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Topic: Photometry (astronomy)

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In the News (Mon 15 Jul 19)

  Photometry (astronomy) - Wikipedia, the free encyclopedia
Photometry is a technique of astronomy concerned with measuring the flux, or intensity of an astronomical object's electromagnetic radiation.
Historically photometry was done with a photoelectric photometer, an instrument that measured the light intensity of a single object by directing its light on to a photosensitive cell.
Photometry is generally used to generate light curves of objects such as variable stars and supernova where the quantity of interest is the variation of total light energy output over time.
en.wikipedia.org /wiki/Photometry_(astronomy)   (334 words)

 GGCs database: bibliography   (Site not responding. Last check: 2007-11-03)
Multicolor NTT Photometry of the Anomalous Globular Cluster NGC 288
BVR CCD photometry of the globular cluster NGC 1261
BV CCD photometry of the low-latitude globular cluster NGC 5946
www.mporzio.astro.it /~marco/gc/biblio.php   (3052 words)

 Astronomical Photometry
Photometry, the measurement of light flux, is one of the most fundamental and oldest research techniques employed in astronomy.
It begins with an overview of photometry and its history, followed by an explanation of photometric systems and how they are defined.
In addition to writing a book on the subject Astronomical Photometry and described in the photoelectric photometry section of this catalog) the authors have written a professional level computer program based upon the techniques described in their book.
www.willbell.com /photo/photo4.htm   (508 words)

 Zoom Astronomy Glossary: P
Photometry is the measurement of apparent magnitudes of astronomical objects, like stars.
Planetology is a branch of astronomy that studies planets.
If the astronomy term you are looking for is not in the dictionary, please e-mail us.
www.enchantedlearning.com /subjects/astronomy/glossary/indexp.shtml   (4166 words)

 photometry - HighBeam Encyclopedia   (Site not responding. Last check: 2007-11-03)
PHOTOMETRY [photometry], branch of physics dealing with the measurement of the intensity of a source of light, such as an electric lamp, and with the intensity of light such a source may cast on a surface area.
Other quantities of importance in photometry include luminous flux, surface brightness (for a diffuse rather than point source), and surface illumination.
In the Lummer-Brodhun photometer, an opaque screen is placed between the two sources, and a comparison is made possible by an ingenious arrangement of prisms.
www.encyclopedia.com /doc/1E1-photomet.html   (773 words)

 F&M | Astronomy   (Site not responding. Last check: 2007-11-03)
His Teaching Philosophy has developed from the courses he has taught at F&M and is the basis for the textbooks he has authored.
Dana Backman - infrared astronomy related to dust disks around stars and the formation of planetary systems, using data from Earth-based observatories and from orbiting space telescopes.
Elizabeth Praton - large scale structure of the universe, distortions in maps of galaxy distributions caused by velocity flows.
server1.fandm.edu /departments/Astronomy/Staff/staff.html   (120 words)

 CCD Photometry of Comets
While they were becoming an important factor in professional astronomy during the 1980s, it was not until the 1990s that CCD cameras became mass-produced at a rate inexpensive enough for amateur astronomers to be able to easily take advantage of.
Furthermore, many professional astronomers who concentrate on cometary photometry tend to use small 'diaphram' sizes to obtain the brightness of only the inner coma [e.g., Jewitt 1991] --- and indeed with large coma diameters, it may be impossible to integrate the entire brightness with a telescopic CCD camera.
In CCD photometry, the information on the radius to which the coma brightness was integrated is of the same importance as the derived value of the magnitude itself.
cfa-www.harvard.edu /icq/CCDmags.html   (7641 words)

 Category Astronomy - the free encyclopedia   (Site not responding. Last check: 2007-11-03)
Astronomy is a science involving the observation and explanation of events occurring outsideEarth and its atmosphere.
It studies the origins, evolution, physical and chemical properties of objects that can be observedin the sky (and are outside the earth), as well as the processes involving them.
For more information, see the main article about Astronomy.
www.free-web-encyclopedia.com /default.asp?t=Category:Astronomy   (54 words)

 ASTR 511, O'CONNELL. [Fall 2003] Lecture Notes
Film was the detector of choice for almost all applications in astronomy from around 1900 to 1960 and for imaging until about 1980.
Although PMT's were initially operated in a "direct current" mode, the pulse-like character of PMT output led to the adoption in astronomy of the same kinds of high speed digital electronics that had been developed earlier for accelerator and nuclear physics.
The central useful property of semiconductors employed in astronomy is that their electrical properties change significantly after absorption of photons.
www.astro.virginia.edu /class/oconnell/astr511/lec11-f03.html   (4831 words)

