... 375: Candidate Quark Star . ... Credit: M. van Kerkwijk ( Institute of Astronomy, Utrecht ), S. Kulkarni ( Caltech ), VLT Kueyen, ESO Explanation: Why is RJX J185635-375 so cool and so dim? ... One hypothesized solution holds hope a RJX J185635-375 is actually a not a neutron star but a quark star -- something new. ... Публикации с ключевыми словами: RXJ1856.5-3754 - quark stars - neutron star - кварки - нейтронные звезды - кварковые звезды . ... IC 443: остаток сверхновой и нейтронная звезда . ...

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• XWare > APOD

... 2002 April 14 . RX J185635-375: Candidate Quark Star . ... Previously, this compact star held claim to being the closest neutron star -- only 150 light-years away. ... One hypothesized solution holds hope a RJX J185635-375 is actually a not a neutron star but a quark star -- something new. ... Quark stars, were they to exist, can be intermediate between neutron stars and black holes in size and density. Quark stars can also be more compact and cool faster than neutron stars. ... About APOD | ...

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• APOD: 2003 February 11 - Dumbbell Nebula Close Up from Hubble
• APOD: 2011 July 3 - Alpha Centauri: The Closest Star System
• APOD: 2003 March 23 - Alpha Centauri: The Closest Star System

... Figure 8: Can you detect the motion of the near-Earth asteroid 2000PH against the background stars during its close approach to Earth around 27 July 2004? ... Down) observed and imaged the unusual near-Earth asteroid 2000PH during its close approach to the Earth around 27 July 2004. The observations were carried out remotely using the new 2m aperture Faulkes telescope situated on the 10,000-foot summit of Haleakala, on the island of Maui in Hawaii. ...

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• Coronal Bright Points: Another Oscillating Environment
• Bright Point Studies
• Anatomy of a decline

... We have been using it to analyze PC images of known gravitational lenses and QSOs which are candidates for lensing (Falco 1993). ... Fig. 1 plots the higher contours of the PC image of 0142 in the upper left, and its power spectrum in the upper right. ... If we fit the envelope of the power spectrum with a binary model, we find that best fit gives a separation of the two components of 1.3 PC pixels or about 58 mas. ... The lower two curves are cuts through the 0142 power spectrum. ...

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• HST Spectral Maps of Accretion Disks in Cataclysmic Binaries
• Photometry
• Spatially Resolved Narrow-Band Imagery of the Compact Planetary Nebulae Hu 2-1

... Bojan Nikolic web pages (r. 329) . A gallery of interacting galaxies . ... The history of star formation and mass assembly in early-type galaxies . ... Abstract . ... Complete plots of radiospec analysis . Analysis of (radio) spectra . ... Nested Sampling in R & analysis of spectra . ... Paper II: Spinning dust in galaxies . ... The search results are restrict to these pages only . ... Copyright 2005 -- 2016, Bojan Nikolic feedback welcome ...

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• Inference of Coefficients for Use in Phase Correction Bojan Nikolic web pages
• A gallery of interacting galaxies Bojan Nikolic web pages (r. 329)
• Analysis of (radio) spectra Bojan Nikolic web pages (r. 329)

... It provides long range planning information to the scheduling team; it provides bright object, timing, and orientation information to the observation planning team; and it provides graphical description of the observations and their constraints. ... The GUI graphically displays the constraints that are computed by Spike and stored in the description files and in the database. ... BOAS processes all bright objects that have entered the database since the last time BOAS was run. ...

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• Classification of Objects in the Guide Star Catalog
• ADASS 2003 Conference Proceedings
• Starfinder: a Code for Crowded Stellar Fields Analysis

Next: Reducing the observations Up: PEPSYS general photometry Previous: Influencing the plan . ... If the telescope and instrumentation are unfamiliar to you, you may have trouble keeping to the schedule for the first night or two, so try to work with a previous observer on the equipment for a night or two of training before your observing run. If you fall behind, try to keep as many low-altitude observations of extinction stars as you can, and drop some circumzenithal ones if necessary. ...

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• Source Positions
• Introduction
• Closing down

... Analysis of in-orbit data closely follow the CSL data analysis. Stars with known astrometric positions are matched with their image centroids. ... The measured position, the expected position and the offset between the measured and expected positions are calculated and written into a file. ... select catalogued positions for different observations/pointings (e.g. positions of objects in photometric sequence) . ... The new distortion map was generated from in-flight observations of the G153 field. ...

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• Point-Spread Function Fitting
• Previous RGS source list.

... ATNF Home . About ATNF . ... About ATNF overview . ... Australia Telescope Steering Committee . ... Australia Telescope User Committee . ... Murchison Radio-astronomy Observatory . ... Parkes radio telescope . Australia Telescope Compact Array . Mopra radio telescope . ... Parkes | ... Visiting Parkes radio telescope . ... Parkes radio telescope webcam . ... The first claim that HI could be associated with a dSph-like system was for the dIrr/dSph system Phoenix (Carignan, Demers & CУДtУ? ...

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• New HI Observations of the Prototype Polar Ring Galaxy NGC 4650A
• The Brightest Galaxies from HIPASS
• HIPASS Bright Galaxy Catalog

... Actual stars are expected to be more complicated than these simulations. ... The spot may be entirely visible most of the time (one would observe a prolonged flux minimum low), and then part of it may disappear over the horizon briefly and then return (slow rise and then fall back to constant level). ... With the set of observations taken here, I have information available from several comparison stars and color information. ... The period found must be consistent with the data from any given night....

