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J/ApJ/791/121        NIR albedos of main-belt asteroids         (Masiero+, 2014)

Main-belt asteroids with WISE/NEOWISE: near-infrared albedos. Masiero J.R., Grav T., Mainzer A.K., Nugent C.R., Bauer J.M., Stevenson R., Sonnett S. <Astrophys. J., 791, 121 (2014)> =2014ApJ...791..121M (SIMBAD/NED BibCode)
ADC_Keywords: Minor planets Keywords: minor planets, asteroids: general Abstract: We present revised near-infrared albedo fits of 2835 main-belt asteroids observed by WISE/NEOWISE over the course of its fully cryogenic survey in 2010. These fits are derived from reflected-light near-infrared images taken simultaneously with thermal emission measurements, allowing for more accurate measurements of the near-infrared albedos than is possible for visible albedo measurements. Because our sample requires reflected light measurements, it undersamples small, low-albedo asteroids, as well as those with blue spectral slopes across the wavelengths investigated. We find that the main belt separates into three distinct groups of 6%, 16%, and 40% reflectance at 3.4 µm. Conversely, the 4.6 µm albedo distribution spans the full range of possible values with no clear grouping. Asteroid families show a narrow distribution of 3.4 µm albedos within each family that map to one of the three observed groupings, with the (221) Eos family being the sole family associated with the 16% reflectance 3.4 µm albedo group. We show that near-infrared albedos derived from simultaneous thermal emission and reflected light measurements are important indicators of asteroid taxonomy and can identify interesting targets for spectroscopic follow-up. Description: To fit for NIR albedos of main-belt asteroids, we use data from the WISE/NEOWISE all-sky single exposure source table, which are available for download from the Infrared Science Archive (IRSA, ; Cutri et al. 2012, xplanatory Supplement to the WISE All-Sky Data Release Products, We extract photometric measurements of all asteroids observed by WISE following the technique described in Masiero et al. (2011, J/ApJ/741/68) and Mainzer et al. (2011ApJ...731...53M). In particular, we use the NEOWISE observations reported to the MPC and included in the MPC's minor planet observation database as the final validated list of reliable NEOWISE detections of solar system objects. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 74 3080 Revised thermal fits of Main Belt asteroids
See also: J/ApJ/741/68 : Main Belt asteroids with WISE/NEOWISE. I. (Masiero+, 2011) J/ApJ/770/7 : WISE/NEOWISE Main Belt asteroids: family members (Masiero+, 2013) J/A+A/578/A42 : Main Belt asteroids observed by Spitzer (Ryan+, 2015) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 5 A5 --- Name Asteroid number, MPC-packed format 7- 12 F6.2 km Dia Diameter 14- 18 F5.2 km e_Dia Uncertainty in Dia 20- 23 F4.2 --- eta Beaming parameter 25- 28 F4.2 --- e_eta Uncertainty in eta 30- 33 F4.2 --- pV Visible albedo 35- 38 F4.2 --- e_pV Uncertainty in pV 40- 43 F4.2 --- pW1 WISE 3.4 micron band albedo 45- 48 F4.2 --- e_pW1 Uncertainty in pW1 50- 53 F4.2 --- pW2 ? WISE 4.5 micron band albedo (1) 55- 58 F4.2 --- e_pW2 ? Uncertainty in pW2 60- 63 F4.1 mag HVMag Absolute HV magnitude 65- 68 F4.2 --- G Photometric slope parameter 70- 74 I5 --- Family ? Associated family identifier from Masiero et al. (2013, J/ApJ/770/7) (2)
Note (1): Null if pW2 can not be constrained. Note (2): Null if the object is not associated to a family.
History: From electronic version of the journal
(End) Prepared by [AAS], Tiphaine Pouvreau [CDS] 04-Apr-2017
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