Astronomy Picture of the Day . ... This burster triggered orbiting gamma-ray observatories on December 14, 1997 and within 6.5 hours the sensitive X-ray cameras onboard BeppoSAX had been turned to record the first image (left) of the afterglow. ... M83: A Barred Spiral Galaxy . ... M83 is a member of the Centaurus group of galaxies, a nearby group dominated by the massive galaxy Centaurus A. It takes light about 15 million years to reach us from M83. ... Bright Comet SOHO . ... First page ] Prev. ...

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... Bad Astronomy . ... Bitesize Astronomy . ... Last week's Snack talked about how black holes can affect the environment around them in such a way as to be very bright . ... It's a common misconception that black holes always have matter swirling into them. ... As this matter gets closer and closer to the black hole it piles up and a large, fairly flat disk forms. This is called the accretion disk , because matter from this disk accretes (that is, falls in) on the black hole. ... 2008 Phil Plait. ...

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... December 8, 1998 . Leonids from Leo . ... Explanation: Is Leo leaking? Leo , the famous sky constellation visible on the left of the above all-sky photograph , appears to be the source of all the meteors seen in this year's Leonids Meteor Shower . ... Sand-sized debris expelled from Comet Tempel-Tuttle follows a well-defined orbit about our Sun, and the part of the orbit that approaches Earth is superposed in front of the constellation Leo. ... About APOD > . ...

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• APOD: 2003 December 16 - Retrograde Mars
• APOD: 2000 December 27 - The Dust and Ion Tails of Comet Hale Bopp
• APOD: 2002 December 27 - X Ray Mystery in RCW 38

... Armagh Observatory, College Hill, Armagh BT61 9DG, +44 (0)28 3752 2928 . ... Although the comet itself never comes dangerously close to the Earth, the particles of dust that it has shed during its many past passages through perihelion found their way into the Earth's atmosphere, appearing as meteors in the cold December sky. ... Animation 1 . ... An Ursid meteor captured by the Armagh Observatory's NE-facing meteor camera in the early morning of 23rd December. ... Meteor Showers Online . ...

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• Geminid Meteors
• The Twins' Meteors, Geminid Meteors

... 2000 December 15 . IC443's Neutron Star . ... Explanation: Using x-ray data from the orbiting Chandra Observatory along with radio data from the Very Large Array , a team of researchers has discovered evidence for a new example of one of the most bizarre objects known to modern astrophysics -- a neutron star . ... The core collapsed when the star, located a reassuring 5,000 light-years away in the constellation Gemini , exploded long ago. How long ago? ... About APOD | ... NASA Technical Rep.: ...

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• Astronomy Picture of the Day
• APOD: December 22, 1996 - 18 Miles From Deimos
• New Discoveries From Galileo

... Gift Center . ... Why do aurorae appear strongest within rings centered on Earth's poles instead of filled-in circles? ... RELATED TOPICS: AURORAE . The visible aurorae result from electrons that move along magnetic field lines from space into the upper atmosphere. ... Just make sure you're registered with the website. Get instant access to subscriber content on Astronomy.com! ... If you are already registered on Astronomy.com, please log in below. ...

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• Why do the constellations and the Moon appear upside down from the Southern
• How were the constellation boundaries set? They appear pretty arbitrary. |
• Can you explain Mercury's retrograde motion? Do other planets appear to do this

Astronotes Armagh Planetarium's Stellar Blog! ... Space Flight . ... Earth Satellites . ... Leonid meteors seen from 13 km altitude aboard an aircraft during the 1999 Leonids Multi-Instrument Aircraft Campaign (Leonid-MAC). Comet Tempel-Tuttle provides the cometary debris for the Leonid meteor shower. ... Every 17-19 November Earth crosses Tempel-TuttleтАЩs orbit and the Leonids become visible. With clear, dark skies observers may see 10 to 15 Leonid meteors every hour on those mornings. ...

