J/AJ/142/120 104 large asteroids mass determination studies (Zielenbach, 2011)
Mass determination studies of 104 large asteroids.
Zielenbach W.
<Astron. J., 142, 120 (2011)>
=2011AJ....142..120Z 2011AJ....142..120Z
ADC_Keywords: Minor planets ; Morphology
Keywords: minor planets, asteroids: general
Abstract:
The techniques described in an earlier paper were used to determine
masses of 104 asteroids by the method of asteroid-asteroid
gravitational interaction. For each of the 104 perturbers, 4 large
sets of test particles selected by different criteria were used to
calculate 4 mass values from a weighted mean of individual results
within each set.
Description:
None of the 104 perturbers being studied was used as a test asteroid,
since each of them had non-zero nominal masses. Excluding them ensured
that no other perturber's mass determination would be degraded by
uncertainties in the non-zero mass of the given test asteroid.
Referring to the test asteroids as test particles instead of test
bodies reinforces this distinction. Test particles are asteroids with
an assumed mass of zero.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 43 104 Taxonomic class, triaxial ellipsoid diameters,
and uncertainty
table1.dat 284 832 Historical mass determinations and those from
this study
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See also:
B/astorb : Orbits of Minor Planets (Bowell+ 2012)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Num Asteroid number
5- 16 A12 --- Name Asteroid name
18- 20 A3 --- Class Taxonomic class (1)
22- 26 F5.1 km adiam Ellipsoid a diameter
28- 32 F5.1 km bdiam Ellipsoid b diameter
34- 38 F5.1 km cdiam Ellipsoid c diameter
40- 43 F4.1 km sigma Error on diameters
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Note (1): From Neese, 2010, Asteroid Taxonomy V6.0, EAR-A-5-DDR-TAXONOMY-v6.0
NASA Planetary Data System, (http://sbn.psi.edu/pds/resource/taxonomy.html
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Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Num Asteroid number
5 A1 --- r_Num [ib] origin of values (1)
7- 18 A12 --- Name Asteroid name
20- 26 F7.3 10-12Msun Mass [-64/670] Asteroid mass (2)
28- 34 F7.3 10-12Msun e_Mass ? Uncertainty in Mass
36- 40 I5 --- Cand ? Candidates (number of test particles used in
asteroid-asteroid interaction determinations)
42- 48 F7.2 --- Sig ? Significance
50- 55 F6.2 g/cm3 Den [-16/334] Density (2)
57- 62 F6.2 g/cm3 e_Den [-16/207]? Uncertainty in Den (2)
64-284 A221 --- Ref Reference
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Note (1): Flag as follows:
i = All values determined from natural satellites of the perturber.
b = All values that the author would use for follow-up studies.
Note (2): unrealistic negative masses (and densities and their errors)
can result from the analysis (discussed by Zielenbach 2010AJ....139..816Z 2010AJ....139..816Z
and in section 3.3 of the paper)
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 28-Nov-2012