J
Joseph L. Hora
Researcher at Smithsonian Institution
Publications - 439
Citations - 27846
Joseph L. Hora is an academic researcher from Smithsonian Institution. The author has contributed to research in topics: Spitzer Space Telescope & Stars. The author has an hindex of 74, co-authored 436 publications receiving 25913 citations. Previous affiliations of Joseph L. Hora include CFA Institute & Max Planck Society.
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Journal ArticleDOI
Physical properties of near-earth asteroid 2011 md
Michael Mommert,Davide Farnocchia,Joseph L. Hora,Steven R. Chesley,David E. Trilling,Paul W. Chodas,Michael Mueller,Alan W. Harris,Howard A. Smith,Giovanni G. Fazio +9 more
TL;DR: In this article, the authors used an asteroid thermophysical model and a model of nongravitational forces acting upon the object to constrain the physical properties of 2011 MD, based on the measured flux density and available astrometry data.
Journal ArticleDOI
Spitzer Observations of Interstellar Object 1I/`Oumuamua
David E. Trilling,David E. Trilling,Michael Mommert,Michael Mommert,Joseph L. Hora,Davide Farnocchia,Paul W. Chodas,Jon D. Giorgini,Howard A. Smith,Sean Carey,Carey M. Lisse,Michael W. Werner,Andrew McNeill,Steven R. Chesley,Joshua P. Emery,Giovanni G. Fazio,Yanga R. Fernandez,Alan W. Harris,Massimo Marengo,Michael Mueller,Michael Mueller,Alissa Roegge,Nathan Smith,Harold A. Weaver,Karen J. Meech,Marco Micheli +25 more
TL;DR: In this paper, the authors reported on observations of Oumuamua made with the Spitzer Space Telescope on 2017 November 21-22 (UT) at 4.5 micron (IRAC channel 2) and placed an upper limit on the flux of 0.3 uJy (3sigma).
Journal ArticleDOI
Spitzer/IRAC Observations of the Variability of Sgr A* and the Object G2 at 4.5 microns
Joseph L. Hora,G. Witzel,M. L. N. Ashby,E. E. Becklin,Sean Carey,Giovanni G. Fazio,Andrea M. Ghez,J. Ingalls,Leo Meyer,Mark Morris,Howard A. Smith,Steven P. Willner +11 more
TL;DR: In this paper, the authors presented the first detection from the Spitzer Space Telescope of 4.5 micron variability from Sgr A*, the emitting source associated with the Milky Way's central black hole.
Journal ArticleDOI
A spitzer/irac measure of the zodiacal light
Jessica Krick,William J. Glaccum,Sean Carey,Patrick J. Lowrance,Jason Surace,James G. Ingalls,Joseph L. Hora,William T. Reach +7 more
TL;DR: In this article, the dominant non-instrumental background source for space-based infrared observatories is the zodiacal light (ZL) and the authors present Spitzer Infrared Array Camera (IRAC) measurements of the ZL at 3.6, 4.5, 5.8, and 8.0 μm.
Journal ArticleDOI
Spitzer, very large telescope, and very large array observations of the galactic luminous blue variable candidate hd 168625
TL;DR: In this paper, mid-IR and radio observations of the Galactic luminous blue variables (LBVs) candidate HD 168625 and its associated nebula were performed using the Infrared Spectrograph on board the Spitzer Space Telescope.