Results 101 to 110 of about 10,210 (220)

High-precision Astrometric Positioning of Near-Earth Asteroids—via the Close Approach Method

The Astronomical Journal
High-precision astrometry of near-Earth asteroids (NEAs) is critical for orbit determination and impact risk assessment, yet it remains challenging due to their rapid apparent motion and short-range systematic errors.
ZhenJun Zhang, JianCheng Wang, YiGong Zhang, Jie Su, XiangMing Cheng   +4 more
doaj   +1 more source

Eccentric and cool: A high-spectral-resolution view of 51 Eri b with VLT/HiRISE★

Astronomy & Astrophysics
Discovered almost ten years ago, the giant planet 51 Eridani b is one of the least separated (≈0.2″) and faintest (J ≈ 19.74 mag) directly imaged exoplanets known to date.
Denis A., Vigan A., Chauvin G., Lacquement A., Beust H., Ravet M., Costes J., Radcliffe A., Martos S., Balmer W., Stolker T., Palma-Bifani P., Rajpoot B., Simonnin A., Petrus S., Forveille T., Janson M., Reiners A., Godoy N., Cont D., Nortmann L., Hoy K., Zurlo A., Anwand-Heerwart H., Charles Y., Costille A., El Morsy M., Garcia J., Houllé M., Lopez M., Murray G., Muslimov E., Otten G. P. P. L., Paufique J., Phillips M., Seemann U., Viret A., Zins G.   +37 more
doaj   +1 more source

High Resolution Near-Infrared Imaging Observations of the Galactic Centre [PDF]

, 2004
Ziel der vorliegenden Doktorarbeit war es, neue Erkenntnisse über die Struktur, Zusammensetzung und Dynamik des zentralen Sternhaufens unserer Milchstraße zu gewinnen.
Schödel, R., Schödel, Rainer, Schoedel, Rainer   +2 more
core  

Gaia20fnr: A binary-lens microlensing event with full orbital motion revealed by four space telescopes

Astronomy & Astrophysics
The microlensing event Gaia20fnr is a long-duration, non-caustic-crossing binary-lens event located at a high Galactic latitude. Triggered by a photometric rise detected by the Gaia space mission, the event was followed up with observations from multiple
Wicker M., Wyrzykowski Ł., Hundertmark M., Rybicki K. A., Zieliński P., Stonkutė E., Gromadzki M., Maskoliūnas M., Ihanec N., Ratajczak M., Bachelet E., Kruszyńska K., Dominik M., Buckley D. A. H., Gezer I., Chené A.-N., Mikołajczyk P., Kotysz K., Majumdar J., Pakštiene E., Zdanavičius J., Čepas V., Jonauskaitė U., Bozza V., Cassan A., Figuera Jaimes R., Rabus M., Rota P., Street R. A., Tsapras Y., Wambsganss J., Awiphan S., Brincat S. M., Budzik Z., Davidson J. W., Dymock R., Galdies C., Godunova V., Hambsch F.-J., Jablonska M., Kowalik P., Kvernadze T., Larma M., Makowska M., Markus Y., Merc J., Michniewicz O., Motylinski M., Popowicz A., Radziwonowicz M., Reichart D., Romanov F. D., Simon A. O., Trzcionkowski P., Wróbel E., Zejmo M., Zola S.   +56 more
doaj   +1 more source

Dynamical masses of young stellar objects with the VLBA: DYNAMO-VLBA

Astronomy & Astrophysics
We present results from a multi-epoch Very Long Baseline Array (VLBA) survey conducted as part of the DYNAMO–VLBA project, aimed at measuring the dynamical masses of young stellar systems in the Orion complex.
Dzib Sergio A., Ordóñez-Toro Jazmín, Loinard Laurent, Kounkel Marina, Ortiz-León Gisela N., Galli Phillip A. B., Rodríguez Luis F., Mioduszewski Amy J., Masqué Josep M., O’Kelly Eoin, Forbrich Jan, Moo-Herrera Karla   +11 more
doaj   +1 more source

Global Astrometry With The Space Interferometry Mission

, 2005
In this paper we will discuss the prospects for global astrometric measurements with the Space Interferometry Mission (SIM). SIM will perform four microarcsec astrometric measurements on objects as dim as 20th magnitude using optical interferometric ...
A. Boden, S. Unwin, M. Shao
core  

A joint JWST and HST view of Omega Centauri: Multiple stellar populations and their kinematics

Astronomy & Astrophysics
We combine F115W and F277W images collected with the Near Infrared Camera of the James Webb Space Telescope with multiband, multi-epoch Hubble Space Telescope observations of ω Centauri to investigate its multiple stellar populations and internal ...
Ziliotto T., Milone A. P., Cordoni G., Marino A. F., Legnardi M. V., Dondoglio E., Bortolan E., Muratore F.   +7 more
doaj   +1 more source

Micro-Arcsecond Radio Astrometry

, 2014
Astrometry provides the foundation for astrophysics. Accurate positions are required for the association of sources detected at different times or wavelengths, and distances are essential to estimate the size, luminosity, mass, and ages of most objects ...
M J Reid, M Honma
core  

True masses using radial velocity data with HIPPARCOS and Gaia astrometry

Astronomy & Astrophysics
Context. Long-period companions are detected and characterised thanks to long-baseline radial velocity surveys. By combining Doppler time series with astrometry, and in particular with the proper motion anomalies technique, it is possible to put strong ...
Piccinini G., Petralia A., Sozzetti A., Benatti S., Gandolfi D., Micela G.   +5 more
doaj   +1 more source

Fundamentals of Astrometry

, 2004
2004 text detailing the fundamentals of astrometry at milli- and micro-arcsecond ...
Kovalevsky, Jean, Kovalevsky, J., Seidelmann, P Kenneth, Seidelmann, P.K.   +3 more
core