Daniel Fischer

@cosmos4u

All things astronomy and space (and then some) - in tiny bits and pieces but mostly with links to more ... :-)

Königswinter, Germany
Vrijeme pridruživanja: listopad 2008.

Medijski sadržaj

  1. prije 4 sata

    BTW, here is another recent digital treatment of that legendary 1895 movie clip: - wonder how much (manual) effort is involved in this ... and whether we might soon / one day see a lot of poor quality early space age footage in a new way. h/t

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  2. prije 8 sati
    Odgovor korisnicima i sljedećem broju korisnika:

    Here is the key slide from the AAS presser with three numbers to ponder. (This refers to unmodified Starlinks in operational orbit and attitude, not the even much brighter freshly launched trains.)

  3. prije 8 sati
    Odgovor korisnicima i sljedećem broju korisnika:

    The 3rd Starlink chain two weeks after launch, rising from the horizon on 21 January (see for full context) - I was honestly shocked how bright they were already at very low elevation, in spize of the large distance and atmospheric extinction.

  4. prije 8 sati
    Odgovor korisnicima i sljedećem broju korisnika:

    The respective study is discussed in the second presentation of the January 8th AAS press conference (the speaker also sent me his much longer presentation from the earlier technical session; they've done a lot of modelling but much more needs to be done).

  5. 4. velj

    Space history must be hard. On German TV they just showed the 2015 episode on the Mir fire from the Discovery Channel's "Secret Space Escapes" - which systematically writes the German cosmonaut R. Ewald out of history who was also aboard.

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  6. 3. velj

    While continues a slow fade (here a cloud of amateur observations since beginning of the year), professional astronomers are observing its *resolved* disk and surroundings: - the data reduction is very complicated, though, so ... patience. ;-)

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  7. 3. velj
    Odgovor korisniku/ci

    This is from which *cannot* be from 1947 as e.g. escape seat testing for the F-104 is shown ... which was *designed* in 1952 only. Please find out from which year this really is.

  8. 3. velj
    Odgovor korisniku/ci

    Hmm, die Quelle behauptet ebenfalls von 1947 zu sein - kann aber nicht stimmen, weil z.B. die F-104 überhaupt erst 1952 *entworfen* wurde ...

  9. 2. velj
    Odgovor korisnicima i sljedećem broju korisnika:

    "Steady" is in the eye of the beholder ... see the bottom of for several plots. (And here's a VOL-only 100-day plot - he's been on Alf Ori *way* longer than PTOB, for many *years* actually - with a clear slow-down of the trend.)

  10. 1. velj

    More fun with light curves up to today for a review of the situation in (scroll all the way down): slightly fading again to between 1.55 and 1.60 mag. now after a ~1.5 mag. quasi-plateau in mid-January? So much excitement, so much noise ...

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  11. 31. sij

    Wanna see one more scary / fascinating / shocking video of the fresh chain #4 (from New Zealand)? Comes with sweet music:

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  12. 31. sij
    Odgovor korisniku/ci

    Can we invert that problem? Like predicting when we in Europe will have the next chance to see a satellite train that is only days old (as was the case after the May 2019 launch)? As much as I'm worried I'd like at least to see something like one day ...

  13. 31. sij

    Processed screenshots from the NASA webcast of the departure - cropped, gamma-corrected and de-distorted (which is sadly still necessary at times; even in 2020 NASA still can't tell 4:3 from 16:9 video formats reliably ...) when needed.

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  14. 31. sij

    Seconds before the 2nd stage shut down, the video feed terminated and the kick stage separated - everything else is 'dark' now ...

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  15. 31. sij

    Staging and fairing separation of the Electron.

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  16. 31. sij

    There goes the 11th Electron! And just before from another camera angle we saw tons of sheep grazing in front of the rocket. Welcome to New Zealand ...

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  17. 31. sij

    First visual - actually a cool real-time movie clip - of the fourth chain I've seen in which the satellites launched on the 29th are still pretty close to each other:

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  18. 30. sij

    Now that neither Betelgeuse has exploded nor the two satellites have collided how about this scenario? Seen last night in a talk about religion and spaceflight ...

  19. 30. sij

    Here is the old infrared observatory IRAS gliding happily - if defunct for decades already - over the California sky, three hours after the close encounter with that other satellite:

  20. 30. sij
    Odgovor korisniku/ci

    The past four weeks of photometry from the AAVSO database: essentially a plateau around 1.5 mag. or maybe a very slow fading - whether the latter got a bit steeper in the past week is still TBD and may not be significant. (And certainly no brightening in sight yet.)

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