搜索结果: 1-10 共查到“天文学 comets”相关记录10条 . 查询时间(0.076 秒)
Astronomers discover comets may be more fragile than previously believed
Astronomers comets more fragile previously believed
2017/7/24
Dr. Maria Womack from the University of South Florida is lead investigator of a study on the Centaur “Echeclus,” which is a peculiar minor planet in our solar system.“Echeclus is rare because it behav...
Caltech Chemical Engineer Explains Oxygen Mystery on Comets
Caltech Chemical Engineer Oxygen Mystery Comets
2017/7/20
A Caltech chemical engineer who normally develops new ways to fabricate microprocessors in computers has figured out how to explain a nagging mystery in space—why comets expel oxygen gas, the same gas...
Millimeter-wave molecular mapping of comets Hyakutake and Hale -Bopp
Comet The wu comet Millimeter wave instrument
2014/12/9
The inner solar system passes of the bright comets C/1995 O1 Hale-Bopp and C/1996 B2 Hyakutake, coupled with modern, sensitive millimeter-wave instrumentation provided an opportunity to make unprecede...
Ensemble Properties of Comets in the Sloan Digital Sky Survey
COMETS PHOTOMETRY COMETS COMA
2012/2/23
We present the ensemble properties of 31 comets (27 resolved and 4 unresolved) observed by the Sloan Digital Sky Survey (SDSS). This sample of comets represents about 1 comet per 10 million SDSS photo...
Swift UVOT Grism Spectroscopy of Comets: A First Application to C/2007 N3 (Lulin)
Comets Individual Methods Data Analysis –Techniques Image Spectroscopy – Ultraviolet planetary systems
2010/11/11
We observed comet C/2007 N3 (Lulin) twice on UT 28 January 2009, using the UV grism of the Ultraviolet and Optical Telescope (UVOT) on board the Swift Gamma Ray Burst space observatory. Grism spectros...
A Unified Theory for the Effects of Stellar Perturbations and Galactic Tides on Oort Cloud Comets
Earth and Planetary Astrophysics (astro-ph.EP)
2010/12/23
We examine the effects of passing field stars on the angular momentum of a nearly radial orbit of an Oort cloud comet bound to the Sun. We derive the probability density function (PDF) of the change i...
Size and Fraction of Active Surface Area of Some Jupiter Family Comets：Implications with Respect to their Physical Evolution
Active Surface Area Physical Evolution Jupiter Family Comets
2009/6/5
Size and Fraction of Active Surface Area of Some Jupiter Family Comets：Implications with Respect to their Physical Evolution。
Busca 97 and 98 - Uruguayan Search of Satellites, Asteroids and Comets
Asteroids Comets Satellites
2009/6/5
Busca 97 and 98 - Uruguayan Search of Satellites, Asteroids and Comets。
RESULTS OF THE HALLEY AND GIACOBINI-ZINNER COMETS OBSERVATIONS AT THE BELGRADE OBSERVATORY
GIACOBINI-ZINNER COMETS HALLEY BELGRADE OBSERVATORY
2009/4/16
RESULTS OF THE HALLEY AND GIACOBINI-ZINNER COMETS OBSERVATIONS AT THE BELGRADE OBSERVATORY。
V.Protich-Benishek and Vl.Benishek：CCD ASTROMETRIC OBSERVATIONS OF COMETS AT THE BELGRADE OBSERVATORY DURING 1998-2000 (I)
V.Protich-Benishek CCD ASTROMETRIC Vl.Benishek COMETS
2009/3/18
143 precise astrometric positions of seven comets were obtained
with the CCD equipped Askania astrograph (13.5/160) of Belgrade Astronomical
Observatory. The SBIG ST-8(1530 × 1020 pixel array) camer...