Article
Geochemistry & Geophysics
Yuxian Yue, Jiancen Liu, Xiaohui Wang
Summary: This paper proposes a thermal model for the comet surface considering the sublimation of water ice and presents a method for solving the sublimation rate using infrared spectroscopy. The results show that sublimation exists in most areas of the comet surface, with most of the water production coming from the comet nucleus. According to the sublimation law, the estimated sublimation temperature of water ice on 103P is above 180 K, indicating that the water ice may sublimate underneath the surface.
JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS
(2023)
Article
Astronomy & Astrophysics
Marcin Wesolowski
Summary: This paper presents three processes related to the dynamics of cometary particles: quiet sublimation, emission of cometary matter via jet, and migration of particles on the surface of the comet 103P/Hartley. These processes help determine factors such as maximum particle size, emission angle, and maximum width for particle movement in different belts. Factors like coefficient of friction and particle structure are crucial in understanding the activity of comet 103P/Hartley.
RESEARCH IN ASTRONOMY AND ASTROPHYSICS
(2021)
Article
Engineering, Aerospace
Michael W. Werner, Patrick J. Lowrance, Tom Roellig, Varoujan Gorjian, Joseph Hunt, C. Matt Bradford, Jessica Krick
Summary: The Spitzer Space Telescope operated for over 16 years, providing valuable scientific and engineering data for future mission planners. The radiative cooling demonstrated by Spitzer has been adopted by other infrared space missions.
JOURNAL OF ASTRONOMICAL TELESCOPES INSTRUMENTS AND SYSTEMS
(2022)
Article
Astronomy & Astrophysics
Richard G. Arendt, Martha L. Boyer, Eli Dwek, Mikako Matsuura, Aravind P. Ravi, Armin Rest, Roger Chevalier, Phil Cigan, Ilse De Looze, Guido De Marchi, Claes Fransson, Christa Gall, R. D. Gehrz, Haley L. Gomez, Tuomas Kangas, Florian Kirchschlager, Robert P. Kirshner, Josefin Larsson, Peter Lundqvist, Dan Milisavljevic, Sangwook Park, Nathan Smith, Jason Spyromilio, Tea Temim, Lifan Wang, J. Craig Wheeler, Charles E. Woodward
Summary: JWST NIRCam observations provide detailed imaging of the evolving remnant of SN 1987A, confirming that the emission arises from the circumstellar equatorial ring (ER) and that the brightness can be accurately predicted. The observations also reveal that much of the emission comes from a newly developing outer portion of the ER, with spots lying at position angles in between the well-known hotspots.
ASTROPHYSICAL JOURNAL
(2023)
Article
Astronomy & Astrophysics
Vadim Abramkin, Yuriy Shibanov, Roberto P. Mignani, George G. Pavlov
Summary: The study presents optical-UV observations of the 200 million-year-old rotation-powered radio pulsar J0108-1431. A potential candidate for the far-UV pulsar counterpart was identified, and the pulsar's optical-UV spectrum was examined based on the detection.
ASTROPHYSICAL JOURNAL
(2021)
Article
Astronomy & Astrophysics
A. Moneti, H. J. McCracken, M. Shuntov, O. B. Kauffmann, P. Capak, I Davidzon, O. Ilbert, C. Scarlata, S. Toft, J. Weaver, R. Chary, J. Cuby, A. L. Faisst, D. C. Masters, C. McPartland, B. Mobasher, D. B. Sanders, R. Scaramella, D. Stern, I Szapudi, H. Teplitz, L. Zalesky, A. Amara, N. Auricchio, C. Bodendorf, D. Bonino, E. Branchini, S. Brau-Nogue, M. Brescia, J. Brinchmann, V Capobianco, C. Carbone, J. Carretero, F. J. Castander, M. Castellano, S. Cavuoti, A. Cimatti, R. Cledassou, G. Congedo, C. J. Conselice, L. Conversi, Y. Copin, L. Corcione, A. Costille, M. Cropper, A. Da Silva, H. Degaudenzi, M. Douspis, F. Dubath, C. A. J. Duncan, X. Dupac, S. Dusini, S. Farrens, S. Ferriol, P. Fosalba, M. Frailis, E. Franceschi, M. Fumana, B. Garilli, B. Gillis, C. Giocoli, B. R. Granett, A. Grazian, F. Grupp, S. V. H. Haugan, H. Hoekstra, W. Holmes, F. Hormuth, P. Hudelot, K. Jahnke, S. Kermiche, A. Kiessling, M. Kilbinger, T. Kitching, R. Kohley, M. Kuemmel, M. Kunz, H. Kurki-Suonio, S. Ligori, P. B. Lilje, I