... SS433 is a close binary system, one star is a supergiant, a second one is a black hole. ... Even a black hole cannot accept such an enormous mass flux, a supercritical accretion disk appears, all the excess gas glows up to several tens of thousands degrees and is ejected off the disk with enormous velocities. ... SAO researchers have found an evidence of the supercritical accretion onto a black hole in SS433, which follows from a brightness variability of the SS433 disk. ...

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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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M1 image More About M1 Nice Color Picture . ... M16 image More About M16 HST image . ... M31 image More About M31 Nice Color Picture . ... M42 image ; M43 image More About M42/43 Nice Color CCD Picture . M51 image More About M51 Color Image of M51 M51 Supernova . M57 image More About M57 Nice Color CCD Picture Very Deep M57 Image . ... M81 image More About M81 M81 Supernova Ultraviolet Image of M81 More about Ultraviolet Imaging . M82 image More About M82 M82 False Color M82 True Color . ...

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... Observers looking at an object that is moving away from them see light that has a longer wavelength than it had when it was emitted (a redshift), while observers looking at an approaching source see light that is shifted to shorter wavelength (a blueshift). ... By measuring the amount of the shift to the red, we can determine that the bright galaxy is moving away at 3,000 km/sec, which is 1 percent of the speed of light, because its lines are shifted in wavelength by 1 percent to the red. ... Part 2...

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• HyperLEDA documentation: compilation of cz measurements (a110)
• MIT-GB catalog

Start CIMA from the right-mouse-button menu on the Observer machine. ... This window will now vanish. Next go to the CIMA main menu window, seen on the left of the screenshot above.Before starting observing, it is a good idea to restart the WAPPs (the spectrometers used by AGES). ... From the main menu, select Command File Observing to bring up the Command file observing window (below). ... Hit the Run button at the bottom of the command file observing window to run the file. ...

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• ABPP GUI notes
• datataking_software
• Useful Stuff

... To be read in conjunction with Section 4.11 of the WFPC2 Instrument Handbook , -Version 4.0. ... 1 The second study found evidence that CTE loss for faint stars has increased with time (Whitmore, 1998). The primary observational consequence of CTE loss is that a point source at the top of the chip appears to be fainter than if observed at the bottom of the chip, due to the loss of electrons as the star is read out down the chip (see Figure 1 ). ... Last updated: 06/16/98 10:38:00 . ...

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• HST Observer Monthly
• Processing of Observed Data

Fata Morgana: A Possibly Titanic Mirage . ... The optical phenomenon called Fata Morgana can make strange shapes or a false wall of water appear above a watery horizon. ... A conceptually comparable mirage can make a setting Sun appear strangely distorted or a distant pavement appear wet . One hundred years ago today, such a Fata Morgana mirage might have obscured real icebergs from the clear view of crew onboard the Titanic . ... NASA Web Site Statements, Warnings, and Disclaimers . ...

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• Fata Morgana: A Possibly Titanic Mirage
• XWare > APOD

home publications > mercury . ... Astronomy Beat . ... Nearly four centuries ago, Galileo's simple observations of Earth's planetary sibling, Venus, buoyed the proponents of a Copernican universe. ... The Italian astronomer had settled into a new house in Florence and had begun to observe Venus, which in November 1610 would have appeared as an evening star, bright in the western sky after dusk. ... From these two observations, Galileo inferred that Venus must orbit closer to the Sun than does Earth. ...

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• ASP: Using Multicultural Dimensions to Teach Astronomy
• ASP: Observer's Delight

... 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...

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• APOD: 2012 April 15 - Fata Morgana: A Possibly Titanic Mirage
• APOD: 2006 March 6 - Unexpected Comet Pojmanski Now Visible
• APOD: 2016 January 11 - A Colorful Solar Corona over the Himalayas

... Data Reduction FAQ > The reduced science spectrum displayed in the Reflex window appears good but when I try to plot it, it is quite different. How can I get it? ... Observing with ESO Telescopes . ... ESO-MIDAS . ... Reflex . ... ESO Data . ... ESO HST Image Galleries . ... ESO Data Access Policy . ... ESO Science Newsletter . ... ESO Annual Reports . ... Seminars at ESO Santiago . ... Seminars at ESO Garching . ... ESO Telescope Bibliography . ... Last Update: 01.04.14 ESO . ...

