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Questions tagged [solar-system]

Questions regarding the Sun and objects orbiting it.

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Do jets from gamma ray bursters and quasars cause gas clouds to collapse just as supernovae are postulated to do?

A supernova may have caused a gas cloud to collapse and form our solar system .But can jets from quasars and gamma ray bursters also cause gas clouds to collapse ?
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2 answers
212 views

What happens to planets as they cross the Galactic equator?

We know from research that the Solar System travels around the Galactic plane, and sometimes (periodically) dips below the Galactic equator, only to return and dip back above the Galactic equator ...
Jim's user avatar
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2 votes
1 answer
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Carbon dioxide on terrestrial planets

I guess it's a basic question, but why do Venus and Mars have so much carbon dioxide in their atmospheres? The vast majority of the universe is hydrogen (and a small percentage is helium). Why did the ...
Goose's user avatar
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3 votes
0 answers
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Grand Tack Hypothesis and Nice model

The two models describe the evolution of the solar system at different timescales, but both result in the current location of Jupiter. Are they compatible with eachother? Could the Grand Tack be the ...
jack_O'Dim's user avatar
7 votes
4 answers
3k views

How close will Pluto come to Earth this year (2024)?

For reasons associated with a 1943 story, I am keen to find how close Earth will come to Pluto in 2024. According to https://theskylive.com/pluto-tracker today (21-May-2024), Pluto is now slowly ...
Laska's user avatar
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3 votes
1 answer
99 views

Easy guideline for using JPL Horizons DE431 for planets in aphelion and perihelion from 11000 BC to 16000 AD?

Can someone give me a step by step Guide how to use JPL DE431 or DE441 as a Beginner. I tried the Horizons website app and Webgeocalc but it didn't showed understandable Information. This websites ...
Patrick Wackenhut's user avatar
1 vote
0 answers
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What is the difference between a solar eclipse's (a) magnitude and the (b) moon/sun size ratio?

After watching a Smarter Every Day 2 YouTube video featuring Gordon Telepun, I purchased his ebook Eclipse Day 2024 and More off the Google Play store. In the book, he has a link to Xavier Jubier’s ...
Curious Layman's user avatar
1 vote
0 answers
46 views

Gear trains of astronomical clocks available?

I have been modelling gear trains of astronomical clocks (e.g., Antikythera, Eise Eisinga Planetarium, Prague Orloj, Ancient Maya Solar System). I am now looking for gear trains of other famous ...
aviola's user avatar
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1 vote
1 answer
84 views

What causes the short term variation in the length of a march-equinox year

By a "march-equinox year" I mean the time between successive march/vernal equinoxes. I understand that this is different from the mean tropical year, and I also understand why this would be ...
anonymous's user avatar
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4 votes
0 answers
66 views

What are the technologies needed to make deep space LIDAR competitive with RADAR? Any plans for tests, prototypes or "pathfinder" systems?

ProfRob's answer to Would it be practical to map out the Kuiper Belt and Oort Cloud via Radar? gives us a "sobriety check" on the idea. Citing an example of a 1 million watt transmitter at ...
uhoh's user avatar
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Range for Radius and Mass of Solar bodies

I'm trying to build a table with the Min and Max Radius and Mass of Solar bodies. In order to get data to be able to random generate other solar systems. This is a basic exercise, I'm pulling data ...
Tiago Matos's user avatar
1 vote
0 answers
72 views

How can I calculate the geocentric longitude of Pluto in a similar way to VSOP87's algorithm?

The book "Astronomical Algorithms" teaches a way to calculate the position of any of the planets for almost any date, until you get to Pluto. To try to get around that, I attempted to ...
Matheus Azevedo's user avatar
5 votes
1 answer
186 views

Would it be practical to map out the Kuiper Belt and Oort Cloud via Radar?

I recall reading an article where the moon, could be detected via radar and that orbiting radar satellites could map out the surface of mars, and in some cases even parts of Venus (the lattermost ...
Sidharth Ghoshal's user avatar
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0 answers
64 views

How to find the Moon's node longitude crossing

Yes, I asked this in the past but I got sidetracked and did other things. Now my question is, can one find the exact time when "north node" reaches a certain longitude? I am looking for 15....
dimitri33's user avatar
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2 answers
94 views

the difference between the heliocentric and the geocentric

Is the difference between heliocentric and geocentric velocities a matter of the coordinate system? Or are these kinds of velocities different? For example, the speed of a comet at perihelion is 71km/...
Robert's user avatar
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Meteor Triangulation

I´m looking for literature and examples on the subject of meteor triangulation. For example, graphical representation and calculation of a meteor orbit observed from two different geographical ...
Robert's user avatar
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0 answers
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For the SST/CHROMIS H-β spectral line at 4846 Angstrom (Å), what is the difference in solar altitude observed at wavelengths differing by ±0.1 Å?