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• Stargazing in December | Astronotes
• Apollo 17 | Astronotes

... The material contained in this Handbook is derived from ground tests and design information obtained by the IDT and the engineering team at JPL, and from on-orbit measurements. ... HST Phase II Proposal Instructions , (Version 8.0, 15 December 1995). ... Calibrating Hubble Space Telescope: Post Service Mission (1995).1 . ... The Imaging Performance of the Hubble Space Telescope , Burrows, C. J., et. al., ... The Performance and Calibration of WFPC2 on the Hubble Space Telescope, Holtzman, J., et al....

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• HST Call for Proposals
• Gamma-Ray Bursts
• Initial Hypotheses

... Main . ... Software . ... The Fakerat is a software package to help planning of observations with the RadioAstron mission. This version of the software has been designed to match the technical information that appears . in the RadioAstron User's Handbook . Fakerat, version 16, Linux distribution; release on December 27, 2013: . ... fakerat file . fakerat_lib file . readme file . install file . ... package src . Software complex ASL , Windows and Linux distributions. ...

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XMMNewton EPIC MOS MOS1 CCD1 Hot Column Tony Abbey ­ University of Leicester Tony Abbey afa@star.le.ac.uk XMM Cal/Ops meeting - ESAC, Spain ­ 3 Oct 2005 XMM impacts history XMMNewton EPIC MOS XMM was launched on 10 December 1999 into a highly elliptical orbit and each revolution takes 2 days. ... This was done on rev 1044 ? Review level of column 324 at 3 month intervals and adjust as necessary Tony Abbey afa@star.le.ac.uk XMM Cal/Ops meeting - ESAC, Spain ­ 3 Oct 2005 ...

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... It's a Meteor Shower Smaller than grains of sand, meteors vaporize in a bright streak of light as they hit Earth's atmosphere. Meteor showers come from comets, but the sporadic meteors on other nights are mostly asteroid bits. ... Meteor Showers Come From Comets Jupiter Earth Sun Comet Mercury Tips: A bright Moon can wash out meteors, making them hard to see. ... But the comet bits hit Earth's atmosphere so fast, the pieces vaporize in bright streaks -- making a meteor shower! ...

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• ASP: Articles on Education from Mercury Magazine
• ASP: A Flag for Mars
• ASP: This Restless Globe

Regions designation | Regions models | ASCII files description . The real time regions passing . ... The IB_TAIL geocentric distance as a function of the UT (Plot) . Geomagnetic local time in the IB_TAIL position as a function of the UT (Plot) . The orbital data ASCII files . The IB_TAIL magnetic mapping and conjugations with groundbased instruments and anothers spacecraft . ... IKI RAN | SSC IKI RAN | INTERBALL mission  ...

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• IB_MAG5 December 1999 during operations scheduling
• INTERBALL IB_TAIL December 1999 during operation scheduling
• INTERBALL IB_TAIL December 1997

THE RELATIVE MONTHLY MEAN SUNSPOT NUMBER ON DECEMBER 2013 HAS MADE Wdec.= 61.4, THAT GIVES FOR 42 MONTH (2012, JUNE) DEVELOPMENT CURRENT 24 CYCLES OF SOLAR ACTIVITY THE SMOOTHED MONTHLY MEAN SUNSPOT NUMBER W*june= 61.7 THE BEGINNING 24 CYCLES OF SOLAR ACTIVITY - I 2009 with W*=1.8 THE MOST PROBABLE TIME OF THE MAXIMUM OF THE CURRENT CYCLE- XI.2012 - III 2013 THE MOST PROBABLE HEIGHT OF THE MAXIMUM - Wmax = 66 - 75. ... NEXT WEEK THE LEVEL OF SUNSPOT ACTIVITY IS EXPECTED TO BE THE HIGH AND AVERAGE. ...

