... The J, H and K bands are characterized by a bright background, such a background is mainly due to the emission of atmospheric lines and of thermal radiation. ... If the source cover a large fraction of the slit, spectra off-source must be observed to adequately sample the sky background. ... The on chip integration time (time spent in each position of the slit) must not exceed 40 seconds in J and H bands and 60 seconds in K band. ... We suggest a sequence of 10 for each elementary integration time. ...

Еще в разделе: (Показать все результаты (>8934) - www.arcetri.astro.it/ )

... We will consider the rms, (K), for observations with a receiver of system temperature, T , frequency resolution, per polarization, and total integration time per observing cycle, . ... For ``in-band'' frequency switching, the line under investigation is always in the observing band. ... Position Switching or ``Out-of-Band'' Frequency Switching: Here the line is only observed for one half of the time, with noise being present all of the time. ...

Еще в разделе: (Показать все результаты (>5531) - www.naic.edu/ )

• Example Observing Projects
• CIMA Auto-Observing
• Spectral Line Observing with ALFA

Observation Strategies . For broad band filters the sky background will limit the detection of faint targets. ... See Table 6.3 on page 113 for sky level as function of ecliptic coordinates.) If these higher sky levels would severely impact the science data, observers should consider specifying the special requirement LOW-SKY on the Phase II proposal. ... Scattering of bright Earth light in the OTA can produce non-uniformities in the background which may hamper analysis of faint target images. ...

Еще в разделе: (Показать все результаты (>18233) - www.stsci.edu/ )

• Thermal/Sky Backgrounds GPI Data Pipeline 1.0 documentation
• COS Observing Strategies
• HDF-S Observing Strategy

... Science Activities > PhD Thesis Topics offered by ESO Faculty Members > Thesis Topic: Foreground emission and Cosmic Microwave background intrinsic anisotropies . ... Since its discovery the Cosmic Microwave Radiation (CMB) has been one of the pillars of modern Cosmology. ... Further development of this work is the application of already tested algorithms to disentangle the foreground emission from the CMB maps and the determination of the CMB intrinsic emission. ... Return to list of thesis topics ...

Еще в разделе: (Показать все результаты (>23938) - www.eso.org/ )

• Observing list preparation
• ESO - Observing conditions: definitions
• ESO - Phase 2 Observing Preparation . for ESO telescopes

... You are here: start €Ё lbaops €Ё lbafeb2009 €Ё v255e . ... VLBI Schedule . ... lbaops:lbafeb2009:v255e . v255e Setup v255e.5cm-icrf: . ... IFP#1-LO 6300 - 6316 MHz USB LCP . ... IFP#1-HI 6316 - 6332 MHz USB LCP . ... IFP#2-LO 6642 - 6658 MHz USB LCP . ... Ftp: ftp://ftp.atnf.csiro.au/pub/people/vlbi/v255/v255e . ... The 4 x 16 MHz bandpass setup will require feeding two separate LOs into IFP#1 and #2 on the DAS /frequency translator and splitting the LCP signal so that is feed into both sides. ...

Еще в разделе: (Показать все результаты (>31197) - www.atnf.csiro.au/ )

• lbaops:lbadec2009:v255h [ATNF VLBI Wiki]
• lbaops:lbamar2008:v255a [ATNF VLBI Wiki]
• lbaops:lbasep2009:v255f [ATNF VLBI Wiki]

... Galaxies 99 Cosmic background with model of cloudy interstellar medium Yu. ... Figure 1: Averaged spectrum of the cosmic background I f in frequency range 0.25 200 MHz for the Galactic poles. ... First interpretation of the cosmic noise background spectrum at broad band frequency range 0.25 200 MHz with a model of the cloudy interstellar medium ISM is presented here. ... Synthesized background spectra I f for regions of the Galactic poles at the frequency range 0.25 200 MHz is presented in Fig. ...

