Geometric albedo

They are derived from Hubble data by measurements of the white dwarf companion characteristics (Sigurdsson et al, 2003) pulsar is in a binary system (period = 191.4428 d.) with a 0.6 M white dwarf companion (Thorsett et al. 1999); this explains the uncertainties in the fitting of the planet parameters. Planetary Systems Around White Dwarfs.

V is the geometric albedo in the V band. The constant parameter C V is usually taken to be C V = 1329 km (for example, see the derivation in Pravec & Harris 2007). The de nition of geometric albedo is the ratio of the true scattering of light by the surface compared to an ideal scatterer, here a disk of area ˇr2 = ˇD2 4 that is 1 AU from the ...The measurement of bidirectional reflectivity for ground-based objects is a highly intricate task, with significant limitations in the capabilities of both ground-based and satellite-based observations from multiple viewpoints. In recent years, unmanned aerial vehicles (UAVs) have emerged as a novel remote sensing method, offering convenience and cost-effectiveness while enabling multi-view ...Geometric albedo A g (λ) is the ratio of the reflected flux F p (λ, α = 0°) of an object at full phase (α = 0°) to the flux from a perfect Lambert disk, F ☉,L of the same radius R p under the same incident flux F ☉ at the same distance d from the star. A planet's phase angle α is the angle between the incident ray from the star to ...Albedo is ratio of the light received by a body to the light reflected by that body. Albedo values range from 0 (pitch black) to 1 (perfect reflector). Technical Definition. Geometric albedo is the ratio of a body’s brightness at zero phase angle to the brightness of a perfectly diffusing disk with the same position and apparent size as the body. Mean values at opposition from Earth Distance from Earth (equator, km) 378,000 Apparent diameter (seconds of arc) 1896 Apparent visual magnitude -12.74 * These represent mean apogee and perigee for the lunar orbit, and were used for calculating the maximum and minimum velocities.The physical and thermal properties of the asteroid are relevant for establishing the scientific mission goals and also important in the context of near-Earth object studies in general. Aims: Our goal was to derive key physical parameters such as shape, spin-vector, size, geometric albedo, and surface properties of 162173 (1999 JU3). Methods ...

The geometric albedo is 0.38, which is significantly greater than previously reported estimates of 0.17-0.24 that were based on effective diameter estimates from 620 to 800 m ...zero, relative to a Lambert surface viewed normally observed at the same geometry [Hapke, 1993]. In astronomical terms, this angle is termed the phase angle, and this viewing geometry is called zero phase. Normal albedo is a special case of the quantity I/F,defined as the ratio of the measured radiance I to theThe albedo of a celestial body is the fraction of light reflected by it. Modern astronomical facilities enable the measurement of geometric albedos from visible/optical secondary eclipses and the inference of the Bond albedo (spherical albedo measured over all wavelengths, weighted by the incident stellar flux) from infrared phase curves of …infer geometric albedos for the planets with a detected occulta-tion, while being careful to account for the thermal contribution to the total occulted flux. For planets with dayside temperatures below 1500 K, they find that with increasing temperature the geometric albedo decreases because fewer condensates are cre-ated in the atmosphere.The geometric albedo of a population of around 20 hot gaseous exoplanets have been measured by studies such as Angerhausen et al. (2015) and Esteves et al. (2015), with the finding that the ...Values for the geometric albedo and the phase function (at 37phase angle) are also obtained for both the atmosphere and the ground for central meridian - 0 The south polar cap in September 1973, was nearly circular with a radius of about 8(heliocentric longitude = 0 and a geometric albedo of 0.68 (red), 0.68 (yellow), 0.60 (green), and 0.53 (blue).

