Questions tagged [data-analysis]

Analysis of data is a process of inspecting, cleaning, transforming, and modeling data with the goal of discovering useful information, suggesting conclusions, and supporting decision making.

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2answers
110 views

What are the present, and potentially the future roles of data scientists in Astronomy? [closed]

I am a data scientist and curious about their roles in modern Astronomy, both now, and in the near future. What are type of roles and projects where data scientist are most active in Astronomy? What ...
2
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1answer
274 views

Dataset for globular star cluster

Where can I find the dataset(s) for a globular star cluster? The datasets should have the coordinates, color index (for different wavelengths) , magnitude etc. of every star in the cluster. I want ...
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0answers
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Plotting GAIA barycentric radial velocity data with python

Does anybody know of a good tutorial on how to use python and astropy to generate plots of GAIA, RAVE or any other database of barycentric (heliocentric) radial velocity data of stars in our galaxy? ...
2
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3answers
309 views

Catalog of Galaxies in the Visible Universe

I have seen the Gaia project from here which is about mapping the stars in the Milky Way galaxy. But I'm wondering if there is any open data on the positions (or something like "positions" since it ...
2
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1answer
87 views

Searching for stars with a given surface temperature and an absolute magnitude?

Do you have in mind any database/sites that I can search for stars that matches a given surface temperature and an absolute magnitude? For example, when I enter ...
-2
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1answer
165 views

Is the orbit of Sirius B based on observation, or derived from the variation in proper motion of Sirius A?

It is common to base models on deduction rather than empirical observation. The orbit of Sirius A is easily seen as variation in proper motion. The orbit of Sirius B, has it been observed, or is it ...
2
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2answers
2k views

Fitting PSF to an image to get total flux (Python)

I have an image of a single unsaturated source (asteroid) that I'd like to fit guesses for various model PSFs to, so that I can then compare the total flux in each case. I've only recently begun ...
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1answer
119 views

Which star with a Bayer designation is the farthest from the Sun?

The key to finding the answer seems to involve processing data from astronomical databases, which I'm not sure how to do in this case. I'd prefer to limit the answer to the original list of ...
3
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2answers
426 views

Dataset containing list of known globular clusters

Does anybody know if there is an existing dataset that consists of all known star clusters, their name, and their apparent dimensions or similar? Is it possible to make a query to, or download all ...
2
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0answers
82 views

Efficiently calculating power spectra from galaxy catalogs

I am dealing with a problem which requires calculating either the correlation function or the power spectrum. At times, the 2-point-correlator seems the better route, at others, the PS. Right now I am ...
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0answers
328 views

Correctly scaling Power Spectrum and Correlation Function of Galaxies from Mock Catalogues

I'm currently writing a code to compute the two-point correlation function of a set of galaxies. As I work with a loooot of galaxies, it was suggested to me not to do it in real space, but to compute ...
5
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1answer
603 views

Generating random galaxy catalogs for correlation functions

The galaxy correlation function, when computed directly from a galaxy catalog, relies on computing a randomly generated counterpart catalog. When dealing with a simulated galaxy mock-catalog, where ...
2
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1answer
57 views

Where can I find source data for the graph of metric expansion over time, as shown in this ESA web page?

This web page from ESA/Hubble, shows the size of the universe over time. (I know that "size of the universe" is a gross simplification and open to multiple definitions and ambiguity, but this kind of ...
4
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1answer
920 views

Tests for code that computes two-point correlation function of galaxies

I'm currently writing a code to compute the two-point correlation function of a set of galaxies. As I work with a loooot of galaxies, it was suggested to me not to do it in real space, but to compute ...
2
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1answer
58 views

Obtain IR diffuse data from WISE

I need some help obtaining IR background diffuse data from the WISE observation. There is already some work done in this regard; see: http://wise.skymaps.info/ . These are .fits files. How do I find ...
2
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0answers
130 views

How to calculate the various properties of a star?

