Questions tagged [hipparcos]

Questions about the astrometric satellite of the European Space Agency, launched in 1989 and operated until 1993.

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python skyfield hipparcos sun mean longitude (L)

I calculate the ra and decl or the stars as below. Can I add the sun's mean longitude L (=M+w) to: ...
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Spurious periods of stars

What exactly is meant by spurious periods of stars? E. Tanner writes in Spurious Periods in Spectroscopic Binaries in 1948 Furthermore: Can spurious periods be produced by aliasing, and how can they ...
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What is the overlap between the Gaia and the Hipparcos catalog?

Is there any kind of concordance available between the sources in the Hipparcos catalog and the Gaia DR2 catalog? I.e., mapping the Gaia DR2 source_id to the Hipparcos HIP number?
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Why is it hard to reconcile Gaia DR2 with the HIP data set

I'm trying to get a database of about 20 million of the brightest stars in the sky for a project I'm working on, and I want to reconcile it with the Hipparcos data set. Currently, I'm only using the ...
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Hip2.dat and Solo, Binary and Multiple Star Systems

I've come across and am trying to decipher the hip2.dat file to work out whether a star is a solo, binary or multiple star. Ideally would be ...
1 vote
3 answers

Calculating Radial Velocity from Hipparcos

Using data from Hipparcos is it possible to calculate Radial Velocity. If we take 19 Leonis as example, RV is -3.70. Is it calculated from Proper Motion? Can I ask that any formulas be done in long ...
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Stellar Information from Hipparcos

Is it possible to derive Metallicity/Age/Radial Velocity/Rotational Velocity/Surface Gravity of a star from Hipparcos data files or are do they require individual studying?
2 votes
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Variable Types of Stars

I'm trying to decode the Variable Types of stars in the Hipparcos Library. I see there are a number of stars for example :- EA/AR - Does that mean the star is both a EA(Eclipsing Binary Star) and AR ...
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Have I misunderstood Hipparcos Data with Arcturus?

If I take Arcturus for example, its HipID is 32349 and when i look at the raw Hip_Main.dat, it stays that the star's Spectral is K2IIIp whilst Wikipedia says the star's is KOIII. Why the discrepancy, ...