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 | ...

... About ATNF overview . ... Australia Telescope Steering Committee . ... Murchison Radio-astronomy Observatory . ... Parkes radio telescope . ... Australia Telescope 20GHz Survey . ... Bright prospects: Comparing the H Survey with large-scale radio continuum emission . ... Prospects for comparisons between the AAO/UKST H \ survey and large-scale radio continuum emission are considered, with particular reference to the recently completed Parkes 2.4-GHz survey of the southern Galactic Plane. ...

... The sample of the Local Volume galaxies (distance smaller than 10 Mpc) gives a unique opportunity to study the properties of galaxies including the weakest objects: the absolute magnitude M B -10 and the virial mass M vir 10 9 M x263C;. ... Luminosity function of the Local Volume galaxies. ... The luminosity functions for galaxies are presented: red dashed line - from the 2dFGRS survey (Norberg et al. 2002); blue dash-dotted line - from the SDSS survey (Blanton et al. ...

Star formation is often best manifested by bright H II regions.These are regions of hydrogen which have been ionized by ultraviolet photons which are emitted from massive stars (typically stars more than 20 times the mass of the Sun). ... A narrowband filter image centered on this wavelength will then readily reveal these H II regions and hence the current sites of star formation in a galaxy, The luminous blobs that can be seen here are all H II regions . ... NGC 3558 Visual . NGC 3558 Infrared . ...

GHRS Instrument Handbook 4.1 111 Index 112 GHRS Instrument Handbook 4.1 A Accumulation Mode 15, 20, 34, 43--45 CENSOR 45 details 88--89 COMB 16, 44 DOPPLER 45, 104--105 FP­SPLIT 16, 44 parameter summary 44 STEP­PATT 17, 44, 84 STEP­ TIME 45 substepping 20 acquisitions 17, 18, 25, 34, 34--41 ACQ/ PEAKUP , see acquisitions , ...

... 389Voges+ IX/10A ROSAT All-Sky Bright Source Catalogue (1RXS) (Voges+ 1999) ================================================================================ The ROSAT all-sky survey bright source catalogue. ... At a brightness limit of 0.1cts/s (8,547 sources) the catalogue represents a sky coverage of 92%. Broad band images are available for a subset of the flagged sources from http://wave.xray.mpe.mpg.de/rosat/catalogues/rass-bsc . ... 0 Source countrate (4) 70- 78 E9.3 ct/s e_Count ?= ...

... The 7 and 15 um observations of selected fields in the Galactic Plane obtained with ISOCAM during the ISOGAL program offer an unique possibility to search for previously unknown YSOs, undetected by IRAS because of lower sensitivity or confusion problems. ... The main indications of the previous analysis are confirmed, but the criteria for selecting YSO candidates had to be revised to select only bright objects, in order to limit the contamination of the sample by Post-MS stars. ...

... Henrietta Leavitt Calibrates the Stars . ... X Ray Moon . ... This x-ray image of the Moon was made by the orbiting ROSAT (R ntgensatellit) Observatory in 1990. ... SOHO, the space-based SOlar and Heliospheric Observatory, has become by far the reigning champion facility for discovering comets, its total having recently reached 200. ... Full Throttle For Deep Space 1 . ... The bright stars above are well known as heart of the Trapezium, an open cluster of stars in the center of the Orion Nebula. ...

... Three ` flavours'of binning and discard: · Discard 9 rows , readout 1 row, cut 10:1, resolution 1.75ms · Discard 90 rows , bin 10 rows , cut 10:1, resolution 2.76ms · Discard 95 rows , bin 5 rows , cut 20:1, resolution 2.76ms · Compared with normal timing : · 100 rows and readout, no cut, resolution 1.75ms Bin · Tested on XMM on Crab during rev 333 - 3 October 2001 Crab - rev 333 - Bright timing ... Counting mode and FIFO full errors. ... Crab - rev 333 - Bright timing mode ...

... In order to compare the number of different evolutionary stages obtained and X-ray luminosity of the chosen X-ray sources with the observed galactic values we use the sum of C/O+O/C , where C and O are the calculated and observed values of a given binary type, respectively. If we make comparison for a number of different binary species (for example, we compare the number of CV, number of X-ray pulsars,   total X-ray luminosity of LMXB, etc.), we write this criterion in the form: . ...

