Saturday, August 31, 2019
" HD 140283 LA ESTRELLA MATUSALÉN " DESDE ROSARIO - ARGENTINA //// FOTOS: ESMERALDA SOSA -INFO: LICENCIADO EN FÍSICA JOSÉ LUIS LOMÁSCOLO ( DEDICADO A LA MEMORIA DE ARIEL SERRA )
27-08-2019
.. 10pm ..
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La estrella HD 140283 se encuentra dentro de la zona de la esfera celeste correspondiente a la constelación de Libra a una distancia de unos 200 años luz, su magnitud aparente es 7.2.
Posición de HD 140283 dentro de la constelación de Libra.
Créditos: A. Fujii y Z. Levay ( STScI, Space Telescope Science Institute ).
Basándose en observaciones que datan del 2000 se llegó a estimar que su edad sería de unos 16.000 millones de años, esto indicaba que algo dentro la cosmología o la física estelar debía de estar errado, según la primera, la edad del universo es de 13.799 millones de años, no podía esta estrella ser más antigua que el propio universo.
Haciendo uso de medidas más precisas efectuadas con el Telescopio Espacial Hubble se llegó a la conclusión de que su edad debía oscilar entre 13.660 y 15.260 millones de años, considerando el valor de edad más bajo tendríamos que la estrella se formó unos 139 millones de años después del Big Bang.
Debido a su edad la prensa popular le dió el apodo de "Estrella de Matusalén".
[ Matusalén patriarca que según la biblia vivió 969 años, posiblemente en un error de traducción se confundieron meses lunares con años, un mes sinódico = 29.530588 días ► 29.530588 X 969 = 28615.14 días.
Un año = 365.25 días ► 28615.14 días / 365.25 días = 78.34 años ]
Matusalén fue la persona de más edad registrada en la Biblia.
Era un patriarca hebreo hijo de Enoc, padre de Lamec y abuelo de Noé.
Según la Escritura alcanzó la avanzada edad de 969 años y su nombre es muy destacado en el Génesis donde Moisés registró la genealogía de Adán.
Imagen de la estrella HD 140283, captada por el telescopio Schmidt del Observatorio Anglo
Australiano del Reino Unido.
Creditos: Digitized Sky Survey ( DSS ), STScl / AURA, Palomar / Caltech , y UKSTU / AAO.
HD 140283 se encuentra en las primeras etapas de expansión para convertirse en gigante roja y presenta un rápido movimiento a través del cielo, pudiendo atravesar un ancho angular equivalente a la Luna llena en 1500 años, esta elevada velocidad pone en evidencia que la estrella es un visitante que está de paso en nuestro vecindario estelar.
Pertenece a la población estelar II, estrellas antiguas que se encuentran en el halo galáctico ( de esta región es originaria HD 140283 ).
El halo galáctico es una estructura de forma más o menos esférica que rodea nuestra galaxia constituído por gases poco densos, dentro del mismo se ubican los cúmulos globulares.
Esquema de los diferentes componentes de una galaxia.
Idea + info: Licenciado en Física José Luis Lomáscolo
( Museo Experimental de Ciencias )
Compaginación & fotos a cielo abierto:
Esmeralda Sosa
( Planetario Ciudad de Rosario )
... dedicado a la memoria de ARIEL SERRA ... ❤✨
... dedicado a la memoria de ARIEL SERRA ... ❤✨
Friday, August 30, 2019
NGC 7129 AND NGC 7142 Image Credit & Copyright: Steve Cannistra (StarryWonders)
This wide-field telescopic image looks toward the constellation Cepheus and an intriguing visual pairing of dusty reflection nebula NGC 7129 (right) and open star cluster NGC 7142. The two appear separated by only half a degree on the sky, but they actually lie at quite different distances. In the foreground, dusty nebula NGC 7129 is about 3,000 light-years distant, while open cluster NGC 7142 is likely over 6,000 light-years away. In fact, pervasive and clumpy foreground dust clouds in this region redden the light from NGC 7142, complicating astronomical explorations of the cluster. Still, NGC 7142 is thought to be an older open star cluster, while the bright stars embedded in NGC 7129 are perhaps a few million years young. The telltale reddish crescent shapes around NGC 7129 are associated with energetic jets streaming away from newborn stars.
COMET C/2018 W2 AFRICANO Taken by Michael Jäger on August 29, 2019 @ Weißenkirchen, Austria
Hello The comet is now slowly getting into the reach of binoculars. On August 29 he was around the 10m0 bright. The coma is now greater than 5 arc minutes, but the comet is only moderately condensed. On the images no tail is visible. Image from August 29th at 2.20 UT with 8 "/2.0 RASA and CCD L-4x3 min filter green, Regards Michael Jäger
Thursday, August 29, 2019
M27: NOT A COMET Image Credit & Copyright: Bob Franke
While hunting for comets in the skies above 18th century France, astronomer Charles Messier diligently kept a list of the things he encountered that were definitely not comets. This is number 27 on his now famous not-a-comet list. In fact, 21st century astronomers would identify it as a planetary nebula, but it's not a planet either, even though it may appear round and planet-like in a small telescope. Messier 27 (M27) is an excellent example of a gaseous emission nebula created as a sun-like star runs out of nuclear fuel in its core. The nebula forms as the star's outer layers are expelled into space, with a visible glow generated by atoms excited by the dying star's intense but invisible ultraviolet light. Known by the popular name of the Dumbbell Nebula, the beautifully symmetric interstellar gas cloud is over 2.5 light-years across and about 1,200 light-years away in the constellation Vulpecula. This impressive color composite highlights details within the well-studied central region and fainter, seldom imaged features in the nebula's outer halo. It incorporates broad and narrowband images recorded using filters sensitive to emission from hydrogen and oxygen atoms.
