Explanipedia

ATLAS Photometry of Interstellar Object 3I/ATLAS Open

J. Tonry, L. Denneau, M. R. Alarcón, A. Clocchiatti, A. Fitzsimmons , et al. · 2025

We present calibrated ATLAS photometry of the interstellar comet 3I/ATLAS (C/2025 N1) from 28 March through 29 Aug 2025, obtained with the five-site, robotic ATLAS network in the c (420-650~nm), o (560-820~nm), and Teide w (420-720~nm) ban…

First results ot the new ATLAS unit installed at Teide Observatory Open

J. Licandro, J. Tonry, M. R. Alarcón, Pavel Nichita, M. Serra‐Ricart , et al. · 2025

We present the first results from ATLAS-Teide, the new unit of the Asteroid Terrestrial-impact Last Alert System (ATLAS) installed by the Instituto de Astrofísica de Canarias (IAC) at the Teide Observatory (Tenerife, Spain) in January 2025…

Discovery and Preliminary Characterization of a Third Interstellar Object: 3I/ATLAS Open

Darryl Z. Seligman, M. Micheli, Davide Farnocchia, L. Denneau, John W. Noonan , et al. · 2025

We report initial observations aimed at the characterization of a third interstellar object. This object, 3I/ATLAS or C/2025 N1 (ATLAS), was discovered on 2025 July 1 UT and has an orbital eccentricity of $e\sim6.1$, perihelion of $q\sim 1…

Dust Production Rates in Jupiter-family Comets. II. Trends and Population Insights from ATLAS Photometry of 116 JFCs Open

A. Fraser Gillan, A. Fitzsimmons, L. Denneau, Robert J. Siverd, K. Smith , et al. · 2025

Jupiter-family comets (JFCs) have orbital periods of less than 20 yr and therefore undergo more frequent sublimation compared to other comet populations. The JFCs therefore represent the ideal dynamical population for investigating the dus…

The Discovery and Characterization of Earth-crossing Asteroid 2024 YR4 Open

Bryce Bolin, J. Hanuš, L. Denneau, Roberto Bonamico, Laura-May Abron , et al. · 2025

We describe observations and physical characteristics of Earth-crossing asteroid 2024 YR 4 , discovered on 2024 December 27 by the Asteroid Terrestrial-impact Last Alert System. The asteroid has semimajor axis a = 2.52 au, eccentricity e =…

ATClean: A Novel Method for Detecting Low-luminosity Transients and Application to Pre-explosion Counterparts from SN 2023ixf Open

S. Rest, A. Rest, C. D. Kilpatrick, J. Jencson, Sophie von Coelln , et al. · 2025

In an effort to search for faint sources of emission over arbitrary timescales, we present a novel method for analyzing forced photometry light curves in difference imaging from optical surveys. Our method “ATLAS Clean,” or ATClean, utiliz…

The Discovery and Characterization of Minimoon 2024 PT5 Open

Bryce Bolin, L. Denneau, Laura-May Abron, Robert Jedicke, Kristin Chiboucas , et al. · 2025

Minimoons are asteroids that become temporarily captured by the Earth–Moon system. We present the discovery of 2024 PT 5 , a minimoon discovered by the Asteroid Terrestrial-impact Last Alert System Sutherland telescope on 2024 August 7. Th…

Analyzing the Onset of Cometary Activity by the Jupiter-family Comet 2023 RN3 Open

Matthew M. Dobson, Megan E. Schwamb, A. Fitzsimmons, Michael S. P. Kelley, Carrie E. Holt , et al. · 2024

We utilize serendipitous observations from the Asteroid Terrestrial-impact Last Alert System (ATLAS) and the Zwicky Transient Facility in addition to targeted follow-up observations from the Las Cumbres Observatory (LCO) and Liverpool Tele…

The discovery and characterization of minimoon 2024 PT$_5$ Open

Bryce Bolin, L. Denneau, Laura-May Abron, Robert Jedicke, Kristin Chiboucas , et al. · 2024

Minimoons are asteroids that become temporarily captured by the Earth-Moon system. We present the discovery of 2024 PT$_5$, a minimoon discovered by the Asteroid Terrestrial-impact Last Alert System (ATLAS) Sutherland telescope on 2024 Aug…

Analysing the Onset of Cometary Activity by the Jupiter-Family Comet 2023 RN3 Open