Еще в разделе: (Показать все результаты (>327) - www.gao.spb.ru/ )

Еще в разделе: (Показать все результаты (>6162) - xmm.vilspa.esa.es/ )

• XMM-Newton Further EPIC Background Scripts
• XMM-Newton OM Response Files Page
• XMM-Newton Trainee Project 2004

... In the three intervening decades there have been many observations of this diffuse emission over a wide range of x-ray energies. ... During the 1970's researchers at the University of Wisconsin, lead by Dr. William Kraushaar, used a series of sounding rocket flights to map the diffuse x-ray emission from the sky in several bands. ... University of Wisconsin Sky Survey map of the B-band (0.13-0.188 keV) x-ray intensity. ... University of Wisconsin Sky Survey map of the 2-6 keV band x-ray intensity. ...

Еще в разделе: (Показать все результаты (>2449) - hea-www.harvard.edu/ )

• X--ray Quiet PMS Candidates
• Period Determination
• Chandra Images for G116.9+00.2

... Spacecraft . 29b. Satellites looking down . ... 29e. Explorers of distant space . ... The Hubble orbiting telescope. ... The Hubble telescope , in low Earth orbit, overcomes such limitations, in the visible range and in part of the UV. ... So fruitful was this observation that a second "deep field" exposure of such length, near the southern pole of the heavens, was recently conducted. ... Some satellites specialize in observing the Sun, such as the Japanese Yohkoh and NASA's SOHO . ...

Еще в разделе: (Показать все результаты (>6285) - www.cosmos.ru/ )

• Interball Workshop Posters
• Multipoint correlations of the solar wind parameters observed by several
• Spacecraft Observing Earth's Space Environment

The Hubble orbiting telescope. The Earth's atmosphere, while transparent to visible light, absorbs most "electromagnetic radiations" which belong to the same family as light: parts of the infra-red (IR) and all of the ultra-violet (UV), X-rays and gamma rays. ... The Hubble telescope , in low Earth orbit, overcomes such limitations, in the visible range and in part of the UV. ... Some satellites specialize in observing the Sun, such as the Japanese Yohkoh and NASA's SOHO . ...

Еще в разделе: (Показать все результаты (>858) - www.iki.rssi.ru/ )

• The Sun -- History
• Spacecraft Observing Earth's Space Environment
• Sun [Oulu]

In 2007-2008, the planet Uranus will reach one of its annual equinoxes for the first time since 1966. As a consequence, its five major satellites orbiting in the equatorial plane will undergo a season of mutual eclipses and occultations very similar to the one that Jupiter's Galilean satellites undergo every 6 years. ... Some of these events occur when Uranus is at conjunction, or the satellite is transiting or too close to the limb of the planet. ... Complete table of events . ...

Еще в разделе: (Показать все результаты (>2518) - star.arm.ac.uk/ )

• Observing Jupiter | International Year of Astronomy in Ireland | Astronomy 2009
• First Observation of a Close Earth-Approaching Near-Earth Asteroid Using the
• HISTORICAL BACKGROUND

Next: Radial velocity of the Up: Optical spectrum of IRAS04296 Previous: Observations and spectra reduction . ... However, molecular emission features are only very rarely observed in the optical spectra of PPNe. ... On the other hand, it is well known that cometary nuclei spectra show prominent Swan band emission. In both spectra of IRAS04296 we have discovered strong emission in the (0;0) and (0;1) bands of the Swan system of the molecule. ... Now consider the case of IRAS04296. ...

Еще в разделе: (Показать все результаты (>900) - jet.sao.ru/ )

• Experiment COLD: Astrophysical Problems Studied in Experiment Cold
• Fabry-Perot Interferometer: Gallery Old
• The spectrograph design and the observing procedure

We report here on those proposed UIT targets that, in fact, were successfully acquired. ... Note on Filters: . A1 centered at 2500 angstroms with a width of 1200 angstroms . ... NGC 2300 is in a small group of galaxies which has a substantial amount of X-ray emission. ... LUNA again for 777 through lots of filters. ... Supernova 1987A in the Large Magellanic Cloud was observed for 3740 seconds through B5, A1 and B1. ... NGC 5128 or Cen A was observed for 1454 seconds through the B1 filter. ...