Wednesday, August 28, 2019
MESSIER 61 CLOSE UP Image Credit: NASA, ESA, Hubble, ESO, Amateur Data; Processing & Copyright: Robert Gendler & Roberto Colombari
Image data from the Hubble Space Telescope, the European Southern Observatory, and small telescopes on planet Earth are combined in this magnificent portrait of face-on spiral galaxy Messier 61 (M61). A mere 55 million light-years away in the Virgo Cluster of Galaxies, M61 is also known as NGC 4303. It's considered to be an example of a barred spiral galaxy similar to our own Milky Way. Like other spiral galaxies, M61 also features sweeping spiral arms, cosmic dust lanes, pinkish star forming regions, and young blue star clusters. The bright galactic core is offset to the left in this 50 thousand light-year wide close-up.
Tuesday, August 27, 2019
COLORFUL CLOUDS NEAR ANTARES Image Credit: David McGarvey
Why is the sky near Antares and Rho Ophiuchi so dusty yet colorful? The colors result from a mixture of objects and processes. Fine dust illuminated from the front by starlight produces blue reflection nebulae. Gaseous clouds whose atoms are excited by ultraviolet starlight produce reddish emission nebulae. Backlit dust clouds block starlight and so appear dark. Antares, a red supergiant and one of the brighter stars in the night sky, lights up the yellow-red clouds on the lower left of the featured image. Rho Ophiuchi lies at the center of the blue nebula near the top. The distant globular cluster M4 is visible to the right of Antares. These star clouds are even more colorful than humans can see, emitting light across the electromagnetic spectrum.
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Monday, August 26, 2019
COMPLEJO ASTRONÓMICO MUNICIPAL DE ROSARIO //// CAM GRUPO 5
Muchas Gracias Chicos !... experiencia INOLVIDABLE !
SUNSET Taken by juan manuel pérez rayego on August 25, 2019 @ merida, spain.
dslr + 400mm f/5.6, av 5.6, tv 1/250, exp -1, iso 200, imagen recortada
OPEN CLUSTER M7 Taken by Raffaele Esposito on August 26, 2019 @ ITelescope Siding Spring Australia
APO 530/107 CCD: FLI Microline 11002 Total exposure 30 minutes.
NORTHERN CYGNUS Taken by Ruslan Merzlyakov on August 25, 2019 @ Møn, Denmark
Beautiful nebulae in Northern Cygnus, just 34 minutes of data. Shot in my backyard. Canon EOS 6D + Samyang 135mm f/2 + iOptron skytracker + Optolong L-Pro 17x120'', f/2.8, ISO 2500
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OUR HOME, OUR GALAXY Taken by Piotr Dzikowski on June 30, 2019 @ Namibia
1x1min, iso6400, Nikond810A
Sunday, August 25, 2019
30 YEARS AGO: VOYAGER 2'S HISTORIC NEPTUNE FLYBY
https://www.nasa.gov/feature/jpl/30-years-ago-voyager-2s-historic-neptune-flyby
https://voyager.jpl.nasa.gov/galleries/images-voyager-took/neptune/
Images Voyager Took of Neptune
In the summer of 1989, NASA’s Voyager 2 became the first spacecraft to observe the planet Neptune, its final planetary target. Passing about 4,950 kilometers (3,000 miles) above Neptune’s north pole, Voyager 2 made its closest approach to any planet since leaving Earth 12 years ago. Five hours later, Voyager 2 passed about 40,000 kilometers (25,000 miles) from Neptune’s largest moon, Triton, the last solid body the spacecraft will have an opportunity to study.
Voyager 1, launched September 5, 1977, visited Jupiter in 1979 and Saturn in 1980. It is now leaving the solar system, rising above the ecliptic plane at an angle of about 35 degrees, at a rate of about 520 million kilometers a year.
Voyager 2, launched August 20, 1977, visited Jupiter in 1979, Saturn in 1981 and Uranus in 1986 before making its closest approach to Neptune on August 25, 1989. Voyager 2 traveled 12 years at an average velocity of 19 kilometers a second (about 42,000 miles an hour) to reach Neptune, which is 30 times farther from the Sun than Earth is. Voyager observed Neptune almost continuously from June to October 1989. Now Voyager 2 is also headed out of the solar system, diving below the ecliptic plane at an angle of about 48 degrees and a rate of about 470 million kilometers a year.
Both spacecraft will continue to study ultraviolet sources among the stars, and their fields and particles detectors will continue to search for the boundary between the Sun's influence and interstellar space. If all goes well, we will be able to communicate with the two spacecraft for another 20 years, until their radioactive power sources can no longer supply enough electrical energy to power critical subsystems.