Our new observations indicated that this asteroid has a polarimetric inversion angle of ~21 deg, absorption bands around 0.9 and 1.9 um, and a geometric albedo of 0.285 +- 0.083. All these features are consistent with those of S-type but inconsistent with L-type. Based on this evidence, we conclude that JAXA's Hayabusa2# spacecraft will explore ...Given an observed geometric albedo our prescriptions can be used to estimate the underlying scattering albedo of the atmosphere, which in turn is indicative of the scattering and absorptive properties of the atmosphere. We also study the dependence of polarization in Rayleigh scattering atmospheres on the orbital parameters of the planet-star ...The geometric albedo, phase integral, and Bond albedo are fundamental optical characteristics, which can be used to better understand the surface properties of Enceladus (e.g., Buratti and Veverka, 1984; Verbiscer et al., 1990, Verbiscer et al., 2005, Verbiscer et al., 2006; Verbiscer and Helfenstein, 1998). The monochromatic Bond …Geometric albedo is the ratio of a body’s brightness at zero phase angle to the brightness of a perfectly diffusing disk with the same position and apparent size as the body. Examples Our Moon has a very low albedo (0.07), while Venus has a high albedo (0.60). Saturns geometric magnitude and albedo were determined by Mallama et al. (2017, Icarus 282, 19-33). That analysis depended largely on photometric data obtained when the ring system interfered with observations of the globe. In this study the magnitude and albedo are re-evaluated based onGeometry function: describes the self-shadowing property of the microfacets. When a surface is relatively rough, the surface's microfacets can overshadow other microfacets reducing the light the surface reflects. ... Albedo: the albedo texture specifies for each texel the color of the surface, or the base reflectivity if that texel is metallic ...

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The Bond albedo ( A) is related to the geometric albedo ( p) by the expression. where q is termed the phase integral and is given in terms of the directional scattered flux I ( α) into phase angle α (averaged over all wavelengths and azimuthal angles) as. q = 2 ∫ 0 π I ( α) I ( 0) sin α d α. The phase angle α is the angle between the ... In Fig. 6, we have plotted the wavelength depen- dent geometric albedo A G and the Bond albedo A B of a Jupiter- like planet as calculated with (3 × 3) and without (1 × 1) polar- ization. ...Albedo features are regions on a planet or moon with a noticeably higher or lower albedo than their surroundings. Mars and Mercury show such features. A body's geometric albedo compares light specifically reflected back toward the source to that which a disk of the same diameter would reflect in that direction if it were a totally diffuse ...Geometry and albedo fusion. After the computation of the camera pose and the albedo maps, we have to fuse the geometry information given as depth maps provided by the sensor and the estimated albedo map to a consistent scene model. For this purpose, we developed a fusion pipeline inspired by the VoxelHashing technique by Nießner et al. (2013).Download scientific diagram | Geometric Albedo, Phase Integral, and Bond Albedo of Pluto Excluding from publication: Characteristics of Pluto's Haze and Surface from an Analytic Radiative ...We derive an upper limit on the reflected light component, and thus, on the planetary geometric albedo A g . The 97.5% confidence upper limit is A g < 0.2. This is the first albedo constraint for HAT-P-32 b, and the first z' band albedo value for any exoplanet. This finding disfavors the influence of large-sized silicate condensates on the ...

Technical Definition. Geometric albedo is the ratio of a body’s brightness at zero phase angle to the brightness of a perfectly diffusing disk with the same position and apparent size as the …Albedo geomètrica. La correlació entre l' albedo geomètrica ( albedo astronòmica ), [1] la magnitud absoluta d'un planeta menor i el diàmetre ve donada per l' equació : , on és l'albedo astronòmica, és el diàmetre en quilòmetres, i H és la magnitud absoluta d'un planeta menor. [2]Jan 15, 2021 · This quantity is somehow analogous to the geometric albedo p and may be called equivalent geometric albedo. 3.2. Cautions and underlying hypothesis. When comparing calculated zero-phase reflectance and equivalent geometric albedo from our work to asteroid observations, there are some strong underlying hypotheses that the reader needs to keep in ... Ví dụ về cách dùng "geometric albedo" trong một câu từ Cambridge Dictionary LabsWe present for the first time relative albedo maps of Titan's surface. The maps were made from images taken by the Hubble Space Telescope's ... 1.28-, 1.6-, and 2.0-μm windows which show variations with the orbital phase, implying variability of the satellite's geometric albedo, … Expand. 104. Save. Direct detection of variable tropospheric ...Finally, we derived the geometric albedo of the smooth component of interplanetary dust, assuming big particles, and obtained a geometric albedo of 0.06+-0.01. The derived albedo is in accordance with collected dark micrometeorites and observed cometary dust particles. We concluded that chondritic particles are dominant near Earth space ...Geometric Albedo · Golden Diamond · Book Appointement · Custom Design Questionnaire. Search. "Close (esc)". View more. Geomeric Albedo. Filter (1). 11 products.A hybrid geometric optical-radiative transfer approach for modeling albedo and directional reflectance of discontinuous canopies Abstract: A new model for the bidirectional reflectance of a vegetation cover combines principles of geometric optics and radiative transfer. It relies on gap probabilities and path length distributions to model the ...The normal, reflective or geometric albedo is a measure of a surface's relative brightness when illuminated by solar light and with the observations being ...The geometric albedo for the primary is 0.17-0.18, considerably lower than infrared-based estimates of 0.30-0.40. Mass and density. The total mass of the 1991 VH system is (1.58 ± 0.08) × 10 12 kg, based on the orbital motion of the satellite.

