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La serra del Montsec ha estat reconeguda des de fa molts anys com un dels indrets que mostren unes condicions d'observació astronòmica excepcionals tant pels seus condicionants meteorològics com per la baixa afectació de la contaminació lumínica. Les mesures de contaminació lumínica realitzades en la darrera dècada han mostrat que una gran part de la zona del Montsec presenta unes condicions excepcionals de foscor i el fet que les afectacions dels municipis integrants de la zona siguin molt baixes garanteix la qualitat i la preservació d'aquest cel nocturn.
L'any 2007, en el marc de la Conferencia Internacional en Defensa de la Qualitat del Cel Nocturn i el Dret a Observar les Estrelles, celebrada a l'Illa de La Palma, es va aprovar la Declaració Mundial en Defensa del Cel Nocturn i el Dret a Observar les Estrelles, coneguda internacionalment com la Declaració de La Palma o Declaració Starlight. A partir d'aquesta declaració sorgeix el sistema de certificació Starlight, realitzat per la Fundació Starlight amb l'aval de la UNESCO amb el seu programa MaB (Home i Biosfera).
A finals de l'any 2012, el Montsec i el seu cel van ser avaluats mitjançant els processos d'auditories astronòmica i turística establerts per la Fundació Starlight per tal de poder certificar la idoneïtat del Montsec. L'avaluació realitzada va concloure, a inicis de l'any 2013, que un total de vint-i-quatre termes municipals (total o parcialment) eren certificats com a destinació turística Starlight i que onze dels mateixos (total o parcialment), també eren certificats com a reserva Starlight (cels excel·lents). La conclusió final de tot el procés és que el Montsec i el seu cel és un dels millors llocs del món per fer observació astronòmica i gaudir de la llum de les estrelles.
El Parc Astronòmic Montsec (PAM) és una iniciativa del Govern de Catalunya, per tal d'aprofitar les aptituds i potencialitats de la zona del Montsec per a la realització de recerca, formació i divulgació de la ciència, en especial de l'astronomia. El PAM aprofita les característiques que fan del Montsec el lloc més adequat de Catalunya per a la instal·lació d'uns centres amb les particularitats de l'Observatori Astronòmic del Montsec (OAdM) i del Centre d'Observació de l'Univers (COU). Per tal de poder aprofitar el màxim una instal·lació astronòmica, cal que es compleixin unes condicions de l'entorn, que n'afavoreixin el seu rendiment i explotació. En particular, cal avaluar la qualitat de les imatges que s'hi poden obtenir (estudi de l'estabilitat de la imatge o seeing), les condicions meteorològiques del lloc i l'afectació de la contaminació lumínica de l'emplaçament. Diversos estudis científics han corroborat la idoneïtat del lloc, i es va concloure que el Montsec era un indret únic a Catalunya per a la instal·lació d'equipament astronòmic professional i per a un centre de docència i divulgació de l'astronomia, com és el Parc Astronòmic Montsec. En particular, la baixa pluviometria (inferior a 500 mm/any), humitat moderada i un percentatge elevat de nits serenes, el feien un emplaçament adient. Les proves de qualitat d'imatges van demostrar que la seva alçada damunt del nivell del mar i la seva notable distància a la costa mediterrània, permetien tenir una estabilitat adequada. Finalment, els estudis de contaminació lumínica van qualificar el cel de l'emplaçament del Parc Astronòmic Montsec com un cel lliure de contaminació lumínica i aquest fet li va valdre la qualificació de punt de referència en la protecció del cel per la Llei 6/2001 del Parlament de Catalunya, la coneguda com a “Llei de la Contaminació Lumínica”.
L'Observatori Astronòmic del Montsec (OAdM) és un observatori astronòmic ubicat a la Serra del Montsec, en el terme municipal de Sant Esteve de la Sarga (Pallars Jussà). Inaugurat el 24 d'octubre de 2008 disposa actualment del telescopi més gran i avançat de Catalunya. Forma part del Parc Astronòmic Montsec (PAM) conjuntament amb el Centre d'Observació de l'Univers (COU). L'OAdM és el tercer observatori professional del país, després de l'Observatori Fabra (inaugurat el 1904) i l'Observatori de l'Ebre (1905).
El telescopi de l'OAdM porta el nom de Joan Oró en honor del bioquímic lleidatà, un dels principals promotors del projecte.
