J/AJ/167/163 RATIR observations of 323 Near Earth Objects (Navarro-Meza+, 2024)
Taxonomy of Subkilometer Near-Earth Objects from Multiwavelength Photometry with
RATIR.
Navarro-Meza S., Trilling D.E., Mommert M., Butler N., Reyes-Ruiz M.
<Astron. J., 167, 163 (2024)>
=2024AJ....167..163N 2024AJ....167..163N
ADC_Keywords: Solar system; Minor planets; Photometry, infrared; Optical
Keywords: Near-Earth objects ; Small Solar System bodies ; Asteroids
Abstract:
We present results from observations of 238 near-Earth objects (NEOs)
obtained with the RATIR instrument on the 1.5m robotic telescope at
San Pedro Martir's National Observatory in Mexico, in the frame of our
multiobservatory, multifilter campaign. Our project is focused on
rapid response photometric observations of NEOs with absolute
magnitudes in the range 18.1-27.1 (diameter∼600 and 10m,
respectively). Data with coverage in the near-infrared and visible
range were analyzed with a nonparametric classification algorithm,
while visible-only data were independently analyzed via Monte Carlo
simulations and a 1-Nearest Neighbor method. The rapid response and
the use of spectrophotometry allows us to obtain taxonomic
classifications of subkilometer objects with small telescopes,
representing a convenient characterization strategy. We present
taxonomic classifications of the 87 objects observed in the visible
and near-infrared. We also present the taxonomic distribution of an
additional 151 objects observed in the visible. Our most accurate
method suggests a nonfeatured-to-featured ratio of ∼0.75, which is
consistent with the value found by the Mission Accessible Near-Earth
Object Survey, which conducted a similar study using a spectral
analysis. The results from the Monte Carlo method suggest a ratio of
∼0.8, although this method has some limitations. The 1-Nearest
Neighbor method showed to be not suitable for NEO classifications.
Description:
We present data taken from 2014 to 2019. Observations were performed
with the Reionization And Transients InfraRed camera (RATIR), on the
San Pedro Martir 1.5m telescope at the National Mexican Astronomical
Observatory (Observatorio Astronomico Nacional). The instrument is
equipped with two visible and two NIR detectors, all of them
2048x2048pixels. Each of these detectors corresponds to a different
channel with specific filters in the visible and NIR.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table4.dat 58 73 Observed targets analized with k-NN and a
probability of belonging to a taxonomy larger
than 50%
table5.dat 58 250 Equivalent to Table 4 for the objects which
probability of belonging to a given taxonomy is
less than 50%
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See also:
J/AJ/154/162 : KMTNet-SAAO observation of nearEarth asteroids (Erasmus+, 2017)
J/AJ/158/196 : Near-Earth Object Survey (MANOS) spectroscopy (Devogele+, 2019)
J/ApJS/247/13 : ATLAS c-o colors & classification of asteroids (Erasmus+, 2020)
Byte-by-byte Description of file: table[45].dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- ID Object identifier
12- 27 A16 --- Date Midtime of the observation; YYYY-MM-DD hh:mm
29- 31 F3.1 h Dur Observation duration
33- 36 F4.1 mag VMAG Absolute magnitude
38- 40 I3 --- P(C+X) ? Probability belonging to non-featured C and X type
42- 44 I3 --- P(Q) ? Probability belonging to unweathered rocky Q type
46- 48 I3 --- P(S) ? Probability of belonging to rocky S type
50- 52 I3 --- P(D) ? Probability of belonging to D type
54- 56 I3 --- P(V) ? Probability of belonging to V type
58- 58 I1 --- Sets [1/3] Set where this object belongs to
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History:
From electronic version of the journal
(End) Prepared by [AAS], Coralie Fix [CDS], 22-May-2024