I am wanting to plot a velocity profile (a plot of velocity against the star's distance from the galactic core) from the Gaia DR2, but so far my efforts have been disappointing. The information I ...
3
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1answer
126 views

Locating a star cluster on a Hertzsprung-Russell diagram with other color index

Recently I took pictures of the NGC 884 cluster in the B and I bands and selected some 30-what stars from them. I've reduced the data to a colour-magnitude diagram (absolute magnitude in the I band $...
2
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2answers
181 views

Understanding expected TESS data structure

I'm interested in trying to use the data that will be returned by TESS to apply some machine learning/computer sciences concepts. I'm not sure yet what I want to try to do with it (though I have some ...
2
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0answers
94 views

Asteroseismology; recordings of star vibrations duration and data availability?

A short video titled "Why Tess is recording the "sounds of stars" at the bottom of the page of the BBC News article Planet-hunter launches from Florida gives a short description of Asteroseismology by ...
4
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1answer
246 views

What is equation of straight line for a ideal blackbody on the color color diagram?

The color-color diagram is a plot between $U-B$ vs $B-V$ values. For a ideal blackbody, what is the equation of this line? In other words, what does the linear relation between $U-B$ and $B-V$ look ...
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1answer
388 views

Why are the spherical and cartesian galactic coordinates in the ATNF Pulsar Catalogue different?

I am trying to relate Galactic Latitude (b) and Longitude (l) (spherical coordinates) to galactic cartesian x,y,z coordinates in the ATNF pulsar catalog. This query shows some sample data with ...
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0answers
165 views

How to trim CCD overscan and amplifier turn on/off regions

I have begun reducing images I collected with a telescope and CCD detector. I read in the the "Handbook of CCD Astronomy" by Howell that I need to trim overscan regions (as well as possible amplifier ...
4
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3answers
912 views

Observed lunar distance data?

Where can I find free/open data for the observed (not calculated/theoretical) distance between the Earth & Moon? I want to see the observed distance of the Moon, hour by hour.
2
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0answers
337 views

How does the ESPRESSO Echelle spectrograph fold the spectrum so nicely?

The CBC News Technology and Science Q&A This ESPRESSO machine doesn't make coffee but scans the skies for habitable planets includes a nice description of ESPRESSO (Echelle SPectrograph for Rocky ...
4
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1answer
330 views

Strong Gravitational Lensing Dataset

I'm a Machine Learning Student and I'm working on Strong Lensing Image Classification. this is a hot topic nowadays but strangely after days of searching and communicating with different people I ...
7
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1answer
310 views

What does the active area on a typical CCD based detector look like?

Pixel based detectors, particularly optical CCDs like what was used in the SDSS camera, are ubiquitous in astronomy. Is there any dead area on the detectors? Not the obvious gaps between each ...
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2answers
279 views

Problems with FITS headers

I'm working with some NEOWISE images that seem to have incomplete header tags. I've been advised by the SAO (because I'm using DS9 to view them) that I have "a partial PC matrix defined, yet it does ...
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2answers
4k views

Where can I find a visible star dataset?

I'm trying to do a project for a databases class where I have a user enter their current location and I tell them what constellations/planets/etc are visible in their area. I've seen this data ...
2
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1answer
999 views

where to obtain ephemeris data for geodesy satellites?

Is anyone aware of where one can obtain ephemeris data in Geocentric Celestial Reference Systems (GCRS) coordinates for a geodesy satellite such as LAGEOS (It doesn't really matter which mission)? Or, ...
2
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2answers
119 views

Stuck with SDSS data [closed]

I want to do project on astronomical dataset. Regarding that project, I try SDSS who give public dataset but it is quite complicated for me. I gone through public dataset and downloaded some .FITS ...
2
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2answers
907 views

Practicing image processing and analysis

I'm just getting into image processing and analysis using Python, and I'm looking for astronomical images (preferably raw, unprocessed images) to practice on. Can anyone suggest some places I can ...
3
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2answers
372 views

How to find period of a pulsar from a given time sampled voltage data?

I've a data file with 2 columns, each containing time sampled voltage output (a sequence of real numbers) from a radio telescope, so there is a pair of telescope which are measuring the signal here. ...
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0answers
226 views

Are there any ready-made machine-learning datasets of photometric data that are easy to use?