For the SST/CHROMIS H-β spectral line at 4846 Angstrom (Å), what is the difference in solar altitude observed at wavelengths differing by ±0.1 Å?
Isomorphism's user avatar
13 votes
2 answers
2k views

Multiply Earth's orbital speed with square root of 2

Earth's escape velocity is 11.18 km/s. If I multiply Earth's orbital speed with the square root of 2, 29.7827 km/s x 1.41 = 42.11 km/s How is this speed called? I found this equation in an old German ...
Robert's user avatar
  • 177
9 votes
3 answers
3k views

Unreasonable ratios in astronomy as ways of remembering

In mathematics there are approximations to pi such as: $\pi\approx\dfrac{355}{113}$ that have extraordinary accuracy and are useful ways of remembering or being able to calculate a value close to pi ...
David's user avatar
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25 votes
4 answers
6k views

Is it coincidence that the earth's rotation and revolution are in the same direction?

In a reference system where the sun is static, the rotation and revolution of the earth are, when viewed from above the north pole, both counterclockwise. Is it a coincidence that they agree? Or does ...
Marc Vaisband's user avatar
4 votes
1 answer
256 views

Voyager spacecraft distance from Earth

According with NASA JPL the earth catches up with the spacecraft because Earth is moving a lot faster than the spacecraft. Can one calculate the times when the spacecraft gets closest to Earth
dimitri33's user avatar
  • 167
8 votes
3 answers
3k views

Would be possible to detect Planet Nine as a microlensing event along the line of its projected orbit?

Theoretically proposed by Konstantin Batygin and Mike Brown (@Caltech), Planet Nine could have a mass of $\sim 6.3 \pm 2 M_{\oplus}$. Even though I don't know if the hypothesis is still feasible at ...
nuwe's user avatar
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2 votes
1 answer
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Why do these two sources list different values for the Solar axial tilt to the ecliptic and Earth's orbital inclination to the Solar equator?

On the Wikipedia article for axial tilt the Solar axial tilt is listed as 7.25° to the ecliptic, whereas on the Wikipedia article of orbital inclination Earth is listed as having an orbital ...
Outis Nemo's user avatar
2 votes
1 answer
163 views

On what four dates dates do we observe the minimal, maximal, and two days of zero Solar axial tilt relative to us?

In case the title is a bit confusing, what I'd like to know is essentially respectively on which dates the Solar axial tilt is pointing straight towards Earth, straight away from Earth, and ...
Outis Nemo's user avatar
1 vote
0 answers
127 views

The rocky planet sizes between the Sun and Jupiter are small, big, bigger, small, and unfinished. Is there a reason?

The rocky planet sizes between the Sun and Jupiter are small (Mercury), big (Venus), bigger (Earth), small (Mars), and unfinished (the asteroid belt). Is this just random chance or is there a theory ...
phil1008's user avatar
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1 vote
0 answers
58 views

Tracking the position of the sun at various times of the day and night for a particular location

I am looking for a website that will provide me with the degree above and below the horizon of the position of the sun at various times of the day and night for a particular location. looking for ...
sunwatcher's user avatar
2 votes
1 answer
114 views

Implementing polar coordinates correctly in solar system model?

I am working on a 2d solar system model using Python, but I'm unsure if my implementation of planet data is correct. I have the planet data stored in polar form (distance, velocity and angle), and I ...
Tmpecho's user avatar
  • 45
2 votes
1 answer
81 views

How to flatten 3d astronomical coordinates into 2d polar form in Python

I first asked this at Stack Overflow but got redirected here I am making a 2d simulation of the solar system. For that you need a starting point for all planets. Right now I am storing that data in ...
Tmpecho's user avatar
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5 votes
3 answers
207 views

Why are there gaps in the size distribution of solar system moons?

Looking at the moons natural satellites in the solar system, the larger ones appear to fall in a few groups of sizes. Eyeballing the above picture, there appear to be a bunch of big moons (the ...
JanKanis's user avatar
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2 votes
1 answer
90 views

Chiron ephimeris calculations

I am able to find the current location for 95P/Chiron using swisseph with a simple code but i am interested into trying to calculate longitude crossings including retro etc .. but at first i only ...
dimitri33's user avatar
  • 167
3 votes
1 answer
160 views

How much mass did the Late Heavy Bombardment add to Mars?

How much mass was deposited on a terrestrial planet during the Late Heavy Bombardment (LHB)? Is it possible to estimate a reasonable interval, specifically, for Mars? Could the mass addition to Mars ...
Michael_1812's user avatar
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8 votes
1 answer
3k views

Why did the dust between the planets disappear during the birth of the solar system?

