... Tonight's Sky . ... The Magazine . ... Observing . ... The double star 54 Leonis, spiral galaxy NGC 3198, and emission nebula NGC 3199 . ... Astronomy for Kids . ... Observing springtime deep-sky objects with a large telescope . ... Bright planets meet at dusk . ... Astronomy magazine subscribers can read the full article for free. ... Get instant access to subscriber content on Astronomy.com! ... Receive news, sky-event information, observing tips, and more from Astronomy's weekly email newsletter....

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... The positive fragments mainly sit in the middle of the FOV; negative fragments are located at both to the west and east. ... In the west, positive fragments move towards the negative ones and cancellation continues. ... The remaining positive ones keep moving towards the negative ones and cancellation continues. Some positive fragments become stronger and then move from the south towards the negative ones to the east and cancellation occurs. Positive fragments in the west nearly disappear. ...

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• http://star.arm.ac.uk/highlights/2012/603/bp_mag/VisualAnalysis/130109/130109_01.pdf
• http://star.arm.ac.uk/highlights/2012/603/bp_mag/VisualAnalysis/091107/091107_02.pdf
• http://star.arm.ac.uk/highlights/2012/603/bp_mag/VisualAnalysis/121107/121107_07.pdf

... ARC 3.5m | Weather Closure Conditions . The enclosure will be closed by the Observing Specialist under the following conditions. ... This policy will be consulted whenever there are questions or disagreements concerning closure of the APO 3.5-meter telescope due to hazardous conditions or situations, at times when telescope operations are being overseen by an APO Observing Specialist. ... the on-duty Observing Specialist has full responsibility, and sole authority, to make this decision. ...

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Weekly Bulletin on Solar and Geomagnetic Activity Highlights on 09 - 15.11.2015, Forecast on 16 - 123.11.2015, Carrington Rotation 2170 (31,87.11.2015) SUNSPOT-FORMING ACTIVITY OF THE SUN REMAINED AT THE AVERAGE LEVEL, HOWEVER ON 12.11 FELL TO THE LOW. ... Fl AО CME 11.11 <1330 >1734 N02W21L242 ~10 B8.1 12449 CME 15.11 2255 0140 S16W24L186 21 СМЕ ---------------------------------------------------------------------- NEXT WEEK FLARE ACTIVITY IS EXPECTED AT THE LOW AND AVERAGE LEVELS. ...

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• http://www.izmiran.rssi.ru/services/saf/archive/en/2015/obzor20150413.en.txt
• http://www.izmiran.rssi.ru/services/saf/archive/en/2014/obzor20140714.en.txt
• http://www.izmiran.rssi.ru/services/saf/archive/en/2014/obzor20140224.en.txt

... Comet McNaught Becoming Visible to the Unaided Eye . ... Credit Copyright: Jose Francisco Hernandez ( Altamira Observartory ) Explanation: A new comet is brightening and is now expected to become visible to the unaided eye later this month. ... Although predicting the brightness of comets is notoriously difficult, current estimates place Comet McNaught as becoming visible to unaided northern hemisphere observers in late June, before sunrise, and in early July, after sunset. ... June . July . ...

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• Астронет > Comet McNaught Becoming Visible to the Unaided Eye
• XWare > APOD

... 2010 June 7 . Comet McNaught Becoming Visible to the Unaided Eye . ... Explanation: A new comet is brightening and is now expected to become visible to the unaided eye later this month. ... Although predicting the brightness of comets is notoriously difficult, current estimates place Comet McNaught as becoming visible to unaided northern hemisphere observers in late June, before sunrise, and in early July, after sunset. ... About APOD | ... NASA Official: Phillip Newman Specific rights apply . ...

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• APOD: 2006 October 28 - Comet SWAN Outburst
• APOD: 2002 March 7 - Comet Ikeya-Zhang Brightens
• Contributions by amateurs: SN1995V.

... Under certain conditions, like those in the nucleus of a QSO, all atoms can be made to emit light at particular wavelengths. ... If that source is approaching the observer, the wave is squashed up onto itself making the wavelength shorter. ... This is redshift. ... You can see how the section of the QSO spectrum which we observe changes with redshift. ... We then see how far we had to slide the observed spectrum along the scale to make it match and that is the objects redshift. ... The 2QZ team . ...

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... 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 . ...

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• The Solar Wind
• The Acceleration of the Aurora
• The Io Dynamo

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 . ...

