# All Questions

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### Python controllable amateur astrophotography cameras?

I would like to read further about any successes that amateur astrophotographers (or professionals) have had with USB CCD cameras that are controlled by Python scripts. I'd like to script the setting ...
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### I sighted a group of satélites moving in a interesting pattern in a way I never seen from this area where I live is this posible?

I live in the rural area of the state of São Paulo in brasil (mata atlántica). the sky is absolutely clear, when there is no clouds you see the milky way perfectly and a sky full of stars. I just ...
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### I saw something move in the sky and i am not sure what it was :( [duplicate]

I saw a little light from between two stars(it had the same size as the star) moving in a straight line and then it went from one side of the moon and came out from the other end(i am not sure but i ...
32 views

### To find the temperature of star during gravitational collapse [closed]

A star has electron like gas composition which is by some constraint restricted to move in x-y plane only. If ‘ρ’ is density of the gas inside star, find the temperature during gravitational ...
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### How can the radius of a star be measured using parallax?

The radius of Betelgeuse was measured using parallax. From the Wikipedia article: the estimated parallax from the Hipparcos mission was 7.63±1.64 mas, yielding an estimated radius for Betelgeuse of ...
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### Sun, Moon: Relative Distance from Crescent?

This is more a question about the history of astronomy. It recently occurred to me that you can estimate the ratio of earth-moon and earth-sun distance in the following way: We can look at the ...
21 views

### Python interface for DMK 23U274 USB camera for astrophotography

I have access to a monochrome USB camera (DMK 23U274, The Imaging Source) and I'd like to record focal plane images from a small telescope with a python script that would control it by setting ...
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### Superconducting space dust; what transient fields could induce persistent current loops?

Science Alert's Superconductivity Has Been Discovered in Meteorites For The First Time quotes from Superconductivity found in meteorites (Wampler et al. PNAS March 23, 2020) The paper describes the ...
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### Do Satelites travel in train like formation? [duplicate]

This morning approx 5.30am i seen roughly 12 travelling in perfect formation approx 15cm apart , im 200km south of sydney Australia travelling from a north west direction
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### How do K, F, A and B stars die?

I know that M (red dwarf) main-sequence stars slowly fade to white dwarf stars, and that G (yellow dwarf) main-sequence stars become red giants and then shed their outer layers in a planetary nebula ...
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### How accurate should sun\moon ephemeris be for calculating eclipses?

I am writing a program to simulate eclipses for about -2000 to 6000. My question is, how accurate does my ephemeris for the sun and moon have to be to get a decent accuracy for eclipses? I currently ...
2k views

### How is Uranus' north pole defined?

The rotation axis of the planet Uranus is tilted by 98° compared to its plane of orbit. This means that the north pole of Uranus is "under" the ecliptic compared to the north pole of other planets. ...
50 views

### Right Ascension to Zodiac House

At the moment (01-04-2020 09:36) the Moon is situated in Gemini: "The Moon is currently in the constellation of Gemini. The current Right Ascension is 06h 37m 56s and the Declination is +23° 42' 09”."...
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### Neutrino Modelling in Friedmann Equation

so I'm trying to model neutrinos in the Friedmann Equation. I've covered the case of the Benchmark Model where we have matter, radiation, curvature, and the cosmological constant, Lambda. I know my ...
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### Deducing the hour based on RA

I'm making a technological project. The goal is to write a program that gets an image of the nightsky and predicts the hour in which the photo was taken. I implemented a well-known method using the ...
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### Paper recommendations for career guidance

I'm an undergraduate student in astronomy and I'm one year from graduating, but I feel I still can't choose what career path I want to pursue. To date I've only had two courses of proper astrophysics ...
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### Is it correct to say vertical conjunction?

This question is related to this one: Are we seeing a conjunction these mornings? Last Feb 27, the a reporter said that, the day before, at sunset, Venus and the Moon were in vertical conjunction. Is ...
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### Astronomical Term *Mezzocielo*

What is the name of the point of intersection of the great circle passing through the celestial north pole P and the Zenith Z, with the celestial equator? (Point T in the figure) In Italian this ...
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### Galaxies stay at same place but it's the space that splits the galaxies apart

Galaxies stay at same place but it's the space that splits the galaxies apart. Is my understanding correct? As per my understanding. Galaxies moving apart at high speed is due to the increase in ...
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### What's so interesting about Coma-type galaxy clusters?

When the dynamical mass of a proto-cluster of galaxies is ~(1-2)x1014 Msolar, the proto-cluster is expected to evolve into a coma-type cluster. In almost every paper I read about the confirmation of ...
94 views

### Is it possible make artificial gravitational waves?

Is it possible to generate gravitational waves (creating low or high disturbance in space-time) from very heavy bodies spinning at very high speed artificially?
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### Is this a potential planetary setup for the Alpha Centauri System?

I originally posted this on the World Building SE, but I was suggested to post it here for a better answer. I am attempting to create a [semi]plausible star system in Alpha Centauri for a series. The ...
46 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 ...
56 views

### If a black hole pulls every object in the universe, why there is a light around it?

I've seen some black hole images and I've seen some movies about it e.g(interstellar). I wonder why it has a light around it. Even if I know that light can't escape through it. Can someone enlighten ...
84 views

### Is the equinox absolutely true east everywhere?

I've read that only only in the equinoxes do you get to see the sun rise in the exact east regardless where you might happen to be. However I think this is not absolutely true everywhere, but only in ...
3k views

### During an eclipse, how big is the shadow of the moon on the earth?

This picture was taken from the ISS during a solar eclipse. You can see the shadow of the Moon on the surface of the Earth. But how big is this shadow? How many kilometers is its diameter?
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### How does the specific angular momentum - mass relation arise?

I'm reading about the specific angular momentum - mass relation of galaxies, and I'm confident I understand what the possible reasons are for the difference in specific angular momentum of ellipticals ...
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### Replenishing hydrogen in the core of the sun

How is hydrogen supplied to the core of the sun? Shouldn't the radiative zone prevent this? Shouldn't heavier helium fill the core? How much of the hydrogen can the sun fuse?
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### Distance to star using color index

I'm doing the following question: A star is observed with UBV magnitudes $m_u = 16.31$, $m_b = 14.52$, $m_v = 13.76$. Spectral analysis gives $M_{bol} = 7.31$, $BC = -1.02$, $(U − B)_0 = 1.222$. ...
1k views

### Can you provide a visual description of the sun rise?

The Sun rises in the east only two times a year. The other days, the Sun rises in the east, but a little bit to the north, or to the south. How can you know the degree of how much north or south it is?...