Definition. An albedo feature is a region on the surface of a nonluminous celestial body (e.g., planet, moon, or small body) with distinct brightness (radiance) values or color, i.e., exhibiting observable/measurable brightness- or color-contrast relative to its surroundings. Albedo features were traditionally identified by doing spectrally ...

make the case more complicated to reach a general physical albedo model. 3.1. Albedo for simple geometry (Smooth Surfaces) In the first step, let us assume that all the surrounding area of theThe geometric albedo of an astronomical body is the ratio of its actual brightness at zero phase angle (i.e., as seen from the light source) to that of an idealized flat, fully reflecting, diffusively scattering disk with the same cross-section.. Diffuse scattering implies that radiation is reflected isotropically with no memory of the location of the incident light source.Context. Observations of the phase curves and secondary eclipses of extrasolar planets provide a window onto the composition and thermal structure of the planetary atmospheres. For example, the photometric observations of secondary eclipses lead to the measurement of the planetary geometric albedo, A<SUB>g</SUB>, which is an indicator of the presence of clouds in the atmosphere. <BR /> Aims ...Two versions of the Toon et al. (1992, Icarus 95, 24-53) Titan haze model were used to simulate the observed blue and yellow geometric albedo variations using a time-dependent haze production. Steady-state calculations were used to suggest that the range of production rate changes necessary to explain the observations was a factor of between 2 and 4. However, the blue and yellow geometric ...We present the results from polarimetry and spectroscopy of the PHA 214869 (2007 PA8). • The spectra reveal that 2007 PA8 is a Q-type. • Spectral parameters and meteorites comparison indicate a L chondrites analogy.. We derive a geometric albedo of 0.29 ± 0.08 and a diameter of 1.4 ± 0.2 km.. 2007 PA8 may be a member of the Gefion family recently ejected from the 5:2 resonance.To tackle these two problems, we propose a geometry-aware single-image human relighting framework that leverages single-image geometry reconstruction for joint deployment of traditional graphics rendering and neural rendering techniques. For the de-lighting, we explore the shortcomings of UNet architecture and propose a modified HRNet ...Geometric albedo predictions in the Kepler optical bandpass compared with published albedo measurements as a function of equilibrium temperature. Albedo predictions from the full-resolution Virga models are shown as circles, where the shading indicates the f sed value, going from 0.03 (light) to 6.0 (dark).

