Unanswered Questions
167 questions with no upvoted or accepted answers
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Angular resolution of naked eye at night; type of vision used
It appears that most sources quote the angular resolution of the eye as 1', regardless of day and night.
For instance,
Naked eye
Seconds of Arc and the Unaided Eye
However, the following websites give ...
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7
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76
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What effect do aircraft have on night-time visibility?
I have something of an interest in astronomy. I also have a 5" reflector telescope, plus of course binoculars. With the recent coronavirus emergency, a large number of commercial aircraft were ...
6
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194
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What are the pros and cons of different types of echelle spectrograph cross-dispersers?
Echelle spectrographs, operating at high resolving power, typically consist of an echelle grating with a low numbers of lines/mm, used with high diffraction orders (often $n=$50-100). To separate the ...
- 30.7k
6
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Recreating Observer Ecliptic Lat/Lon from JPL Horizons using SPICE toolkit
I apologise if this is the wrong place to ask. I am trying to recreate part of the calculations by the JPL Horizons system using SPICE. Specifically the Observer Ecliptic Latitude and Longitudes.
I'd ...
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6
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What would go into the design of a simple sky quality meter, used to measure night sky brightness?
@MCG's answer mentions several methods to classify night sky quality or brightness, and goes on to say:
Additionally, you could always purchase a SQM (Sky quality meter) which is a small, portable ...
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119
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Need help understanding stellar spectroscopy data from ESO
The European Southern Observatory webpage has a web page that has tabular spectrogram data from A. J. Pickles, University of Hawaii. There are over 130 .dat files there. Each one represents a ...
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Viewing "Diamond Fuji"
Diamond Fuji is a phenomenon in which the (typically) setting sun is positioned directly atop Mt Fuji. Some relatively detailed predictions for viewing times at a nearby park are available here.
I ...
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What is this cluster of light trails captured on long exposure images?
I was taking photos of the Perseids meteor shower on 13/08/2022 in Peak District in the UK. The camera was fixed stably on a tripod, set on manual mode, taking 8-second exposures continuously.
When I ...
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Comparing Observing Techniques to Quantify the Effects of Starlink Satellites on Astronomical Observations
To take pictures of satellites I think I could use these methods listed below (are there more?)
Method 1
The satellites are tracked and their positions predicted. By utilising software tools and code ...
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457
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Why does titanium oxide around Betelgeuse produce this particular sawtooth-shaped absorption spectrum?
Betelgeuse Just Isn’t That Cool: Effective Temperature Alone Cannot Explain the Recent Dimming of Betelgeuse suggests that the recent dimming might be caused by increased optical absorption by dust ...
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What EM spectrum can stars be most cheaply observed using Remote Sensing during the day?
I would like to augment my GPS navigation with remote sensing of 'the sky.' I am looking for any astronomical body that can be perceived during the day.
Maybe Pulsars emit something easily detected, ...
CommunityBot
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Can a meteor streak exhibit different colors denoting presence of more than1 element?
A meteoroid's elemental composition can be determined by the color it exhibits while burning in the earth's atmosphere which we also call a "meteor". However, is it possible that a meteor ...
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Calculation of average FWHM by PSF fitting of all the detected stars in the fits image
I need to calculate the FWHM of all the stars detected via the DaoStarFinder package/any other package by performing PSF fitting in Python. Here is the code for my detection.
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Fitting a line or polynomial to optical and radio SEDs
I've been trying to fit functions to plots showing photometric data for AGN from both optical and radio measurements, such as:
but my supervisor says that this shouldn't be done; the radio and ...
- 126k
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553
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How to measure the latitude of the moon?
In the geocentric solar ecliptic (GSE) system of coordinates, the position of the Moon is described by its longitude and latitude. The former is, with great accuracy, the angular distance between the ...
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