Understanding Astronomy: Motion of the Stars
It can be confusing to tell them apart, especially from a distance. As two stars orbit each other they will at times be moving towards us, and. Hey space. I saw something strange the other night. Saw two stars floating and moving together. They picked up speed and then just faded. One thing to keep in mind, however, is that the stars do move slowly over the course of the night. The entire sky rotates about the point in the.
The Geneva models are also commonly used; most importantly, they cover a broad selection of stellar masses and metallicities, so given a certain star, you might be able to find a model to match. Composition The stars in a kinematic association likely formed at the same time and from the same molecular cloud or cloud complex; therefore, you would expect their chemical compositions - and, in particular, their metallicities - to be the same. With the exception of chemically peculiar stars arising from various processesthe group of stars might show the same spectral lines, for the most part - with expected variation in strength depending on temperature and thus spectral type.
The metallicity in particular is the key property, and can be readily measured via spectroscopy spectroscopy, by the way, is the underlying theme for today. Use a spectrograph to determine the spectra of the set of stars, if you haven't already. Sort them into subclasses of their spectral type note that for, say, OB associations, most of the stars will be of very similar spectral type.
Look at the presence of spectral lines to determine elemental abundances, as well as metallicity. I'm less familiar with the criteria for deciding for sure whether two stars are part of the same kinematic group, and I can't point you to a whole lot of stellar spectra databases, but I know that the ESO has a solid library of spectra for a variety of spectral types, as does the Sloan Digital Sky Survey albeit for individual stars.
Looking at spectral databases should be a starting point for you; reading spectra can be a helpful skill.
Final notes One thing to keep in mind is that there's going to be variation here. Chemically peculiar stars, multiple-star systems, additional waves of star formation, and other problems will exist, and can contaminate your data set.
That said, you can presumably remove these edge cases or adjust for them in your analysis. Plus, with the application of three different methods, you should be able to find that each member satisfies several of the criteria, if not all of them.
If I can talk about the example you gave the Sun vs. Alpha Centaurinote that Sirius has an age of only a few hundred million years. The Sun, on the other hand, is roughly 4. Sirius and the Sun definitely did not form as part of the same stellar association, and Alpha Centauri also likely formed separately.
We can determine a few things about the open cluster the Sun was born inbut it's harder finding the cluster's former memberslargely because of the passage of time. Therefore, all of the techniques above work primarily on young groups of stars - with ages in the millions of years. If you're looking to find the radial velocities and proper motions of stars in our galaxy, you're in luck.
The second data release from Gaia came out this spring. As you would see an object on the bottom of a swimming pool move as the surface undulates with waves so the stars can wobble as their light is refracted through the air. It looks like it's moving everywhichaway! It's just the brain trying to make sense of an image, but, wow, it's impressive and humbling: After a meal I went outside for a smoke, I generally look up and gaze at the stars. I noticed a very faint object lit up just like a jet but didn't hear anything such as the turbine engines which suggests it was very very high.
- Do Stars Move?
- Motion of the Stars
As I watched it move south it suddenly lit up very bright and then shortly after the light went off. It continued to move south and then stopped south-east of another star. It has been sitting there without any movement for the past 30 minutes.
I have noticed 2 shooting stars to the east and west of this moving object. I love astronomy, and I can identify some constellations but I can't identify every star in the sky so all I can say is its about degress in the south-eastern portion of the sky.
It is sitting south-south-east below another more faint star.
Do Stars Move? - Universe Today
It seems to be have blinking red lights on the outer edges and 2 blue lights toward the center. If whatever this is really is a star then it should be possible to find on a star chart but if it was actually moving then it shouldn't show up on star charts. It even seems to be moving at the same pace with all the other stars and its pretty much straight up in the sky but still in the south-eastern portion of the sky.
I can't believe what I saw is just turning out to look like another star Although, as the clouds were passing by I saw a very visible bright flash below the original object I was looking at.
Also, the original object I was looking at is now in a different position according to the star it was nearby. Earlier it was to the south-east of the star above, but now it is to the south-west of the star above. This cannot be a star or else it would be moving at the same pace as all the other stars. Barney gumble Sep, I was on a cruise ship in the bahamas, on the top deck with about 10 other people. As we were laying there i noticed a slow miving star, i made an attempt to point it out when all the sudden it darted right then left then up, basically zig zagging through the sky and then seemed to warp back out into the dark.
At that same moment 4 other people stood up and in amazment.
Saw two stars moving together in the sky. : space
I understand this theory of rapid eye movement Do it and if nothing the first time try again a few times, youll see them, and im a rational individual talking im not crazy, but look and youll see.
These stars move slow and some in patterns. One strange pattern we seen was a circle, then they straightened out into a line. It may seem crazy, but we all seen them.
I have also seen stars do some pretty crazy things. Back around I used to see a lot of weird things happen with stars. It looked just like a star. It can make a star, or stars, appear to move in random jerky patterns. Barney gumble Nov, But i was with at least 4 other people that saw the exact same thing at the exact same time.
And we stayed out the rest of the night and did not see anything else. I guess my question is can 4 different people experience autokinesis at the same time?
This phenomenon can cause considerable confusion for pilots, especially those flying in formation or rejoining on a refueling tanker at night. So yes, if all four people were doing the same thing, staring at a stationary light for 6 to 12 seconds, all four could see the same effect. I went outside to check it out. I thought I'd turn around so I didn't fall flat on my back. Now where the heck did that go? Then suddenly, here comes the shuttle. It was very bright and really moving along. It almost looked like an airplane cruising along - with no noise.
I figured I hallucinated the "moving star. I myself saw something that looked exactly like a moving star only it was the middle of the day and sunny out so I don't if its the same thing it was also the only one in the sky. Anyone ever see a moving morning star? I and another person with me at the time were able to keep our eyes on it the entire time and trace it along with our fingers.
This was in Central Park New York so we finally lost it over the tree line but the area we were at had no trees it was a large clearing. A "rectangular trip through the sky"?
Wide Binary Stars: Long-Distance Stellar Relationships
You mean its path actually formed the shape of a rectangle? How big an area of the sky did this rectangle cover? Was it a sunny day and what time of day was it? Might it have been an airplane at high altitude, maybe in a holding pattern? It was sunny and very clear not one cloud at all 85 degrees that day and maybe around 1: I don't know if the day matters any. It was not an airplane it was much too high and much to fast.
And with more precise instruments, we can see some stars appearing to move back and forth relative to other ones. But stars also have their own proper motion through space. The Earth takes roughly 24 hours to spin on its axis, moving from east to west. And if you watch the sky over a few hours in most locations on Earth, you can see the same thing happening: There are some exceptions to this rule, however: They just keep spinning.
If your geographical location happens to be close to the pole, most stars will be rotating around the pole and very few will rise and set. And in a trick of geometry, it will be hard to see the Sun, moon and planets since their path in the sky is at It takes us about days to make a full trip.