 Photoelectric Astronomy
This makes it suitable for photometry where by using filters astronomers can measure the flux of a star at specific wavebands.
With careful use photomultipliers can achieve photometric accuracy of about 1% (a difference of 0.01 magnitudes) but they are prone to interference from electric and magnetic fields and cosmic rays.
The study of neutrinos and high-energy cosmic rays are examples of particle astrophysics, a branch of astronomy that is not reliant on electromagnetic radiation from the source.
outreach.atnf.csiro.au /education/senior/astrophysics/photometry_photoelectricastro.html   (2249 words)

 AstroMB: Computer Aided Astronomy
There are 2 methods for the photometry: the PSF photometry allows the quick analysis of an image.
The aperture photometry is for very precise magnitude measurements.
An aperture is made of an inner circle for the object to be measured and of an outer ring for the background; the apertures are also saved into the database, ready to be reused.
astrosurf.com /astromb/wb_phmet.htm   (572 words)

 AAVSO: Photoelectric Photometry Newsletter Volume 23, No. 1
One way to demonstrate Janet's impact on astronomy is to compare the AAVSO at the beginning and the end of her career.
She was equally at ease with senior NASA administrators, leading astronomy researchers, amateur astronomers, teachers, and students.
The project used on-line photoelectric photometry of R CrB itself, by Don Fernie (University of Toronto), and photoelectric photometry of several southern R CrB stars, kindly provided by Professor Peter Cottrell (Canterbury University, Christchurch, New Zealand).
www.aavso.org /observing/programs/pep/pepnewsletter/aug04.shtml   (7087 words)

 ASP History Program 1994
This paper will review the development of photoelectric photometry during the half century prior to the introduction of the photomultiplier, when simple diode photocells were employed.
Nevertheless, photoelectric photometry was throughout this period the preserve of a few highly skilled observers.
Edlén is especially remembered by astronomers for his identification of the spectral lines in the solar corona as arising from forbidden transitions in highly ionized ions of iron and nickel.
www.phys-astro.sonoma.edu /people/faculty/tenn/asphistory/1994.html   (2126 words)

 Physics & Astronomy
Often, the larger goal is to understand the history and evolution of the larger system in which stars and clusters are found, the Milky Way Galaxy.
Our stellar astronomy group at KU has pioneered intermediate-band CCD photometry, has developed a successful new photometric metallicity index, and has uncovered a unique view of th-e spatial pattern of chemical composition in the disk of the Milky Way.
Through my activities with physics and astronomy students, I have instituted and participated in a tradition of public education in the greater Lawrence community.
www.physics.ku.edu /vita/anthony.shtml   (343 words)

 SOFA - Standard Object For Astronomy - Home
related to observational or theoretical astronomy data bases are listed.
The needs here are for stars with well known diameters or unresolvable objects for calibration purposes...
photometry of 51 early-type galaxies and 5 globular clusters
edradour.astro.utoledo.edu /cgi-bin/wrap/anatoly/SOFA   (863 words)

 Radiometry and photometry in astronomy
Photometry is the measurement of the intensity of electromagnetic radiation in photometric units, like lumes/lux/etc, or magnitudes.
Lux/lumens/etc uses the standard response curve for the eye, while astronomical photometry uses standard filters, with standard spectral response curves, e.g.
In Radio Astronomy, the unit Jansky is often used as a measure of irradiance at a specific wavelength, and is the radio astronomer's equivalence to stellar magnitudes.
www.stjarnhimlen.se /comp/radfaq.html   (6395 words)

 Harlow Shapley Visiting Lectureships
HARRY J., Professor of Physics and Astronomy, Widener University, Chester, PA - stellar evolution, planetary nebulae, galactic structure, CCD photometry, astronomy education.
JAY M., Field Memorial Professor of Astronomy and Director of Hopkins Observatory, Williams College, Williamstown, MA - HST, the sun and solar eclipses, space observations of the planets, origin and future of the universe, the deaths of stars, transit of Venus.
JOHN H., Professor of Mechanics & Aerospace Science & Astronomy, University of Rochester, Rochester, NY - solar astrophysics, solar activity, solar and stellar seismology, astrophysical fluid dynamics, stellar pulsations, solar and stellar dynamos.
www.union.edu /orgs/shapley/lecturer.htm   (2339 words)

 Refereed Astronomy Publications
Fekel, F. and Henry, G. W., "Spectroscopy and Photometry of the Double-Lined Binary HD 149420," Astronomical Journal, 131,1724, 2006.
Aarum Ulvas, V. and Henry, G. W., "BV Photometry of UX Ari in the Period 1987 - 2002," Astronomy & Astrophysics 402, 1033, 2003.
Percy, J. R., Bakos, A. G., and Henry, G. W.,"Long-Term VRI Photometry of 89 (V441) Her," Publications of the Astronomical Society of the Pacific 112, 840, 2000.
schwab.tsuniv.edu /refereed.html   (5597 words)

