J/AJ/159/264 Observation of 10 Vesta asteroids with WISE/NEOWISE (Jiang+, 2020)
Determination of size, albedo, and thermal inertia of 10 Vesta family asteroids
with WISE/NEOWISE observations.
Jiang H., Ji J., Yu L.
<Astron. J., 159, 264 (2020)>
=2020AJ....159..264J 2020AJ....159..264J
ADC_Keywords: Minor planets; Photometry, infrared
Keywords: Main belt asteroids
Abstract:
In this work, we investigate the size, thermal inertia, surface
roughness, and geometric albedo of 10 Vesta family asteroids using the
Advanced Thermophysical Model (ATM), based on the thermal-infrared
data acquired by mainly NASA's Wide-field Infrared Survey Explorer
(WISE). Here, we show that the average thermal inertia and geometric
albedo of the investigated Vesta family members are 42J/m2/s1/2/K
and 0.314, respectively, where the derived effective diameters are
less than 10km. Moreover, the family members have a relatively low
roughness fraction on their surfaces. The similarity in thermal
inertia and geometric albedo among the V-type Vesta family members may
reveal their close connection in origin and evolution. As the
fragments of the cratering event of Vesta, the family members may have
undergone a similar evolutionary process, thereby leading to very
close thermal properties. Finally, we estimate their regolith grain
sizes with different volume filling factors.
Description:
In this work, thermal-infrared data are obtained from three
space-based telescopes: Wide-field Infrared Survey Explorer
(WISE/NEOWISE), Infrared Astronomical Satellite (IRAS), and AKARI.
WISE surveyed the sky in four wave bands (3.4, 4.6, 12.0, and
22.0µm noted as W1, W2, W3, and W4, respectively) until the solid
hydrogen cryostat (which was utilized to cool down the W3 and W4
bands) was depleted on 2010-September-30. Thereafter, the satellite
continued to work at the W1 and W2 bands, known as NEOWISE.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 82 10 Orbital and physical characteristics of the
investigated asteroids and the parameters in this
work (JD=2458600.5, from Minor Planet Center)
tablea1.dat 95 301 3-bands WISE/NEOWISE observed flux for the 10
Vesta family asteroids
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See also:
B/astorb : Orbits of Minor Planets (Bowell+ 2014)
J/A+A/498/313 : Photometry of 3 main belt asteroids (Marciniak+, 2009)
J/A+A/508/1503 : Photometry of 3 main belt asteroids (Marciniak+, 2009)
J/A+A/529/A107 : Photometry of 4 main belt asteroids (Marciniak+, 2011)
J/ApJ/741/68 : Main Belt asteroids with WISE/NEOWISE. I. (Masiero+, 2011)
J/A+A/545/A131 : Photometry of 8 main belt asteroids (Marciniak+, 2012)
J/ApJ/744/197 : WISE/NEOWISE observations of Hilda asteroids (Grav+, 2012)
J/ApJ/759/L8 : WISE/NEOWISE obs. 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 memb. (Masiero+, 2013)
J/A+A/578/A42 : Main Belt asteroids observed by Spitzer (Ryan+, 2015)
J/A+A/596/A40 : Main-belt asteroids optical light curves (Szabo+, 2016)
J/MNRAS/456/248 : (4) Vesta adopted polarimetric light curves (Cellino+, 2016)
J/AJ/156/139 : Main belt asteroid shape distrib. Gaia DR2 (Mommert+, 2018)
J/ApJS/234/37 : R-band K2 photometry of main-belt asteroids (Molnar+, 2018)
J/ApJS/237/19 : KMTNet LCs of ∼1000 main-belt asteroids (Erasmus+, 2018)
J/A+A/623/A6 : VLT/SPHERE/ZIMPOL images of Vesta (Fetick+, 2019)
J/ApJS/245/29 : Main-belt asteroid photometry from TESS (McNeill+, 2019)
J/AJ/159/25 : PS1 light curves & rotation periods, new asteroids (Lo+, 2020)
http://www.minorplanetcenter.net/iau/mpc.html : Minor planet center homepage
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 18 A18 --- Name Asteroid observed
20- 24 F5.3 au a [2.29/2.47] Semi major axis
26- 31 F6.4 --- e [0.07/0.16] Eccentricity
33- 38 F6.4 deg i [5.24/8.05] Inclination
40- 43 F4.2 yr Porb [3.48/3.87] Orbital period
45- 49 F5.2 --- MAG [7.55/14.5] Absolute magnitude
51- 54 I4 --- Nfac [1092/3192] Number of shape facets in the shape
model
56- 59 I4 --- Nver [548/1598] Number of vertices in the shape model
61- 69 A9 deg Orient Orientation
71- 76 F6.3 h Prot [2.839/11.01] Rotation period
78- 82 A5 --- SpT Spectral type
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Byte-by-byte Description of file: tablea1.dat
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Bytes Format Units Label Explanations
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1- 18 A18 --- Name Vesta family asteroid
20- 30 F11.5 d MJD [55203/57924] Modified Julian Date of observation;
JD-2400000.5
32- 40 F9.5 mJy W2 [0.07/148]? WISE band 2 flux (4.6µm)
42- 49 F8.5 mJy e_W2 [0.007/14.8]? Uncertainty in W2
51- 61 F11.5 mJy W3 [3.49/17899]? WISE band 3 flux (12µm)
63- 72 F10.5 mJy e_W3 [0.34/1790]? Uncertainty in W3
74- 84 F11.5 mJy W4 [8.77/25024]? WISE band 4 flux (22µm)
86- 95 F10.5 mJy e_W4 [0.87/2503]? Uncertainty in W4
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History:
From electronic version of the journal
(End) Prepared by [AAS], Coralie Fix [CDS], 27-Jul-2020