Questions tagged [planetary-transits]

For questions about transits of planets in front of the Sun, as seen from another, more distant planet; for example, the transits of Mercury and Venus which are visible from the Earth.

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1answer
35 views

constructing a transit light curve [duplicate]

What type of equipment would I need to construct a transit light curve of a planet. It doesn't have to be an exoplanet. If somebody could chuck a list that would be really helpful.
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Lightkurve nan values after bin light curve

I am using lightkurve 2.0.2 library with Python 3.8.5 and astropy 4.2 for processing exoplanet transits. However when I want to bin light curve to fixed number of points, all values in ...
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1answer
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Exoplanet dip in transit light curve when the planet passes behind the star

In the animation below, I don't understand why the brightness slightly decreases when the planet is behind the star. Where does this effect come from?
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Did simultaneous transits of Mercury and Venus actually last occur in 373,173 BC?

According to the Wikipedia article for Transit of Venus, the last time a transit of Mercury and a transit of Venus occurred at the same time was 22 September of 373,173 BC. This is a Featured Article ...
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How to calculate the limb darkening $\mu$ value

I am reading about limb darkening and I am very confused how to find the value of $\mu$. It states it can be found by $\mu = \cos(\gamma)$, but I am lost how $\gamma$ is found, or what it represents. ...
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1answer
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How do scientists differentiate between a total and a partial transit of a planet passing in front of its star?

Say there's a star in our local neighborhood with a Jupiter-sized planet orbiting around it. This planet's orbit happens to lie approximately in our line-of-sight – we can only see a quarter of it ...
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1answer
91 views

Occultation of planets by other planets

Two Keplerian closed orbits always intersect: Source: Astronomy SE answer by Flater As seen from Earth, Venus appears larger than Mercury; this makes sense because Venus is both larger and closer ...
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2answers
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Can a planet in our system eclipse the sun as seen from another one?

When the Sun, Earth and Moon get properly aligned, we get eclipses, where the Sun is partially or totally hidden by the Moon when seen from Earth. Is it possible for one planet of the solar system to ...
3
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1answer
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What percentage of habitable-zone planets are detectable by transit?

I realize that the probability of detecting a planet by transit depends on the size of the star, the size of the planet's orbit, and the size of the planet; and ranges from ~10% to a small fraction of ...
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Using lightkurve to identify a planet

I have gotten LightKurve to work and plot a lightcurve to allow for the identification of possible transits. However is there a way I can get it to run and tell me if there is a possible transit in ...
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Records of Venus transits prior to 1761

Following the publication in 1716 of Edmond Halley's method to determine the solar parallax with the transit of Venus, many expeditions were launched to observe the 1761 transits. The following ...
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1answer
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Is it still the case that the transit of Mercury can't be measured with sufficient accuracy to determine the Sun's distance?

The book Transits -- When planets cross the Sun, Maunder & Moore, page 44 states that Legentil [was] one of the first to realise that transits of Mercury could never be observed with sufficient ...
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Calculate mass of exoplanet from transit method

Is there any way to calculate (or at least estimate) mass of an exoplanet from transit method? I know that mass can be calculated with radial velocity method, however I would like to create program ...
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1answer
62 views

How to recognize exoplanet transit

I am using Python package lightkurve for exoplanets searching by the transit method. When I download light curve of some star and apply periodogram, I find frequency and power of periodic components ...
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2answers
171 views

Transit of Uranus from Neptune

I would like to help find sources or calculations for the following dates found in Wikipedia (in French). The next Uranus transit from Neptune will happen : ...
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1answer
304 views

Calculate depth and duration of exoplanet's transit using Python, astropy or lightkurve

I am creating a program for the analysis of exoplanets in Python using Astropy and Lightkurve libraries. I have light curve of specified star and I would like to calculate depth and duration of planet ...
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2answers
314 views

Get orbital period of exoplanet from light curve using astropy.timeseries

I am using astropy and I would like to calculate orbital period of an exoplanet by its star's light curve. I follow tutorial in astropy docs and I use data from Kepler in Nasa Exoplanet Archive. ...
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1answer
102 views

When was the atmosphere of Venus first observed?

