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J/AJ/154/168    NEOWISE: thermal model fits for NEOs and MBAs   (Masiero+, 2017)

NEOWISE reactivation mission year three: asteroid diameters and albedos. Masiero J.R., Nugent C., Mainzer A.K., Wright E.L., Bauer J.M., Cutri R.M., Grav T., Kramer E., Sonnett S. <Astron. J., 154, 168 (2017)> =2017AJ....154..168M (SIMBAD/NED BibCode)
ADC_Keywords: Solar system ; Minor planets ; Photometry, infrared ; Morphology ; Surveys Keywords: minor planets, asteroids: general Abstract: The Near-Earth ObjectWide-field Infrared Survey Explorer (NEOWISE) reactivation mission has completed its third year of surveying the sky in the thermal infrared for near-Earth asteroids and comets. NEOWISE collects simultaneous observations at 3.4 and 4.6 µm of solar system objects passing through its field of regard. These data allow for the determination of total thermal emission from bodies in the inner solar system, and thus the sizes of these objects. In this paper, we present thermal model fits of asteroid diameters for 170 NEOs and 6110 Main Belt asteroids (MBAs) detected during the third year of the survey, as well as the associated optical geometric albedos. We compare our results with previous thermal model results from NEOWISE for overlapping sample sets, as well as diameters determined through other independent methods, and find that our diameter measurements for NEOs agree to within 26% (1σ) of previously measured values. Diameters for the MBAs are within 17% (1σ). This brings the total number of unique near-Earth objects characterized by the NEOWISE survey to 541, surpassing the number observed during the fully cryogenic mission in 2010. Description: The NEOWISE telescope uses beamsplitters and co-aligned detectors to simultaneously image the same 47'x47' area of sky onto two focal plane detectors with sensitivities centered at 3.4 and 4.6 µm. Each detector records the incident flux for 7.7 s exposures, followed by an ∼2 s slew of the scan mirror that keeps the image stationary on the detectors during exposures. Exposures are separated by 11 s, and have an ∼10% overlap in the scan direction. The nominal survey pattern results in most detections of moving objects being spaced ∼3 hr apart over an ∼30 hr period. We extracted all detections from NEOWISE (observatory code C51) recorded in the MPC's Observations Catalog (http://minorplanetcenter.net/iau/ECS/MPCAT-OBS/MPCAT-OBS.html) with observation dates between 2015 December 13 00:00 UT and 2016 December 12 23:59:59 UT. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 74 202 Thermal model fits for NEOs in the third year of the NEOWISE survey table2.dat 74 6877 Thermal model fits for MBAs in the third year of the NEOWISE survey
See also: J/ApJ/741/68 : Main Belt asteroids with WISE/NEOWISE. I. (Masiero+, 2011) J/ApJ/742/40 : Jovian Trojans asteroids with WISE/NEOWISE (Grav+, 2011) J/ApJ/743/156 : NEOWISE observations of NEOs: preliminary results (Mainzer+, 2011) J/ApJ/744/197 : WISE/NEOWISE observations of Hilda asteroids (Grav+, 2012) J/ApJ/759/L8 : WISE/NEOWISE observations of main belt asteroids (Masiero+, 2012) J/ApJ/760/L12 : WISE/NEOWISE NEOs preliminary thermal fits (Mainzer+, 2012) J/ApJ/770/7 : WISE/NEOWISE Main Belt asteroids: family members (Masiero+, 2013) J/ApJ/791/121 : NIR albedos of main-belt asteroids (Masiero+, 2014) J/ApJ/792/30 : NEOWISE magnitudes for 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) http://minorplanetcenter.net/ : IAU Minor Planet Center home page Byte-by-byte Description of file: table1.dat table2.dat
Bytes Format Units Label Explanations
1- 7 A7 --- Name Object identifier (1) 9- 13 F5.2 mag HMag [6.74/25.2] Absolute visual magnitude (2) 15- 19 F5.2 --- G [-0.27/0.82] Photometric slope parameter 21- 27 F7.3 km Diam [0.086/216.061] Diameter 29- 34 F6.3 km e_Diam [0.002/72.296] Uncertainty in Diam 36- 41 F6.3 [-] logpV [-1.964/-0.112] Log of the visible albedo 43- 47 F5.3 [-] e_logpV [0.023/0.603] Uncertainty in logpV 49- 53 F5.3 --- eta [0.3/2.724] Beaming parameter η 55- 59 F5.3 --- e_eta [0/0.605] Uncertainty in eta 61- 62 I2 --- NW1 [0/92] Number of unsaturated W1 band observations (3) 64- 66 I3 --- NW2 [4/104] Number of unsaturated W2 band observations (3) 68- 72 F5.2 deg Phase [16.32/84.34] Phase angle 74 A1 --- Fitted [0/1] Fitted beaming? (4)
Note (1): In packed Minor Planet Center (MPC) format. Objects listed multiple times were observed at multiple epochs and fit separately. Note (2): 1 AU away and 1 AU from Sun at zero phase angle. Note (3): Used for fitting. Note (4): Fitted beaming flag as follows: 1 = Beaming was a fitted parameter; 0 = In case of an assumed value.
History: From electronic version of the journal
(End) Prepared by [AAS], Tiphaine Pouvreau [CDS] 12-Jul-2018
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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