J/ApJ/814/117 NEOWISE Reactivation mission: 1st yr data (Nugent+, 2015)
NEOWISE Reactivation mission year one: preliminary asteroid diameters and
albedos.
Nugent C.R., Mainzer A., Masiero J., Bauer J., Cutri R.M., Grav T.,
Kramer E., Sonnett S., Stevenson R., Wright E.L.
<Astrophys. J., 814, 117 (2015)>
=2015ApJ...814..117N 2015ApJ...814..117N (SIMBAD/NED BibCode)
ADC_Keywords: Minor planets ; Photometry, infrared ; Surveys
Keywords: minor planets, asteroids: general
Abstract:
We present preliminary diameters and albedos for 7956 asteroids
detected in the first year of the NEOWISE Reactivation mission. Of
those, 201 are near-Earth asteroids and 7755 are Main Belt or
Mars-crossing asteroids. 17% of these objects have not been previously
characterized using the Near-Earth Object Wide-field Infrared Survey
Explorer, or "NEOWISE" thermal measurements. Diameters are determined
to an accuracy of ∼20% or better. If good-quality H magnitudes are
available, albedos can be determined to within ∼40% or better.
Description:
Here, we expand the number of asteroids characterized by NEOWISE
(Mainzer et al. 2011ApJ...731...53M 2011ApJ...731...53M), deriving diameters and albedos
for asteroids detected by NEOWISE between 2013 December 13 and 2014
December 13 during the first year of the Reactivation mission. The
NEOWISE mission uses the Wide-field Infrared Survey Explorer (WISE)
spacecraft.
The calibrated images and the database of positions and fluxes of
sources extracted from images for the first year of NEOWISE survey
observations were released in 2015 March (Cutri et al. 2015;
http://wise2.ipac.caltech.edu/docs/release/neowise/expsup/).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 51 3360 NEOWISE Year 1 Reactivation observations of
near-Earth asteroids (NEAs)
table2.dat 72 205 Measured diameters and albedos of near-Earth objects
not previously characterized using NEOWISE data
table3.dat 72 34 Measured diameters and albedos of near-Earth objects
with previously reported measurements by the NEOWISE
team
table4.dat 77 1246 Measured diameters and albedos of main-belt asteroid
(MBA) and Mars crossing asteroids without previously
reported measurements by the NEOWISE team
table5.dat 77 7516 Measured diameters and albedos of MBA and Mars
crossing asteroids with previously reported
measurements by the NEOWISE team
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See also:
B/astorb : Orbits of Minor Planets (Bowell+ 2014)
II/190 : IRAS Minor Planet Survey (IMPS) (Tedesco 1992)
VII/108 : Asteroids II Machine-Readable Data Base (Binzel+ 1987)
VII/91 : IRAS Asteroid and Comet Survey (Veeder+ 1986)
J/MNRAS/433/2075 : Asteroid families identification (Carruba+, 2013)
J/ApJ/770/7 : WISE/NEOWISE Main Belt asteroids (Masiero+, 2013)
J/ApJ/760/L12 : WISE/NEOWISE NEOs preliminary thermal fits (Mainzer+, 2012)
J/ApJ/759/L8 : WISE/NEOWISE obs. of main belt asteroids (Masiero+, 2012)
J/ApJ/759/49 : Jovian Trojan asteroids with WISE/NEOWISE (Grav+, 2012)
J/ApJ/744/197 : WISE/NEOWISE observations of Hilda asteroids (Grav+, 2012)
J/ApJ/743/156 : NEOWISE obs. of NEOs: preliminary results (Mainzer+, 2011)
J/ApJ/742/40 : Jovian Trojans asteroids with WISE/NEOWISE (Grav+, 2011)
J/ApJ/741/68 : Main Belt asteroids with WISE/NEOWISE. I. (Masiero+, 2011)
http://irsa.ipac.caltech.edu/Missions/wise.html : IRSA - WISE home page
http://wise2.ipac.caltech.edu/docs/release/neowise/expsup/ : Exoplanetory
supplement to NEOWISE
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 7 A7 --- MPC Asteroid name, in MPC packed format
9- 21 F13.7 --- MJD [56652.9/57003.3] Modified Julian Date
23 A1 --- l_W1mag Upper limit flag on W1mag (1)
24- 29 F6.3 mag W1mag [11.8/17.3]? WISE 3.4um (W1) magnitude
31- 36 F6.3 mag e_W1mag [0.01/0.6]? Uncertainty on W1mag
38- 43 F6.3 mag W2mag [8.7/14.8] WISE 4.6um (W2) magnitude
45- 49 F5.3 mag e_W2mag [0.01/0.4] Uncertainty on W2mag
51 I1 arcsec Ap [0] Aperture photometry radius (2)
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Note (1): ">" indicates that the magnitude is a 95% confidence limit;
Cutri et al. 2012wise.rept....1C
Note (2): An aperture radius of "0" indicates that the pipeline profile fit
photometry was used.
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Byte-by-byte Description of file: table[23].dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- Name Asteroid number or provisional name
12- 18 A7 --- MPC Asteroid name, in MPC packed format
20- 24 F5.2 mag HMag [12.6/23.5] Absolute H band magnitude
26- 29 F4.2 --- G [0.09/0.2] Slope parameter
31- 34 F4.2 km Diam [0.09/9.6] Diameter
36- 39 F4.2 km e_Diam [0.01/5.3] Uncertainty in Diam
41- 44 F4.2 --- pV [0.01/0.7] Visible geometric albedo
46- 49 F4.2 --- e_pV [0/0.3] Uncertainty in pV
51- 54 F4.2 --- eta [0.7/1.4] Beaming parameter, η
56- 59 F4.2 --- e_eta [0/0.7] Uncertainty in η
61- 64 F4.2 mag W2amp [0.07/1.8] Amplitude of the WISE 4.6um (W2)
light curve
66- 68 I3 --- N1 [0/171] Number of WISE 3.4um (W1) band observations
70- 72 I3 --- N2 [4/172] Number of WISE 4.6um (W2) band observations
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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 --- Name Asteroid number or provisional name
12- 18 A7 --- MPC Asteroid name, in MPC packed format
20- 24 F5.2 mag HMag [6.6/19.2] Absolute H band magnitude
26- 30 F5.2 --- G [-0.06/0.4] Slope parameter
32- 37 F6.2 km Diam [0.5/277] Diameter
39- 43 F5.2 km e_Diam [0.1/82] Uncertainty in Diam
45- 48 F4.2 --- pV [0.01/0.7]? Visible geometric albedo
50- 53 F4.2 --- e_pV [0.01/0.3]? Uncertainty in pV
55- 58 F4.2 --- eta [0.95] Beaming parameter, η
60- 63 F4.2 --- e_eta [0.1/0.4] Uncertainty in η
65- 68 F4.2 mag W2amp [0.02/4.3] Amplitude of the WISE 4.6um (W2)
light curve
70- 71 I2 --- N1 [0/54] Number of WISE 3.4um (W1) band observations
73- 74 I2 --- N2 [4/57] Number of WISE 4.6um (W2) band observations
76- 77 I2 --- q_Diam [0/1] Quality of diameter fits (1)
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Note (1): Quality of diameter fits as follows:
0 = fit quality nominal.
1 = fits could not reproduce optical magnitudes for a realistic range
of albedos.
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 01-Mar-2016