Heliocentric and baryocentric corrections.

  • Thread starter theneedtoknow
  • Start date
In summary, the conversation discusses the use of IRAF to determine the heliocentric corrections needed for spectral images of a star taken at different points in the Earth's orbit. The speaker is trying to estimate the difference between heliocentric and barycentric corrections and suggests using classical mechanics to find the common center of mass between the Earth and the sun. It is mentioned that IRAF may already apply barycentric corrections and the difference between the two types of corrections would be less than 5%. The speaker questions the need for a heliocentric correction when a barycentric one would suffice.
  • #1
theneedtoknow
176
0
I have a bunch of spectral images of a star taken at various points in the Earth's orbit. I have used IRAF to determine the heliocentric corrections necessary. I am trying to get a rough estimate as to the difference between these heliocentric corrections, and what a barycentric correction would be. I can't really think of a way to estimate it. The only thing I can think of would be using some classical mechanics to find the common centre of mass between the Earth and the sun, and then find the velocity of the sun around this centre of mass, and it will be the approximate difference between the 2 kinds of corrections. Is this along the right track?
 
Astronomy news on Phys.org
  • #2
If IRAF does "helicentric corrections", I can't imagine why they would not actually be barycentric anyway. Also, the difference is very small-- whatever correction you needed to apply to account for the Earth's motion about the barycenter, if for some reason you wanted to express that as a heliocentric correction, the difference in the two corrections would be less than 5%. You know how much of a correction you applied, would you care to refine it by 5% of the correction you did? Also, why would IRAF bother to include a heliocentric correction rather than a barycentric one?
 

What is the difference between heliocentric and baryocentric corrections?

Heliocentric corrections refer to the adjustments made to astronomical measurements or calculations to account for the fact that Earth orbits around the Sun. Baryocentric corrections, on the other hand, take into account the gravitational influences of other large bodies, such as planets, on the motion of the Earth.

Why are heliocentric and baryocentric corrections necessary?

Without these corrections, astronomical measurements and calculations would be inaccurate, as they do not take into account the movement of the Earth and the gravitational influences of other large bodies. These corrections help to provide a more accurate understanding of celestial motion and the forces at play.

How are heliocentric and baryocentric corrections calculated?

Heliocentric corrections are calculated using the orbital parameters of the Earth and the Sun, as well as the position of the observer on Earth. Baryocentric corrections involve more complex calculations, as they also take into account the orbital parameters and positions of other large bodies that may affect the Earth's motion.

Do heliocentric and baryocentric corrections affect all astronomical measurements?

Yes, these corrections are necessary for accurate measurements of all celestial objects, including stars, planets, and galaxies. Without these corrections, the movements and positions of these objects would appear different than they actually are.

How do heliocentric and baryocentric corrections impact our understanding of the universe?

These corrections play a crucial role in accurately determining the distances, motions, and interactions of celestial objects. They help to refine our understanding of the laws of gravity and the fundamental forces that govern the universe.

Similar threads

I How to get state vector in 4-observation method of Gauss
    • Astronomy and Astrophysics
Replies
2
Views
1K
I A New Idea for the Origin of Earth's Water
    • Astronomy and Astrophysics
Replies
1
Views
1K
I Early Catalog of Planet-Hosting Multiple Star (≥ 3) Systems
    • Astronomy and Astrophysics
Replies
3
Views
1K
I Position and Velocity in Heliocentric Ecliptic Coordinates
    • Astronomy and Astrophysics
Replies
3
Views
3K
I Variations in Sun-Earth distance with a 2000-year cycle?
    • Astronomy and Astrophysics
Replies
7
Views
4K
Heliocentric polar orbit crossing the Earth's orbit twice
    • Astronomy and Astrophysics
Replies
8
Views
2K
I Infrared energy flux from the Moon
    • Astronomy and Astrophysics
Replies
7
Views
1K
I Estimating Mass of Central Object Using S2's Orbit Motion and Kepler's 3rd Law
    • Astronomy and Astrophysics
Replies
3
Views
1K
I Is EK Draconis' binary status a factor in its ability to produce large CMEs?
    • Astronomy and Astrophysics
Replies
4
Views
924
B Mass and Surface Gravity of a Dyson Sphere
    • Astronomy and Astrophysics
Replies
9
Views
2K

Hot Threads

Recent Insights

Back
Top