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Relationship between geometric albedo and visible/near infrared spectral type for near-Earth and main-belt asteroids. Also shown are the names of asteroids that have been explored by spacecraft. Data of other small bod-ies including Phobos, Deimos and 67P/Churyumov-Gerasimenko are also plotted in order to compare with asteroids. ...In astronomy, the geometric albedo of a celestial body is the ratio of its actual brightness as seen from the light source to that of an idealized flat, fully reflecting, diffusively scattering disk with the same cross-section.geometry, albedo, and illumination. Locally, we cannot tell if a surface is dark due to shading or albedo, as illustrated in Figure 1. To determine if a region is in shadow, we must compare the region to others that have the same material and orientation. For this reason, most research focuses on mod-Figure 1. What is in shadow?Geometric Albedo · Golden Diamond · Book Appointement · Custom Design Questionnaire. Search. "Close (esc)". View more. Geomeric Albedo. Filter (1). 11 products.El documento explica que el Albedo Geométrico suele ser más grande que el Albedo Bond, que a menudo solo refleja dos tercios de la luz reflectante del Albedo Geométrico. Wikipedia señala en este artículo sobre Bond Albedo; que Bond Albedo a veces puede ser mayor que Geometric Albedo, que aparentemente es el caso de Venus y Marte.The albedo of the project characterizes the ground in front of the installation, far from the system. It is used in the Transposition Model and affects the GlobInc value. The albedo for bifacial is a property of the ground just below your PV installation. A very important hypothesis of PVsyst is that the light re-emitted by a point of the ...There are multiple types and definitions of albedo. In the case of large asteroid surveys, the geometric albedo in the visible, p v, is determined on the basis of mid-infrared observations coupled with a thermal model and visible observations (Lebofsky et al., 1986). The geometric albedo is defined as the brightness ratio between the reflectedGeometry Dash Albedo is a simple demon level in the Geometry Dash series, created by Akinawoo/Akinari. It boasts an impressive 10-star rating and features 2 user coins. While it may be labeled as "simple," it remains a challenging and demanding level, and players are likely to encounter frequent deaths as they progress through it. ...Geometric albedo of Vesta based on 35 10-second images with a Celestron 11-inch telescope and SA100 transmission grating. Converting albedo to geometric albedo assumed a phase function, asteroid diameter, asteroid sun distance and asteroid Earth distance. The reference star was not in the FOV of the Vesta images, but images of 59 VIr were made ...planetary geometric albedo A g, which is an indicator of the presence of clouds in the atmosphere. Aims. In this work we aim to measure the A g in the optical domain of WASP-43b , a moderately ...Finally, we derived the geometric albedo of the smooth component of interplanetary dust, assuming big particles, and obtained a geometric albedo of 0.06+-0.01. The derived albedo is in accordance with collected dark micrometeorites and observed cometary dust particles. We concluded that chondritic particles are dominant near Earth space ...The urban canyon albedo (UCA) quantifies the ability of street canyons to reflect solar radiation back to the sky. The UCA is controlled by the solar reflectance of road and façades and the street geometry. This study investigates the variability of UCA in a typical residential area of London and its impact on outdoor and indoor microclimates. ….

El documento explica que el Albedo Geométrico suele ser más grande que el Albedo Bond, que a menudo solo refleja dos tercios de la luz reflectante del Albedo Geométrico. Wikipedia señala en este artículo sobre Bond Albedo; que Bond Albedo a veces puede ser mayor que Geometric Albedo, que aparentemente es el caso de Venus y Marte.Examples The Bond albedo is a value strictly between 0 and 1, as it includes all possible scattered light (but not radiation from the body itself). This is in contrast to other definitions of albedo such as the geometric albedo, which can be above 1.Sep 13, 2018 · It seems that the analysis of geometric albedo in the previous study by Hanel et al. 24 used some results from a study by Taylor 56, in which the geometric albedo was estimated to be ~0.28 over 0. ... A visual geometric albedo of 0.34±0.04 is remarkably high. As virtually no S-type asteroids have geometric albedos greater than 0.30 (Tedesco et al., 1989) , this high value suggests that Braille is a member of one of the rarer classes of stony asteroids: The A-type (olivine rich), the Q-type (olivine and pyroxene-rich), V-type (Vesta-like ...Geometric albedo predictions in the Kepler optical bandpass compared with published albedo measurements as a function of equilibrium temperature. Albedo predictions from the full-resolution Virga models are shown as circles, where the shading indicates the f sed value, going from 0.03 (light) to 6.0 (dark).The geometric albedo of Braille is unusually high (pv = 0.34), which is also consistent with its placement