AKARI Asteroid Flux Catalog Ver.1 - Infrared Photometric Data of Asteroids with AKARI - ================================================================================ Asteroid Catalog Using AKARI: AKARI/IRC Mid-Infrared Asteroid Survey Usui, F., Kuroda, D., Mueller, T. G., et al. =2011PASJ...63.1117U The Asteroid Catalog Using AKARI IRC Slow-Scan Observations Hasegawa, S., Mueller, T. G., Kuroda, D., et al. =2013PASJ...65...34H (25143) Itokawa: The power of radiometric techniques for the interpretation of remote thermal observations in the light of the Hayabusa rendezvous results Mueller, T. G., Hasegawa, S., and Usui, F. =2014PASJ...66...52M Hayabusa-2 Mission Target Asteroid 162173 Ryugu (1999 JU3): Searching for the Object's Spin-Axis Orientation Mueller, T. G., Durech, J., Ishiguro, M., et al. =2017A&A...599A.103M ================================================================================ ADC_Keywords: Solar system ; Minor planets ; Photometry, infrared Mission_Name: AKARI Keywords: catalogs - infrared: solar system - minor planets, asteroids - space vehicles; instruments - surveys Description: This catalog contains photometric data of 5201 asteroids observed with the infrared astronomical satellite AKARI (Murakami et al. 2007). The catalog objects comprise the near-Earth asteroids, the main belt asteroids, the Cybeles, the Hildas, and the Jovian Trojan asteroids. The observations were performed with the Infrared Camera (IRC; Onaka et al. 2007) on board AKARI by the all-sky survey in 9 or 18 um bands as well as the slow-scan observations in 9 or 18 um bands, and the pointed observations in 3, 4, 7, 11, 15, and/or 24 um bands. The all-sky survey (Usui et al. 2011) and the slow-scan observations (Hasegawa et al. 2013) detected asteroids serendipitously, while the pointed observations (Mueller et al. 2014, 2017) intentionally targeted the objects. Note that an asteroid was not observed with two or more bands simultaneously because of the alignment of the focal plane instruments or the filter operation of the detector. Data reductions were performed by the following methods: The all-sky survey: The data reduction and flux calibration were applied in the same manner as in the IRC Point Source Catalog (Ishihara et al. 2010). See Usui et al. (2011) for details. The Slow-scan observations: The IRC slow-scan observation data were reduced by the AKARI data reduction tools (Takita et al. 2012). Flux calibration is given in Hasegawa et al. (2013). See Hasegawa et al. (2013) for details. The pointed observations: The imaging data reduction toolkit was applied for data reduction (version 20070104 for (25143) Itokawa, and version 20150331 for (162173) Ryugu). Flux calibration is described in Tanabe et al. (2008). See Mueller et al. (2014, 2017) for details. See also: The Infrared Astronomical Mission AKARI Murakami, H., Baba, H., Barthel, P., et al. =2007PASJ...59S.369M The Infrared Camera (IRC) for AKARI -- Design and Imaging Performance Onaka, T., Matsuhara, H., Wada, T., et al. =2007PASJ...59S.401O Absolute Photometric Calibration of the Infrared Camera (IRC) aboard AKARI Tanabe, T., Sakon, I., Cohen, M., et al. =2008PASJ...60S.375T Albedo, Size, and Surface Characteristics of Hayabusa-2 Sample-Return Target 162173 1999 JU3 from AKARI and Subaru Observations Hasegawa, S., Mueller, T. G., Kawakami, K., et al. =2008PASJ...60S.399H The AKARI/IRC mid-infrared all-sky survey Ishihara, D., Onaka, T., Kataza, H., et al. =2010A&A...514A...1I Slow-Scan Observations with the Infrared Camera (IRC) aboard AKARI Takita, S., Ikeda, N., Kitamura, Y., et al. =2012PASJ...64..126T File Summary: -------------------------------------------------------------------------------- FileName Lrecl Records Explanations -------------------------------------------------------------------------------- ReadMe 80 . This file AST_FLUX_V1.txt 169 20780 Photometric data of asteroids -------------------------------------------------------------------------------- Byte-by-byte Description of file: AST_FLUX_V1.txt -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 6 A6 --- Number Asteroid's number 8- 23 A16 --- Name Asteroid's name 25- 34 A10 --- Prov_des Asteroid's provisional designation 36- 58 A23 --- Datetime Observation datetime (UT) 60- 70 A11 h:m:s RA Right ascension (J2000) 72- 82 A11 d:m:s Dec Declination (J2000) 84- 93 F10.6 Jy inFlux In-band flux density 95-103 F9.6 Jy e_inFlux In-band flux density uncertainty 105-114 F10.6 Jy ccFlux Color-corrected flux density (1) 116-124 F9.6 Jy e_ccFlux Color-corrected flux density uncertainty (1) 126-128 A3 um band Observed band 130-137 F8.6 au Rh Heliocentric distance 139-146 F8.6 au Delta "AKARI-centric" distance 148-152 F5.2 deg Alpha Phase angle (Sun-Target-Observer angle) 154-158 F5.2 deg Elong Elongation angle (Sun-Observer-Target angle) 160-165 A6 --- Mode Observational mode (2) 167-169 A3 --- Ref Reference (3) -------------------------------------------------------------------------------- Note (1): Differences in color between asteroids and the calibration stars (mainly K-, M-, and A-type giant stars) need to be considered, because of the wide bandwidths of observed filters. The filter profiles of the IRC are available at: http://www.ir.isas.jaxa.jp/AKARI/Observation/support/IRC/RSRF/ To obtain color-corrected monochromatic flux density, color corrections were applied which is expressed as a polynomial function of the heliocentric distance of the object. See Usui et al. (2011) for details. Note that the data of color-corrected flux density in shorter wavelength (4 um bands) may have large uncertainty due to contamination of reflected sunlight to thermal flux of asteroid. Note (2): Observational modes used for detection of asteroid are described as follows: survey: the all-sky survey IRC11,IRC51: the slow-scan observations IRC02: the pointed observations Note (3): Reference papers of the data are described as follows: U11: Asteroid Catalog Using AKARI: AKARI/IRC Mid-Infrared Asteroid Survey Usui, F., et al. 2011 H13: The Asteroid Catalog Using AKARI IRC Slow-Scan Observations Hasegawa, S., et al. 2013 M14: (25143) Itokawa: The power of radiometric techniques for the interpretation of remote thermal observations in the light of the Hayabusa rendezvous results Mueller, T. G., et al. 2014 M17: Hayabusa-2 Mission Target Asteroid 162173 Ryugu (1999 JU3): Searching for the Object's Spin-Axis Orientation Mueller, T. G., et al. 2017 -------------------------------------------------------------------------------- History: * 27-Sep-2016: Documentation prepared by Fumihiko Usui * 24-Mar-2017: Reference updated (Mueller et al. 2017) * 18-Dec-2017: Title of this ReadMe.txt updated Author's address: Fumihiko Usui, usui(at)cps-jp.org ================================================================================ (End) Fumihiko Usui [Kobe University] 24-Mar-2017