J/A+A/688/A50 Binary asteroid cand. in Gaia DR3 astrometry (Liberato, 2024)
Binary asteroid candidates in Gaia DR3 astrometry.
Liberato L., Tanga P., Mary D., Minker K., Carry B., Spoto F., Bartczak P.,
Sicardy B., Oszkiewicz D., Desmars J.
<Astron. Astrophys. 688, A50 (2024)>
=2024A&A...688A..50L 2024A&A...688A..50L (SIMBAD/NED BibCode)
ADC_Keywords: Minor planets ; Positional data
Keywords: methods and techniques - methods: statistical -
astronomical databases: miscellaneous - astrometry -
minor planets, asteroids: general
Abstract:
Asteroids with companions constitute an excellent sample for studying
the collisional and dynamical evolution of minor planets. The
currently known binary population were discovered by different
complementary techniques that produce, for the moment, a strongly
biased distribution, especially in a range of intermediate asteroid
sizes (∼20 to 100km) where both mutual photometric events and
high-resolution adaptive optic imaging are poorly efficient.
A totally independent technique of binary asteroid discovery, based on
astrometry, can help to reveal new binary systems and populate a range
of sizes and separations that remain nearly unexplored.
In this work, we describe a dedicated period detection method and its
results for the Gaia DR3 data set. This method looks for the presence
of a periodic signature in the orbit post-fit residuals.
After conservative filtering and validation based on statistical and
physical criteria, we are able to present a first sample of
astrometric binary candidates, to be confirmed by other observation
techniques such as photometric light curves and stellar occultations.
Description:
This list contains the 362 solutions for 358 objects selected as
binary candidates.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 183 361 Estimated parameters for the Gaia astrometric
asteroid binary candidates
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See also:
I/359 : Gaia DR3 Part 5: Solar System
Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 6 I6 --- MPC MPC id number (ID)
8- 14 F7.3 h Per Wobble period estimate (Wobble_Period)
16- 21 F6.2 h e_Per ? 95% confidence interval in the wobble
period estimate (ErrorwobblePeriod)
23- 28 F6.2 mas Amp ? Wobble amplitude estimate
(Wobble_amplitude)
30- 35 F6.2 mas e_Amp ? 95% confidence interval in the wobble
amplitude estimate (Errorwobbleamplitude)
37- 44 F8.4 km Sep1 ? Estimated mean separation between the
primary and the secondary based on the
first interval of mass ratio estimated
(Separation-1st_int)
46- 53 F8.4 km e_Sep1 ? Uncertainty in the estimated separation of
the first interval (Errorsepn-1stint)
55- 62 F8.4 --- Massratio1 ? Mean value of the first interval of mass
ratio estimate (Massratio-1stint)
64- 71 F8.4 --- e_Massratio1 ? Uncertainty in the mass ratio estimate of
the first interval (Errormratio-1stint)
73- 82 F10.4 km Sep2 ? Estimated mean separation between the
primary and the secondary based on the
second interval of mass ratio estimated
(Separation-2nd_int)
84- 93 F10.4 km e_Sep2 ? Uncertainty in the estimated separation of
the second interval (Errorsepn-2ndint)
95-102 F8.4 --- Massratio2 ? Mean value of the second interval of
mass ratio estimate (Massratio-2ndint)
104-111 F8.4 --- e_Massratio2 ? Uncertainty in the mass ratio estimate of
the second interval (Errormratio-2ndint)
113 I1 --- fTaxonomy [0/1]? Flag to identify candidates in which
the parameters were obtained taking into
account the taxonomic class (1=True)
(Flag_taxonomy)
115 I1 --- fSNR [0/1]? Flag to identify the best candidates
with S/N>1 (1=True) (Flag_SNR)
117 I1 --- fDoubleSol [0/1]? Flag to identify the candidates with
two different solutions (1=True)
(FlagDoublesolution)
119-183 A65 --- Comment Comment on the data (Comment)
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Acknowledgements:
Luana Liberato, luana.liberato(at)oca.eu
(End) Patricia Vannier [CDS] 13-Jun-2024