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• An example of a typical timing analysis
• Period Determination
• X--ray Activity and PMS Stars.

Asteroid 2005 YU55 was listed on NASA's "Sentry Risk Page" as having as small (about one in 10 million) chance of hitting the Earth in the next century. We observed this asteroid with the Arecibo Planetary Radar system on April 19-23 2010. ... We obtained radar images of asteroid 2005 YU55 at 11 PM local time on 2011 Nov 9 using the Arecibo Observatory Planetary Radar System in Puerto Rico and the Robert W. Byrd Green Bank Telescope in West Virginia. ... Last modified 2011 November 14 . ...

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• asteroid 200YU55
• Astronomy at Arecibo Observatory
• The Search for HVCs in Other Galaxies

... General information . ... Staff . Research staff . Technical, administrative & librarian staff . ... Staff in alphabetic order . Research . ... Technical reports . Projects . ... General interest seminars . ... IT Services . ... Information . Resources and catalogs . ... Historical highlights . Historical research . Historical archive . ... Projects and events . Online resources . ...

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• ISOGAL YSO Candidates (Abstract)
• Algorithm
• Comet Shoemaker-Levy 9

... 9a. Earth orbits Sun? . ... 10a. Scale of Solar Sys. ... If the mean distance of Earth from the Sun is 1 AU ("Astronomical Unit"), then that of Venus is 0.723 AU, of Mercury 0.387 AU and that of Mars is 1.524 AU. ... By noting (1) where on the Sun's disk is the crossing seen, (2) timing its duration at two far-apart points on Earth, and (3) comparing the times, one can calculate the distance to Venus and from it the scale of the solar system. ... One occurred in 1639--too early. ...

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• VEGA Mission
• The Brightest Moon
• Two points (INTERBALL-1 and MAGION-4) observations of magnetopause motion

... Its perihelion would occur on April 1, 1997, at which point the comet would be only 0.92 astronomical units from the Sun, just within the orbit of Earth. ... Taken in April 1993, the photo showed the comet over 13 astronomical units from the Sun, well beyond the orbit of Saturn. ... Hale, as in Comet Hale-Bopp, has written a book, Everybody's Comet (available through the ASP Catalog) and coordinated an Internet project, "Hale-Bopp: Live in the American Classroom." ... Anatomy of a comet. ...

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• ASP: Star Science in the Autumn Sky
• ASP: A Taste of Real Astronomy ? The ESA/ESO Astronomy Exercises

... The greater the distance, the smaller the parallax. ... That triangle has the same proportions as the much larger triangle ABC, and therefore, if the distance B'C to the thumb is 10 times the distance A'B' between the eyes, the distance AC to the far landmark is also 10 times the distance AB. ... The most distant objects our eyes can see are the stars, and they are very far indeed: light which moves at 300,000 kilometers (186,000 miles) per second, would take years, often many years, to reach them. ...

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• Saturn's Possible New Moons
• Comet Shoemaker-Levy 9
• Close-up of the Aurora

2007 Jan 08) Bright comet C/2006 P1 (McNaught) . 2005 Jan 20) Tornado near Coonabarabran . 2005 Jan 16) Major upgrade in progress . 2005 Jan 16) Near Earth Comet 162P/Siding Spring . 2004 Apr) 2004 CB identified as a comet . 2004 Apr) Systematic surveying commenced 2004 March 16 . 2004 Apr) Media Releases on commencement of survey . 2004 Jan) 'Accidental' discovery of 2003 XB22 . ... Siding Spring Survey Main Page . ... Previous News Items . ...

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• Spectroscopy
• Sky Brightness
• What?s this got to do with velocities?

... Field of interest: data analysis and interpretation of X-ray observations of BHC and NS systems, astrophysics of compact objects and related phenomena: X-ray , optical and radio observations , shocks and stellar winds, emission mechanism, the spectral and timing analysis of the X-ray emission from microquasars ( signature of accreting BH), atoll- and Z-sources ( signature of accreting NS), modeling of INTEGRAL images % . ...

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• Tatjana Khruzina
• Igor Antokhin

In this gallery are many images of Low Surface Brightness Galaxies which have recently been discovered and analyzed. ... The central surface brightness of this galaxy is 24.28 . Malin 2 This galaxy is another huge disk galaxy with a scale length of 15 kpc and a redshift of 15000 km/a. The high surface brightness knot in one of its spiral arms actually has the same color, luminosity and H-alpha equivalent width as the entire Large Magellanic Cloud . ... Truly it is a Low Surface Brightness Galaxy. ...

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• Galaxy Gallery Page II
• Astro-2 and the UIT Experiment

... Suppose that a NS having a rotational magnetic ? luminosity forms a binary system (with semi-major axis a ) with a normal star losing matter in the form of stellar wind (with a loss rate ). ... This means that while deriving the formula for a cavern in the general case, we must take into account the proximity of the normal star. ... It follows from the symmetry considerations that at the anterior point of the cavern (i.e. the point closest to the normal star), . ... If , the cavern is closed. ...

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• Gamma-Ray Bursts
• Initial Distributions of Binary Parameters
• The Radiopulsar PSRB1259-63?- a Probe in the Stellar Wind Plasma

... 1000 ? 1004 . Radar Investigations of Comets . ... The review of results of all six previous radar observations, as well as an analysis of forthcoming close approaches of known short-period comets with Earth for the next 25 year interval indicate the evidence of potential possibility of episodic researches this objects by means of upgraded bistatic radar system Evpatoria (70-m dish, 6-cm power transmitter) ? Effelsberg (100-m dish, two-channel low-noise receiver). ...

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