J/ApJ/789/151 Properties of asteroids in comet-like orbits (Kim+, 2014)
Physical properties of asteroids in comet-like orbits in infrared asteroid
survey catalogs.
Kim Y., Ishiguro M., Usui F.
<Astrophys. J., 789, 151 (2014)>
=2014ApJ...789..151K 2014ApJ...789..151K (SIMBAD/NED BibCode)
ADC_Keywords: Minor planets ; Comets
Keywords: comets: general - minor planets, asteroids: general
Abstract:
We investigated the population of asteroids in comet-like orbits using
available asteroid size and albedo catalogs of data taken with the
Infrared Astronomical Satellite, AKARI, and the Wide-field Infrared
Survey Explorer on the basis of their orbital properties (i.e., the
Tisserand parameter with respect to Jupiter, TJ, and the aphelion
distance, Q). We found that (1) there are 123 asteroids in comet-like
orbits by our criteria (i.e., Q > 4.5 AU and TJ< 3), (2) 80% of them
have low albedo, pv< 0.1, consistent with comet nuclei, (3) the
low-albedo objects among them have a size distribution shallower than
that of active comet nuclei, that is, the power index of the
cumulative size distribution is around 1.1, and (4) unexpectedly, a
considerable number (i.e., 25 by our criteria) of asteroids in
comet-like orbits have high albedo, pv> 0.1. We noticed that such
high-albedo objects mostly consist of small (D < 3 km) bodies
distributed in near-Earth space (with perihelion distance of q < 1.3
AU). We suggest that such high-albedo, small objects were susceptible
to the Yarkovsky effect and drifted into comet-like orbits via chaotic
resonances with planets.
Description:
We used infrared asteroid databases compiled from three infrared
all-sky surveyors, the IRAS (Neugebauer et al. 1984ApJ...278L..83N 1984ApJ...278L..83N),
AKARI (Murakami et al. 2007PASJ...59S.369M 2007PASJ...59S.369M), and the Wide-field
Infrared Survey Explorer (WISE; Wright et al. 2010AJ....140.1868W 2010AJ....140.1868W).
Usui et al. (2014, J/PASJ/63/1117) compared these three infrared
asteroid catalogs with valid sizes and albedos and merged them into a
single catalog (I-A-W). They archived 138,285 asteroids with sizes
and albedos, detected with either IRAS, AKARI, or WISE in I-A-W. A
number of asteroids were detected by two or three satellites: 1993
asteroids by all three satellites, 2812 asteroids by AKARI and WISE,
and 312 asteroids by IRAS and WISE. In such cases, Usui et al.
(2014, J/PASJ/63/1117) selected data from AKARI as the highest
priority, WISE as the second, and IRAS as the third priority, although
there are no remarkable differences in the sizes and albedos among
these catalogs. AKARI data were given highest priority because its
data have less uncertainty than WISE in the sizes and albedos for the
largest asteroids. We used the I-A-W catalog in the analysis of
ACOs.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 92 123 Asteroids in Comet-like Orbits in Infrared
Asteroidal Survey Catalogs
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See also:
B/astorb : Orbits of Minor Planets (Bowell+ 2014)
J/PASJ/63/1117 : Asteroid catalog using AKARI (AcuA). V1. (Usui+, 2011)
J/AJ/151/164 : Properties of asteroids in Karin cluster (Carruba+, 2016)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 6 A6 --- Number Asteroid number
8- 20 A13 --- Name Asteroid name
22- 31 A10 --- Desig Asteroid provisional designation
33- 39 F7.3 AU a Semimajor axis
41- 45 F5.3 --- e Eccentricity
47- 52 F6.2 deg i Inclination
54- 59 F6.3 --- TJ Tisserand parameter with respect to Jupiter
61- 67 F7.3 km D Diameter
69- 74 F6.3 km e_D The uncertainty in diameter
76- 80 F5.3 --- pV Geometric albedo
82- 86 F5.3 --- e_pV The uncertainty in albedo
88- 92 A5 --- Source Observation source (1)
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Note (1): Observation source as follows :
AKARI = AKARI, 2010, Cat. II/297, II/298
IRAS = IRAS-PSC, 1986, Cat. II/125
WISE = WISE, 2012, Cat. II/311
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History:
From electronic version of the journal
(End) Prepared by [AAS], Tiphaine Pouvreau [CDS] 13-Mar-2017