... Comet Ikeya Zhang Brightens . ... Credit: Gerald Rhemann Explanation: In the last week , Comet Ikeya-Zhang has become bright enough to be just visible to the unaided eye. Based on its present activity, observers are optimistic that Ikeya-Zhang will become substantially brighter. ... Публикации с ключевыми словами: comet - comet Ikeya-Zhang - кометы - комета Икея-Жанга . Публикации со словами: comet - comet Ikeya-Zhang - кометы - комета Икея-Жанга . ... Комета Холмса над Венгрией . ...

Once students get the hang of it, they can find and measure the brightness of Delta Cephei in a few minutes. ... of Delta Cephei . ... Oct. ... The following table lists the measurements of Delta Cephei made by one amateur astronomer in autumn 1990. ... 4.0 . ... This activity is a simplified version of one that appeared in Hands-On Astrophysics, a series of activities prepared by the American Association of Variable Star Observers with support from the National Science Foundation. << previous page | ...

AGN dust model of 3CR sources Frank Heymann (PhD), Martin Haas, Endrik Krgel, Christian Leipski MIR imaging spectroscopy ISM dust model PAH SED of a clumpy AGN torus CenA (ESO) Crete 2010 vectorized Monte Carlo model Ralf Siebenmorgen 1) Ground based MIR imaging Nuclear activity in nearby galaxies Surface brightness AGN viz. starbursts Ralf Siebenmorgen 10m telescopes ... Ralf Siebenmorgen Crete 2010 PAH in a mono-energetic heating bath if | ... Crete 2010 ...

... The Galactic low-mass X-ray binary GS 2023+338 was discovered during the burst on May 22, 1989 with the Japanise satellite Ginga (aka Galaxy). The flux reached 17 crabs (this unit of flux measurement is an bright X-ray source, Crab Nebula) at 10-35 keV. ... No other radio telescope worldwide carried out multi-frequency measurements. ... Upon 14 days the radio flux fell below the detection level at the RATAN-600 in relation to the decrease of the X-ray flux. ...

... In collaborative work with David Garc?a Alvarez (an Observatory PhD student now at Harvard) and John Butler, an extensive study of the RS CVn binary HR1099 was completed leading to two papers; the first on Doppler imaging and the second on flare activity. Spectra for the Doppler imaging were taken at two different sites, Kitt Peak National Observatory (KPNO), Arizona, and Mount Stromlo Observatory (MSO), Australia, during the 1998 MUltiSIte COntinuous Spectroscopic (MUSICOS) campaign. ...

... The earliest X--ray observations were carried out in the mid--1970s. X--ray luminosities of order L erg/sec were detected in the 2-11 keV range in the direction of the Orion star forming region. ... These observations showed that the O and B stars were the brightest X--ray sources, and that TTs were also associated with emission. Feigelson and Kriss (1981) showed that some of the X--ray sources were associated with PMS stars which had not been previously detected which H surveys. ...

... It is found that the correlation coefficients between these two parameters calculated separately inside and outside the sunspot formation zone ±30 have cyclic variation and occur in anti-phase. This suggests different mechanisms of formation of the corona in the fields of small, medium, and large scales. ... The relationship between the coronal green line brightness (CGLB) and the magnetic field strength (MFS) has been investigated by constructing the corresponding synoptic maps for the 1977-2001. ...

... POLAR/VIS EC . ... Kiruna Magnetometer . ... HLMS VHF Auroral Radar . Active aurora should produce a bright ring around the magnetic pole in the POLAR image (note: the UVI field-of-view is smaller than the planetary disk.) ... Auroral activity near Kiruna, Sweden will produce deflections on the magnetometer trace -- significant activity gets up to several hundred nT of deflection. ... The VIS is one of twelve instruments on the Polar satellite of the NASA Goddard Space Flight Center. ...

. Next: About this document ... Up: Part IV Extragalactic Astronomy Previous: Magnitudes . Sky brightnesses in magnitudes per square arcsecond. This data is from Siding Spring observatory - other observatories will be comparable or worse. U . B . V . R . I . J . H . K . Kn . Dark Sky . 22.8 . 22.5 . 21.5 . 20.8 . 19.3 . 6-day Moon ... 21.3 . 20.8 . 20.4 . 19.2 . Full Moon ... 18.8 . 18.5 . 18.9 . 18.2 . 15.0 . 13.7 . 12.5 . 13.7 . Paul Francis . 1999-03-09

Next: Tsys scaling Up: Calibration Previous: Calibration . RPFITS files to not contain any information as to whether the telescope calibration was in units of Kelvin or Janskys. On reading the data a default value is set depending on the telescope and frequency of observation. ... ASAP> scans = scantable(('2004-11-23_1841-P484.rpf', unit='Jy') # Or in two steps ASAP> scans = scantable(('2004-11-23_1841-P484.rpf') ASAP> scans.set_fluxunit('Jy) . ...