Lloro, E. Maiorano, O. Mansutti, O. Marggraf, K. Markovic, F. Marulli, R. Massey, S. Maurogordato, M. Meneghetti, E. Merlin, G. Meylan, M. Moresco, L. Moscardini, E. Munari, S. M. Niemi, C. Padilla, S. Paltani, F. Pasian, K. Pedersen, S. Pires, M. Poncet, L. Popa, L. Pozzetti, F. Raison, R. Rebolo, J. Rhodes, H. Rix, M. Roncarelli, E. Rossetti, R. Saglia, P. Schneider, A. Secroun, G. Seidel, S. Serrano, C. Sirignano, G. Sirri, L. Stanco, P. Tallada-Crespi, A. N. Taylor, I Tereno, R. Toledo-Moreo, F. Torradeflot, Y. Wang, N. Welikala, J. Weller, G. Zamorani, J. Zoubian, S. Andreon, S. Bardelli, S. Camera, J. Gracia-Carpio, E. Medinaceli, S. Mei, G. Polenta, E. Romelli, F. Sureau, M. Tenti, T. Vassallo, A. Zacchei, E. Zucca, C. Baccigalupi, A. Balaguera-Antolinez, F. Bernardeau, A. Biviano, M. Bolzonella, E. Bozzo, C. Burigana, R. Cabanac, A. Cappi, C. S. Carvalho, S. Casas, G. Castignani, C. Colodro-Conde, J. Coupon, H. M. Courtois, D. Di Ferdinando, M. Farina, F. Finelli, P. Flose-Reimberg, S. Fotopoulou, S. Galeotta, K. Ganga, J. Garcia-Bellido, E. Gaztanaga, G. Gozaliasl, I Hook, B. Joachimi, V Kansal, E. Keihanen, C. C. Kirkpatrick, V Lindholm, G. Mainetti, D. Maino, R. Maoli, M. Martinelli, N. Martinet, M. Maturi, R. B. Metcalf, G. Morgante, N. Morisset, A. Nucita, L. Patrizii, D. Potter, A. Renzi, G. Riccio, A. G. Sanchez, D. Sapone, M. Schirmer, M. Schultheis, V Scottez, E. Sefusatti, R. Teyssier, O. Tubio, I Tutusaus, J. Valiviita, M. Viel, H. Hildebrandt
Summary: This study presents a new infrared survey using the Spitzer Space Telescope's IRAC to observe the Euclid deep fields and calibration fields. The resulting mosaics are the deepest possible, covering a large area with precise astrometry and photometric calibration. With the decommissioning of the Spitzer Space Telescope, these mosaics are likely to be the definitive reduction of the IRAC data, making them an essential first step in assembling multi-wavelength data for future extragalactic astronomy research.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
Sandor Kruk, Pablo Garcia-Martin, Marcel Popescu, Ben Aussel, Steven Dillmann, Megan E. Perks, Tamina Lund, Bruno Merin, Ross Thomson, Samet Karadag, Mark J. McCaughrean
Summary: The recent launch of low Earth orbit satellite constellations is posing a growing threat to ground-based astronomical observations, causing concerns among the astronomical community. By analyzing Hubble Space Telescope images from 2002 to 2021 with the help of citizen scientists and a deep learning algorithm, we found that 2.7% of the individual exposures were contaminated by satellite trails, and this fraction is expected to increase with the growing number of artificial satellites in the next decade. Further study and monitoring are needed to address this issue.
Article
Astronomy & Astrophysics
Jeffrey L. Carlin, Burcin Mutlu-Pakdil, Denija Crnojevic, Christopher T. Garling, Ananthan Karunakaran, Annika H. G. Peter, Erik Tollerud, Duncan A. Forbes, Jonathan R. Hargis, Sungsoon Lim, Aaron J. Romanowsky, David J. Sand, Kristine Spekkens, Jay Strader
Summary: In this study, two dwarf galaxies in the halos of Large Magellanic Cloud (LMC) analogs were examined using deep Hubble Space Telescope (HST) imaging, revealing their structural parameters and stellar populations. One of the dwarfs showed recent star formation while the other contained mostly ancient, metal-poor stars. These faint dwarf satellites are among the faintest known around host galaxies of LMC mass, and their census will contribute to testing predictions from cold dark matter models and understanding the influence of low-mass hosts on the evolution of satellites.