... The bright supernova (hereafter SN) in the galaxy NGC 4527 was first sighted by S. Knight (USA) on April 13.17UT at magnitude ~14.0v. The report of the sighting was subsequently forwarded by phone to the AAVSO. ... SN 1991T. The galaxy NGC 4527 is an Sb(s)II type galaxy with an apparent Blue magnitude of 11.32 (Shapley-Ames, 1981). ... An analysis of this event utilizing visual observations by amateurs, plus a light curve is presented.. ... THE LIGHT CURVE: . ... ISN SN 1991T web page . ...

Definitions of Magnitudes and Surface Brightness 1 The magnitude system 1.1 Apparent magnitude Astronomers are stuck with the antiquated old system of magnitudes and so a clear explanation of what this system is and how it relates to more sensible units is important. ... 1.2 Absolute magnitude Absolute magnitude is a logarithmic luminosity scale. ... One usually goes by the round about process of referring to the absolute magnitude of the sun. ... Magnitudes and surface brightness 6/6 ...

Sternberg Astronomical Institute, Moscow University, . Moscow, Russia . Supernovae make us brighter .. Search russian astronomical resources . Mirror of International Supernovae Network ( Original site ) . Catalogue of Supernovae Stars . HTTP access to SAI Catalogue of Supernovae Stars . SAI SN Light Curves Online . ... Sternberg Astronomical Institute ( in Russian ) . ... Astronet - Russian Astronomical Network . ... Russian Foundation for Basic Research . ...

New reduction of minor planets photographic plates obtained with Pulkovo Normal Astrograph A.A. Berezhnoy Pulkovo Observatory of RAS, Saint-Petersburg, Russia Minor Planet observations at Pulkovo Periodical observations of 14 bright asteroids named Selected Minor Planets (SMP) were performed at Pulkovo since 1948 within the international framework started by works of B.V. Numerov and D. Brouwer. ... 108 133 113 74 124 67 97 88 14 84 64 5 20 19 Epochs (YYYY.MM) 1200 Mean values of total obs. ...

... The hotter the gas, the faster they move, and the more energy each of them holds. The free ions and electrons in a plasma behave the same way. Knowing the temperature of the high atmosphere of Earth, or that of the Sun, we can calculate energies expected of ions and electrons found there. However, ions and electrons actually observed in space are often much , much more energetic, and may move at a respectable fraction of the velocity of light (300,000 km/sec or 186,000 miles/sec). ...

... 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. ...

NAUTICAL ASTRONOMICAL ALMANAC for 2005-2006 (in Russian) . ... The Institute of Applied Astronomy of the Russian Academy of Sciences submits the next issue of тАЬThe Nautical Astronomical Almanac for the years 2005-2006тАЭ (NAA-2) biennial. NAA-2 is based on тАЬ The Nautical Astronomical Yearbook тАЭ (NAY) also prepared by IAA RAS. ... The structure of тАЬThe Nautical Astronomical Almanac for the years 2005-2006тАЭ has not undergone essential changes in comparison with the previous issue of NAA-2. ...

... Mass . 17a. Measuring Mass . ... A medium-size (1.25 inch wide) binder clip, as is used in offices to hold papers together--the type made of flat blue steel, with two wire handles. ... The theory predicts that the oscillation period should be proportional to the square root of the oscillating mass, including the mass of the clip. Note that gravity plays no part here: the oscillation period would be the same on the Moon or in zero-g. Denoting square root by SQRT, we have . ...

. Image of the inner 3 square degrees of the NGFS survey footprint compared with the size of the Moon. Low surface brightness dwarf galaxies are marked by red circles. Gray circles indicate previously known dwarf galaxies. The dwarf galaxies, which vastly outnumber the bright galaxies, may be the missing satellites predicted by cosmological simulations. NOAO

... MOON OCCULTS PLEIADES, 23-24 FEBRUARY. ... known by different designations - don't worry if your PC programme or Atlas shows some of them with other Catalogue numbers STAR Mag Time V 624 Tau 8.2 E22.10 V 1187 Tau 8.3 E22.23 TYC 1803-188 E 8.1 E22.29 16 Tau 5.5 22.44 19 Tau 4.3 22.50 TYC 1799-306 E 8.5 E22.57 TYC 1803-104 E 8.9 E22.59 TYC 1799-184 E 7.2 E23.05 20 Tau 3.9 23.08 21 Tau 5.7 23.09 22 Tau 6.4 23.12 TYC 1804-2081 6.8 23.35 ... Clear Skies, Terry Moseley . ...