New answers tagged artificial-satellite
3
There are many conflicting requirements:
gain of the antenna
size of antenna
directionality of antenna.
bandwidth
To make antenna efficient you want it to have a narrow beam to direct most of the energy to the satellite. This implies your antenna will be highly directional. For a hand held device it is almost impossible to aim the beam reliably when the ...
3
SpaceX has been launching Starlink satellites in large quantities and a recent launch may be the satellites you've seen. On release they have close spacing and slowly separate to the appropriate orbits.
According to the website, Heavens-Above, the most recent launch was Starlink 5 on 18 March 2020. The site describes the visible satellites as "string of ...
23
I found it.
It was NOSS 3-1, a satellite pair.
Found it through heavens above.
The pair also explains the apparent tumbling. However, it seemed much brighter than 4.1, but it‘s definitely it.
2
In-the-sky.org doesn't show anything that quite matches your specification. There was an H-2A rocket body (i.e. upper stage) overhead at 7:46 going from NE to ESE; there was an SL-16 (Zenit) rocket body a couple of minutes later going ESE to N. Tumbling rocket bodies can vary considerably in brightness.
3
Let me put this in a different frame. First recall that magnetic fields also store magnetic energy:
$$
E_{mag} = \int_V H. B\, dV
$$
Now, from Lagrangian mechanics, note that:
$$
L = U-V = E_{mag}+E_{grav}-\frac{mV^2}{2}-\frac{\omega^TI\omega}{2}
$$
And let's forget some dissipative effects and the angular terms for now.
Recalling Euler-Lagrange's ...
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