Disclaimer: I have a Machine Learning/Computer Vision background, not Astrophysics, so please be a bit patient with me. If you feel like this question is too far out there it would be great if you ...
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1answer
232 views

Image processing techniques to distinguish between stars and galaxies in an image? [closed]

Say I have an arbitary image of stars and galaxies without any extra information (no other spectra info other than image itself). Can you help me distinguish them? Are there any specific features / ...
1
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1answer
112 views

I want a galaxy count database, also how do I use SDSS skyserver to fetch galaxies?

I'm new to all this and trying to implement galaxy counting. For the initial stage I need raw image data, that is images with galaxies and stars along with a count of how many galaxies there are in ...
3
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2answers
166 views

Observation of Gravitional waves by LIGO from binary black hole merger

I read the paper "Observation of Gravitational Waves from a Binary Black Hole Merger" https://physics.aps.org/featured-article-pdf/10.1103/PhysRevLett.116.061102 I tried to understand all the graphs ...
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1answer
84 views

Are there more images with different filters available for the April 6 Hubble image of Jupiter?

This recent HST image of Jupiter near opposition is described here and here and was made under HST proposal 14756. It was taken with WFC3/UVIS. It is made from three images using narrow-band filters ...
5
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1answer
147 views

What caused instant jumps and exactly flat periods in Kepler's light curves?

Last 65 days of Kepler's light curve for the infamous KIC 8462852 star is shown below from the published paper's graph. Skip the dips here, I wonder about two other features: Day 1559, during a ...
3
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3answers
1k views

Python with image in fits format

I'm trying to write a Python program that will do the following: take an image in fits format and a reg file with a list of regions in the sky, and determine which regions in the list are inside the ...
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0answers
33 views

Error associated with Sersic Profile calculations?

I am working on a Bayesian analysis project for class using data I gathered some data from NASA's Sloan Atlas (http://www.nsatlas.org/). One of the variables I am dealing with is the Sérsic Index (...
4
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1answer
226 views

Why is the moon's motion more complicated than that of those planets?

I am of course not an expert on astronomy. But from the literature, I have the impression that the lunar motion is very complicated. It seems that Kepler can make sense of the motion of the planets ...
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0answers
46 views

Tracing back OMNI data to the sun

I have been reading the OMNIWeb data documentation in order to clarify one particular question without success. I need to associate each measurement in the OMNI dataset to a moment in time at the sun (...
2
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0answers
35 views

Any benefit for analyzing the depth of craters across the surface of a planet?

I would like to know what conclusions one could draw from mathematically analyzing the depth of various craters across the surface of a given planet, and then relating that to their position on said ...
2
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1answer
56 views

Detector Pixel Geometry?

When analyzing an image I'm used to thinking of the pixels as a grid of boxes the photons have fallen into. I assume that there's zero space between the boxes. That seems obviously wrong, since there ...
0
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1answer
116 views

If a star orbited another star, how would that affect parallax measurements of the other star from the vantage point of the first?

Example: If hypothetically, the vantage point would move 2AU along an orbit around the star being measured, would that make it seem as if the other star moved twice the distance over the back-drop?
2
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1answer
269 views

Getting light curves from Kepler/K2

Hello I'd like to ask what are steps to get a light curve wfrom Kepler/K2 database. Let's say I'd need to get light curves of 10 random K type stars. How should I access the databases and what should ...
2
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0answers
61 views

Visible Light Ground-Based Solar Observatory Data Archives?

I'm mainly searching for the best(or good/significant/important) solar data archives via ground-based telescopes. If I'm not being very straightforward... Say if I wanted high quality/resolution ...
2
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0answers
83 views

Where can I find raw text, ascii, or binary data from the GALEX satellite?

I am looking for stars in the GALEX data through the GALEX data using GALEXview and plugging in their Henry Draper Numbers http://galex.stsci.edu/galexview/ But the task is tedious by hand. Is there ...
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1answer
92 views

Astronomy online degrees

I have a masters degree in computer science and statistics but would like to advance my knowledge in astronomy, ideally in getting some kind of online degree. Does anybody have experience, ...
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1answer
184 views

Rebinning with a non-integer factor

I'm in doubt whether I should put this in the astronomy or rather the coding exchange, but since my interest goes out to the former I will try my luck here. Suppose I have an image with a certain ...