. Pulkovo Observatory of Russian Academy of Sciences is situated . near Saint-Petersburg. It was founded in 1839. 196140, Saint-Petersburg, Pulkovskoye chaussee 65/1 . English version . Russian version . This page has been accessed times since May 1, 1999.

... However, to avoid excessive central obscuration, a conical baffle is necessary in addition to the usual primary and secondary baffles. ... At that time, it was complete except several outside ribs remained to be attached and the upper and lower edges needed to be chamferred. ... The cone was measured at four equally spaced locations very near its upper and lower edge (Table 3). ... A tape measure was used to measure four diameters of the baffle at its upper and lower edges (Table 4). ...

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... We have mapped the central region of the spiral galaxy NGC 1808 in the 12CO J=1-0, J=2-1, J=3-2 lines and measured 13CO J=1-0, J=2-1, C18O J=1-0, HCN J=1-0 and an upper limit on CS J=2-1 at the central position. ... The line intensity ratios indicate that the central molecular gas of NGC 1808 is in a state of high excitation compared with giant molecular clouds in the disk of the Milky Way. ... A simple estimate of the pressure felt by these clouds leads to further constrains on their properties. ...

RTT150 . ... The primary mirror 1 reflects light to the secondary mirror 2 which collects it on the focal surface of system with the linear field of 90 mm diameter. Focal length, mm . ... Linear field of view, mm . ... Angular field of view . ... Concentration of light energy at 632.8 nm wavelength . on the optical axis within the circles of diameter: . 0.017 мм, %, at least . ... 0.029 мм, %, at least . ...

... Optical: Oxygen rich. X-ray: Ring of emission, with diffuse central nebula and pulsar. ... ADS . ... 1982, ApJ, 260, L65. Einstein observations. ... Chandra observations, including central nebula. ... Chandra observations. ... Chandra observations of pulsar. ... ATCA at 1.4, 2.3 and 5.2 GHz (9".6?8".0, 7".2?6".2 and 5".5?4".8: S=11.9?0.1, 11.4?0.1 and 8.8?0.1), plus H I observations. ... Optical observations. ... Possible optical counterpart to pulsar and nebula. ... Spitzer observations ADS . ...

STARTEST IMAGES GALLERY . Type: Maksutov Cassegrain . ... Inside Focus . ... Outside Focus . ... These is are the startest images of two alike 6"F/10 Maksutov Cassegrain’s. The central obstruction on these images is slightly larger than in the reality. ... Another rather easy done simulation for the second image from the left in the second table with images. ... Also the middle-ring is brighter in the simulation according to the PSF’s , this is however not so clear when you look at the images. ...

This document's intent is to index all relevant LRP documentation into one coherent location for easy quick access. ... Master GRENDEL directory . Index of the /lrp/ This directory contains a number of interesting reports that are generated as a consequence of the normal LRP flow: Baseline differences (weekly). CVZ reports (daily) Link set reports (daily) Baseline summaries (weekly) LRP run statistics (daily) Scheduler Resource report (daily) Unschedulables report (daily) . ...

The Navy Prototype Optical Interferometer . Articles | ... John Huggins . ... The white buildings house a type of telescope called a siderostat. Each houses a 0.5 meter mirror which collects the starlight and sends it to a mirror system which guides the light to a central building. ... After the starlight hits the siderostat mirrors, additional mirrors guide the light to a feedbeam tube system. ... www.astronomy.net . ... dbHTML," "AstroGuide," "ASTRONOMY.NET" & "VA.NET" . ...

. The hot gas in the galaxy cluster Abell 2052 is being sloshed back and forth. The sloshing was set in motion when a small cluster smashed into the larger central one. The large spiral structure on the outside of the image was also caused by that off-center collision. Sloshing of hot gas like this can affect how the giant elliptical galaxy and its supermassive black hole at the center grow. X-ray: NASA/CXC/BU/L.Blanton; Optical: ESO/VLT

The optical scheme of the instrument is sketched in Figure 1 , it is designed to match the F/20 focal ratio of the TIRGO telescope. We have, following the optical path, the window of the dewar, the order sorting filter (not in figure), a field lens, in Calcium Floride, and the slit, in the focal plane of the telescope. ... The resolving power is (for first order of grating) of about 600 in the center of J band and 950 in the center of the K band, using a slit of two pixel (3.46 arcsec). ...