within the rarer classes of stony asteroids, and which suggests it has a relatively fresh, unweathered surface, perhaps due to a recent collision. KW - 9969 Braille.The selected geometric albedo is 0.18 [+ or -] 0.01 for the Johnson R and I system. Lane and Irvine (5) also review geometric albedo measurements of the Moon. The same procedure in Mallama and Schmude (15) is used in computing the geometric albedos .The selected geometric albedo is 0.18 [+ or -] 0.01 for the Johnson R and I system. Lane and Irvine (5) also review geometric albedo measurements of the Moon. The same procedure in Mallama and Schmude (15) is used in computing the geometric albedos .The geometric albedo, phase integral, and Bond albedo are fundamental optical characteristics, which can be used to better understand the surface properties of Enceladus (e.g., Buratti and Veverka, 1984; Verbiscer et al., 1990, Verbiscer et al., 2005, Verbiscer et al., 2006; Verbiscer and Helfenstein, 1998). The monochromatic Bond … Geometric albedo, Gökbilimde albedo (beyazlık), kendi ışığını üretemeyen gökcisimlerinin başka kaynaktan aldığı ışığı yansı tma gücü olarak tanımlanmaktadır. Bu kaynak, bizim sistemimizde …, The geometric albedo of a planetary body illuminated by the Sun is the ratio of its brightness observed at zero phase an-gle (i.e., measured in conditions of ideal solar opposition)1, infer geometric albedos for the planets with a detected occulta-tion, while being careful to account for the thermal contribution to the total occulted flux. For planets with dayside temperatures below 1500 K, they find that with increasing temperature the geometric albedo decreases because fewer condensates are cre-ated in the atmosphere., We report the detection of the secondary eclipse of the hot Jupiter HD 209458b in optical/visible light using the CHEOPS space telescope. Our measurement of 20.4 +/- 3.3 ppm translates into a geometric albedo of A_g = 0.096 +/- 0.016. The previously estimated dayside temperature of about 1500 K implies that our geometric albedo measurement consists predominantly of reflected starlight and is ..., $\begingroup$ The Bond albedo is a value strictly between 0 and 1, as it includes all possible scattered light (but not radiation from the body itself). $\endgroup$ – Constantthin. Feb 23, 2021 at 11:10 $\begingroup$ “The thermal radiant energy flux incident upon the surface of the earth may be separated into two components. Solar flux that ..., The bolometric Bond albedo is a fundamental parameter of planets and moons. Here, combined observations from the Cassini spacecraft and the Hubble Space Telescope are used to determine the bolometric Bond albedo of Enceladus. We provide the full-disk reflectance of Enceladus across all phase angles (0° -180°) from 150 nm to 5131 nm, a spectral range that accounts for nearly all incoming ... , Figure 1 represents the UV geometric albedo obtained at orbit 748 of Mars. Express at a phase angle of 22° and 1248 km distance. Phobos is extremely dark in the ..., The geometric albedo as a function of the scattering albedo for scattering in accordance with the isotropic and asymmetric phase functions are shown in Figures 2 and 3, respectively. As shown in Figure 2 , isotropic scattering leads to lower A g compared to that due to the Lambert and Rayleigh phase functions, for all ω., Then, by applying the model described in Ziar et al., 23 which bounds the geometrical and spectral features of albedo, maximum value of albedo was calculated for various levels above the water ..., The geometric albedo is the integrated reflectance of a planetary object in orthographic projection, measured where the angle between the illumination, object, and observer—the phase angle—is zero, relative to a Lambert disk (ideal diffuse surface) also observed at zero-phase angle (the normal albedo)., Albedo. Albedoul reprezintă mărimea care indică fracțiunea din energia luminoasă incidentă radiată în mod difuz de un corp. Albedo, în definiția sa curentă numit albedoul lui Bond, este o valoare cuprinsă între 0 și 1: un corp negru perfect, care ar absorbi toate lungimile de undă fără să reflecte niciuna, ar avea un albedo ..., The Albedo Color Property is highlighted. The Albedo Property controls the base color of the surface. A range of black to white albedo values. Specifying a single color for the Albedo value is sometimes useful, but it is far more common to assign a texture map for the Albedo Property. This should represent the colors of the surface of the object., 2 de mai. de 2021 ... In the case of large asteroid surveys, the geometric albedo in the visible, pv, is determined on the basis of mid-infrared observations coupled ..., The albedo of a celestial body is the fraction of light reflected by it. Modern astronomical facilities enable the measurement of geometric albedos from visible/optical secondary eclipses and the inference of the Bond albedo (spherical albedo measured over all wavelengths, weighted by the incident stellar flux) from infrared phase curves of transiting exoplanets. Determining the relationship ..., Asteroid - Orbit, Composition, Shape: The rotation periods and shapes of asteroids are determined primarily by monitoring their changing brightness on