Visibility of comets during their outbursts and the night sky light pollution—Use the Bortle scale

Gronkowski, P.; Tralle, I.; Wesołowski, M.

doi:10.1002/asna.201713387

Cited by 25 publications

(9 citation statements)

References 43 publications

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“…Based on the model presented briefly, we can determine the thermodynamic parameters on the surface of the cometary nucleus. These parameters were used to determine the amplitude of the change in cometary brightness based on Pogson's law (Gronkowski et al 2018;Wesołowski 2019Wesołowski , 2020dWesołowski et al 2019Wesołowski et al , 2020bWesołowski et al , 2020c. However, in this paper we will use an expanded form of Pogson's law…”

Section: Physical Model Of the Cometary Outburst Phenomenonmentioning

confidence: 99%

The Evolution of the Nucleus Surface in the Context of the Change in the Brightness of a Comet*

Wesołowski¹

2022

Res. Astron. Astrophys.

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The paper presents a model of the thermodynamic evolution of the comet nucleus surface. In the proposed approach, we focus on the analysis of the formation of pits visible on the surface of the cometary nucleus. These pits are a consequence of the thermodynamic evolution of both the surface layers and the inner layers of the cometary nucleus. As a result of complex thermodynamic processes, the surface layer is destroyed. A measure of this destruction is the amount of comet material that is thrown into a coma as a result of sublimation. The effect of this process is an increase in the area on which the incident light scatters. Then we can notice a sudden increase in the brightness of the comet, i.e. its outburst. A measure of the amplitude of a given outburst is the diameter and thickness of the surface layer that has been destroyed. The mechanism of the evolution of the pits was proposed based on the analysis of many photos taken by the Rosetta probe. The obtained numerical values correspond to the actual brightness changes of the Jupiter family comets during their outburst.

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Section: Physical Model Of the Cometary Outburst Phenomenonmentioning

confidence: 99%

The Evolution of the Nucleus Surface in the Context of the Change in the Brightness of a Comet*

Wesołowski¹

2022

Res. Astron. Astrophys.

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“…In the other words, the 7th magnitude sky is the most primitive dark sky. In 2001 Sky and Telescope, John Porter divided the night sky into magnitude 1 to 9 by visual inspection to measure the sky glow [24][25][26] , and thus to reflect the influence of light pollution on the sky. Generally speaking, the classification of the night sky provides a simplest and most direct method to evaluate the degree of light pollution in the night.…”

Section: The Cause Of Sky Glow At Nightmentioning

confidence: 99%

Study on the Change Characters of the Urban Spatial Light Pollution from Ground to Zenith

Liu¹,

Baogang²,

Hao³

et al. 2018

Preprint

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As the problem of light pollution becomes more serious, more and more scholars pay attention to this issue and carry out related research. In the perspective of cities, the measurements of light pollution mainly focus on the brightness of the sky or artificial lighting on the ground. However, there is lack of research on the whole urban space. With the two-dimensional brightness analyses, this paper processes the changes of the light environment of the whole urban space into image quantization. It gets the 3D and 2D light environment changes of luminance distribution, color temperature distribution and chromaticity in the three space layers, the ground layer, the urban canopy layer and the sky layer, from dusk with natural light to night with artificial lighting completely. It is found that the brightness difference between the light environments among the three city levels gradually reduces with the measuring time, and the final values maintain at 0.11~0.25 cd/m2. In the ground layer, the light environment is mainly affected by the lighting facilities, and vegetation can prevent the light from scattering up. The light environment of the urban canopy layer is the brightest in the whole city space and has the largest influence on the sky layer. The color concentrates in the range of yellow and red. The color temperature near the ground distributes in 3000K~15000K, and near the sky distributes in 2300K~2700K which is warmer than the natural night sky. The sky brightness of Dalian city is about 951 times than the natural night sky. 

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“…The simplest reason is actually due to the world population being accumulated in or around the cities (Falchi et al 2016). Light pollution in the night sky makes observations of astronomical objects very difficult when cumulative light above the large cities degrade the quality of observations especially for the observatories (Gronkowski et al 2018). Light pollution is also an ecological problem besides its negative effect on astronomy (Navara & Nelson 2007).…”

Section: Introductionmentioning

confidence: 99%

The Temporal Analysis of Light Pollution in Turkey using VIIRS data

Yerli,

Aksaker,

Bayazit

et al. 2021

Preprint

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Artificial Light pollution (AL) in Turkey and in Turkish observatories between 2012-2020 have been studied using the archival data of Visible Infrared Imaging Radiometer Suite (VIIRS) instrument. The astroGIS database has been used in processing the data (astrogis.org) Aksaker et al. (2020a). The total energy released to space from Turkey increased by 80% in 2019 with respect to 2012. In the span of the dataset, a steady and continuous increase has been observed throughout all cities of the country. On the other hand, Dark Sky Park locations, East and Southeast Anatolian regions and mostly rural areas around the cities kept their AL level constant. Four demographic parameters have been studied and they were found to be correlated very well with AL: Population (R 0.90); GDP (R 0.87); Total Power Consumption (R 0.66) and Outdoor Lightening (R 0.67). Contrary to countries acting to prevent AL increases, Turkey seems to be at the beginning of an era where AL will arithmetically increase throughout the country and enormous amount of energy will continuously escape to space and therefore will be wasted. Therefore, a preventive legislation, especially for invaluable astronomical site locations such as TURAG, TUG, DAG and C ¸AAM where each is counted as a truly dark site due to their SQM values, has to be enacted in Turkey, in very near future.

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Visibility of comets during their outbursts and the night sky light pollution—Use the Bortle scale

Cited by 25 publications

References 43 publications

The Evolution of the Nucleus Surface in the Context of the Change in the Brightness of a Comet*

The Evolution of the Nucleus Surface in the Context of the Change in the Brightness of a Comet*

Study on the Change Characters of the Urban Spatial Light Pollution from Ground to Zenith

The Temporal Analysis of Light Pollution in Turkey using VIIRS data

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