Wednesday, December 23, 2015
Tuesday, November 24, 2015
Results from campaign ISON C/2010 S1
We present the results of a global coma morphology campaign for comet C/2012 S1 (ISON), which was
organized to involve both professional and amateur observers. In response to the campaign, many
hundreds of images, from nearly two dozen groups were collected. Images were taken primarily in the
continuum, which help to characterize the behavior of dust in the coma of comet ISON. The campaign
received images from January 12 through November 22, 2013 (an interval over which the heliocentric
distance decreased from 5.1 AU to 0.35 AU), allowing monitoring of the long-term evolution of coma
morphology during comet ISON's pre-perihelion leg. Data were contributed by observers spread around
the world, resulting in particularly good temporal coverage during November when comet ISON was
brightest but its visibility was limited from any one location due to the small solar elongation. We
analyze the northwestern sunward continuum coma feature observed in comet ISON during the first half
of 2013, finding that it was likely present from at least February through May and did not show variations
on diurnal time scales. From these images we constrain the grain velocities to 10 m s1
, and we find
that the grains spent 2–4 weeks in the sunward side prior to merging with the dust tail. We present a
rationale for the lack of continuum coma features from September until mid-November 2013, determining
that if the feature from the first half of 2013 was present, it was likely too small to be clearly
detected. We also analyze the continuum coma morphology observed subsequent to the November 12
outburst, and constrain the first appearance of new features in the continuum to later than November
13.99 UT.
Nalin H. Samarasinha a,n , Beatrice E.A. Mueller a , Matthew M. Knight b , Tony L. Farnham c , John Briol d , Noah Brosch e , John Caruso f , Xing Gao g , Edward Gomez h , Tim Lister h , Carl Hergenrother i , Susan Hoban j , Roy Prouty j , Mike Holloway k , Nick Howes l , Ernesto Guido l , Man-To Hui m, Joseph H. Jones n , Tyler B. Penland n , Samuel R. Thomas n , Jim Wyrosdick n , Nikolai Kiselev o , Aleksandra V. Ivanova o , Thomas G. Kaye p , Jean-Baptist Kikwaya Eluo q , Betty P.S. Lau r , Zhong-Yi Lin s , José Luis Martin t , Alexander S. Moskvitin u , Martino Nicolini v , Brian D. Ottum w, Chris Pruzenski x , David C. Vogel x , Leo Kellett x , Valerie Rapson x , Joel Schmid x , Brandon Doyle x , Frank Dimino x , Stephanie Carlino x , Margarita Safonova y , Jayant Murthy y , Firoza Sutaria y , David G. Schleicher b , Colin Snodgrass z , Cihan T. Tezcan aa, Onur Yorukoglu aa, David Trowbridge bb, Dennis Whitmer cc, Quan-Zhi Ye dd
t Carpe Noctem Observatory, Spain
Full paper here.
Tuesday, November 17, 2015
Monday, November 16, 2015
Monday, September 28, 2015
Saturday, September 19, 2015
Wednesday, July 29, 2015
Friday, May 22, 2015
Monday, February 9, 2015
Nueva Imagen del cometa Lovejoy
Tuesday, January 27, 2015
"Sobrevuelo" del asteroide 2004 BL86
Mereció la pena dedicarle unas cuantas horas de observación a este importante asteroide, de tamaño respetable -menos de 500m- y que tuvo ayer 26 de Enero de 2015 su mayor aproximación a la tierra, aunque lejos, a más de 1 millon de Km, de suponer un peligro para nuestro planeta. La siguiente vez que se aproxime será tanto será en 200 años, la oportunidad es ciertamente única a escala humana...
En la primera animación en bucle no hay seguimiento sobre el asteroide, tan solo sobre las estrellas por supuesto para compensar la rotación terrestre, por lo que estas aparecen fijas.
En la segunda animación de imágenes individuales, el telescopio realiza un seguimiento sobre el propio asteroide, de modo que lo que aparece en movimientos son las estrellas en un segundo plano.
Wednesday, January 7, 2015
Animación cometa C/2014 Q2 (Lovejoy)
Hacía ya algún tiempo que no teníamos un cometa tan brillante al alcance del observatorio. En esta ocasión se trata del C/2014 Q2. Las imágenes individuales son tomas de 60 segundos, lo cual produjo una ligera saturación de la coma del cometa -la zona más brillante- pero a cambio ofrece algunos detalles de la filamentosa cola creada a partir de partículas desprendidas del cometa. Aunque poco contrastada la cola se observa hacia la izquierda en la imagen y saliendo de la misma. El movimiento de algunos de esas estructuras sugiere que están provocadas por la propia rotación del cometa.
Animación del cometa C/2014 Q2 a partir de 25 imágenes tomadas el 7 de Enero de 2015. (C) José Luis Martín. |
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