• Instead we wish to discuss a relatively new technique for observing variable stars that appears to be a middle-grounds in terms of ease and precision: DSLR photometry. (aavso.org)
  • Unlike single-channel and CCD photometry which require expensive sensors and specialized astronomical filter sets (more on these later), DSLR photometry can produce high quality data in a fairly short period of time at modest cost. (aavso.org)
  • The DSLR Documentation and Reduction Team has created a series of tutorials to guide you through setting up your camera, imaging target and comparison stars, processing your data and submitting the results to the American Association of Variable Star Observers (AAVSO). (aavso.org)
  • We first introduce you to the broad concepts of how DSLR photometry works and what you will need if you decide to do it on your own. (aavso.org)
  • A novel method of digital single lens reflex (DSLR) photometry is described. (aaq.org.au)
  • DSLR photometry in white light is a valid procedure, at least in those cases where the color indices of the variable and comparison stars differ by only small values. (aaq.org.au)
  • Today I submitted an August 22 DSLR observation of the long period eclipsing variable BL Tel to the AAVSO international database. (strangequark.me)
  • Adrian Lucy (graduate student, Columbia University) have requested AAVSO observations in support of a search underway by Mx. (aavso.org)
  • From this page, you can find information about obtaining AAVSO data, requesting new observations, or learning more about the AAVSO, its data, and its services for the research community. (aavso.org)
  • Let's say that you've written a program in Python to do computational work for your observations, and it takes in data from the AAVSO Target Tool as input. (aavso.org)
  • The darker the skies, the more precise our measurements will be for astronomical observations in photometry. (alsadeemastronomy.ae)
  • AAVSO Variable star observations. (indilib.org)
  • These can be visual observations all the way to modern digital photometry. (bpastro.org)
  • We use seven daily observations in the X-ray and UV by the Swift satellite, together with AAVSO V photometry, to characterise the outburst and decline behaviour. (le.ac.uk)
  • The range of VV Cep is given in VSX as 4.88 - 5.40 V. Observations in the AAVSO International Database show that, out of eclipse, VV Cep varies between 4.91 V and 5.2-5.3 V. In V, the eclipse may be slightly under a magnitude in depth. (astroimagingsouthwest.com)
  • Submit observations: Please submit observations to the AAVSO International Database using the name VV CEP. (astroimagingsouthwest.com)
  • Following a request by E. O. Waagen to AAVSO members, several observers have sent their confirming observations. (harvard.edu)
  • Dr. Nicolas Grosso (CNRS, Observatoire Astronomique de Strasbourg) has requested AAVSO assistance in monitoring the young eruptive star (FUOR type) V2492 Cyg from the optical to the infrared in support of X-ray observations with XMM-Newton scheduled for 2017 April 18 UT. (hkas.org.hk)
  • AAVSO observations indicate that V2492 Cyg, which has been declining from outburst, appears to be rebrightening, so nightly observations beginning immediately are critical. (hkas.org.hk)
  • To support the XMM observations, beginning now and continuing through April 30 , observers are requested to obtain 'simultaneous optical to infrared photometry (BVRIJHK and/or the equivalent Sloan filter) in order to monitor the behaviour of the extinction and accretion, and to compare it with the level of X-ray emission that will be observed with XMM-Newton. (hkas.org.hk)
  • This study makes use of optical photometry, infrared photometry, and both high- and low- resolution optical spectroscopy for stars spanning a dynamic range in apparent magnitude of ~20 mag. (noirlab.edu)
  • 2017). The search uses catalog photometry from the KELT-N & S telescopes and provides a cross match to both the TESS Input Catalog (Stassun et al 2017) and the AAVSO Variable Star Index (Watson et al. (filtergraph.com)
  • August 16, 2017: The AAVSO is requesting monitoring of the eclipse of the very bright Algol-type eclipsing binary variable VV Cep, predicted to have begun in June 2017 and to conclude in November 2019. (astroimagingsouthwest.com)
  • Steve O'Connor (AAVSO member) observed V=14.27 on 2017 March 26 confirming it. (hkas.org.hk)
  • The technique of surface photometry can also be used with extended objects like planets, comets, nebulae or galaxies that measures the apparent magnitude in terms of magnitudes per square arcsecond. (wikipedia.org)
  • The V50 photometry database has like the D50 a 5000 stars per square degree density except the magnitude is the calculated Johnson-V and it also contains the Gaia Bp-Rp magnitude difference. (hnsky.org)
  • The V05 photometry database is like the G05 except the magnitude is the calculated Johnson-V and it also contains the Gaia Bp-Rp magnitude difference. (hnsky.org)
  • By crossmatching IPHAS against the AAVSO Photometric All-Sky Survey (APASS), I derive transformations between the two photometric systems, and measure the per-IPHAS- field magnitude shifts needed to bring the two surveys in line before a global calibration can be applied. (herts.ac.uk)
  • I would like to share a small program I wrote, currently called MetroPSF for the lack of better name, for differential ensemble PSF-fitting photometry. (aavso.org)
  • Photometry is also used in the observation of variable stars, by various techniques such as, differential photometry that simultaneously measures the brightness of a target object and nearby stars in the starfield or relative photometry by comparing the brightness of the target object to stars with known fixed magnitudes. (wikipedia.org)
  • This campaign is being followed on the Campaigns and Observation Reports Forum at https://www.aavso.org/vv-cep-observing-campaign . (astroimagingsouthwest.com)
  • I also make use of the 2003 Besan con model of Galactic population synthesis to generate catalogues of synthetic photometry along three sightlines in the IPHAS footprint in order to test different 3D extinction prescriptions. (herts.ac.uk)
