NEOMOD 2: An updated model of Near-Earth Objects from a decade of Catalina Sky Survey observations
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F24%3A10492054" target="_blank" >RIV/00216208:11320/24:10492054 - isvavai.cz</a>
Result on the web
<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=20wKLUIaBy" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=20wKLUIaBy</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.icarus.2023.115922" target="_blank" >10.1016/j.icarus.2023.115922</a>
Alternative languages
Result language
angličtina
Original language name
NEOMOD 2: An updated model of Near-Earth Objects from a decade of Catalina Sky Survey observations
Original language description
Catalina Sky Survey (CSS) is a major survey of Near-Earth Objects (NEOs). In a recent work, we used CSS observations from 2005-2012 to develop a new population model of NEOs (NEOMOD). CSS's G96 telescope was upgraded in 2016 and detected over 10,000 unique NEOs since then. Here we characterize the NEO detection efficiency of G96 and use G96's NEO detections from 2013-2022 to update NEOMOD. This resolves previous model inconsistencies related to the population of large NEOs. We estimate there are 936 +/- 29 NEOs with absolute magnitude H < 17.75 (diameter D >1 km for the reference albedo p(V) = 0.14) and semimajor axis a < 4.2 au. The slope of the NEO size distribution for H = 25-28 is found to be relatively shallow (cumulative index similar or equal to 2.6) and the number of H < 28 NEOs (D > 9 m for p(V) = 0.14) is determined to be (1.20 +/- 0.04) x 10(7), about 3 times lower than in Harris & Chodas (2021). Small NEOs have a different orbital distribution and higher impact probabilities than large NEOs. We estimate 0.034 +/- 0.002 impacts of H < 28 NEOs on the Earth per year, which is near the low end of the impact flux range inferred from atmospheric bolide observations. Relative to a model where all NEOs are delivered directly from the main belt, the population of small NEOs detected by G96 shows an excess of low-eccentricity orbits with a similar or equal to 1-1.6 au that appears to increase with H (similar or equal to 30% excess for H = 28). We suggest that the population of very small NEOs is boosted by tidal disruption of large NEOs during close encounters to the terrestrial planets. When the effect of tidal disruption is (approximately) accounted for in the model, we estimate 0.06 +/- 0.01 impacts of H < 28 NEOs on the Earth per year, which is more in line with the bolide data. The impact probability of a H < 22 (D > 140 m for p(V) = 0.14) object on the Earth in this millennium is estimated to be similar or equal to 4.5%.
Czech name
—
Czech description
—
Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
—
OECD FORD branch
10308 - Astronomy (including astrophysics,space science)
Result continuities
Project
<a href="/en/project/GA21-11058S" target="_blank" >GA21-11058S: Orbital and chemical evolution of emerging planetary systems</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2024
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Icarus
ISSN
0019-1035
e-ISSN
1090-2643
Volume of the periodical
411
Issue of the periodical within the volume
březen
Country of publishing house
US - UNITED STATES
Number of pages
20
Pages from-to
115922
UT code for WoS article
001140007400001
EID of the result in the Scopus database
2-s2.0-85180423182