J/ApJS/274/25 Orbits for 1.25 million main-belt asteroids (Nesvorny+, 2024)
Catalog of proper orbits for 1.25 million main-belt asteroids and discovery of
136 new collisional families.
Nesvorny D., Roig F., Vokrouhlicky D., Broz M.
<Astrophys. J. Suppl. Ser., 274, 25 (2024)>
=2024ApJS..274...25N 2024ApJS..274...25N
ADC_Keywords: Minor planets; Magnitudes, absolute
Keywords: Asteroid dynamics ; Collision physics ; Hirayama families
Abstract:
The proper elements of asteroids are obtained from the instantaneous
orbital elements by removing periodic oscillations produced by
gravitational interactions with planets. They are unchanged in time,
at least if chaotic dynamics and nongravitational forces could be
ignored, and can therefore be used to identify fragments of major
collisions (asteroid families) that happened eons ago. Here we present
a new catalog of proper elements for 1.25x106 main-belt asteroids.
We explain the methodology, evaluate uncertainties, and discuss how
the new catalog can be used to identify asteroid families. A
systematic search for families yielded 153 cases not reported in
Nesvorny+ 2015aste.book..297N 2015aste.book..297N -- 17 of these cases were identified in
various other publications, and 136 cases are new discoveries. There
are now 274 families in the asteroid belt in total (plus a handful of
families in the resonant Hilda population). We analyzed several
compact families in detail. The new family around the middle-belt
asteroid (9332) 1990SB1 (nine members) is the youngest family found so
far (estimated formation only 16-17kyr ago). The new families
(1217) Maximiliana, (6084) Bascom, (10164) Akusekijima, and
(70208) 1999RX33 all formed 0.5-2.5Myr ago. The (2110) Moore-Sitterly
family is a close pair of relatively large bodies, 2110 and 44612, and
15 small members all located sunward from 2110 and 44612, presumably a
consequence of the Yarkovsky drift over the estimated family age
(1.2-1.5Myr). A systematic characterization of the new asteroid
families is left for future work.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 107 1249051 *Full proper element catalog
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Note on table2.dat: Also available at
http://asteroids.on.br/appeal/elements.html
This version has:
DATE OF LAST COMPUTATION: March 20, 2024
DATE OF OSCULATION: September 13, 2023
NEXT PROGRAMMED UPDATE: March, 2025
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See also:
B/astorb : Orbits of Minor Planets (Bowell+, 2014-)
J/ApJ/770/7 : WISE/NEOWISE Main Belt asteroids (Masiero+, 2013)
J/ApJ/814/117 : NEOWISE Reactivation mission: 1st yr data (Nugent+, 2015)
J/AJ/152/54 : Sp. of main-belt Ch/Cgh-type asteroids (Vernazza+, 2016)
J/AJ/156/139 : Main belt asteroid shape distrib. from Gaia (Mommert+, 2018)
J/A+A/638/A84 : PACS obs. of large main-belt asteroids (Ali-Lagoa+, 2020)
J/AJ/166/152 : Main Belt Asteroid Rotation from TESS (McNeill+, 2023)
J/A+A/681/A23 : Very young asteroid families (Vokrouhlicky+, 2024)
J/A+A/682/A64 : Primordial S-type family catalogue (Bourdelle de Micas+, 2024)
http://pds.nasa.gov/ : NASA Planetary Data System (PDS) homepage
http://www.minorplanetcenter.net/ : IAU Minor Planet Center (MPC)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 8 F8.6 AU ap [0.89/3.76] Proper semimajor axis
10- 17 E8.2 AU e_ap [3.9e-10/0.66] RMS error of ap
19- 26 F8.6 --- ep [0.0018/0.77] Proper eccentricity
28- 35 E8.2 --- e_ep [4.5e-09/0.3] RMS error of ep
37- 44 F8.6 --- sinIp [0.0005/0.91] Sine of proper inclination
46- 53 E8.2 --- e_sinIp [4.8e-10/0.26] RMS error of sinIp
55- 65 F11.6 arcsec/yr g [-999.83/999.93] Proper frequency of
perihelion longitude
67- 77 F11.6 arcsec/yr s [-315.18/-6.64] Proper frequency of nodal
longitude
79- 84 F6.3 mag HMag [0/99.99] Absolute magnitude H (1)
86- 88 I3 --- Nop [1/123] Number of oppositions (1)
90- 96 A7 --- MPC Name of asteroid, packed (1)
98- 107 A10 --- uMPC Name of asteroid, unpacked
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Note (1): From MPC Database as of March 20, 2024.
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 21-Jan-2025