Results 31 to 40 of about 346 (266)

Influence of scintillation on quality of ozone monitoring by GOMOS [PDF]

Atmospheric Chemistry and Physics, 2009
Stellar light passing through the Earth atmosphere is affected by refractive effects, which should be taken into account in retrievals from stellar occultation measurements.
F. Vanhellemont, A. Hauchecorne, D. Fussen, J.-L. Bertaux, J. Tamminen, F. Dalaudier, E. Kyrölä, V. Kan, V. F. Sofieva   +8 more
doaj  

Fluctuations of the Earth’s Rotation by Stellar Occultations [PDF]

Symposium - International Astronomical Union, 1990
Observations of lunar occultations made between 1800 and 1955 are analyzed in order to determine the fluctuations of the Earth's rotation before the International Atomic Time was established. The reduction is made on the basis of the DE200/LE200 ephemeris and the FK5 system.
C. Jordi, G. Rossello
openaire   +1 more source

Pluto-Charon Stellar Occultation Candidates: 1996-1999 [PDF]

The Astronomical Journal, 1996
We have carried out a search to identify stars that might be occulted by Pluto or Charon during the period 1990-1995 and part of 1996. This search was made with an unfiltered CCD camera operated in the strip scanning mode, and it reaches an R magnitude of approximately 17.5-about 1.5 mag fainter than previous searches. Circumstances for each of the 162
S. W. McDonald, J. L. Elliot
openaire   +2 more sources

Chiron stellar occultation candidates: 1993-1996

The Astronomical Journal, 1994
A photographic search was conducted for stars that may be occulted by the unusual solar system object (2060) Chiron during the period from fall 1993 through summer 1996. 44 candidates were identified to a limiting V magnitude of 16, and for which the minimum appulse separation with Chiron is predicted to be less than 2.5 arcsec.
S. J. Bus, L. H. Wasserman, J. L. Elliot
openaire   +1 more source

PLUTO’s ATMOSPHERE FROM STELLAR OCCULTATIONS IN 2012 AND 2013 [PDF]

The Astrophysical Journal, 2015
We analyze two multi-chord stellar occultations by Pluto observed on July 18th, 2012 and May 4th, 2013, and monitored respectively from five and six sites. They provide a total of fifteen light-curves, twelve of them being used for a simultaneous fit that uses a unique temperature profile, assuming a clear (no-haze) and pure N_2 atmosphere, but ...
Dias-Oliveira, A., Sicardy, B., Lellouch, E., Vieira-Martins, R., Assafin, M., Camargo, J., Braga-Ribas, F., Gomes-Júnior, A., Benedetti-Rossi, G., Colas, F., Decock, A., Doressoundiram, A., Dumas, C., Emilio, M., Fabrega Polleri, J., Gil-Hutton, R., Gillon, M., Girard, J., Hau, G., Ivanov, V., Jehin, E., Lecacheux, J., Leiva, R., Lopez-Sisterna, C., Mancini, L., Manfroid, J., Maury, A., Meza, E., Morales, N., Nagy, L., Opitom, C., Ortiz, J., Pollock, J., Roques, F., Snodgrass, C., Soulier, J., Thirouin, A., Vanzi, L., Widemann, T., Reichart, D., Lacluyze, A., Haislip, J., Ivarsen, K., Dominik, M., Jørgensen, U., Skottfelt, J.   +45 more
openaire   +9 more sources

Correlation of the differential expression of PIK3R1 and its spliced variant, p55α, in pan‐cancer

Molecular Oncology, EarlyView.
PIK3R1 undergoes alternative splicing to generate the isoforms, p85α and p55α. By combining large patient datasets with laboratory experiments, we show that PIK3R1 spliced variants shape cancer behavior. While tumors lose the protective p85α isoform, p55α is overexpressed, changes linked to poorer survival and more pronounced in African American ...
Ishita Gupta, Yang Song, Madeleine Ndahayo, Anirudh Saxena, Theresa Guo, Dylan Z. Kelley, Jessica Gore, Andrew Hennigan, Alexa Anderson, John C. Papadimitriou, Daria A. Gaykalova   +10 more
wiley   +1 more source

Oxygen and Air Density Retrieval Method for Single-Band Stellar Occultation Measurement

Remote Sensing
The stellar occultation technique is capable of atmospheric trace gas detection using the molecule absorption characteristics of the stellar spectra. In this paper, the non-iterative and iterative retrieval methods for oxygen and air density detection by
Zheng Li, Xiaocheng Wu, Cui Tu, Junfeng Yang, Xiong Hu, Zhaoai Yan   +5 more
doaj   +1 more source

The colibri telescope array for KBO detection through serendipitous stellar occultations: A technical description

Frontiers in Astronomy and Space Sciences, 2022
We present the technical design, construction and testing of the Colibri telescope array at Elginfield Observatory near London, Ontario, Canada. Three 50-cm telescopes are arranged in a triangular array and are separated by 110–160 m.
Michael J. Mazur, Stanimir Metchev, Stanimir Metchev, Rachel A. Brown, Rachel A. Brown, Ridhee Gupta, Richard Bloch, Tristan Mills, Emily Pass   +8 more
doaj   +1 more source

Stellar Multiplicity Discovery by Lunar Occultations [PDF]

International Astronomical Union Colloquium, 1992
AbstractThe primary result of lunar occultation studies of multiple star systems is the discovery of new systems. Its use as a method of multiplicity discovery has been productive, although incidental to timing observations made by amateurs and professionals for 360 years.
openaire   +1 more source

Pluto’s ephemeris from ground-based stellar occultations (1988–2016) [PDF]

Astronomy & Astrophysics, 2019
Context. From 1988 to 2016, several stellar occultations have been observed to characterise Pluto’s atmosphere and its evolution. From each stellar occultation, an accurate astrometric position of Pluto at the observation epoch is derived. These positions mainly depend on the position of the occulted star and the precision of the timing. Aims.
J. Desmars, E. Meza, B. Sicardy, M. Assafin, J. I. B. Camargo, F. Braga-Ribas, G. Benedetti-Rossi, A. Dias-Oliveira, B. E. Morgado, A. R. Gomes-Júnior, R. Vieira-Martins, R. Behrend, J. L. Ortiz, R. Duffárd, N. Morales, P. Santos-Sanz   +15 more
openaire   +6 more sources