... astro-ph/0003002 We cross-identified the ROSAT Bright Source Catalog (RBSC) and the NRAO VLA Sky Survey (NVSS) to construct the RBSC-NVSS sample of the brightest X-ray sources (~0.1 counts s^{-1} ~= 10^{-12} ergs cm^-2s^-1 in the 0.1--2.4 keV band) that are also radio sources (S ~= 2.5 mJy at 1.4 GHz) in the 7.8 sr of extragalactic sky with |b| > 15deg and DEC > -40deg. ... We used the more accurate radio positions to make reliable X-ray/radio/optical identifications down to the POSS plate limits. ...

XMM-Newton Calibration Technical Note MOS optical loading XMM-SOC-CAL-TN-0043 Issue 1.1 B.Altieri November 13, 2003 1 Abstract The MOS optical PSF has been analyzed with diagnostic frames acquired on the RGS calibration star AB Doradus in the THIN lter, with the aim to assess the MOS optical loading. ... The MOS1 and MOS2 optical PSFs though the THIN lter are shown in gures 1 & 2 respectively (averaging of all diagnostic frames after deglitching). ...

... Home Observing AAA Urban Starfest in Central Park . ... Urban Starfest in Central Park . ... Beyond New York City . ... AAA In the News . ... Join the Amateur Astronomers Association (AAA) of New York at their annual Autumn Urban Starfest on Saturday, October 17, 2015, starting at 7:00 pm at the Sheep Meadow. ... WHO:€а Amateur Astronomers Association (AAA) of New York€а (aaa.org) and the Urban Park Rangers . ... 2016 Amateur Astronomers Association of New York Designed by Press Customizr Powered by...

... Posts tagged ?central limit theorem? ... Tags: Bayesian , central limit theorem , confidence bounds , error bar , Frequentist , highest posterior density , HPD , likelihoodist , sigma . ... 3 Comments . ... Entries RSS . ... Algorithms arXiv Astro Bad AstroStat Bayesian CHASC Cross-Cultural Data Processing Fitting Frequentist Galaxies gamma-ray High-Energy Imaging Jargon Job Languages MC MCMC Meta Methods Misc News Nuggets Objects Optical Physics Quotes Spectral Stars Stat Timing Uncertainty X-ray ....

X Ray Stars of 47 Tucanae . ... CXO , NASA . ... The x-ray stars here are double stars or "compact" binary star systems . They are so called because one of the pair of stellar companions is a normal star and the other a compact object -- a white dwarf , neutron star , or possibly a black hole . Chandra's x-ray vision detects the presence of an unexpectedly large number of these exotic star systems within 47 Tucanae , but it also indicates the apparent absence of a large central black hole. ...

... The color composite image of Centaurus A reveals the lobes and jets emanating from the active galaxy?s central black hole. ... Astronomers have a new insight into the active galaxy Centaurus A (NGC 5128), as the jets and lobes emanating from the central black hole have been imaged at submillimetre wavelengths for the first time. ... Centaurus A hosts a very active and highly luminous central region, caused by the presence of a supermassive black hole is the source of strong radio and X-ray emission....

The database contains references to the papers, data files and links to the Internet resources related to measurements and calculations of the optical constants in the wavelength interval from X-rays to radio domain. ... References to some useful books and reviews on the subject (e.g. the classical handbooks edited by E.D.Palik) and links to Internet collections of optical constants and personal WWW pages with related software were also placed in the database. You have arrived at our welcome page. ...

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... NOTE: If event is correlated to an optical flare in data prior to 1997, the event times are for the optical event. ... 28 1X 29 A1 N or S for north or south latitude of correlated optical flare, if known. ... 32 A1 E or W for east or west central meridian distance of correlated optical flare, if known. 33-34 I2 Central meridian distance of correlated optical flare, if known. ... 37-59 33X 60 A1 X-ray class: C,M,X code the maximum power of 10 the 1-8 Angstrom flux attains.* ...