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• http://www.izmiran.rssi.ru/services/saf/archive/en/2012/obzor20120702.en.txt
• http://www.izmiran.rssi.ru/services/saf/archive/en/2015/obzor20150810.en.txt
• http://www.izmiran.rssi.ru/services/saf/archive/en/2016/obzor20160104.en.txt

The Wind spacecraft. ... It was designed to observe the solar wind approaching Earth, from a position near the Lagrangian point L1, and it is part of the International Solar-Terrestrial Physics (ISTP) Initiative . ... The original plan called for "Wind" to approach its final station over two years, undergoing two close encounters with the Moon to boost its speed. ... For additional details and updates, see the home page of the "Wind" mission. Exploration" home page (index) Glossary . ...

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• The Sun
• The Acceleration of the Aurora
• Galileo Mission Status - December 10, 1995

A Brief History of the Discovery of Cosmic Gamma-Ray Bursts - draft april 17, 1995 - J.Bonnell In October of 1963 the US Air Force launched the first in a series of satellites inspired by a recently signed nuclear test ban treaty. ... The event appeared to be a cosmic gamma-ray burst but at the time the constellation of satellites did not have sufficient timing resolution at the trigger to make a good determination of direction to the burst source. ...

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• Evolution of Magnetic Rotators in Non-circular Orbits
• Seminars

Last modified: 14 September 1997 . Original version 14 September 1997 . Modified: . This page contains the schedule for HALCA observations from September 14 to December 31, 1997. The observations in September and October are firm, but changes will still be made for November and December. Please check this schedule about once per week. The changes made at any modified date will be listed. ... The number of changes in the previous schedule was becoming too large. ...

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• VSOP Observing Schedule

... S.P. KOROLEV ROCKET AND SPACE CORPORATION ENERGIA . ... OAO RSC "Energia" . ... News . ... S.P. Korolev RSC Energia is the prime manned space flight organization in the Russian rocket and space industry, responsible for the development of the ISS Russian Segment, its integration into the Space Station and its operation, including development and operation of its principal modules (Zvezda, Pirs, Poisk, Rassvet, etc.), manufacturing, launch and operation of Soyuz TMA and Progress M spacecraft. ...

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• S.P.Korolev RSC Energia - SCIENTIFIC-EDUCATIONAL PROGRAM
• S.P.Korolev RSC Energia - LAUNCHERS
• INTERNATIONAL SPACE STATION

... May 27, 2009 - The CORONAS-PHOTON has registered the formation of the Sun's southern belt of activity . The Russian TESIS/ CORONAS-PHOTON Solar Observatory, which has been working in orbit since January 30th, 2009, has photographed one of the most important events in the build up to the upcoming solar cycle - the formation of our star's new southern belt of activity. The first magnetic fields of the new cycle in the southern hemisphere appeared on the Sun's surface on May 23-24th. ...

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• The CORONAS-PHOTON has registered the formation of the Sun's southern belt of
• Space weather forecast December 01, 2015
• Space weather forecast December 03, 2015

Seven months ago, on Mar 19, 2008, at 09:12 Moscow time, a new star appeared on the sky. The Sun had already risen over the Russia, but people of the Western hemisphere might be able to see by their eyes a faint starlet near one of Bootes constellation stars. This starlet appeared and faded by an order of magnitude in a minute. Astronomers named it GRB080319B or, informally, the Naked-Eye Burst, as it was twice as bright as human eye can see a star. ... Royal Astronomical Society . ...

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• Workshop 2015
• Detection of unique bright radio flare of X-ray binary
• Galaxy sector, archive 2004

The Earth. ... The middle raiding of the Earth is 6371,032 km, the pole 6356,777 km equatorial - 6378,160 km. The Earth surface area is 510,2 mln km^2, 70,8% of which is the World ocean. ... According to the modern cosmogonical views the Earth was formed 4,6 - 4,7 billions years ago from the protoplanet cloud captured by the Sun. ... The Earth is conditionally divided into 3 parts: a bark a cloak and a core (in the centre). The external layer - the bark is 35 km thick. ... Above the Earth. ...

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• plutone