J/ApJS/247/13 ATLAS c-o colors and classification of asteroids (Erasmus+, 2020)
Investigating taxonomic diversity within asteroid families through
ATLAS dual-band photometry.
Erasmus N., Navarro-Meza S., McNeill A., Trilling D.E., Sickafoose A.A.,
Denneau L., Flewelling H., Heinze A., Tonry J.L.
<Astrophys. J. Suppl. Ser., 247, 13 (2020)>
=2020ApJS..247...13E 2020ApJS..247...13E
ADC_Keywords: Minor planets; Colors; Optical; Photometry
Keywords: Main belt asteroids; Asteroids; Broad band photometry; Sky surveys;
Minor planets; Small solar system bodies; Lomb-Scargle periodogram;
Period determination; Light curves
Abstract:
We present here the c-o colors for identified Flora, Vesta,
Nysa-Polana, Themis, and Koronis family members within the historic
data set (2015-2018) of the Asteroid Terrestrial-impact Last Alert
System (ATLAS). The Themis and Koronis families are known to be
relatively pure C- and S-type Bus-DeMeo taxonomic families,
respectively, and the extracted color data from the ATLAS broadband c-
and o-filters of these two families are used to demonstrate that the
ATLAS c-o color is a sufficient parameter to distinguish between the
C- and S-type taxonomies. The Vesta and Nysa-Polana families are known
to display a mixture of taxonomies possibly due to Vesta's
differentiated parent body origin and Nysa-Polana actually consisting
of two nested families with differing taxonomies. Our data show that
the Flora family also displays a large degree of taxonomic mixing and
the data reveal a substantial H-magnitude dependence on color. We
propose and exclude several interpretations for the observed taxonomic
mix. Additionally, we extract rotation periods of all of the targets
reported here and find good agreement with targets that have
previously reported periods.
Description:
Observations were performed between 2015 and 2018 by the Asteroid
Terrestrial-impact Last Alert System (ATLAS). The two current ATLAS
units, both located in Hawaii, are 0.5m telescopes each covering
30deg2 field-of-view in a single exposure; they scan the complete
visible northern sky every night.
The main survey mode mostly utilizes two custom filters, a "cyan" or
c-filter with a bandpass between 420 and 650nm and an "orange" or
o-filter with a bandpass between 560 and 820nm.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 90 1612 The Asteroid Terrestrial-impact Last Alert System
(ATLAS) colors, extracted rotation periods, and
taxonomic probabilities
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See also:
B/astorb : Orbits of Minor Planets (Bowell+, 2014)
J/ApJS/237/19 : KMTNet LCs of ∼1000 main-belt asteroids (Erasmus+, 2018)
J/AJ/156/241 : Variable stars measured by ATLAS (Heinze+, 2018)
J/ApJS/242/15 : VRI photometry & taxonomy for ≳2000 MBAs (Erasmus+, 2019)
http://www.minorplanet.info/lightcurvedatabase.html : Asteroid LC database
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- Seq [1/1612] Internal identifier
6- 11 I6 --- Planet Asteroid number
13- 39 A27 --- Name Target name
41- 51 A11 --- Family Family identifier
53- 56 F4.1 mag Hmag [9.0/17.5] H magnitude (1)
58- 61 F4.2 mag c-o [0.09/0.62] ATLAS broadband (c-o) color index
63- 66 F4.2 mag e_c-o [0.04/0.17] Uncertainty in c-o
68- 74 F7.3 h Prot [2.476/164.598] Rotation period
76- 80 F5.3 h e_Prot [0.0/0.475] Uncertainty in Prot
82- 83 I2 % Conf [52/96] Confidence
85- 86 I2 % C-type [0/98] C-Type probability
88- 90 I3 % S-type [2/100] S-Type probability
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Note (1): Obtained from http://ssd.jpl.nasa.gov/horizons.cgi
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 27-Apr-2020