82 citations · 407 across the 23 of their papers we have counts for
23 papers
NSF-DOE Vera C. Rubin Observatory Observations of Interstellar Comet 3I/ATLAS (C/2025 N1)
Colin Orion Chandler, Pedro H. Bernardinelli, Mario Jurić +305
We report on the observation and measurement of astrometry, photometry, morphology, and activityof the interstellar object 3I/ATLAS, also designated C/2025 N1 (ATLAS) with the NSF-…
Physical and Surface Properties of Comet Nuclei from Remote Observations
Matthew M. Knight, Rosita Kokotanekova, Nalin H. Samarasinha
We summarize the collective knowledge of physical and surface properties of comet nuclei, focusing on those that are obtained from remote observations. We now have measurements or…
Analysis of CN Coma Morphology Features of Comet 21P/Giacobini-Zinner
Charles Goldberg, Cassandra Lejoly, Nalin Samarasinha
We analyze jet features found in the coma of Comet 21P/Giacobini-Zinner (21P/GZ) during its 2018 perihelion passage using narrowband CN photometric imaging in order to determine th…
29P/Schwassmann-Wachmann: A Rosetta Stone for Amorphous Water Ice and CO <-> CO2 Conversion in Centaurs and Comets?
C. M. Lisse, J. K. Steckloff, D. Prialnik +12
Centaur 29P/Schwassmann-Wachmann 1 (SW1) is a highly active object orbiting in the transitional Gateway region (Sarid et al. 2019) between the Centaur and Jupiter Family Comet regi…
Modelling the water and carbon dioxide production rates of Comet 67P/Churyumov-Gerasimenko
Björn J. R. Davidsson, Nalin H. Samarasinha, Davide Farnocchia +1
The European Space Agency Rosetta/Philae mission to Comet 67P/Churyumov-Gerasimenko in 2014-2016 is the most complete and diverse investigation of a comet carried out thus far. Yet…
Radial Distribution of the Dust Comae of Comets 45P/Honda-Mrkos-Pajduusáková and 46P/Wirtanen
C. Lejoly, W. Harris, N. Samarasinha +21
There was an unprecedented opportunity to study the inner dust coma environment, where the dust and gas are not entirely decoupled, of comets 45P/Honda-Mrkos-Pajduusáková (45P/HMP)…
Repeating gas ejection events from comet 45P/Honda-Mrkos-Pajdušáková
Alessondra Springmann, Walter M. Harris, Erin L. Ryan +6
Studying materials released from Jupiter-family comets (JFCs) -- as seen in their inner comæ, the envelope of gas and dust that forms as the comet approaches the Sun -- improves th…
Characterization of Thermal Infrared Dust Emission and Refinements to the Nucleus Properties of Centaur 29P/Schwassmann-Wachmann 1
Charles A. Schambeau, Yanga R. Fernandez, Nalin H. Samarasinha +4
We present analyses of Spitzer observations of 29P/Schwassmann-Wachmann 1 using 16 m IRS "blue" peak-up (PU) and 24 m and 70 m MIPS images obtained on UT 2003 November 23…
Sublimation as an effective mechanism for flattened lobes of (486958) Arrokoth
Yuhui Zhao, Ladislav Rezac, Yuri Skorov +3
The New Horizons spacecraft's flyby of Kuiper Belt Object (KBO) (486958) Arrokoth revealed a bilobed shape with highly flattened lobes both aligned to its equatorial plane, and a r…
Analysis of HST WFPC2 Observations of Centaur 29P/Schwassmann-Wachmann 1 while in Outburst to Place Constraints on the Nucleus' Rotation State
Charles Schambeau, Yanga Fernandez, Nalin Samarasinha +2
We present analysis of {\it Hubble Space Telescope} (HST) observations of Centaur 29P/Schwassmann-Wachmann 1 (SW1) while in outburst to characterize the outburst coma and place con…
Further investigation of changes in cometary rotation
Beatrice E. A. Mueller, Nalin H. Samarasinha
Samarasinha & Mueller (2013) related changes of cometary rotation to other physical parameters for four Jupiter family comets defining a parameter , which is approximately const…
The Sublimative Torques of Jupiter Family Comets and Mass Wasting Events on Their Nuclei