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• Sunspots [Oulu]
• Magnetic Fields
• The Solar Wind

... 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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• The AstroStat Slog Banff Challenge
• The AstroStat Slog Efron
• ChaMPlane

... ATNF Home . About ATNF . ... About ATNF overview . ... Australia Telescope Steering Committee . ... Australia Telescope User Committee . ... Facilities . ATNF facilities . ... Australian Square Kilometre Array Pathfinder . Murchison Radio-astronomy Observatory . ... Parkes radio telescope . Australia Telescope Compact Array . Mopra radio telescope . ... ATCA . ... Visiting Parkes radio telescope . Visiting Australia Telescope Compact Array . ... Parkes radio telescope webcam . ...

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• Source size measurement from observed quasar microlensing
• LMC HII Region Luminosities versus Observed Ionizing Stars
• The Grus-Quartet

... One of this year's largest mass ejections from the Sun's atmosphere was recorded last Sunday by TESIS telescopes aboard the CORONAS-PHOTON satellite ( video - wmv 4.3 MB ). ... Over the course of a week, two gigantic solar prominences were simultaneously ejected from the surface of the Sun. ... Earth will not feel the Sun's influence either. ... The TESIS observatory ї TESIS: www.tesis.lebedev.ru . ... One of this year's largest mass ejections from the Sun's atmosphere (movie WMV, 4.3 MB) . ...

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• The culmination of the solar eclipse coincided with the strongest magnetic
• Magnetic storms online March 09, 2012
• Magnetic storms online June 01, 2013

... M94 or NGc 4736 is an early type spiral galaxy with tightly would spiral structure and a dominant, luminous central bulge. ... This exposure was for 1724 seconds through A1 and B1. ... NGC 7789 is an open stellar cluster in the Galaxy. This exposure is 1351 seconds through B5. ... The Coma Cluster of galaxies was observed for 1850 seconds through the A1 filter. ... NGC 1313 A spiral galaxy in the Fornax Cluster and host of two recent supernova was observed for 1384 seconds through A1 and B5. ...

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... Home Lectures Lecture Series 2011-2012 Lecture Series 2011-2012 ? тАЬA Ray of Light in a Sea of Dark (Matter)тАЭ ? Charles Keeton . ... Charles Keeton , associate professor of physics and astronomy at Rutgers University and faculty director of the Aresty Research Center for Undergraduates , will speak to the AAA Friday, March 2, on тАЬA Ray of Light in a Sea of Dark (Matter).тАЭ The free public lecture begins at 6:15 p.m. in the Kaufmann Theater of the€а American Museum of Natural History . ...

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• Astronomy Workshop: Observing Variable Stars from the City ? February 15, 2015
• Lecture Series 2015-2016 ? Amateur Astronomers Association of New York
• Woodlawn Cemetery, Bronx ? Amateur Astronomers Association of New York

... 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: Guest Observer
• ASP: December's Total Lunar Eclipse
• ASP: The Comet About to Smash into Jupiter

. First page Back Continue Last page Summary Graphics .

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• How to Observe Pulsars at the Arecibo Observatory
• CIMA Auto-Observing

... GPI Data Pipeline 1.0 documentation . ... Thermal/Sky Backgrounds . ... Using Thermal/Sky Backgrounds in GPI Data Reduction: . Creating Calibrations: . ... Thermal emission (from sky or telescope) becomes an important background source for wavelengths longer than 2 microns. ... The pipeline treats thermal/sky backgrounds similar to dark frames and is designed to subtract a thermal/sky background, scaled to the integration time of the science image, from K-band observations. ...

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• Observing Program Email Folders
• Observing Windows [Windows]
• Future Calibrations, Calibration by Observers, and Calibration Outsourcing

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• Wavelength calibration
• Using Target Visibility Checker, V8.0
• Using Target Visibility Checker

Astronotes Armagh Planetarium's Stellar Blog! ... Space Flight . ... Posted on February 6, 2014 | 2 Comments While the winter sky may be the тАШAladdinтАЩs caveтАЩ for skywatchers, and we may already have plundered deeply one of its greatest celestial treasures, the constellation of Orion, we forge [ ] . Continue Reading.. Posted on January 22, 2014 | ... Posted on December 6, 2013 | ... Posted on November 6, 2013 | ... Posted on October 4, 2013 | ... Posted on September 9, 2013 | ...

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• observing | Astronotes - Part 2
• observing | Astronotes
• Where and When to See Comet PANSTARRS | Astronotes

... Fitting the observed dependence includes calculations of the polarization cross-sections averaged over particles orientation and size distribution, their normalization and the comparison of obtained dependencies with Serkowski's curve representing observational data for a chosen star. ... Variations of the polarization factors with wavelength are shown in Fig. 16 for homogeneous spheroidal particles with PF orientation. ... The distinction between prolate and oblate spheroids is also clearly seen. ...

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• Wavelength dependence