I'm catching up on my childhood mistakes. One of them was the "nuclear flash", the enormous explosion when the sun ignited. Apparently, this did not happen as the ignition of the sun was a ...
Dominique's user avatar
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0 answers
46 views

How to plot right ascension with time of the retrograde motion of mars? [closed]

Measure the right ascension, declination of mars and sun. plot the variation of right ascension with time.
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2 votes
1 answer
378 views

How did the temperature of the solar system evolve?

As a child, I've read that stars ignite during a so-called "nuclear flash". I understood this as a very violent outburst of energy from the sun, causing all dust between the protoplanets to ...
Dominique's user avatar
  • 445
1 vote
0 answers
79 views

Calculating the absolute magnitude of a solar system body

I am trying to calculate the absolute magnitude of a solar system object, given its albedo, and assuming all of its luminosity comes from reflecting light from the sun. Using $L_{sun}$ = solar ...
CuriousCosmos's user avatar
0 votes
0 answers
28 views

Solar system datasets for exoplanet analogs?

Are there data from the solar system available, that are about quantities we regularly investigate in exoplanet searches? The only collection I know of comes from this paper: "A Catalog of ...
Helen's user avatar
  • 399
2 votes
1 answer
288 views

The Poynting Robertson Effect

In the Poynting Robertson effect, it says in general, the Poynting Robertson effect is caused by the fact that objects like dust re-emit the light they absorb. Is that correct? Is this effect weak? ...
A Curious Mind 's user avatar
10 votes
1 answer
150 views

How is a Planet's Moment of Inertia Measured Remotely?

In the July 2023 issue of Sky & Telescope there is an article titled Sights Set on Uranus. In that article the following statement is made: Since the 1930's we've suspected that Uranus and ...
GrapefruitIsAwesome's user avatar
0 votes
1 answer
124 views

Have gas or dust or rock accumulated in our solar system on its 20 orbits around the Milky Way?

Also,does the absence of the accumulation of anything large such as rogue planets by the solar system suggest the Milky Way has been orderly and stable for billions of years?
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12 votes
2 answers
4k views

Does the Oort cloud have any large holes in it and if not does this mean nothing large has entered the solar system for a long time?

Would holes in the Oort cloud be a record of what has passed through it?
user avatar
15 votes
1 answer
553 views

What's the reason for the hollow region in Oort cloud?

Can someone please tell what caused the hollow space (pointed by yellow arrow) in the Oort Cloud? I understand that it is called cloud because the cluster of objects does not align with the major ...
Kevv Keka's user avatar
  • 161
3 votes
1 answer
86 views

How was this image of the faculae in the Occator crater obtained?

The picture in question (that I'm asking about) is at the bottom, of this post. Now, did they simply take a picture with reduced light intake? If so how much? 1/2, 1/4 or 1/8 or less? Or did they ...
Sven _Andersson's user avatar
5 votes
1 answer
681 views

Difference in results between JPL Horizons and cspice (rust-spice)

I am calculating the apparent planetary position of planets using the cspice library (I am specifically using rust-spice, which is a wrapper of cspice in Rust). when I calculate the same values in the ...
AviD1511's user avatar
  • 151
4 votes
1 answer
96 views

derivation of reduced magnitude of asteroids

I've noticed that there is this parameter called reduced absolute magnitude $V(\alpha)$ and it is defined as below according to the paper by Mahlke et al. 2021 https://doi.org/10.1016/j.icarus.2020....
mysterium's user avatar
  • 811
4 votes
1 answer
381 views

Does the Oort Cloud lose mass with time?

Can blocks of ice escape from the Oort cloud and away from the solar system forever?
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2 votes
1 answer
112 views

Motion of solar system around Milky Way

As our solar system performs its +-230 million year lap around the Milky Way, is the orientation of the ecliptic plane preserved independent of the center of our galaxy, or does the plane perserve its ...
DanO's user avatar
  • 21
15 votes
1 answer
4k views

Why is Mercury's orbit so unusual?

Mercury's orbit has the most eccentricity, 0.2, of all the planets. And this orbit is also the most inclined relative to Earth, 7 degrees. Edit: And to the invariable plane, it is inclined 6.35 ...
DrZ214's user avatar
  • 1,970
3 votes
3 answers
306 views

A solar system of solar systems

The moon orbits Earth, earth orbits Sol. It's true that Sol orbits the galactic center, but that's not what this question is about. Is it possible for a solar system like the Sol system, along with at ...
JBH's user avatar
  • 550
1 vote
1 answer
110 views

Does the Sun have different unique orbits around barycenters?

After reading this question and seeing its image I thought about this question I'm going to publish. Does the Sun have different unique orbits around the barycenter for its multiple planets? If yes, ...
Snack Exchange's user avatar
3 votes
1 answer
157 views

Cooling the early earth

My son had this theory that the icy comets cooled the hot earth during the late heavy bombardment. What do we know about this cooling effect on the early evolution of the earth? He intended his theory ...
user442920's user avatar

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