ASTROPHYSICAL JOURNAL
(2021)
Article
Geosciences, Multidisciplinary
Joachim Saur, Stefan Duling, Alexandre Wennmacher, Clarissa Willmes, Lorenz Roth, Darrell F. Strobel, Frederic Allegrini, Fran Bagenal, Scott J. Bolton, Bertrand Bonfond, George Clark, Randy Gladstone, Thomas K. Greathouse, Denis C. Grodent, Candice J. Hansen, William S. Kurth, Glenn S. Orton, Kurt D. Retherford, Abigail M. Rymer, Ali H. Sulaiman
Summary: This study presents the results of Hubble Space Telescope observations taken around the flyby of the Juno spacecraft on 7 June 2021 from Ganymede's orbitally trailing side. It is found that Ganymede's northern and southern auroral ovals alternate in brightness, with the oval facing Jupiter's magnetospheric plasma sheet being brighter. This suggests that the generator powering Ganymede's aurora is the momentum of the Jovian plasma sheet north and south of Ganymede's magnetosphere.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Astronomy & Astrophysics
Qasim Afghan, Geraint H. Jones, Oliver Price, Andrew Coates
Summary: Cometary dust tails exhibit various structures, most of which are believed to be caused by factors such as variable dust production and interactions with the solar wind. However, not all of these structures have been fully understood. This study reports the discovery of a peculiar dust tail feature, where a section of the tail is missing. This suggests a temporary decrease in dust production near perihelion.
Article
Astronomy & Astrophysics
Dylan Keating, Nicolas B. Cowan
Summary: The field of exoplanet atmospheric characterization is moving towards comparative studies involving many planetary systems, and using Bayesian hierarchical modelling is a natural next step. Research demonstrates that hierarchical modelling provides better quantification of observational data variability, and offers tighter constraints, especially suitable for comparative studies involving multiple planets.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
T. M. Bania, Dana S. Balser
Summary: The study used the Green Bank Telescope to search for He-3(+) emission in four Galactic planetary nebulae and found discrepancies in the He-3/H abundance ratios compared to H ii regions across the Milky Way. The inability to detect He-3(+) emission questions the validity of previous reports in any planetary nebula and suggests the presence of an extra mixing process in low-mass stars to explain the observed results.
ASTROPHYSICAL JOURNAL
(2021)
Article
Astronomy & Astrophysics
N. Bonaventura, P. Jakobsen, P. Ferruit, S. Arribas, G. Giardino
Summary: The eMPT software suite is developed to assist astronomers in planning optimized, multi-object spectroscopic observations with the Near-Infrared Spectrograph on the James Webb Space Telescope. It provides a range of algorithms and capabilities to make the observation planning more flexible and customizable.
ASTRONOMY & ASTROPHYSICS
(2023)
Article
Astronomy & Astrophysics
Rui Xu, Dicong Liang, Lijing Shao
Summary: We present novel static spherical black hole solutions in the bumblebee gravity model, where the vector nonminimally couples to the Ricci curvature tensor, extending the Einstein-Maxwell theory. By testing these solutions in the strong-field regime using recent observations of supermassive black hole shadows in M87 and the Milky Way, we find that the parameter space is largely unexcluded, indicating the need for further experiments to fully constrain the theory.
ASTROPHYSICAL JOURNAL
(2023)
Article
Astronomy & Astrophysics
V Kokorev, G. Brammer, S. Fujimoto, K. Kohno, G. E. Magdis, F. Valentino, S. Toft, P. Oesch, I Davidzon, F. E. Bauer, D. Coe, E. Egami, M. Oguri, M. Ouchi, M. Postman, J. Richard, J-B Jolly, K. K. Knudsen, F. Sun, J. R. Weaver, Y. Ao, A. J. Baker, L. Bradley, K. Caputi, M. Dessauges-Zavadsky, D. Espada, B. Hatsukade, A. M. Koekemoer, A. M. Munoz Arancibia, K. Shimasaku, H. Umehata, T. Wang, W-H Wang
Summary: We present a set of multiwavelength mosaics and photometric catalogs in the ALMA lensing cluster survey fields. The catalogs were built by reprocessing archival data from the Hubble Space Telescope and Spitzer Infrared Array Camera. These data will serve as an important tool in aiding the search for submillimeter galaxies and follow-ups of dark and high-z sources, and provide insights into the Epoch of Reionization and formation of the first galaxies.
ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES
(2022)
Article
Astronomy & Astrophysics
Enrique Lopez-Rodriguez, Alejandro S. Borlaff, Rainer Beck, William T. Reach, Sui Ann Mao, Evangelia Ntormousi, Konstantinos Tassis, Sergio Martin-Alvarez, Susan E. Clark, Daniel A. Dale, Ignacio del Moral-Castro
Summary: This study characterizes the morphology of the ordered magnetic fields in the interstellar medium (ISM) of the closest merging spiral galaxies, the Antennae galaxies. It reveals that the 154 μm magnetic fields are more ordered than the 11 cm magnetic fields. The turbulent-to-ordered 154 μm magnetic field increases at the galaxy cores and star-forming regions. It suggests that the amplified magnetic fields may support the gas flow between the galaxies and the tidal tail.
ASTROPHYSICAL JOURNAL LETTERS
(2023)
Article
Astronomy & Astrophysics
Jason C. Cook, Silvia Protopapa, Cristina M. Dalle Ore, Dale P. Cruikshank, William M. Grundy, Carey M. Lisse, Bernard Schmitt, Anne Verbiscer, Kelsi N. Singer, John Spencer, S. Alan Stern, Harold A. Weaver
Summary: In this study, we examined the 2.21-mu m band of Charon using data obtained by New Horizons/LEISA. We found no significant variation in this band as Charon rotates. The 2.21-mu m band on Charon is several times weaker than on other moons, and we attribute it to NH4Cl based on the appearance of a weaker band at 2.24-mu m. Additionally, we observed two never-before-reported absorption features in Charon's spectrum at 1.60 and 1.63-mu m, which may also be explained by the presence of NH4Cl. If NH3-H2O ice mixtures are present on Charon, they must be a small fraction of the overall composition.
Article
Astronomy & Astrophysics
Lea Ferellec, Colin Snodgrass, Alan Fitzsimmons, Agata Rozek, Daniel Gardener, Richard Smith, Hissa Medeiros, Cyrielle Opitom, Henry H. Hsieh
Summary: Main Belt Comets (MBCs) show sublimation-driven activity while orbiting in the Main Asteroid Belt. MBCs and candidates exhibit a higher concentration of perihelion longitudes around 15 degrees compared to other objects in the Outer Main Belt (OMB). This characteristic may aid in the discovery of new candidates by observing objects in similar orbits.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Michael L. Sitko, Ray W. W. Russell, Zachary C. C. Long, Korash Assani, Monika Pikhartova, Ammar Bayyari, Carol A. A. Grady, Carey M. M. Lisse, Massimo Marengo, John P. P. Wisniewski, William C. C. Danchi
Summary: This study examines the internight variability of K2-discovered dippers using the SpeX spectrograph. The properties of the dust in these dippers differ from the diffuse interstellar medium and molecular clouds, but resemble those seen in the disks of young stellar objects.
ASTRONOMICAL JOURNAL
(2023)
Article
Astronomy & Astrophysics
Nguyen Fuda, Le Ngoc Tram, William T. Reach
Summary: Molecular emission from SNR-molecular cloud interactions provides a tool for studying star formation and cosmic-ray production. CO emission, created by magnetohydrodynamic shock, is an effective tracer for slow-moving shocks into the inner clumps. In this study, a new theoretical framework is presented for predicting CO line profiles using the Paris-Durham 1D shock model.
ASTROPHYSICAL JOURNAL
(2023)
Article
Astronomy & Astrophysics
Teresa Symons, Michael Zemcov, Asantha Cooray, Carey Lisse, Andrew R. Poppe
Summary: Direct photometric measurements of the cosmic optical background (COB) provide a point of comparison for other measurement methodologies and models of cosmic structure formation, and allow for a cosmic consistency test to reveal additional sources of emission. However, measuring the COB from Earth has been challenging due to interference from scattered light in our solar system. In this study, data from the Long-Range Reconnaissance Imager on NASA's New Horizons mission was used to measure the COB, with the analysis accounting for various instrumental systematics and astrophysical foregrounds. The results suggest a higher light intensity than expected, calling for further measurements with more advanced instruments.