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• The Attic - Observing at airmass 4
• ESO - While using Reflex I cannot see a spectrum in any of the three windows
• Help for Night Report / Progress Pages

... 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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• lbaops:lbasep2014:v490ccdlog [ATNF VLBI Wiki]
• lbaops:lbasep2014:v527bcdlog [ATNF VLBI Wiki]
• lbaops:lbasep2014:v521acdlog [ATNF VLBI Wiki]

... Tonight's Sky . ... Sky this Month . ... Star Atlas . ... stars . ... The Sky This Week: April 1 - 10 . ... Observing springtime deep-sky objects with a large telescope . ... Why do some stars appear to flash a variety of different colors when you look at them through a telescope? ... So, Earthт??s atmosphere will bend some colors from especially bright stars more so than others, which makes the source look like itт??s flashing colors. Get instant access to subscriber content on Astronomy.com! ...

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

... Armagh Observatory, College Hill, Armagh BT61 9DG, +44 (0)28 3752 2928 . ... Most of the Abstracts and Full Papers that appear here are in Postscript Format . ... 332 Variation of Leonid Maximum times with location of observer . ... 34, 975-978 (1999) . ... Full Paper . ... 327 Modelling of Explosive Events in the Solar Transition Region: Importence of Radiative Losses and Thermal Conduction . I. Roussev, R. Erd lyi, J.G. Doyle and K. Galsgaard . ... L. Teriaca, D. Banerjee and J.G. Doyle . ...

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• Bright fireball seen over Ireland | International Year of Astronomy in Ireland
• Terry Mosely's Bulletins

... Here some data observed on the 6m telescope with IFP installed in the OLD focal reducer are presented. ... Mkn 3: velocity field . ... NGC 5252: [OIII] image . ... NGC 5252 was observed 23 Feb. 1998 in the [OIII]5007 emission line with CCD TK1024 as detector. ... We observed the ionized gas velocity fields of the spiral galaxies with two purpose. ... Restored velocity field of NGC 157 in the reference frame rotating with the pattern speed overlaid on the Ha image of the galaxy . ... NGC 4100 . ...

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• Emission molecular bands
• INASAN preprint: A method of the reconstruction of 3D velocity field of gas in
• Search for distant radio galaxies in SAO

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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• Where and When to See Comet PANSTARRS | Astronotes
• observing | Astronotes - Part 8
• Aldebaran: Red Giant at the Eye of the Bull | Astronotes

In 2001, Westerbork observations of the disturbed galaxy named VV-29 (alias Arp-188, UGC-10214) showed that there is second smaller galaxy (named VV-29c) that appears behind the western side of the main body of the distorted galaxy. ... The galaxy was featured as the May 2, 2002 Astronomy Picture of the Day . ... When VV-29 had its 15 minutes of fame in May 2002, it appeared under the name "The Tadpole Galaxy," but based on the images above, we will always think of it as "The CHAINSAW"! ...

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• Siding Spring Survey Follow-up Obs
• What’s this got to do with velocities?
• Melted remains of Cassegrain spectrograph are on the remains of the observing

... a greenish glow is often seen in the sky, known as the "Northern Lights." ... During magnetic storms, the glow may move southwards, and on occasion it can be seen in much of the US. ... A similar phenomenon is also seen in southern polar regions. ... Auroral light is produced at a height of about 100 km (60 miles) when fast electrons, arriving from space, slam into atoms and molecules of the atmosphere. ... The green light of the aurora puzzled scientists for many years, since it fit no known...

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• A Brief History of Magnetospheric Physics Before the Spaceflight Era
• Discovery of the Sunspot Cycle
• Black aurora [Oulu]

. Bishop School . Gallery of Activities . in Action .

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• X--ray Quiet PMS Candidates
• *counts_plot* - Inspection of Results
• ChaMPlane data_archive_.html

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• XMM RM in L-LocalTime
• XMM-Newton SAS: documentation
• XMM-Newton OM Response Files Page

. Weather Conditions . 3.5-m Observing and Staff Schedules . 3.5-m Night Logs . 3.5-m User's Mail Servers . Closure Policy . IAU Circulars (restricted to APO) . Catalog of UV and Optical Standards . Observing On-Site . Other Sources of Information . Staff Directory . Sky Calendar . Return to the APO Home Page

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• ARC Projects
• Information for On-Site Observers
• ARCSAT Observers Nightlog Form