timescales of minutes to days. Short-period fluctuations in brightness caused by the rotation of an irregularly shaped asteroid or a spherical spotted asteroid (i.e., one with albedo differences) produce a light curve—a graph of brightness ..., Request PDF | Real-Time Geometry, Albedo, and Motion Reconstruction Using a Single RGB-D Camera | This article proposes a real-time method that uses a single-view RGB-D input (a depth sensor ..., Examples The Bond albedo is a value strictly between 0 and 1, as it includes all possible scattered light (but not radiation from the body itself). This is in contrast to other definitions of albedo such as the geometric albedo, which can be above 1., Bond albedos - total radiation reflected from an object compared to the total incident radiation from the Sun. Geometric albedos - the amount of radiation relative to that from a flat Lambertian surface which is an ideal reflector at all wavelengths. Study Astronomy Online at Swinburne University, The behavior is then extrapolated to phase angle of 0° using a polynomial fit, in order to provide grounds for comparison across meteorite groups (enabling to remove the contribution of shadows ..., Examples of how to use “geometric albedo” in a sentence from the Cambridge Dictionary Labs, The existence of shadows and reflections can lead to an inaccurate understanding of scene geometry, making precise factorization difficult. To this end, we present SIRe-IR, an implicit neural inverse rendering approach that uses non-linear mapping and regularized visibility estimation to decompose the scene into environment map, albedo, and ..., A visual geometric albedo of 0.34±0.04 is remarkably high. As virtually no S-type asteroids have geometric albedos greater than 0.30 (Tedesco et al., 1989) , this high value suggests that Braille is a member of one of the rarer classes of stony asteroids: The A-type (olivine rich), the Q-type (olivine and pyroxene-rich), V-type (Vesta-like ..., A visual geometric albedo of 0.34±0.04 is remarkably high. As virtually no S-type asteroids have geometric albedos greater than 0.30 (Tedesco et al., 1989) , this high value suggests that Braille is a member of one of the rarer classes of stony asteroids: The A-type (olivine rich), the Q-type (olivine and pyroxene-rich), V-type (Vesta-like ..., the surface roughness, local slopes and albedo variations globally and within permanently shaded craters near the poles. ... During the design phase, a nominal value of 0.26 (cf. the geometric albedo of 0.14 determined by (Robinson and Lucey 1997)) was used but a wide range of values was included in the simulations. \(T_ ..., With an average albedo of 0.90, clouds reflect about 90% of incoming solar radiation, a process called cloud albedo forcing. This results in a negative forcing or a cooling effect in cloudy areas ..., A geometric albedo of one doesn't mean all the light got reflected like it did for the bond albedo. So let's try to define the geometric albedo. There are two important points about the geometric albedo that make it differ from the bond albedo. For the bond albedo, we talked solely about the total amount of incident light and the total amount ..., The geometric albedo of Braille is unusually high (pv = 0.34), which is also consistent with its placement within the rarer classes of stony asteroids, and which suggests it has a relatively fresh, unweathered surface, perhaps due to a recent collision. KW - 9969 Braille., The geometric albedo of Braille is unusually high (p v =0.34), which is also consistent with its placement within the rarer classes of stony asteroids, and which suggests it has a relatively fresh, unweathered surface, perhaps due to a recent collision. Introduction., Real-Time Geometry, Albedo, and Motion Reconstruction Using a Single RGB-D Camera This article proposes a real-time method that uses a single-view RGB-D input (a depth sensor integrated with a color camera) to simultaneously reconstruct a casual scene with a detailed geometry model, surface albedo, per-frame non-rigid motion, and per-..., The geometric albedo is defined as the amount of radiation relative to that from a flat Lambertian surface which is an ideal reflector at all wavelengths. The bond albedo is the total radiation reflected from an object compared to the total incident radiation from the Sun., Albedo (/ælˈbiːdoʊ/), or reflection coefficient, derived from Latin albedo "whiteness" (or reflected sunlight) in turn from albus "white", is the diffuse reflectivity or reflecting power of a surface. It is the ratio of reflected radiation from the surface to incident radiation upon it. Its dimensionless nature lets it be expressed as a percentage and is measured on a scale …, a very bright surface with a geometric albedo of pV = 0:96 +0 :09 0 :04 and a density of = 2:5 0:05 g cm 3, indicating a high rock fraction. The high albedo can be caused by a collapsed nitrogen, methane or argon atmosphere that is presently condensed on the surface, and sublimated only near perihelion. The high rock, Reflected spectra (top panel) and Geometric albedo (bottom panel) for the Earth-like exoplanets orbiting around the Sun-like stars at a resolution of 300. The blue plot is for the clear sky while ...