  • The VizieR photometry tool allows for easy visualization of photometry points extracted around the Simbad position from photometry-enabled catalogues in VizieR. (unistra.fr)
  • Lark is currently researching exoplanets by doing photometry using the telescope at Peter's Observatory. (hamilton.edu)
  • We report here that our photometry, obtained during the decline from an outburst, shows slow flickering, with the optical and IR light curves correlated with no delay. (herts.ac.uk)
  • These answers to these simple questions can be obtained from just visual inspection of a light curve , or through more advanced techniques, but the main reason why we do photometry is to gain additional insight to the behavior of various astronomical objects. (aavso.org)
  • Photometry, from Greek photo- ("light") and -metry ("measure"), is a technique used in astronomy that is concerned with measuring the flux or intensity of light radiated by astronomical objects. (wikipedia.org)
  • This endeavor has been made official with the two observatory codes we received from the International Astronomical Union's Minor Planet Center (M43) and the American Association of Variable Star Observers or AAVSO (OAAA) in 2019. (alsadeemastronomy.ae)
  • Darwin G, Stebbins J. ( 1950 ) The Electrical Photometry of Stars and Nebulae Monthly Notices of the Royal Astronomical Society . (academictree.org)
  • and if you do photometry over time you can answer another fundamental question: "How does brightness change with time? (aavso.org)
  • This modified AAVSO chart is from the VV Cep brightness campaign being coordinated by Frank Walter of the BAV (Bundesdeutsche Arbeitsgemeinschaft für Veränderliche Sterne e.V.). The AAVSO has chosen to use these comparison stars for compatibility with the BAV campaign. (astroimagingsouthwest.com)
  • Created using the AAVSO light curve generator tool. (bpastro.org)
  • The light curve of this object obtained by the American Association of Variable Star Observers (AAVSO) (T. Chlebowski, personal communication) has shown it to be a dwarf nova with a recurrence time scale of 15 days. (herts.ac.uk)
  • Then we walk you through starting and finishing analysis and how and finally how to submit data to the AAVSO database for long-time archiving. (aavso.org)
  • For photometry you could download and install the V50 star database. (hnsky.org)
  • The AAVSOnet Epoch Photometry Database comprises robotically-processed photometry obtained from all images taken with AAVSOnet telescopes. (aavso.org)
  • A preliminary analysis of a photometry database spanning our first two years for about 10 million stars in the LMC and 12 million stars in the bulge has been been completed. (noirlab.edu)
  • The campaign to monitor activity of the peculiar cataclysmic variable FS Aurigae, as announced in AAVSO Alert Notice 428 (see also AAVSO Special Notice #226 ), continues. (aavso.org)
  • He is also the section leader for Short Period Pulsating Stars at the American Association of Variable Star Observers (AAVSO). (bpastro.org)
  • the binary eclipses are also readily seen in the archival photometry from ASAS-SN and ATLAS. (nasa.gov)
  • The TESS photometry of TIC 298714297 also shows a clear rotational signal with a periodicity comparable to the orbital period of the inner binary. (nasa.gov)
  • MetroPSF can now generate AAVSO-compatible report files. (aavso.org)
  • Much more precise photometry, as you can set it up to automatically exclude comparison stars farther than R arcseconds from the target, or that are not fitting well into the comparison ensemble, e.g. limit ensemble to N stars. (aavso.org)
  • See the gray boxes on the right hand side of this page to access the AAVSO data archives or to find out how to work with the AAVSO to obtain new scientific data. (aavso.org)
  • I currently workaround this problem by checking AAVSO for the most recent V mag data for a specific star, then using one of the above x second exposures which would be close to not saturating the star. (indilib.org)
  • The VVV survey will eventually deliver a deep near-IR atlas with photometry and positions in five passbands (ZYJHK S ) and a catalogue of 1-10 million variable point sources - mostly unknown - that require classifications. (uai.cl)
  • At its most basic, photometry is conducted by gathering light and passing it through specialized photometric optical bandpass filters, and then capturing and recording the light energy with a photosensitive instrument. (wikipedia.org)
  • Using multiple bandpass filters with relative photometry is termed absolute photometry. (wikipedia.org)
  • Multicolor photometry (V and Rc filters preferred) is requested beginning now and continuing for at least one month after the eclipse is over (late 2019). (astroimagingsouthwest.com)
  • Specifically, nightly snapshots in as many filters as possible are requested, with priority on BVRcIc filters, 5% photometry (transformed). (hkas.org.hk)
  • If you have questions as you go through this tutorial, please post them to the photometry forum as many of our team members regularly visit there. (aavso.org)
  • The AAVSO Target Tool API allows you to write programs that access the AAVSO Target Tool outside of the browser. (aavso.org)
  • The AAVSO Target Tool API will allow you to access targets and visibility information from the command line (outlined below). (aavso.org)
  • Photometry results were B=16.02, V=14.41 and Ic=11.77 with T72, iTelescope.NET (0.5m, F:6.8 CDK) at Deep Sky Chile at Rio Hurtado Valley, Chile. (harvard.edu)
  • he adds that 4 hr of V- and I-band photometry shows a strong superhump signal with peak-to-peak amplitude 0.2 mag, indicating that it is probably a SU UMa-type cataclysmic variable. (harvard.edu)
  • The AAVSO has already posted several documents discussing the importance of variable star work therefore we won't elaborate further here. (aavso.org)
  • 5 . In this work I make use of the opportunity that IPHAS photometry provides to create stellar number density maps of the Northern Galactic Plane. (herts.ac.uk)
  • This is similar to common aperture photometry algorithms found in other software except that a 2D model of the background is subtracted from the image, so sky annuli are not used. (aavso.org)