Nowadays, atmospheres of transiting exoplanets are being characterized. We can measure the absorption of the star's light through the exosphere of exoplanets. The same can be done closer to Earth, ...
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3answers
108 views

Can lunar occultation of Venus occur during solar eclipse?

Moon can occult Venus. Venus can transit across the solar disc. Moon can elipse Sun. Can all three celestial events occur at the same time - Moon is at front of Sun (partial eclipse is fine) and Venus ...
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1answer
81 views

Between Mercury and Venus, which planet produces a longer transit? Assuming both planets describe same path on the solar disk

Is it even possible to give a definite answer to this question? There are a lot of factors involved in this like Earth's position and motion relative to the planets and of course their own motion and ...
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1answer
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How can a Grade-11 Student avail TESS data and learn to process?

As mentioned, I am a Grade-11 student. I have always been interested in Data Processing activities. This sums up my experience of working on Asteroid hunt Campaign under IASC (International Asteroid ...
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1answer
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How could one use the transit of Mercury to try and find the Astronomical Unit?

I am trying to use the transit of Mercury to estimate the distance between the Earth and the Sun, or 1 AU. I know that I need to observe mercury from two antipodes, but I do not understand any of ...
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2answers
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Accuracy of Mercury transit calculations

What is the error range for calculations for the time of 1st-4th contacts for a given GPS coordinate on Earth? I observed through a telescope the 3rd and 4th contacts and compared against SkySafari ...
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Is it possible to see mercury transit “clearly” by the naked eye?

I don't have a telescope but I'm interested in seeing events like eclipses and transits. I'll use the atmosphere as my big natural lens. So I'll watch the upcoming mercury transit at the sunset time ...
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1answer
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Why would a tidally-locked rocky planet have a first-order spherical harmonic surface temperature distribution?

The new Letter to Nature Absence of a thick atmosphere on the terrestrial exoplanet LHS 3844b (also ArXiv) analyzes the thermal infrared light curve from the system (about 4.5 to 5.5 um). The planet ...
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Why do transits of Earth across the Sun seen from Mars follow a pattern of occurring after 26, 79 then 100 years?

According to this answer transits of Earth across the disk of the Sun as seen from Mars: The (Arthur C.) Clarke story is quite correct. Earth (and Moon) would transit the sun from the viewpoint of ...
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1answer
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Are these real paths of planets as traced from Earth?

Few days a go, I came across these two pictures of paths of planets as observed from Earth. They have a perfect geometric shapes. Actually, to me they look so beautiful and perfect, that they appear ...
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Transit Method Curve

My assignment is to identify how many planets are in this curve and what the orbital period is. I'm just confused on the way it looks, as most curves I've seen up to this date are more smooth and ...
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2answers
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A few questions regarding the transit of planets

Here we will be concerning ourselves with the transit of a planet with it's parent sun. I have a few questions that I am not sure about: 1) Do all planets transit their parent sun? It would seem to ...
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1answer
389 views

How do astronomers know if a planet is orbiting a star, or it's simply another star in the background?

For example, if astronomers photograph a "planet", which is in close proximity to a given star, then this "planet", could actually just be another "star" in the background, many light years away. It ...
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1answer
223 views

When are the planets occulted by the sun?

There are numerous lists available of past and future planetary transits and occultations, but I can't find any that list transits behind the sun. Do the planets in our solar system ever pass ...
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How does an eclipse differ from an occultation?

A comment in response to this question suggests that an eclipse differs from an occultation in that the former casts a shadow while the latter doesn't. This isn't particularly satisfactory since ...
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Can the period of the planet transit across the sun be calculated in the same way the eclipse year is?

