J/ApJ/809/92 Asteroids in GALEX (Waszczak+, 2015)
Asteroids in GALEX: near-ultraviolet photometry of the major taxonomic groups.
Waszczak A., Ofek E.O., Kulkarni S.R.
<Astrophys. J., 809, 92 (2015)>
=2015ApJ...809...92W 2015ApJ...809...92W (SIMBAD/NED BibCode)
ADC_Keywords: Minor planets ; Photometry, ultraviolet
Keywords: minor planets, asteroids: general; surveys
Abstract:
We present ultraviolet (UV) photometry (near-UV (NUV) band, 180-280nm)
of 405 asteroids observed serendipitously by GALEX from 2003 to 2012.
All asteroids in this sample were detected by GALEX at least twice.
Unambiguous visible-color-based taxonomic labels (C type versus S
type) exist for 315 of these asteroids; of these,
thermal-infrared-based diameters are available for 245. We derive
NUV-V color using two independent models to predict the visual
magnitude V at each NUV-detection epoch. Both V models produce NUV-V
distributions in which the S types are redder than C types with more
than 8σ confidence. This confirms that the S types' redder
spectral slopes in the visible remain redder than the C types' into
the NUV, this redness being consistent with absorption by
silica-containing rocks. The GALEX asteroid data confirm earlier
results from the International Ultraviolet Explorer, which two decades
ago produced the only other sizeable set of UV asteroid photometry.
The GALEX-derived NUV-V data also agree with previously published
Hubble Space Telescope (HST) UV observations of asteroids 21 Lutetia
and 1 Ceres. Both the HST and GALEX data indicate that NUV band is
less useful than u band for distinguishing subgroups within the
greater population of visible-color-defined C types (notably, M types
and G types).
Description:
We extracted a total of 1342 positive NUV detections of 405 unique
asteroids which were detected by GALEX (images available from the
Space Telescope Science Institute) at least twice (and no FUV
detections, as expected). See section 2 for further explanations.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 87 1342 Observations of 405 asteroids detected in
GALEX NUV images
--------------------------------------------------------------------------------
See also:
B/astorb : Orbits of Minor Planets (Bowell+ 2014)
II/312 : GALEX-DR5 (GR5) sources from AIS and MIS (Bianchi+ 2011)
J/AJ/150/75 : Asteroid light curves from PTF survey (Waszczak+, 2015)
J/ApJ/749/10 : SDSS observations of Kuiper belt objects (Ofek, 2012)
J/ApJ/741/68 : Main Belt asteroids with WISE/NEOWISE. I. (Masiero+, 2011)
J/PASJ/63/1117 : Asteroid catalog using AKARI (AcuA). V1. (Usui+, 2011)
http://minorplanetcenter.net/ : Minor Planet Center (MPC) home page
http://www.ptf.caltech.edu/ : Palomar Transient Factory (PTF) home page
http://galex.stsci.edu/GR6/ : GALEX STSci home page
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 5 I5 --- astNum [1/51217] Asteroid number; IAU designation
7- 22 A16 "Y/M/D" Date UT date of exposure midpoint
24- 32 F9.5 deg RAdeg Right ascension in decimal degrees (J2000)
34- 42 F9.5 deg DEdeg Declination in decimal degrees (J2000)
44- 46 F3.1 arcsec posRes [0/2] Position residual; predicted vs detected
position
48- 52 F5.2 mag NUVmag [14.3/22.5] GALEX/NUV band magnitude
54- 57 F4.2 mag e_NUVmag [0/0.2] Uncertainty in NUVmag
59- 62 F4.1 mag Vpred [7.8/21] Predicted visual magnitude from MPC
model
64- 67 I4 s tExp [30/1707] Exposure time of GALEX image
69- 87 I19 --- objID Unique ID of detection in CasJobs GALEX
database
--------------------------------------------------------------------------------
History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 10-Dec-2015