a million people and can see them. I keep seeing this "5th magnitude" estimate in print, but they are at least 4th magnitude, and you don't need "much darker skies" to see them.

    Prikaži ovu nit
    Poništi
  4. prije 12 sati

    This is a good article, but 1) it's not new, but a reprint of an article issued on 20 Jan 2) it incorrectly reports that at operational altitude sats will, "dim to about fifth magnitude, visible to the naked eye only in much darker skies away from cities." ..(1/2)

    Prikaži ovu nit
    Poništi
  5. prije 14 sati
    Prikaži ovu nit
    Poništi
  6. prije 14 sati

    While not immediately obvious from the text, there's a lot of behind this impressive piece of work. Also, as pointed out by , 40 "dark" companions! !

    Prikaži ovu nit
    Poništi
  7. 4. velj

    Local cosmology with , raising the question: does the have a peculiar history?

    Poništi
  8. 4. velj
    Poništi
  9. proslijedio/la je Tweet

    More than 1,500 astronomers have now signed a petition calling for mega constellations like SpaceX's Starlink to be stopped, potentially via legal action, before their impact on astronomy can be assessed. Story from me

    Prikaži ovu nit
    Poništi
  10. 3. velj

    The , and a natural hottub (You need to click on the image to fully appreciate.)

    Poništi
  11. 3. velj

    finding an "invisible" binary system. Are next? The paper on this extraordinary microlensing event is here: (The figures are confused in the online version, but you can download the pdf.)

    Poništi
  12. 1. velj
    Poništi
  13. 1. velj

    Progress? 🤨We'll see. An interesting detail: Two soon-to-be-published papers presented on 's visibility problem and potential impact to observations. But, lest it be forgotten, this is NOT just about astronomy.

    Poništi
  14. 31. sij

    More on estimating the mass. (Mind your bias.)

    Poništi
  15. proslijedio/la je Tweet
    31. sij
    Poništi
  16. 30. sij
    Poništi
  17. 30. sij

    "Even in their final orbits at much higher altitudes, Starlinks remain at magnitude +5.." I've seen sats at their operating altitude of 550km, and they were definitely brighter than 4th magnitude.. This is not just about .

    Poništi
  18. 30. sij
    Poništi
  19. proslijedio/la je Tweet
    29. sij

    keeps on delivering! Our new paper is now on the ArXiv: In the work led by we have detected the Sagittarius stream all around the sky from proper motions alone. The result: a ~300.000 stars sample (dwarf+tails) [1/3]

    Prikaži ovu nit
    Poništi
  20. 29. sij
    Poništi
  21. proslijedio/la je Tweet
    29. sij

    With today's launch, now has (by my count) around 250 satellites in orbit. By the end of the year, it could be pushing 1,000. But are the world's systems for controlling space traffic up for the volume of new satellites? Critics say no.

    Prikaži ovu nit
    Poništi

Čini se da učitavanje traje već neko vrijeme.

Twitter je možda preopterećen ili ima kratkotrajnih poteškoća u radu. Pokušajte ponovno ili potražite dodatne informacije u odjeljku Status Twittera.

    Možda bi vam se svidjelo i ovo:

    ·