I read from Wikipedia$-$Eclipse cycle that the eclipse year, which is the period of Earth's hitting a certain node of its orbit around the sun, that is, the ecliptic, and the moon's orbit around Earth,...
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1answer
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How to compute the sun's (upper) transit

As detailed in https://physics.stackexchange.com/questions/41450/is-there-a-simple-accurate-formula-for-calculating-transit-times-from-rise-and, the sunrise, and set times can accurately be used to ...
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1answer
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How to calculate the angle formed between 2 planets?

I am interested in calculating the angles formed between planets like Saturn opposite to Neptune - 180 degrees, PlanetX opposite/trine/square to PlanetY. How to find such degrees? I use Stellarium ...
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1answer
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When will the next transit of Earth be visible from Mars? Was the last one really on May 11, 1984?

@PM2Ring's comment mentions the story Transit of Earth written by the famous British science fiction writer, science writer and futurist,3 inventor, undersea explorer, television series host, Fellow ...
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How does a Solar Transit give more accurate determination of Earth-to-Sun distance?

I understand how Solar Parallax calculation determines the Earth-Sun distance using measurements of (a) the baseline distance between two widely-separated terrestrial telescopes and the (b) two angles ...
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2answers
662 views

Guess inclination angle from radial velocity measurements

I came upon this question where the situation is I have radial velocity measurements of a star with two circular orbiting exoplanets and the question is how to find out if the inclination angles of ...
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2answers
337 views

How long does it take the center of the Earth to complete a full orbit?

If we take midnight of 1/1/2017 in any country and mark in space where the center of the Earth is located, at what date, in the same country, has the center completed a full orbit. I am almost ...
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1answer
650 views

How (the heck) was this photo of Venus at inferior conjunction (between us and the Sun) taken?

This great answer by @gerrit discussing planetary phases seen in visible light contains the image I've included below. According to the Wikimedia Commons link these are ESO images from the Venus ...
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2answers
120 views

Detection of exo-planets

One method used for detecting exo-planets is to look for a slight dip in the parent star's luminosity as the planet transits the stellar disc. Intuitively, it seems to me that if planetary systems in ...
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1answer
123 views

What's the influence of a tilted orbital plane, when observing an exoplanet transit?

I made an illustration to explain what i mean : If we assume we have two similar planet/star systems (similars in size/mass/period..) but tilted differently relative to us. How can we predict that ...
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1answer
127 views

How do we know the order of the new Trappist-1 planets?

Using transit photometry astronomers were able to discover Trappist b through h. Based on this question we learn that the naming of planets is based on their distance from their star (b being the ...
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1answer
443 views

Exoplanet rotation period

Is there any way through which we could determine the ROTATION period of an exoplanet based on the data we observed?(from transit)
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1answer
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Is it possible to tell if a certain extrasolar planet produces its own magnetic field?

I know by observing the dimness of a star it is possible to calculate an exoplanet's distance from the star and its mass by how much the star wobbles. However, is there any way to accurately determine ...
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1answer
161 views

Can a telescope be built to focus on a point source star?

If a Kepler telescope were built to focus on one point source star at a time, would it provide more information, or did Kepler capture virtually every photon from any given star anyway? In order to ...
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1answer
127 views

What telescopes have observed anomalies in the light curve of Tabby's star, KIC 8462852?

KIC 8462852, the F-star that inexplicably dims by up to 20% for short periods, is still getting alot of attention. A slow continuous dimming by about 0.3% a year has been identified recently. But all ...
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1answer
418 views

(How) Can one determine if an exoplanet is synchronously tidally locked or not? [duplicate]

Mercury is asynchronously tidally locked so that all of its surface regularly sees the Sun. But an exoplanet which is synchronously locked to its star, could we tell that it is? It would have a hot ...
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1answer
81 views

Does Earth transit look like a black dot surrounded by red light?

As we know, lunar eclipse appear red, if we can see Earth transit from Mars, does it look like a black dot surrounded by red light on the sun?
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2answers
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Capability of observing transits with terrestrial telescopes of various sizes?

I have access to my university's telescope, Dearborn Observatory, an 18.5 inch refractor on the shore of Lake Michigan, just north of Chicago (yes, it's an atrocious location, but the telescope still ...