Questions tagged [hipparcos]
Questions about the astrometric satellite of the European Space Agency, launched in 1989 and operated until 1993.
10
questions
2
votes
0
answers
30
views
How to reduce Hipparcos catalog star coordinates to another Epoch?
Hipparcos catalog lists star equatorial coordinates (RA,Decl).
The coordinates are 1991.25 positions on ICRS reference frame (epoch J2000).
According to Astronomical Algorithms (J. Meeus) the ...
- 21
1
vote
1
answer
86
views
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:
...
- 63
2
votes
0
answers
53
views
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 ...
- 313
5
votes
1
answer
187
views
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?
- 153
3
votes
0
answers
66
views
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 ...
- 201
0
votes
1
answer
195
views
Hip2.dat and Solo, Binary and Multiple Star Systems
I've come across http://cdsarc.u-strasbg.fr/viz-bin/Cat?I/311#sRM2.1 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 ...
- 1,271
1
vote
3
answers
661
views
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 ...
- 1,271
1
vote
1
answer
65
views
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?
- 1,271
2
votes
1
answer
153
views
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 ...
- 1,271
2
votes
0
answers
86
views
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, ...
- 1,271