Matthew M. Dobson, Megan E. Schwamb, A. Fitzsimmons, Michael S. P. Kelley, Carrie E. Holt , et al. · 2024

We utilize serendipitous observations from the Asteroid Terrestrial-impact Last Alert System (ATLAS) and the Zwicky Transient Facility (ZTF) in addition to targeted follow-up observations from the Las Cumbres Observatory (LCO) and Liverpoo…

The Debiased Near-Earth Object Population from ATLAS Telescopes Open

Rogerio Deienno, L. Denneau, David Nesvorný, David Vokrouhlický, W. F. Bottke , et al. · 2024

This work is dedicated to debias the Near-Earth Objects (NEO) population based on observations from the Asteroid Terrestrial-impact Last Alert System (ATLAS) telescopes. We have applied similar methods used to develop the recently released…

The Discovery and Evolution of a Possible New Epoch of Cometary Activity by the Centaur (2060) Chiron Open

Matthew M. Dobson, Megan E. Schwamb, A. Fitzsimmons, Charles Schambeau, A. J. Beck , et al. · 2024

Centaurs are small solar system objects on chaotic orbits in the giant planet region, forming an evolutionary continuum with the Kuiper Belt objects and Jupiter-family comets. Some Centaurs are known to exhibit cometary activity, though un…

Main-belt and Trojan asteroid phase curves from the ATLAS survey Open

James E. Robinson, A. Fitzsimmons, D. R. Young, Michele T. Bannister, L. Denneau , et al. · 2024

Sparse and serendipitous asteroid photometry obtained by wide field surveys such as the Asteroid Terrestrial-impact Last Alert System (ATLAS) is a valuable resource for studying the properties of large numbers of small Solar System bodies.…

GW190425: Pan-STARRS and ATLAS coverage of the skymap and limits on optical emission associated with FRB 20190425A Open

S. J. Smartt, M. Nicholl, Shubham Srivastav, M. E. Huber, K. C. Chambers , et al. · 2024

GW190425 is the second of two binary neutron star (BNS) merger events to be significantly detected by the Laser Interferometer Gravitational Wave (GW) Observatory (LIGO), Virgo and the Kamioka Gravitational Wave (KAGRA) detector network. W…

Dust Production Rates in Jupiter-family Comets: A Two Year Study withATLAS Photometry Open

A. Fraser Gillan, A. Fitzsimmons, L. Denneau, Robert J. Siverd, K. Smith , et al. · 2024

Jupiter-family comets (JFCs) exhibit a wide range of activity levels and mass loss over their orbits. We analyzed high-cadence observations of 42 active JFCs with the wide-field Asteroid Terrestrial-impact Last Alert System (ATLAS) in 2020…

Dust production rates in Jupiter-family Comets: A two-year study with ATLAS photometry Open

A. Fraser Gillan, A. Fitzsimmons, L. Denneau, Robert J. Siverd, K. Smith , et al. · 2023

Jupiter-family Comets (JFCs) exhibit a wide range of activity levels and mass-loss over their orbits. We analyzed high-cadence observations of 42 active JFCs with the wide-field Asteroid Terrestrial-impact Last Alert System (ATLAS) survey …

The Second International Asteroid Warning Network Timing Campaign: 2005 LW3 Open

Davide Farnocchia, Vishnu Reddy, J. M. Bauer, Elizabeth Warner, M. Micheli , et al. · 2023

The Earth close approach of near-Earth asteroid 2005 LW3 on 2022 November 23 represented a good opportunity for a second observing campaign to test the timing accuracy of astrometric observation. With 82 participating stations, the Interna…

GW190425: Pan-STARRS and ATLAS coverage of the skymap and limits on optical emission associated with FRB190425 Open

S. J. Smartt, M. Nicholl, Shubham Srivastav, M. E. Huber, K. C. Chambers , et al. · 2023

GW190425 is the second of only two binary neutron star (BNS) merger events to be significantly detected by the LIGO-Virgo- Kagra gravitational wave detectors. With a detection only in LIGO Livingston, the skymap containing the source was l…

Preatmospheric Detection of a Meter-sized Earth Impactor Open

David L. Clark, Paul Wiegert, Peter Brown, Denis Vida, A. Heinze , et al. · 2023

On 2020 September 18 U.S. Government (USG) sensors detected a bolide with peak bolometric magnitude of −19 over the Western Pacific. The impact was also detected by the Geostationary Lightning Mapper instrument on the GOES-17 satellite and…