El telescopi Assumpció Català, inaugurat el 2015, forma part de l'Observatori-Aula del Centre d'Observació de l'Univers,és un telescopi reflector Dall-Kirkham de 50 centímetres de diàmetre, el més gran dels que estan habilitats en aquest centre. Està completament automatitzat i disposa d'una càmera CCD i de diversos filtres que permeten obtenir imatges astronòmiques de qualitat. Tindrà un ús docent tant per a la universitat com per al batxillerat, l'educació secundària i la primària. L'instrument, amb un vessant important de divulgació al públic general, permet que setanta persones puguin observar simultàniament des de cossos del Sistema Solar fins a galàxies de l'Univers remot.
Aquesta imatge ha jugat a En un lugar de Flickr.
Exif
Camera: Nikon D700
Lens: Nikon 24.0-70.0 mm f/2.8 G
Aperture: f/3,5
Exposure Time: 1/50
Focal Length: 62mm
ISO: 200
Using the Dragoon core legs and torso mount, this heavy, short-to-mid-range beast is heavily armored and hits like a space freighter, but is effectively blind without sensory instruments and it moves slowly.
One of Webb’s most complex instrument modes is with the MIRI Medium Resolution Spectrometer (MRS). The MRS is an integral-field spectrograph, which provides spectral and spatial information simultaneously for the entire field of view. The spectrograph provides three-dimensional ‘data cubes’ in which every pixel in an image contains a unique spectrum. Such spectrographs are extremely powerful tools to study the composition and kinematics of astronomical objects, as they combine the benefits of both traditional imaging and spectroscopy.
“The MRS is designed to have a spectral resolving power (observed wavelength divided by the smallest detectable wavelength difference) of about 3,000. That is high enough to resolve key atomic and molecular features in a variety of environments. At the highest redshifts, the MRS will be able to study hydrogen emission from the first galaxies. At lower redshifts, it will probe molecular hydrocarbon features in dusty nearby galaxies and detect the bright spectral fingerprints of elements such as oxygen, argon, and neon that can tell us about the properties of ionized gas in the interstellar medium. Closer to home, the MRS will produce maps of spectral features due to water ice and simple organic molecules in giant planets in our own solar system and in planet-forming disks around other stars.
“In order to cover the wide 5 to 28 micron wavelength range as efficiently as possible, the MRS integral field units are broken up into twelve individual wavelength bands, each of which must be calibrated individually. Over the past few weeks, the MIRI team (a large international group of astronomers from the USA and Europe) has been focusing primarily on calibrating the imaging components of the MRS. They want to ensure that all twelve bands are spatially well aligned with each other and with the MIRI Imager, so that it can be used to place targets accurately into the smaller MRS field of view. We show some early test results from this alignment process, illustrating the image quality achieved in each of the twelve bands using observations of the bright K giant star HD 37122 (located in the southern sky near the Large Magellanic Cloud).
“Once the spatial alignment and image quality of the several bands are well characterized, the MIRI team will prioritize calibrating the spectroscopic response of the instrument. This step will include determining the wavelength solution and spectral resolution throughout each of the twelve fields of view using observations of compact emission-line objects and diffuse planetary nebulae ejected by dying stars. We show the exceptional spectral resolving power of the MRS with a small segment of a spectrum obtained from recent engineering observations of the active galactic nucleus at the core of Seyfert galaxy NGC 6552. Once these basic instrument characteristics are established, it will be possible to calibrate MRS so that it is ready to support the wealth of Cycle 1 science programs due to start in a few short weeks.”
Read more: blogs.nasa.gov/webb/2022/06/16/webbs-mid-infrared-spectro...
This image: This portion of the MIRI MRS wavelength range shows engineering calibration data obtained of the Seyfert galaxy NGC 6552 (red line) in the constellation Draco. The strong emission feature is due to molecular hydrogen, with an additional weaker feature nearby. The blue line shows a lower spectral resolution Spitzer IRS spectrum of a similar galaxy for comparison. The Webb test observations were obtained to establish the wavelength calibration of the spectrograph. Credit: NASA, ESA, and the MIRI Consortium.
Je poursuis mes dessins dans l'expo sur les instruments de musique. Cette fois-ci gros plan sur certains des outils du luthier.
