jueves, 11 de agosto de 2016

Imagen del cometa C/2016 A8 (LINEAR)

Imagen tomada el 11.08.16 formada por 20 tomas individuales de 60s cada uno sin filtro. Seguimiento sobre el cometa.

viernes, 5 de febrero de 2016

Imagen del cometa C/2013 US10 (CATALINA)

Imagen del cometa C/2013 US10 (CATALINA) el 3 de Febrero de 2016. Composición de 60 imágenes de 120s cada una sin uso de filtro.

domingo, 17 de enero de 2016

Cometa C/2014 A4 (SONEAR) y Galaxia NGC 7814

Imagen del cometa C/2014 A4 (SONEAR) tomada el 16 de Enero de 2016. En el mismo campo abajo a la izquierda la galaxia espiral NGC 7814 en la constelación de Pegaso.

sábado, 2 de enero de 2016

Cometa C/2013 X1 (PANSTARRS)

Imagen del cometa C/2013 X1 (PANSTARRS) la noche del 29 de Diciembre de 2015.

miércoles, 23 de diciembre de 2015

Cometa C/2013 US10 (Catalina)

Cometa C/2013 US10 (catalina) el 21/12/2015. Imagen procesada a partir del promedio de 15 tomas individuales de 60s cada una alineadas sobre el centro del cometa en banda fotométrica V. Se observan dos colas: la nube de polvo que el cometa deja tras de sí hacia abajo en la imagen y la cola iónica mucho mas fina hacia la derecha y arriba en dirección opuesta al Sol.

martes, 24 de noviembre de 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.

martes, 17 de noviembre de 2015