ASTROPHYSICAL JOURNAL
(2023)
Article
Astronomy & Astrophysics
Stefano Bagnulo, Zuri Gray, Mikael Granvik, Alberto Cellino, Ludmilla Kolokolova, Karri Muinonen, Olga Munoz, Cyrielle Opitom, Antti Penttila, Colin Snodgrass
Summary: We studied the Didymos-Dimorphos binary asteroid in spectropolarimetric mode to understand the characteristics of the ejected dust before and after the DART impact. Prior to impact, Didymos showed an increasing linear polarization with phase angle, reaching about 5% in the blue and 4.5% in the red. The polarization spectrum was anticorrelated with the reflectance spectrum, indicating it was an S-class asteroid. After impact, the level of polarization slightly decreased in both the blue and red bands, but continued to increase linearly with phase angle, similar to the measurements before impact. The lack of significant change in the polarization spectrum suggests that the wavelength dependence of polarization depends on the composition of the scattering material rather than its structure.
ASTROPHYSICAL JOURNAL LETTERS
(2023)
Article
Astronomy & Astrophysics
Megan E. Schwamb, R. Lynne Jones, Peter Yoachim, Kathryn Volk, Rosemary C. Dorsey, Cyrielle Opitom, Sarah Greenstreet, Tim Lister, Colin Snodgrass, Bryce T. Bolin, Laura Inno, Michele T. Bannister, Siegfried Eggl, Michael Solontoi, Michael S. P. Kelley, Mario Juric, Hsing Wen Lin, Darin Ragozzine, Pedro H. Bernardinelli, Steven R. Chesley, Tansu Daylan, Josef Durech, Wesley C. Fraser, Mikael Granvik, Matthew M. Knight, Carey M. Lisse, Renu Malhotra, William J. Oldroyd, Audrey Thirouin, Quanzhi Ye
Summary: The Vera C. Rubin Observatory is preparing for the Legacy Survey of Space and Time (LSST) in 2025, aiming to transform our understanding of the solar system by discovering and monitoring over five million small bodies. The LSST survey strategy plays a crucial role in the discovery and characterization of solar system minor planets and passing interstellar objects. To optimize the LSST survey strategy, a series of operation simulations have been conducted to explore different observing parameters and priorities. The impact of these simulated LSST observing strategies on studying the solar system's small body reservoirs has been examined, highlighting the importance of maximizing LSST solar system science.
ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES
(2023)
Article
Astronomy & Astrophysics
J. A. Sinclair, C. M. Lisse, G. S. Orton, M. Krishnamoorthy, L. N. Fletcher, J. Hora, C. Palotai, T. Hayward
Summary: We retrospectively analyzed Earth-based mid-infrared observations of Jupiter after its impacts by SL9 in July 1994 and the Wesley impactor in July 2009, using consistent data reduction and analysis methods. The SL9 impacts resulted in enhanced CH4 emissions at 7.9 μm and NH3 emissions at 8.5-11.5 μm, while the Wesley impact exhibited enhanced emissions at 8.8-11.5 μm and 18-19 μm. The different composition and altitude of the impacts indicate deeper penetration for SL9, with NH3 abundances about 40 times higher than in the Wesley impact. The absence of silicates in the Wesley impact suggests a different incident angle and entry angle for the impactor.
Article
Astronomy & Astrophysics
A. Donaldson, R. Kokotanekova, A. Rozek, C. Snodgrass, D. Gardener, S. F. Green, N. Masoumzadeh, J. Robinson
Summary: This study reports new r-band nucleus light curves for comet 162P/Siding Spring, obtained in 2018, 2021, and 2022. A convex shape model of the nucleus is created by convex lightcurve inversion, suggesting a possible bilobed structure. A linear phase function and brightness interpolation for the nucleus are derived after correcting the light curves for rotational effects. Challenges associated with modelling comet nucleus shapes from light curves are highlighted, and the potential role of the Legacy Survey of Space and Time in alleviating these challenges is discussed.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
A. Arredondo, C. I. Honniball, P. G. Lucey, W. T. Reach, E. R. Malaret, A. Thorpe
Summary: The Lunar Legacy Project aims to detect and characterize the distribution of water on the Moon's surface using the 6 μm spectral band. Spectra were obtained from the Faint Object Infrared Camera for the SOFIA Telescope instrument between 2018 and 2022. This paper explains the necessary processing steps, including the use of the SOFIA Redux package and Python scripts written by the team, to reduce the raw data and create flux-calibrated spectra.
PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC
(2023)
Review
Astronomy & Astrophysics
P. C. Brandt, E. Provornikova, S. D. Bale, A. Cocoros, R. DeMajistre, K. Dialynas, H. A. Elliott, S. Eriksson, B. Fields, A. Galli, M. E. Hill, M. Horanyi, T. Horbury, S. Hunziker, P. Kollmann, J. Kinnison, G. Fountain, S. M. Krimigis, W. S. Kurth, J. Linsky, C. M. Lisse, K. E. Mandt, W. Magnes, R. L. McNutt, J. Miller, E. Moebius, P. Mostafavi, M. Opher, L. Paxton, F. Plaschke, A. R. Poppe, E. C. Roelof, K. Runyon, S. Redfield, N. Schwadron, V. Sterken, P. Swaczyna, J. Szalay, D. Turner, H. Vannier, R. Wimmer-Schweingruber, P. Wurz, E. J. Zirnstein
Summary: This article provides a detailed overview of the knowledge gaps in our understanding of the interaction between the heliosphere and the largely unexplored Very Local Interstellar Medium (VLISM), as well as predictions of potential scientific discoveries in this field. The article discusses the new measurements needed to make progress in space physics, including in-situ plasma and pick-up ion measurements, direct sampling of VLISM properties, and remote imaging to discern the heliospheric shape and interaction with interstellar hydrogen. A 4-year NASA funded mission study reports the implementation of a pragmatic Interstellar Probe mission with a nominal design life of reaching 375 Astronomical Units (au), with likely operation out to 550 au.
SPACE SCIENCE REVIEWS
(2023)
Article
Astronomy & Astrophysics
William T. Reach, Paul G. Lucey, Casey I. Honniball, Anicia Arredondo, Erick R. Malaret
Summary: The presence of water on the lunar surface is determined by the input and production of water through solar wind and meteoroid bombardment, as well as photodestruction and mobility across the surface. Using the Stratospheric Observatory for Infrared Astronomy (SOFIA), we observed variations in the distribution of water on the lunar nearside surface, with drier conditions at +28 degrees longitude and wetter conditions at -7 degrees longitude, decreasing towards the poles. Significant local enhancements were found in south-facing, high-altitude topographic features, including wet ridges, crater rims, and permanently shadowed polar regions.
PLANETARY SCIENCE JOURNAL
(2023)
Article
Engineering, Aerospace
Greg Pass, Dan Goods, Pilar Fatas, Apoorv Khandelwal, Michael Skvarla, Noriaki Nakayamada, Karen Meech, Sonia Hernandez, Evan Hilgemann
Summary: This proof-of-concept presents a 21st century artwork that represents the evolution of human identity through the use of selfies. The artwork, called the Altamira Comet, aims to gather selfies from individuals around the world and create microscopic bust sculptures that will be launched into heliocentric orbit. The concept involves using advanced technological processes to fabricate each selfie sculpture the size of cosmic dust. Plans are also discussed to deploy the comet using a standard CubeSat deployer and eventually expand the participation to reach at least one billion global participants.
Article
Astronomy & Astrophysics
L. Dover, S. C. Lowry, A. Rozek, B. Rozitis, S. L. Jackson, T. Zegmott, Yu N. Krugly, I. N. Belskaya, A. Fitzsimmons, S. F. Green, C. Snodgrass, P. R. Weissman, M. Brozovic, L. A. M. Benner, M. W. Busch, V. R. Ayvazian, V Chiorny, R. Ya Inasaridze, M. Krugov, S. Mykhailova, I Reva, J. Hibbert
Summary: This study presents a physical model and spin-state analysis of the potentially hazardous asteroid (23187) 2000 PN9. By collecting optical light curves and utilizing planetary radar data, a detailed shape model was developed to search for YORP acceleration. The results suggest that 2000 PN9 is a relatively large top-shaped body with a short sidereal rotation period. Although no evidence for rotational acceleration was found, the presence of small YORP torques cannot be ruled out. It is likely that 2000 PN9 is an object that has undergone YORP evolution.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)