Current model photometrical visual of comet C/2012 S1 ISON

The current photometrical visual model of comet ISON show ~ 1.5 - 2 visuals magnitudes below the theorical my photometric model is based only on visual observations, my previous calculations of the dust production rate confirmed that the comet will not be as bright as expected, compute a maximum visual magnitude is very risky

NAU-led team discovers comet hiding in plain sight

For 30 years, a large near-Earth asteroid wandered its lone, intrepid path, passing before the scrutinizing eyes of scientists while keeping something to itself: 3552 Don Quixote, whose journey stretches to the orbit of Jupiter, now appears to be a comet. The discovery resulted from an ongoing project led by researchers at Northern Arizona University using the Spitzer Space Telescope. Through a lot of focused attention and a little bit of luck, they found evidence of cometary activity that had evaded detection for three decades. “Its orbit resembled that of a comet, so people assumed it was a comet that had gotten rid of all its ice deposits,” said Michael Mommert, a post-doctoral researcher at NAU who was a Ph.D. student of professor Alan Harris at the German Aerospace Center (DLR) in Berlin at the time the work was carried out. What Mommert and an international team of researchers discovered, though, was that Don Quixote was not actually a dead comet—one that had shed the carbon dioxide and water that give comets their spectacular tails. Instead, the third-biggest near-Earth asteroid out there, skirting Earth with an erratic, extended orbit, is “sopping wet,” said NAU associate professor David Trilling. The implications have less to do with potential impact, which is extremely unlikely in this case, and more with “the origins of water on Earth,” Trilling said. Comets may be the source of at least some of it, and the amount on Don Quixote represents about 100 billion tons of water—roughly the same amount found in Lake Tahoe. Mommert said it’s surprising that Don Quixote hasn’t been depleted of all of its water, especially since researchers assumed that it had done so thousands of years ago. But finding evidence of CO2, and presumably water, wasn’t easy. During an observation of the object using Spitzer in August 2009, Mommert and Trilling found that it was far brighter than they expected. “The images were not as clean as we would like, so we set them aside,” Trilling said. Much later, though, Mommert prompted a closer look, and partners at the Harvard-Smithsonian Center for Astrophysics found something unusual when comparing infrared images of the object: something, that is, where an asteroid should have shown nothing. The “extended emission,” Mommert said, indicated that Don Quixote had a coma—a comet’s visible atmosphere—and a faint tail. Mommert said this discovery implies that carbon dioxide and water ice also might be present on other near-Earth objects. This study confirmed Don Quixote’s size and the low, comet-like reflectivity of its surface. Mommert is presenting the research team’s findings this week at the European Planetary Space Conference in London. Notice complete : http://news.nau.edu/nau-led-teams-discovers-comet-hiding-in-plain-sight/

PERIODOGRAM OF COMET C/2012 S1 ISON

I calculated the period of rotation of comet C/2012 S1 ISON , my calculations based in database from MPC ( IAU ) 3.058 ccd magnitudes ( T-N ), the periodogram type used is LOMB-SCARGLE , from NASA EXOPLANET PERIODOGRAM SERVICE , the results show rotation period of Prot= 7,996 hours , P = 0.333196 , this results coincide as diameter of comet of nucleus of 5 kms , based in data from SWIFT/NASA .

LIGHT CCD CURVE OF COMET ISON C/2012 S1

Updated the light ccd curve of comet C/2012 S1 ISON , the curve shows a drop in brightness on the red line expected theoretical , i reduced to conversion formula visual to ccd , and the maximun brightness is possible ~ +3.5 in perihelion , based in 3058 ccd observations .

Polarimetry of comet ison

Image of arc emission outburst dust of comet 29p

COMET 29P/ SW-1 image of arc emission outburst dust , processed by J.P.Navarro Pina . Credit image : SPITZER TELESCOPE Smog Check for Comets: Measuring cometary CO2, CO, and particulate emissions Category: solarSystem: cometsPI: Reach, William T We propose to measure the CO2, CO, and dust emission from a sample of comets. This study is in the spirit of the A'Hearn et al. compilation of the OH, C2, and dust production rates for 85 comets, wherein the only widely accepted, physically-based taxonomic types of comets were identified. Specifically, C-chain-poor comets, which are predominantly dynamically short-period comets that formed in the Kuiper Belt, are distinct from the C-chain-rich comets that tend to be long-period comets arriving from the Oort cloud and having formed formed in the Jupiter-Saturn region. Spitzer/IRAC observations are unique in their sensitivity to CO2 and CO gas. CO and CO2 have prominent spectral bands that fall within IRAC channel 2, while dust strongly dominates IRAC channel 1. Despite being the second and third most abundant compositions of cometary ice, their high abundance in the Earth's atmosphere makes ground-based observations exceptionally difficult.

Image from Infrared Telescope Spitzer of comet 67P/ target of probe ROSSETTA , processed and analysis by J.P.Navarro Pina Credit :Infrared Science Archive (IRSA) at the Infrared Processing and Analysis Center (IPAC), California Institute of Technology. Technical Data : Telescope: Spitzer CampaignId: 1444 (MIPS014400) Request Type: AOR Mode: MIPS Phot AORKEY: 28139776 Observer: Jessica Agarwal Target Name: Churyumov-Gerasimenko Program Title: CGTRAIL_C5 Program ID: 50650 AOR Title: mips_cgt_dma0_dec08_pr Observation Start: 2008-11-23 04:09:13.25 Observation End: 2008-11-23 04:26:48.641

WATER RATE PRODUCTION ISON COMET

Theorical graphical of water rate production C/2012 S1 ISON

NEW IMAGE OF COMET C/2012 S1 ISON OF HUBBLE SPACE TELESCOPE

New image processed of comet C/2012 S1 ISON by J.P.Navarro Pina ( Team CIOC_ISON and Cometary Investigation Astrophysic G_FB ) , of credit original observing program: 13229 - Levay, Zolt - Space Telescope Science Institute Hubble Heritage imaging of Comet ISON , the new calculations of diameter of coma based in images of HUBBLE SPACE TELESCOPE , show Axis major 70.000 kms and axis minor 29.700 kms the original fit image have processed by Navarro Pina by software DS9 , the image of ISON's comet applied isophotes and false colour . Proposal Abstract: PI Zolt Levay (Space Telescope Science Institute) We propose a program to image Comet C/2012 S1 {ISON} in three phases with similar observations: early epoch, pre-perihelion, and post-perihelion. These observations are intended to complement other observing proposals to produce still imaging and small movies to maximize public engagement with this expected spectacular sky phenomenon.; click image for enlarge

Search of Precession period of comet C/2011 L4 PANSTARRS

A search of periodicities ( precession period ) of comet C/2011 L4 PANSTARRS based in 302 visuals observations from ICQ , COMET OBS and OBSERVADORESCOMETAS ,processed by software of analysis NASA EXOPLANET ARCHIVE , the preliminar results indicate Power 25.14 , the possible firts period of 42 days , based in periodogram type Lomb-Scargle , in the range 10 < P precess < 50 days .

Image from HUBBLE SPACE TELESCOPE Imaging Polarimetry of the 2013 Comet ISON with ACS

Image from HUBBLE SPACE TELESCOPE of comet C/2012 S1 ISON processed and analyzed by J.P.Navarro Pina for CIOC_ISON and COMETARY INVESTIGATION ASTROPHYSIC GROUP_FACEBOOK CREDIT : Imaging Polarimetry of the 2013 Comet ISON with ACS: A Pre-Perihelion Study of the Heterogeneous Coma PI Dean Hines (Space Telescope Science Institute)