# Tag Info

7

One point doesn't tell you much of anything, other than that there is probably something in that direction. Pluto was discovered the same way many asteroids are, by comparing pictures of the same star field at different times, seeing if anything changes. Below is the discovery image from Wikipedia. The dot moved across the image, while all the stars ...

0

Many telescopes have computerised mounts, which once calibrated, will provide a direct readout of the RA and DEC of where the telescope is pointed Another method is to take a photo (typically via a CCD) of the unknown star, and identify stars around the new object. Then look up the RA and DEC of the known stars, and then interpolate to find the RA and DEC ...

-1

about the third law: I've read that Kepler was actually a mathematician. believing in heliocentric universe, Brahe's observations of planets some times deviated significantly from the place expected by the Copernican theory of circular orbits. strongly believing Brahe haven't made such great mistakes, Kepler thought, what if the orbits weren't circular???? ...

0

Matlab is faster than IDL and phyton. If you dont use linear algebra libraries It is also faster than fortran and C. You can try and see for yourself. There are some online matlab libs for astronomicsl image processing incliding treating FITS.

1

$\mu_{B}$ is surface brightness of an extended source in the B-band. This is given as (apparent) magnitude per square arc seconds. You need to calculate the area you observe at the distance R through an angle of 1 X 1 arc seconds. With some trigonometry applied you will get; $$A = 4 R^{2} \frac{1 - \cos \varphi}{1 + \cos \varphi}$$ Where the angle is 1''. ...

1

Disclaimer: I updated my previous answer as I found a more accurate formula. The rotation angle $\theta$ is the angle between the vernal point and the meridian at Greenwich. This also corresponds with the Sidereal Time at Greenwich, converted to radians. For a given UTC time and a given date, the corresponding Greenwich (Mean) Sidereal Time (in hours and ...

Top 50 recent answers are included