Results 101 to 110 of about 11,793 (207)

Astrometry of Galactic Star Forming Region Sharpless 269 with VERA : Parallax Measurements and Constraint on Outer Rotation Curve

, 2007
We have performed high-precision astrometry of H2O maser sources in Galactic star forming region Sharpless 269 (S269) with VERA. We have successfully detected a trigonometric parallax of 189+/-8 micro-arcsec, corresponding to the source distance of 5.28 +
Bushimata, Takeshi, Choi, Yoon Kyung, Hirota, Tomoya, Honma, Mareki, Imai, Hiroshi, Iwadate, Kenzaburo, Jike, Takaaki, Kameya, Osamu, Kamohara, Ryuichi, Kan-ya, Yukitoshi, Kawaguchi, Noriyuki, Kijima, Masachika, Kobayashi, Hideyuki, Kuji, Seisuke, Kurayama, Tomoharu, Manabe, Seiji, Miyaji, Takeshi, Nagayama, Takumi, Nakagawa, Akiharu, Oh, Chung Sik, Omodaka, Toshihiro, Oyama, Tomoaki, Sakai, Satoshi, Sasao, Tetsuo, Sato, Katsuhisa, Shibata, Katsunori M., Shintani, Motonobu, Suda, Hiroshi, Tamura, Yoshiaki, Tsushima, Miyuki, Yamashita, Kazuyoshi   +30 more
core   +2 more sources

Radio astrometry from the Moon [PDF]

An array of three radio telescopes on the Moon, separated by 100-1000 km, could measure the positions of compact radio sources 50-100 times more accurately than can be done on Earth.
Linfield, R. P.
core   +1 more source

A Geodetic and Astrometric VLBI Experiment at 22/43/88/132 GHz

The Astronomical Journal
Extending geodetic and astrometric Very Long Baseline Interferometry (VLBI) observations from traditional centimeter wavebands to millimeter wavebands offers numerous scientific potentials and benefits. However, it was considered quite challenging due to
Shuangjing Xu, Taehyun Jung, Bo Zhang, Ming Hui Xu, Do-Young Byun, Xuan He, Nobuyuki Sakai, Oleg Titov, Fengchun Shu, Hyo-Ryoung Kim, Jungho Cho, Sung-Moon Yoo, Byung-Kyu Choi, Woo Kyoung Lee, Yan Sun, Xiaofeng Mai, Guangli Wang   +16 more
doaj   +1 more source

VLA+PT Astrometry of 46 Radio Stars

, 2006
We have used the Very Large Array (VLA), linked with the Pie Town Very Long Baseline Array antenna, to determine astrometric positions of 46 radio stars in the International Celestial Reference Frame (ICRF). Positions were obtained in the ICRF directly through phase referencing of the stars to nearby ICRF quasars whose positions are accurate at the 0 ...
Boboltz, D. A., Fey, A. L., Puatua, W. K., Zacharias, N., Claussen, M. J., Johnston, K. J., Gaume, R. A.   +6 more
openaire   +2 more sources

Measuring Titan’s rapid orbital expansion combining Cassini radio science normal points and astrometry

Astronomy & Astrophysics
Recent analyses of Titan’s orbital migration have yielded conflicting results regarding Saturn’s tidal dissipation (Q) at Titan’s frequency. While some studies reported a low Q consistent with resonance locking using independent radio science and ...
Magnanini Andrea, Lainey Valery, Gomez Casajus Luis, Zannoni Marco, Tortora Paolo   +4 more
doaj   +1 more source

Modern Observational Techniques for Comets [PDF]

Techniques are discussed in the following areas: astrometry, photometry, infrared observations, radio observations, spectroscopy, imaging of coma and tail, image processing of observation.
Brandt, J. C., Donn, B., Greenberg, J. M., Rahe, J.   +3 more
core   +1 more source

Radio Interferometric Planet Search II: Constraints on sub-Jupiter-Mass Companions to GJ 896A

, 2011
We present results from the Radio Interferometric Planet (RIPL) search for compan- ions to the nearby star GJ 896A. We present 11 observations over 4.9 years.
Adam Fries, Alberto Bolatto, Bennett, Benz, Borucki, Boss, Bower, Bower, Butler, Endl, Eric B. Ford, Fomalont, Forbrich, Gagne, Geoffrey C. Bower, Gould, Ida, Jackson, Johnson, Karol Sanchez, Kraus, Laughlin, Lestrade, Loinard, Mason, Muterspaugh, Pallavicini, Paul Kalas, Phoebe Sanderbeck, Sandstrom, Torres, Vincent Viscomi, Xu   +32 more
core   +1 more source

Radio Astrometry towards the Nearby Universe with the SKA

, 2016
16 pages, 13 figures, Chapter in the SKA Japan Science Book, provided by SKA Japan Astrometry Science Working ...
Imai, Hiroshi, Burns, Ross A., Yamada, Yoshiyuki, Goda, Naoteru, Yano, Tahei, Orosz, Gabor, Niinuma, Kotaro, Bekki, Kenji   +7 more
openaire   +2 more sources

A Radio Flaring, Chromospherically Inactive K Dwarf

The Astrophysical Journal
We report on an unusual radio source (J180526−292953), initially identified as a steep spectrum, polarized point source toward the Galactic bulge and found to coincide with the nearby K dwarf HD 317101A.
Dale A. Frail, Scott D. Hyman, Michele L. Silverstein, Emil Polisensky, Evangelia Tremou, Simona Giacintucci, Hodari-Sadiki Hubbard-James, Jacinda Byam, Steve B. Howell, Robert F. Wilson, Matthew Lastovka, Tracy E. Clarke, Namir E. Kassim   +12 more
doaj   +1 more source

Optical-uv spectrum and proper motion of the middle-aged pulsar b1055-52

, 2010
PSRB1055-52 is a middle-aged (~535 kyr) radio, X-ray, and gamma-ray pulsar showing X-ray thermal emission from the neutron star (NS) surface. A candidate optical counterpart to PSRB1055-52 was proposed by Mignani and coworkers based on Hubble Space ...
Abdo, Apellánez, Becker, Bignami, Brinkmann, Brisken, Caraveo, Caraveo, Cordes, De Luca, de Zeeuw, G. G. Pavlov, Greiveldinger, Guillemot, Høg, Kaplan, Kargaltsev, Kargaltsev, Lasker, Lattanzi, Manchester, Manchester, Mignani, Mignani, Monet, Newton, Nota, O. Kargaltsev, Pavlov, Pavlov, Pavlov, Pavlov, Perryman, Predehl, R. P. Mignani, Roeser, Seaton, Shibanov, Skrutskie, Thompson, Vande Putte, Vaughan, Wang, Zacharias, Zacharias, Zavlin   +45 more
core   +1 more source