1,721,013 research outputs found
An automated Astrophysics lab for everybody: the activities of the Astronomical Observatory of the University of Siena during two years of Covid-19 pandemic
No full textIn 2009 Elisa, a student of Physics and Advanced Technologies, could not access the dome of the University of Siena Astronomical Observatory because she is forced on a wheelchair by disability. "Advanced technologies" helped her, though. Between 2010 and 2012 the Observatory instrumentation was completely updated, but, most importantly, was fully automated, and made remotely controllable trough an Internet connection
Si viaggia meglio in compagnia! La piccola luna dell'asteroide Balaton scoperta dal telescopio dell'Università di Siena
Full text linkNel dicembre 2015 il telescopio dell'Università di Siena stava osservando l'asteroide 2242 Balaton per determinarne il periodo di rotazione mediante studio fotometrico. Alcune anomalie registrate nelle prime sessioni hanno fatto supporre che l'asteroide potesse avere un satellite. La certezza è arrivata solo grazie ad altre osservazioni, un bel lavoro di squadra e una forte collaborazione internazionale, che hanno portato alla pubblicazione della CBET 4243: adesso sappiamo che l'asteroide 2242 Balaton, le cui dimensioni sono stimate in circa 6 km di diametro, ha un satellite, un piccola luna di circa 1.5 km che lo accompagna nel suo perenne viaggio intorno al Sole
Rotation Period Determination for Asteroid 3616 Glazunov
No full textPhotometric observations of the main-belt asteroid 3616 Glazunov were conducted in order to determine its synodic rotation period. We found P = 18.932 ± 0.004 h, A = 0.14 ± 0.03 mag
Rotation Periods for 1751 Herget, 2022 West and (23997) 1999 RW27
No full textPhotometric observations of three main-belt asteroids were made from Italy in order to determine their rotation periods. For 1751 Herget the synodic rotation period is 3.937 ± 0.001 hours, amplitude 0.30 magnitudes. For 2022 West the synodic rotation period is 14.14 ± 0.01 hours, amplitude 0.50 magnitudes. For (23997) 1999 RW27, the synodic rotation period is 17.82 ± 0.01 hours, amplitude 0.18 magnitudes
Rotation Period Determination for 449 Hamburga
Full text linkTwenty-three sessions on 449 Hamburga 2018 Dec. 3 - 2019 Feb. 12 provide a good fit to a synodic rotation period of 36.516 ± 0.001 hours with amplitude 0.06 ± 0.01 magnitudes and three unequal maxima and minima per rotational cycle
Photometric Analysis and Rotation Period Determination for Asteroids 5445 Williwaw, (8823) 1987 WS3 and (26568) 2000 ET49
Full text linkPhotometric observations of three main-belt asteroids were conducted in order to determine their synodic rotation periods. For 5445 Williwaw we found P = 10.65 ± 0.02 h, A = 0.29 ± 0.05 mag; for (8823) 1987 WS3, a slow rotator, we found a rough period of P = 86.0 ± 1.0 h, A = 0.24 ± 0.02 mag; for (26568) 2000 ET49 we found P = 7.171 ± 0.003 h, A = 0.71 ± 0.04 ma
Rotation Period Determination for (9659) 1996 EJ
No full textPhotometric observations of the main-belt asteroid (9659) 1996 EJ were conducted in order to determine its synodic rotation period. We found P = 6.527 ± 0.001 h, A = 0.09 ± 0.03 mag
GSC 3087 2079. Invito all'osservazione di una (quasi sospetta) variabile
No full textNel giugno 2002 Marvin Baldwin, presidente della sezione variabili RR Lyrae dell'AAVSO (American Association of Variable Star Observers, Associazione Americana degli osservatori di stelle variabili) ci propose di inserire nel nostro programma osservativo alcune variabili da poco scoperte durante la all-sky survey del progetto ROTSE (Robotic Optical Transient Search Experiment, Esperimento di ricerca automatica di transienti ottici). La stella scelta è GSC 3087 2079, che era stata classificata come RR Lyrae, sulla cui variabilità gli autori hanno compiuto uno studio durante l'estate del 2002 al fine di definirne il periodo. In questo articolo si riassumono i dati raccolti e si invitano altri osservatori alla raccolta di ulteriori dati.On June, 2002, Marvin Baldwin, chairman of the American Association of Variable Star Observers (AAVSO) RR Lyrae Committee, suggested to observe few variable stars recently discovered during the ROTSE project all-sky survey. The selected star was GSC 3087 2079 whose variability was confirmed using the data gathered by the authors during the 2002 summer. In this article we assign the variable to the RR Lyr c class, and invite the interested observers to collect further data
Lightcurve and Rotation Period Determination for 2496 Fernandus, 2727 Paton, and 69971 Tanzi
Full text linkPhotometric observations of the main-belt asteroids 2496 Fernandus, 2727 Paton, and 69971 Tanzi were made by the authors from 2019 January 3 to April 5. Analysis found bimodal lightcurves for each one. The most likely synodic periods are: 2496 Fernandus, 2.807 ± 0.001 h; 2727 Paton, 5.324 ± 0.001 h; and 69971 Tanzi, 32.540 ± 0.009 h
357 Ninina and 748 Simeisa - Two Asteroids with Earth Commensurate Rotation Periods
Full text linkA global collaboration of observers from Australia, Europe, and North America found synodic rotation periods and amplitudes for 357 Ninina 35.983 ± 0.001 h, 0.11 ± 0.01 magnitudes; 748 Simeisa 11.903 ± 0.001 h, 0.08 ± 0.01 magnitudes
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