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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How can one quickly screen a disk galaxy dataset for large-scale asymmetry?
I am looking for practical ways to quickly assess whether a disk galaxy dataset
shows large-scale asymmetry (e.g. possible stress-driven or lopsided structure)
before doing any detailed modeling.
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How do I definitively determine if the anti-tail of 3I/ATLAS is a perspective effect?
A tantalizing aspect of 3I/Atlas (or C/2025 N1) is its ''anti-tail'' seen in post-perihelion images, with some arguing it isn't a perspective effect.
Whereas an anti-tail had been seen for solar ...
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Find Extreme UV data source for the Sun
I have been struggling to find the Extreme ultraviolet data from the Sun, taken in January 1999. I have already searched NOAA, NASA etc. every places, but not able to find anywhere.
One thing note ...
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What software can I use to calculate Haumea’s luminosity as viewed from the earth?
Haumea is very interesting since it has an orbital period of centuries, but a day on Haumea is just 4 hours.
What software can I use to calculate Haumea’s luminosity as viewed from the earth?
I think ...
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Are these red dots in the Vera C. Rubin Observatory skyviewer instrumental noise/extreme low signal data?
Hi everyone, first time posting here. I was wondering if what I am looking at one the Vera C. Rubio observatory skyviewer.app is instrumental noise/extreme low signal data or if it is something else. ...
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Observation shadowing (multi-detector) and livetime scaling
I'm doing a rates analysis on two different transients that may or may not be related to each other. My supervisor has told me that it's perfectly valid to scale the detection rate (per day) of one ...
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Why is Lomb Scargle detect a stronger peak at a harmonic of the true period?
As you can see there is a strong peak at 1.44 days. There is another peak at 3.05 days (which is the close to the actual period (2.89 days) from the literature). My question is why the harmonic of the ...
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How to use the data type given in .LBL file correctly in python?
I am trying to make a plot of radiance from a raw data file of DAWN VIR data (.LBL and .QUB files used). But for some reason I am unable to do so. The plot doesn't make sense. I am unable to find ...
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A good, up-to-date review of all periodicity discovery techniques (folding, etc.)
The excellently written January 2010 AstroBetter Wiki Periodicity Analysis already has some dead or now-unhelpful links, and certainly with the data explosion in the last 15 years and intensified ...
user7982
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How to pPXF a galaxy spectrum containing Nans?
I am trying to pPXF a spectrum with Nans at the beginning and end, pPXF gives the error "GALAXY must be finite".
While I could just trim the spectrum, I will be processing spectra with Nans ...
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Where Can I Find the Odewahn et al. (1992) Star/Galaxy Dataset?
I am looking for the dataset used in the paper "Automated star/galaxy discrimination with neural networks" by Odewahn et al. (1992), published in The Astronomical Journal (DOI: 10.1086/...
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Where to publicly access full UNION 3 SN dataset?
I am trying to import the full UNION 3 SN dataset (https://arxiv.org/abs/2311.12098), I so far found only this github repository https://github.com/CobayaSampler/sn_data. Unfortunately, there they ...
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How to Replace Bad Pixels with Proper Values When Using SWarp?
I am currently using SWarp for image stacking and have encountered an issue with bad pixels, as shown in the attached DS9 image. These bad pixels have negative values, and I’d like to replace them ...
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What difficulties still exists in astronomy that could be solved (partially) with Machine Learning?
A reminder of Machine Learning :
ML is used to approximate a function, so we can use it to :
Approximate a function in order to accelerate a calculation but with less quality
If we don't have a ...
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Need help on random sample of stars, GAIA ADQL code
I need to get a sample of random stars and the GAIA DR3 and Astrophysical parameters data, but I can't seem to figure it out. No matter what I do, they are always ordered one way or another (by either ...