Phase Curves of Kuiper Belt Objects, Centaurs, and Jupiter-family Comets from the ATLAS Survey Open

Matthew M. Dobson, Megan E. Schwamb, Susan Benecchi, A. Verbiscer, A. Fitzsimmons , et al. · 2023

The Kuiper Belt objects (KBOs), the Centaurs, and the Jupiter-family comets (JFCs) form an evolutionary continuum of small outer solar system objects, and their study allows us to gain insight into the history and evolution of the solar sy…

Phase Curves of Kuiper Belt Objects, Centaurs, and Jupiter Family Comets from the ATLAS Survey Open

Matthew M. Dobson, Megan E. Schwamb, Susan Benecchi, A. Verbiscer, A. Fitzsimmons , et al. · 2023

The Kuiper belt objects, the Centaurs, and the Jupiter-family comets form an evolutionary continuum of small outer Solar System objects, and their study allows us to gain insight into the history and evolution of the Solar System. Broadban…

ATLAS-TEIDE: The next generations of ATLAS units for the Teide Observatory Open

J. Licandro, J. Tonry, M. R. Alarcón, M. Serra‐Ricart, L. Denneau · 2023

In this work we present the design of the ATLAS unit (Asteroid Terrestrial-impact Last Alert System) that will be installed at Teide Observatory in Tenerife island (Spain). ATLAS-Teide will be built by the Instituto de Astrofisica de Canar…

Using Phase Curves from ATLAS to Search for Cometary Activity in the Solar System Open

Matthew M. Dobson, Megan E. Schwamb, Susan Benecchi, A. Verbiscer, A. Fitzsimmons , et al. · 2022

The phase curve of a small Solar System object shows the change in the object’s reflectance at different Sun-object-observer (phase) angles, and the shape of the phase curve is determined by the physical properties of th…

Investigation of Asteroid Phase Curves Extracted from the ATLAS Survey Open

James E. Robinson, A. Fitzsimmons, D. R. Young, L. Denneau, Ken R. Smith , et al. · 2022

<div class="page" title="Page 1"> <div class="layoutArea"> <div class="column"> Introduction The Asteroid Terrestrial Last-i…

ATLAS-Teide: the next generation of ATLAS units for the Teide Observatory Open

J. Licandro, J. Tonry, M. Serra‐Ricart, M. R. Alarcón, L. Denneau · 2022

Summary In this work we present the design of the ATLAS (Asteroid Terrestrial-impact Last Alert System) unit that will be installed at Teide Observatory in Tenerife island (Spain). A…

Preatmospheric detection of a meter-sized Earth impactor Open

David L. Clark, Paul Wiegert, Peter Brown, Denis Vida, A. Heinze , et al. · 2022

On 2020 September 18 US Government sensors detected a bolide with peak bolometric magnitude of -19 over the western Pacific. The impact was also detected by the Geostationary Lightning Mapper (GLM) instrument on the GOES-17 satellite and i…

Apophis Planetary Defense Campaign Open

V. Reddy, Michael S. P. Kelley, Jessie Dotson, Davide Farnocchia, Nicolas Erasmus , et al. · 2022

We describe results of a planetary defense exercise conducted during the close approach to Earth by the near-Earth asteroid (99942) Apophis during 2020 December–2021 March. The planetary defense community has been conducting observational …

Erratum: “Beyond Gaia: Asteroseismic Distances of M giants using Ground-Based Transient Surveys” (2020, AJ, 5 160, 18) Open

Connor Auge, Daniel Huber, A. Heinze, B. J. Shappee, J. Tonry , et al. · 2022

Possible Activity in 468861 (2013 LU28) Open

Lily A. Slemp, K. J. Meech, Erica Bufanda, Jan Kleyna, O. Hainaut , et al. · 2022

Manx comets are objects on long-period comet orbits that are inactive as they approach perihelion. They are of particular interest because they may help constrain solar system formation models. 2013 LU28 was discovered as an inactive aster…

Physical Characterization of Main-belt Comet (248370) 2005 QN173 Open

Henry H. Hsieh, Colin Orion Chandler, L. Denneau, A. Fitzsimmons, Nicolas Erasmus , et al. · 2021

We report results from new and archival observations of the newly discovered active asteroid (248370) 2005 QN 173 (also now designated Comet 433P), which has been determined to be a likely main-belt comet based on a subsequent discovery th…

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