Find The Observatory in Bologna

Click to open a larger map

Powered by Google Maps Widget

Loiano Observatory

Click to open a larger map

Powered by Google Maps Widget

Weather in Bologna

Bologna
September 25, 2016, 3:55 pm
Sunny
Sunny
24°C
real feel: 27°C
current pressure: 1020 mb
humidity: 40%
wind speed: 1 m/s N
sunrise: 7:06 am
sunset: 7:06 pm
 

Welcome to the Bologna Astronomical Observatory

DSCN3816b

 

              Photo by Roberto di Luca with Nikon p520, The G. D. Cassini telescope – in the foreground the sun model

Gaia16aye: the first binary microlensing event ever discovered towards the Galactic Plane

On 2016-08-05 the 1.2 mag brightening of an otherwise quiet stellar source triggered the Gaia16aye Gaia Science Alert, nicknamed Ayers Rock (19:40:01.13 +30:07:53.4, J2000). The previous 22 Gaia detections of the source (starting from 2014-10-30) show no variability greater than 0.05m RMS. The initial spectrophotometric observations did not clarify the nature of the observed flare (see ATel 9376) but the suspect of a bright microlensing event immediately rised and a spectrophotometric campaign started to monitor this source. Data obtained with the 1.5m telescope G.D. cassini by G. Altavilla (INAF-OABO) from Loiano at the beginning of September indicated a small rising trend in the light curves, as expected in the microlensing hypothesis. Moreover, in this hypothesis, modeling of the acquired light curves predicted another brightening (due to caustic crossing) in short times, hence intensively observations started again and G. Leto & R. Zanmar Sanchez (INAF-OACT) with the 0.8m robotic telescope APT2 from Serra la Nave observed a dramatic luminosity increase of Gaya16aye during the night between 17 and 18 September, 3 days after last observations in Loiano. This brightening confirmed the binary microlensing interpretation, and Gaia16aye results the first binary microlensing event ever discovered towards the Galactic Plane! Thanks to the light curve signatures secured by the photometric observations, we expect to characterize the size of the source in the units of the Einstein Radius, and in turn to estimate the mass of the lensing binary system. More information can be found in ATel 9507. The combined lightcurve and spectra can be found at http://scan.sai.msu.ru/~kirx/ATel/Gaia16aye/

Image of Gaia16aye obtained at the 1.5m G.D. Cassini Telescope, Loiano.

Image of Gaia16aye obtained by G. Altavilla at the 1.5m G.D. Cassini Telescope, Loiano, on September 14, 2016.

Gaia16aye light curves

Gaia16aye light curves.

 

Gaia Data Release 1

The Gaia spacecraft was launched on December 19th, 2013 to perform a 5-year long all-sky scanning survey that will provide exquisitely accurate astrometry (100 times better than Hipparcos) and photometry for about one billion of Galactic stars down to G ~20.7 (Gaia unfiltered band), and radial velocity for several millions of stars to

…→ Read More: Gaia Data Release 1

aspnottericercatori2016

bo13sett_a3_web

Aspettando la Notte dei Ricercatori 2016

conferenza3settembre

Il cielo sopra di noi Sabato 3 SETTEMBRE ORE 21:00 Conferenza: “I Mostri del cielo” Monte Bibele – Monterenzio (BO) Proseguono gli appuntamenti organizzati da INAF – Osservatorio Astronomico di Bologna, in collaborazione con le Biblioteche del distretto di San Lazzaro di Savena. Sabato 3 Settembre l’appuntamento con gli astronomi e` alle 21.00 a Monte

…→ Read More: conferenza3settembre

laser25agosto

Il cielo sopra di noi Giovedi 25 AGOSTO ORE 21:00 Laser fra le stelle Ca’ de Mandorli – San Lazzaro di Savena (BO) Proseguono gli appuntamenti organizzati da INAF – Osservatorio Astronomico di Bologna, in collaborazione con le Biblioteche del distretto di San Lazzaro di Savena. Giovedi` 25 Agosto l’appuntamento con gli astronomi e` alle

…→ Read More: laser25agosto