Еще в разделе: (Показать все результаты (>397) - zebu.uoregon.edu/ )

... The following charts/text are intended as tools for monitoring the Type Ia supernovae ( SNe ) event visually or photographically (utilizing telescope equipped CCD equipment).The files include: A replication of The Type Ia SNe , V- magnitude (with data point checks from other cited references)and color index (B-V) templete (to indicate a general color-related trend of the type Ia ... I believe this might help alleviate some of the problems involving the making of acceptable amateur light curves...

Еще в разделе: (Показать все результаты (>3062) - www.sai.msu.su/ )

• Contributions by amateurs: SN1996bk.
• Contributions by amateurs: SN1996X.

... Observing . ... Home Education Workshops at Adorama Astronomy Workshop: Observing Variable Stars from the City ? February 15, 2015 . ... Beyond New York City . ... Observing Resources for Amateur Astronomers - Part 1: Beginning Observers . ... A History of the First Forty Years of the Amateur Astronomers Association . ... Presented by€а Adorama €аFor the Amateur Astronomers Association of New York . ... 2016 Amateur Astronomers Association of New York Designed by Press Customizr Powered by . ...

Еще в разделе: (Показать все результаты (>620) - www.aaa.org/ )

• Observing ? Amateur Astronomers Association of New York
• Observing Events ? Amateur Astronomers Association of New York
• High Line ? Solar Observing ? Amateur Astronomers Association of New York

... After removal of foreground radio sources brighter than 10 mJy, using the Ryle Telescope, the resulting map shows evidence for residual structure on a scale of approximately half a degree with rms variation of 18 mJy. Multi-frequency measurements will be used in the future to discriminate between Galactic and cosmic microwave background radiation (CMBR) components of this anisotropy. ... The COBE satellite has already detected anisotropies at a level of on an angular scale of about Smoot et al. ...

Еще в разделе: (Показать все результаты (>2350) - www.mrao.cam.ac.uk/ )

• PPEUC Programme - Cosmic Microwave Background Workshop
• Astrophysics Group VSA
• Abstract

... For observations we selected all Case galaxies in the zone = - from the Case lists III, IV, V, VIII, XI, XII and XIII which were classified in the Case survey by some indication on presense of [O III ] 4959,5007 emission lines (vs - very strong, s - strong, m - medium, w - weak, w? - weak?) and which had not been observed yet. ... Аdditionally nine Markarian galaxies in the same sky region were observed in hope to have better completeness in picking up all probable BCGs. ...

Еще в разделе: (Показать все результаты (>1595) - www.sao.ru/ )

• Up-date RC-sources Spectra
• Results of observations
• Getting the observations

... They are concerned with Attitude Control System of the spacecraft, satellite visibility from tracking stations, limits on the satellite autonomous operations during the orbit, and needs for auxiliary operations with the spacecraft. ... Among the operational constraints the most important one is the number of programmed slews per orbit, which determines the maximum number of radio sources to be observed during one orbit. ... System temperature (K) . ... Progress of the RadioAstron Project in Pictures...

Еще в разделе: (Показать все результаты (>183) - www.asc.rssi.ru/ )

• RSOG Pre-Observation Products

RADIOASTROPHYSICAL DEPARTMENT • INSTITUTE OF SOLAR-TERRESTRIAL PHYSICS RAS SB . General information Main characteristics of the Radio telescope Observing programs General view of the antenna array Main research areas Principle of generation of radio images Radio telescope 's beam Receiving systems Main characteristics of the base receiving-recording complex Calibrations Data archive and databases Publication SSRT - Siberian Solar Radio Telescope . ...

Еще в разделе: (Показать все результаты (>42) - ssrt.iszf.irk.ru/ )

Home . ... Observing . Exposure Time Calculator (ETC) . Survey processing . ... ESO - Public Surveys . near IR surveys . ... Exposure Time Calculator . ... Survey Area Definition Tool . Recommended values for Detector Integration Time (DIT) . ... Detector Properties . ... Filter properties . ... ESO ][ VISTA Home ] ...

Еще в разделе: (Показать все результаты (>27) - www.vista.ac.uk/ )

• VISTA ETC - Exposure Time Calculator
• VISTA - Visible and Infrared Survey Telescope for Astronomy