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4 votes
Accepted

Variable Types of Stars

It seems to me that you're mostly asking about star naming conventions, which is unfortunately a difficult thing to master because there are many many conventions. What makes this process difficult is ...
zephyr's user avatar
  • 15k
3 votes

Calculating Radial Velocity from Hipparcos

You cannot calculate the radial velocity from a proper motion. The proper motion is the motion you see the star move on the sky, so perpendicular to your line of sight towards the star. The radial ...
user2998's user avatar
2 votes
Accepted

Stellar Information from Hipparcos

Hipparcos measured the parallax (distance) of stars, along with their colors in two wavelength regions (B_Tycho, "blue" and V_Tycho, "green"). Using the color information you can make a reasonable ...
Thomas's user avatar
  • 196
2 votes

Calculating Radial Velocity from Hipparcos

For your purpose, I would suggest you follow the advice of the other answers - proper motion measures the component of velocity perpendicular to a line joining the Earth and the star and won't ...
ProfRob's user avatar
  • 152k
2 votes

python skyfield hipparcos sun mean longitude (L)

Thank you so much. Your comments made me look further, I found my answer in the code below. # # It was the mean_longitude (L) of of the sun I was after. ...
sybe's user avatar
  • 63
1 vote

Hip2.dat and Solo, Binary and Multiple Star Systems

All the stars I looked up are all either binary or multiple stars, I couldn't find a solo star, apart from the Sun (debatable). HIP2.dat (the Hipparcos parallax and proper motion catalogue) is not a ...
ProfRob's user avatar
  • 152k
1 vote

Calculating Radial Velocity from Hipparcos

As user2998 correctly states, one cannot measure the RV from proper motion, simply because they are perpendicular to each other. What needs to be done to get the RV is to measure the Doppler shift of ...
AtmosphericPrisonEscape's user avatar

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