 Astronomy (observing) - Cambridge University Press
Review of astronomical photometry for graduate students, researchers and advanced amateurs in practical and observational astronomy.
Describes the theory and uses of interferometry for advanced students in physics, optics and astronomy.
It is timely, focused, well written, and at the appropriate level … Astronomy Methods will be useful to all students of astronomy and astrophysics, irrespective of whether they intend to specialize in observational astronomy.
www.cambridge.org /uk/browse/default.asp?subjectID=343   (344 words)

Making precise and accurate photometric measurements with a CCD camera is challenging aspect of the hobby for an amateur and using a webcam instead of a commercial CCD astrocamera brings its own additional problems.
As a beginner in photometry I have a lot to learn and I am also finding out more about the characteristics of my webcam based camera.
I have discovered though that it is possible to overcome the limitations of the webcam and make useful observations.
mysite.wanadoo-members.co.uk /astro2/Photometry.htm   (278 words)

 PHYS 151: Observational Astronomy
The photometry must be correctly reduced and given in a three-column table, listing Julian Date (not heliocentrically corrected), V-C magnitudes, and C-K magnitudes.
Eight hours of time-resolved, differential photometry, either of V378 Peg or V825 Her, or other objects.
Sixteen hours will count as two projects, etc. This photometry must be correctly reduced and given in a three-column table, listing Julian Date (not heliocentrically corrected), V-C magnitudes, and C-K magnitudes.
zimmer.csufresno.edu /~fringwal/phys175tobs.html   (2342 words)

 [No title]   (Site not responding. Last check: 2007-11-03)
Jetsu 1993: ``A decade of photometry of LQ Hydrae'' Astronomy and Astrophysics 276, 345-352
Jetsu 1996: ``The active longitudes of Lambda Andromedae, Sigma Geminorum, II Pegasi and V711 Tauri'', Astronomy and Astrophysics 314, 153-164
1997: ``Is the longitudinal distribution of solar flares nonuniform?'', Astronomy and Astrophysics 318, 293-307
www.astro.helsinki.fi /~jetsu/projects.html   (417 words)

I became interested in astronomy and telescopes when I was 8 years old.
Most of this time was spent taking data for various astronomy research projects, or installing/testing/optimizing instruments, or experimenting with data-acquisition/processing/analysis techniques.
I have written programs to scan the devices; download the data to computers; process the raw signal to remove dark-noise, fixed-pattern noise, scaling errors and other identifiable aspects of the sensor and experimental instrumentation; merge or assemble images; identify, compare and catalog objects; auto-track objects; display/print images and statistical results; etc.
www.maxreason.com /astronomy/astronomy.html   (2364 words)

 UCL Astronomy Undergraduate Field Trip 2005: Photometry Report   (Site not responding. Last check: 2007-11-03)
The report on "Imaging Photometry of a Pulsating Variable" is the second of three reports which all students taking part in the Field Trip should submit.
This report should be submitted by the end of the first week of the Third Term.
The photometry report must be submitted separately from the report on spectroscopy.
www.ulo.ucl.ac.uk /students/3c32/2005/photometry.html   (435 words)

 AAVSO: Gamma Cassiopeiae, October 2001 Variable Star Of The Month
The star is in both the AAVSO visual and the photoelectric photometry (PEP) programs, however, photoelectric photometry is recommended.
An international long-term UBV photometry "campaign" on bright Be stars was established in 1980 by Petr Harmanec and some of his colleagues at the Ondrejov Observatory, Czech Academy of Sciences.
Hipparcos epoch photometry (1989-1993) has also been very useful in understanding the diverse behavior of a large sample of Be stars (Hubert & Floquet 1998).
www.aavso.org /vstar/vsotm/1001.stm   (2125 words)

 ASTR 2513 and photometry book   (Site not responding. Last check: 2007-11-03)
Each fall semester, I teach a course for astrophysics and astronomy majors, ASTR 2513, titled "Observatory Methods".
This course covers basic material about telescopes and detectors for optical astronomy, with most of the course devoted to learning about CCD detectors and learning how to use these wonderful devices to make broadband (BVR) optical photometric measurements of astronomical sources.
The latest version of the book, titled "An Introduction to Astronomical Photometry Using CCDs" can be downloaded in PDF format from here.
observatory.ou.edu /book2513.html   (371 words)

 BGSU Variable Star Project
Photometry and variable star search in globular cluster NGC 6637 (M69).
Astronomy Major at Univ. of Michigan (Y.O.G. Photometry and variable star search in globular cluster NGC 6316.
Astronomy Major at Univ. of Michigan (Y.O.G. Photometry and variable star search in globular cluster NGC 6441.
physics.bgsu.edu /~layden/VarStarProj/People/vsp_people.htm   (755 words)

 Amateur CCD Astronomy
The CCD affords amazing views of the night sky even for amateur astronomers with modest telescopes living in large light-polluted metropolitan areas.
The CCD also permits precise astrometry, spectroscopy, photometry, and other types of scientific research for even amateur astronomers.
Of course, the CCD can be used to obtain beautiful and interesting astrophotography.
www.azastronomy.com   (162 words)

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