Jordan K. Steckloff, Nalin H. Samarasinha
Sublimative outgassing of comets produces torques that alter the rotation state of their nuclei. Recently, parameterized sublimative torque models have been developed to study rota…
The Unusual Apparition of Comet 252P/2000 G1 (LINEAR) and Comparison with Comet P/2016 BA14 (PanSTARRS)
Jian-Yang Li, Michael S. P. Kelley, Nalin H. Samarasinha +7
We imaged Comet 252P/2000 G1 (LINEAR) (hereafter 252P) with the Hubble Space Telescope and both 252P and P/2016 BA (PanSTARRS) (hereafter BA) with the Discovery Chann…
Seasonal Evolution on the Nucleus of Comet C/2013 A1 (Siding Spring)
Jian-Yang Li, Nalin H. Samarasinha, Michael S. P. Kelley +6
We observed Comet C/Siding Spring using the Hubble Space Telescope (HST) during its close approach to Mars. The high spatial resolution images obtained through the F689M, F775W, an…
Results from the Worldwide Coma Morphology Campaign for Comet ISON (C/2012 S1)
Nalin H. Samarasinha, 48 co-authors
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 c…
A New Analysis of Spitzer Observations of Comet 29P/Schwassmann-Wachmann 1
Charles A. Schambeau, Yanga R. Fernandez, Carey M. Lisse +2
We present a new analysis of observations of comet 29P/Schwassmann-Wachmann 1 taken on UT 2003 November 21, 23, and 24, similar to a previous investigation of the o…
A Further Investigation of Apparent Periodicities and the Rotational State of Comet 103P/Hartley 2 from Combined Coma Morphology and Lightcurve Datasets
Matthew M. Knight, Beatrice E. A. Mueller, Nalin H. Samarasinha +1
We present an analysis of Kitt Peak National Observatory and Lowell Observatory observations of comet 103P/Hartley 2 obtained from August through December 2010. The results are the…
Component periods of non-principal-axis rotation and their manifestations in the lightcurves of asteroids and bare cometary nuclei
Nalin H. Samarasinha, Beatrice E. A. Mueller
Lightcurve observations of asteroids and bare cometary nuclei are the most widely used observational tool to derive the rotational parameters. Therefore, an in-depth understanding…
Constraining the Dust Coma Properties of Comet C/Siding Spring (2013 A1) at Large Heliocentric Distances
Jian-Yang Li, Nalin H. Samarasinha, Michael S. P. Kelley +5
The close encounter of Comet C/2013 A1 (Siding Spring) with Mars on October 19, 2014 presented an extremely rare opportunity to obtain the first flyby quality data of the nucleus a…
Image Enhancement Techniques for Quantitative Investigations of Morphological Features in Cometary Comae: A Comparative Study
Nalin Samarasinha, Stephen Larson
Many cometary coma features are only a few percent above the ambient coma (i.e., the background) and therefore coma enhancement techniques are needed to discern the morphological s…
Delivery of dust grains from comet C/2013 A1 (Siding Spring) to Mars
Pasquale Tricarico, Nalin H. Samarasinha, Mark V. Sykes +7
Comet C/2013 A1 (Siding Spring) will have a close encounter with Mars on October 19, 2014. We model the dynamical evolution of dust grains from the time of their ejection from the…
Relating Changes in Cometary Rotation to Activity: Current Status and Applications to Comet C/2012 S1 (ISON)
Nalin Samarasinha, Beatrice Mueller
We introduce a parameter, X, to predict the changes in the rotational period of a comet in terms of the rotational period itself, the nuclear radius, and the orbital characteristic…
Rotation of Comet Hartley 2 from Structures in the Coma
Nalin H. Samarasinha, Beatrice E. A. Mueller, Michael F. A'Hearn +2
The CN coma structure of the EPOXI mission target, comet 103P/Hartley 2, was observed during twenty nights from September to December 2010. These CN images probe the rotational sta…