. The bright arcs, superimposed on images of Earth, reveal low-energy X rays generated during auroral activity. The maximum brightness appears in red. NASA / MSFC / CXC; Earth model: NASA / GSFC

You Can Make Stellar Images Brighter . Articles | ... A few months ago I wrote an article titled "You Can’t Make Them Brighter". So why am I now writing that you can make them brighter. ... The image of a focused star is actually a small disk called the Airy disk, named after the 19 th century scientist Sir George Airy. ... For a given aperture, a smaller Airy disk means that the light is focused to a smaller disk and is therefore brighter. ... www.astronomy.net . About Astronomy Net | ...

... The main field of my investigations is stellar spectrophotometry. As a result of scientific activity of our group spectrophotometric catalog was created including energy distribution data on 900 stars in the range 3200-7600AA and 250 stars in the range 6000-10800AA (Voloshina et al., Spectrophotometry of Bright Stars, ed. I.N.Glushneva, 1982, Moscow, Nauka, in Russian). ...

... Развивающая игрушка Лягушка Bright Starts привлечет ребенка красочным видом, подарит новые ощущения и вскоре станет любимой игрушкой, приятной и веселой. ... Цвет: розовый . ... Цвет: Коричневый . ... Цвет: натуральный . ... Кружка имеет силиконовую крышку оранжевого цвета с прорезью для питья. ... Цвет: синий . ...

... Dept. for Astrometry & Space Geodynamics . ... Dept. for Physics of Stars&Galaxies . ... Dept. for Physics of Planetary Systems . ... Science . ... All Pages . ... Research of the stars with planets which pass apparent star disk (transiting exoplanets). The transit method based on a detection star brightness decrease during a passing of planet in front of its disk. Observed brightness system decries when planet pass star disk and its volume depend of the relative sizes star and planet. ...

Microsymposium 38, MS083, 2003 (A4 format) MERCURY: LOCAL VARIATIONS OF THE PHOTOMETRIC RELIEF. ... Because of trajectory and pointing angle constraints the planet could be observed from Mariner 10 only over a small range of phase angles between about 75o and 110o. Therefore the photometric investigations are restricted to measuring the distribution of brightness on the Mercurian disk. ... Raw versions of real-time processing pictures FDS 0000984 and FDS 0000986 were used (images 196 and 202). ...

... Астрософт (Модератор: tlgleonid ) > . UCAC2 Bright Star Supplement для Cartes du Ciel . ... Астрософт . ... Cartes du Ciel - Sky Charts . ... 08 Август 2008, 14:04:19 ? Также готов каталог I/294 The UCAC2 Bright Star Supplement (Urban+, 2004), являющийся северным дополнением к каталогу I/289 The UCAC2 Catalogue(Zacharias+ 2003). ... Ответ #1 : 08 Август 2008, 14:41:20 ? ... Самая слабая звезда в каталоге UCAC2 Bright Star Supplement - это 2UCA 50406212 Vmag: 15.19 в Малой Медведице. ...

Oberon . Uranus IV . Oberon [O-buh-ron] is a moon of Uranus that is characterized by an old, heavily cratered, and icy surface. The surface shows little evidence of internal activity other than some unknown dark material that apparently covers the floors of many craters. The above image shows several large impact craters towards the center of the image. ... This image of Oberon shows several large impact craters towards the center of the picture. ... Polar Stereographic Map of Oberon . ...

... Since moonshine is really reflected sunlight, the full Moon is on the average slightly brighter in mid-winter, when Earth is closest to the Sun. In addition, the distance of the full Moon also varies, due to the ellipticity ("eccentricity") of the Moon's orbit. On 22 December, 1999, the two effects combined to produce the brightest full Moon of the century. ... This year will be the first full moon to occur on the winter solstice, Dec. 22nd, commonly called the first day of winter. ...

... Luminosity (L) · · · · A source's luminosity is the power that it emits in radiation. ... NB Astronomers often say `flux' when they mean `flux density' · SI units are Wm-2Hz -1 -26 filter · Also used are Jy 10 Wm-2Hz -1 E= РРРF d dA dt Specific Intensity, Surface Brightness (I) · Specific intensity (or surface brightness) is the power received (or emitted) per unit area per unit frequency per unit solid angle. ч F at surface of a spherical source = I · · Specific intensity is independent of distance...