At the very beginning of the Brussels Musical Instruments Museum's creation, two collections of instruments were joined together. the original creation of the Brussels Musical Instruments Museum dates from 1 February 1877, when it was attached to the Brussels Royal Music Conservatory with the didactic purpose of showing early instruments to the students. The Old England Building, Brussels Designed by architect Paul Saintenoy, the Old England building was constructed in 1899 and is considered one of Brussels's Art Nouveau gems. The former department store now houses the Museum of Musical Instruments.
One of the last makers of traditional Mapuche musical instruments. Photographed near lake Maihue for use with one of Andrian Pertout's compositions.
I like the collection of instruments. They resemble more familiar ones, but give out different sounds.
#AbFav_musical
Concerts in the Park.
It is a well-known fact that England is a land of traditions and proudly so!
It was extremely pleasant, last summer, to discover that in the many parks, in and around the city, every Sunday afternoon, brass bands were to give concerts!
...but it was rather melancholic to hear that oooh so specific familiar sound of the brass instruments, and the old sweet tunes floating through the leaves as the rains started, people sought refuge inside the small café, while quite a few listeners brought out their raincoats and umbrellas, and stoically stayed put, like the band, who kept on playing!
This was the Tuba section, during a short break, new sheets of music, drying out the instruments, he had put it upside down.
He put a protective hand on it, just like you do with a child, a caress for loved one, pat a pet...
All the best and thank you for your comments, M, (*_*)
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... The traditional string instrument, the "Qanoun".. in the hands of the brilliant Osama Khoury..
Isn't that a great name?
From a catalog of band instruments, without the background. I see now that I left a little bloop on the rim... some day perhaps I'll fix it.
Public domain.
Qazvin carpet instrument innovated by a Qazvinian artist, Mr. Shokri.
The instrument is the first one that can be played simultaneously in different modes like percussion, bow and plectrum.
This instrument is inspired by the rug.
Here are a few videos showing how this remarkable instrument is played:
Each musical instrument must have an own long story of Jazz at New Orleans. Some could have been played on a street and other could have been played at a bar. I wanted to stay there a little bit longer to hear their own stories with a glass of whisky.
This seasonal ornament stands about twenty feet (6 meters) tall. An angel bringing good news would be welcome today!
Photos taken for work of students at Madison Elementary School receiving new band instruments, a gift of the Des Moines Public Schools Foundation. The school, a participant in the federal Turnaround Arts program, has gone from now students in band two years ago to more than 20 and growing today.
Also taken on the day of closure, this shows the lever frame and instrument shelf - complete with illuminated diagram, Tyers three-position instrument and three wood-cased signal repeaters.
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Sunny but very cold and very, very windy at the Santa Claus Parade staging area (Christie Pits), Toronto, Nov. 20 2022. First in person Santa Claus parade since 2019 - cancelled in 2020 and 2021 due to Covid-19.
Only the street shots - thestreetzine.blogspot.com/
The Rebab is an 8th century stringed instrument of the Arabian Peninsular and it has a limited range of a little over one octave. It is used by the Bedouin. The tent is a Bedouin woven tent and the carpets are traditional woven Arabian mats.
The Dominion Astrophysical Observatory is a designated National Historical Site. The 106-year old Plaskett Telescope was the largest in the world when it opened. It is still used nightly for scientific research. The main instrument is the 72-inch-aperture (1.83 m) Plaskett telescope, proposed and designed by John S. Plaskett in 1910 with the support of the International Union for Cooperation in Solar Research. The glass mirror, 72 inches (1.83 m) in diameter and 12 inches (0.30 m) thick, weighs approximately 4,340 pounds (1.97 t) was made by the Saint-Gobain company in the Charleroi glass works in Antwerp, Belgium. It was shipped only a week before the start of World War I. It was then ground in the United States at the John A. Brashear Co. (founded by astronomer and telescope pioneer John A. Brashear) in Pittsburgh. The mirror had to be reground twice, once due to a scratch and the second time due to a flaw in the grinding. This added two years to the completion time of the telescope, pushing the date back to 1918. The mirror was sent to Victoria by train, which arrived in Victoria six days later. The completed mirror was hauled up Little Saanich Mountain by horse and wagon. In 1962, a 48-inch (1.22 m) optical telescope was added to the observatory; it was ordered in 1957, and was made by Grubb Parsons of Newcastle-upon-Tyne, England.