J/AJ/156/60 Thermal model fits for short-arc NEOs with NEOWISE (Masiero+, 2018)
Small and nearby NEOs observed by NEOWISE during the first three years
of survey: physical properties.
Masiero J.R., Redwing E., Mainzer A.K., Bauer J.M., Cutri R.M., Grav T.,
Kramer E., Nugent C.R., Sonnett S., Wright E.L.
<Astron. J., 156, 60-60 (2018)>
=2018AJ....156...60M 2018AJ....156...60M (SIMBAD/NED BibCode)
ADC_Keywords: Solar system ; Minor planets ; Photometry, infrared ; Morphology ;
Surveys
Keywords: minor planets, asteroids: general
Abstract:
Automated asteroid detection routines set requirements on the number
of detections, signal-to-noise ratio, and the linearity of the expected
motion in order to balance completeness, reliability, and time delay
after data acquisition when identifying moving object tracklets.
However, when the full-frame data from a survey are archived, they can
be searched later for asteroids that were below the initial detection
thresholds. We have conducted such a search of the first three years
of the reactivated Near-Earth Object Wide-field Infrared Survey
Explorer data, looking for near-Earth objects discovered by ground-based
surveys that have previously unreported thermal infrared data. Using
these measurements, we can then perform thermal modeling to measure
the diameters and albedos of these objects. We present new physical
properties for 116 Near-Earth Objects found in this search.
Description:
We used the Solar System Object search tool provided by the NASA/IPAC
Infrared Science Archive (IRSA) in the WISE image server
(http://irsa.ipac.caltech.edu/applications/wise/) to determine
the predicted locations for all NEOs with provisional designations
assigned from the start of 2014 to the end of 2016 for which detections
had not already been reported by NEOWISE. This tool uses the spacecraft
position as well as the propagated orbit of the asteroid from JPL
Horizons (http://ssd.jpl.nasa.gov/horizons.cgi) to determine if the object
was coincident with any recorded NEOWISE image at the time that image
was acquired. Our search included both bands acquired by the NEOWISE
survey: 3.4 µm (W1) and 4.6 µm (W2). For objects detected in both
bands, we require that the object has an NEO-like color (i.e., W1-W2>1 mag,
as opposed to stars that usually have a color of W1-W2∼0). We detect
33 asteroids in a single NEOWISE exposure set and 89 in multiple exposures,
for a total of 354 visually confirmed detections of 122 NEOs.
We use the Near-Earth Asteroid Thermal Model (NEATM, Harris
1998Icar..131..291H 1998Icar..131..291H) to determine the physical properties of the observed
NEOs, following the process and selection criteria described in our
previous work (e.g., Nugent et al. 2015, J/ApJ/814/117; 2016, J/AJ/152/63;
Masiero et al. 2017, J/AJ/154/168).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 76 116 Thermal model fits for short-arc NEOs observed
in the first three years of the NEOWISE
reactivation survey
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See also:
J/ApJ/743/156 : NEOWISE observations of NEOs: preliminary results
(Mainzer+, 2011)
J/ApJ/760/L12 : WISE/NEOWISE NEOs preliminary thermal fits (Mainzer+, 2012)
J/ApJ/784/110 : NEOWISE observations of 105 near-Earth objects (Mainzer+, 2014)
J/ApJ/814/117 : NEOWISE Reactivation mission: 1st yr data (Nugent+, 2015)
J/AJ/152/63 : NEOWISE reactivation mission: 2nd yr data (Nugent+, 2016)
J/AJ/154/168 : NEOWISE: thermal model fits for NEOs and MBAs (Masiero+, 2017)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 7 A7 --- Name Name in Minor Planet Center-packed (MPC) format
9- 13 F5.2 mag HMag [18.7/26.8] Absolute visual magnitude
15- 18 F4.2 --- G [0.15/0.15] Photometric slope parameter
20- 24 F5.3 km Diam [0.008/1.403] Diameter
26- 30 F5.3 km e_Diam [0.002/0.23] Uncertainty in Diam
32- 36 F5.3 km Dcorr [0.007/1.305] Phase-corrected diameter using
the equations from Mommert et al.
(2018AJ....155...74M 2018AJ....155...74M)
38- 42 F5.2 [-] logpV [-1.99/-0.23] Log of the visible-light albedo
44- 47 F4.2 [-] e_logpV [0.08/0.57] Uncertainty in logpV
49- 53 F5.2 [-] logpVcor [-1.89/-0.1] Phase-corrected visible-light
albedo using the equations from Mommert et al.
(2018AJ....155...74M 2018AJ....155...74M)
55- 58 F4.2 --- Beam [0.54/3.14] Beaming parameter η
60- 63 F4.2 --- e_Beam [0.06/1] Uncertainty in Beam
65 I1 --- NW1 [0/7] Number of detections in the W1 bandpass
67- 68 I2 --- NW2 [1/13] Number of detections in the W2 bandpass
70- 74 F5.2 deg Phase [52.31/90.16] Phase angle
76 I1 --- Fitted [0/1]? Fitted beaming flag (1)
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Note (1): Flag as follows:
1 = If the beaming parameter was fitted during the Near-Earth Asteroid Thermal
Model (NEATM, Harris 1998Icar..131..291H 1998Icar..131..291H) modeling;
0 = If an assumed value was used.
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History:
From electronic version of the journal
(End) Tiphaine Pouvreau [CDS] 29-Jan-2019