scholarly journals The Sizes and Albedos of Centaurs 2014 YY49 and 2013 NL24 from Stellar Occultation Measurements by RECON

2021 ◽  
Vol 2 (1) ◽  
pp. 22
Author(s):  
Ryder H. Strauss ◽  
Rodrigo Leiva ◽  
John M. Keller ◽  
Elizabeth Wilde ◽  
Marc W. Buie ◽  
...  
Keyword(s):  
Stellar Occultation

An investigation of Pluto’s troposphere using stellar occultation light curves and an atmospheric radiative–conductive–convective model

Icarus ◽  
2011 ◽  
Vol 214 (2) ◽  
pp. 685-700 ◽  
Author(s):  
Angela M. Zalucha ◽  
Xun Zhu ◽  
Amanda A.S. Gulbis ◽  
Darrell F. Strobel ◽  
J.L. Elliot
Keyword(s):  
Light Curves ◽  
Stellar Occultation ◽  
Convective Model

Ultraviolet stellar occultation measurement of the H 2 and O 2 densities near 100 km in the Earth's atmosphere

1976 ◽  
Vol 3 (10) ◽  
pp. 607-610 ◽  
Author(s):  
S. K. Atreya ◽  
T. M. Donahue ◽  
W. E. Sharp ◽  
B. Wasser ◽  
J. F. Drake ◽  
...  
Keyword(s):  
Earth’S Atmosphere ◽  
Stellar Occultation ◽  
Earth's Atmosphere

scholarly journals The 2017 May 20th stellar occultation by the elongated centaur (95626) 2002 GZ32

2020 ◽  
Author(s):  
P Santos-Sanz ◽  
J L Ortiz ◽  
B Sicardy ◽  
G Benedetti-Rossi ◽  
N Morales ◽  
...  
Keyword(s):  
Rotation Period ◽  
Hydrostatic Equilibrium ◽  
Homogeneous Body ◽  
Ellipsoidal Shape ◽  
Stellar Occultation ◽  
Path Prediction ◽  
Error Bars ◽  
Geometric Albedo ◽  
Radiometric Technique ◽  
Broad Region

Abstract We predicted a stellar occultation of the bright star Gaia DR1 4332852996360346368 (UCAC4 385-75921) (mV= 14.0 mag) by the centaur 2002 GZ32 for 2017 May 20th. Our latest shadow path prediction was favourable to a large region in Europe. Observations were arranged in a broad region inside the nominal shadow path. Series of images were obtained with 29 telescopes throughout Europe and from six of them (five in Spain and one in Greece) we detected the occultation. This is the fourth centaur, besides Chariklo, Chiron and Bienor, for which a multi-chord stellar occultation is reported. By means of an elliptical fit to the occultation chords we obtained the limb of 2002 GZ32 during the occultation, resulting in an ellipse with axes of 305 ± 17 km × 146 ± 8 km. From this limb, thanks to a rotational light curve obtained shortly after the occultation, we derived the geometric albedo of 2002 GZ32 (pV = 0.043 ± 0.007) and a 3-D ellipsoidal shape with axes 366 km × 306 km × 120 km. This shape is not fully consistent with a homogeneous body in hydrostatic equilibrium for the known rotation period of 2002 GZ32. The size (albedo) obtained from the occultation is respectively smaller (greater) than that derived from the radiometric technique but compatible within error bars. No rings or debris around 2002 GZ32 were detected from the occultation, but narrow and thin rings cannot be discarded.

The May 26, 2020 multi-chord stellar occultation by the trans-Neptunian object (119951) 2002 KX14 

2021 ◽  
Author(s):  
Mike Kretlow ◽  
José Luis Ortiz ◽  
Bruno Sicardy ◽  
Josselin Desmars ◽  
Pablo Santos-Sanz ◽  
...  
Keyword(s):  
Stellar Occultation

scholarly journals Ozone profile smoothness as a priori information in the inversion of limb measurements

2004 ◽  
Vol 22 (10) ◽  
pp. 3411-3420 ◽  
Author(s):  
V. F. Sofieva ◽  
J. Tamminen ◽  
H. Haario ◽  
E. Kyrölä ◽  
M. Lehtinen
Keyword(s):  
A Priori ◽  
Optimal Estimation ◽  
Maximum A Posteriori ◽  
A Posteriori ◽  
A Priori Information ◽  
Ozone Profile ◽  
Stellar Occultation ◽  
Atmospheric Profiles ◽  
Priori Information ◽  
Typical Measurement

Abstract. In this work we discuss inclusion of a priori information about the smoothness of atmospheric profiles in inversion algorithms. The smoothness requirement can be formulated in the form of Tikhonov-type regularization, where the smoothness of atmospheric profiles is considered as a constraint or in the form of Bayesian optimal estimation (maximum a posteriori method, MAP), where the smoothness of profiles can be included as a priori information. We develop further two recently proposed retrieval methods. One of them - Tikhonov-type regularization according to the target resolution - develops the classical Tikhonov regularization. The second method - maximum a posteriori method with smoothness a priori - effectively combines the ideas of the classical MAP method and Tikhonov-type regularization. We discuss a grid-independent formulation for the proposed inversion methods, thus isolating the choice of calculation grid from the question of how strong the smoothing should be. The discussed approaches are applied to the problem of ozone profile retrieval from stellar occultation measurements by the GOMOS instrument on board the Envisat satellite. Realistic simulations for the typical measurement conditions with smoothness a priori information created from 10-years analysis of ozone sounding at Sodankylä and analysis of the total retrieval error illustrate the advantages of the proposed methods. The proposed methods are equally applicable to other profile retrieval problems from remote sensing measurements.

Stellar Occultation Observations of Neptune's Rings: 1984-1988

Icarus ◽  
1995 ◽  
Vol 113 (2) ◽  
pp. 295-330 ◽  
Author(s):  
Philip D. Nicholson ◽  
Ignacio Mosqueira ◽  
Keith Matthews
Keyword(s):  
Stellar Occultation

scholarly journals Probing the Hill Sphere of (486958) 2014 MU69: HST FGS Observations during the 2017 July 17 Stellar Occultation

2018 ◽  
Vol 156 (2) ◽  
pp. 72 ◽  
Author(s):  
Joshua A. Kammer ◽  
Tracy M. Becker ◽  
Kurt D. Retherford ◽  
S. Alan Stern ◽  
Catherine B. Olkin ◽  
...  
Keyword(s):  
Stellar Occultation ◽  
The Hill

Envisat/GOMOS Stellar Occultation: Inversion Schemes and First Analyses of Real Data

2004 ◽  
pp. 275-287
Author(s):  
E. Kyrölä ◽  
J. Tamminen ◽  
G. W. Leppelmeier ◽  
V. F. Sofieva ◽  
S. Hassinen ◽  
...  
Keyword(s):  
Real Data ◽  
Stellar Occultation

Preliminary application of stellar occultation in the near-space

2019 ◽  
Vol 48 (9) ◽  
pp. 909001
Author(s):  
孙明晨 Sun Mingchen ◽  
涂 翠 Tu Cui ◽  
胡 雄 Hu Xiong ◽  
宫晓艳 Gong Xiaoyan ◽  
郭文杰 Guo Wenjie
Keyword(s):  
Near Space ◽  
Stellar Occultation ◽  
Preliminary Application
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