# 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.

81 questions
Filter by
Sorted by
Tagged with
1 vote
1k views

### What does an inclination of 0 degrees mean?

I understand that inclination is the measure of how tilted an orbit is. But is an inclination of 0 degrees like this or like this? I know there are many formulas relating inclination, including ...
• 733
79 views

### How can I calculate current position of planet in sky

How can I calculate current position of planet in sky from earth's point of view. I want to calculate based on given DATETIME and Location For example, if I see current position of planets on "23 ...
95 views

### Does the reflected light from Earth boost Venus' apparent magnitude when it is seen transiting the Sun?

During solar transits of Venus as seen from Earth, exactly 0% of Venus' disk is illuminated by sunlight, as expected. However during these transits, Earth is at opposition and fully illuminated by the ...
• 968
100 views

### What are the orbital periods Jupiter, Saturn and earth?

What are the highest accuracy (and hence precision) orbital periods of Jupiter, Saturn and earth in units of days. Note have Allen’s Astronomical Quant(Cox1991)/ Wolfram-α / Wikipedia / 3ea. don’t ...
1 vote
94 views

### Looking for a Specific Planet

I know my title isn't the most specific, but the planet I am looking for is. I have been looking through many exoplanets and I can't seem to find what I am looking for, the closest I have found is ...
• 121
70 views

• 415
167 views

### 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 ...
181 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 ...
• 2,233
7k views

### 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 ...
• 465
230 views

### 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 ...
• 143
1 vote
90 views

### 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 ...
• 11
48 views

### 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 ...
• 17.6k
1 vote
90 views

### 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 ...
• 17.6k
1 vote
2k views

### 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 ...
• 323
306 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 ...
• 323
1 vote
548 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 : ...
1 vote
1k 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 ...
• 323
1k 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. ...
• 323
206 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, ...
• 17.6k
337 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 ...
• 1,074
121 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 ...
114 views

### 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 ...
• 783
240 views

### 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 ...
• 63
210 views

### 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 ...
937 views

### 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 ...
• 213
128 views

### 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 ...
• 30.7k
201 views

### 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 ...
• 30.7k
7k views

### 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 ...
• 221
112 views

### Challenge with a 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 ...
336 views

### 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 ...
• 1,069
520 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 ...
• 1,069
429 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 ...
• 955
3k views

### 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 ...