свальная астростатистика

[gvard_ru]

В конце года часто подводят итоги. Давайте оставим лытдыбры в стороне и посмотрим на некоторые аспекты статистики наблюдательной астрономии.

Очередное обновление статистики центра малых планет пришлось на конец декабря. Постоянно увеличивающиеся числа впечатляют - практически 97.8 миллионов, но не объектов, а зарегистрированных наблюдений, в

Comments

[gvard_ru]

Akari (Astro-F) D=68.5 cm effective aperture, F=4.2 m. (IRAS: D=57 cm, F=5.5 m, f/9.6).
Two instruments: the Far-Infrared Surveyor (FIS; Kawada et al. 2007) for the far-infrared observations and the Infrared Camera (IRC; Onaka et al. 2007) for the near and mid-infrared wavelengths, 9-200um.
AKARI was launched on 2006 February 22. AKARI All-Sky Survey started in 2006 May and was completed in 2007 August.
The post-Helium phase (Phase 3) routine observations (only with IRC) have started on June 1st, 2008.
The operation of satellite was terminated officially on 24 November 2011.
The Akari All-Sky Survey Point Source Catalogues was released on 30 March 2010. This release consists of two infrared catalogs: the FIS Bright Source Catalogue (BSC; Yamamura et al. 2010) with 427,071 objects observed in the four far-infrared wavelengths, and the IRC Point Source Catalogue (PSC; Ishihara et al. 2010) including 870,973 objects in the two mid-infrared wavelengths. The catalog set covers more than 98% of the sky.
Note that image data of the AKARI All-Sky Survey are not yet publicly released (1107.5385).
A total of 877,091 sources (851,189 for 9um, 195,893 for 18um) are confirmed and included in the current release of the point source catalogue. The detection limit for point sources is 50mJy and 90mJy for the 9um and 18um bands, respectively. The position accuracy is estimated to be better than 2".
"Asteroid catalog using AKARI (AcuA)" is open to the public on 16 Sep. 2011.

IRAS PSC: 245,889 well-confirmed point sources, i.e., sources with angular extents less than approximately 0.5', 0.5', 1.0', and 2.0' in the in-scan direction at 12, 25, 60, and 100 µm, respectively. Typical position uncertainties are about 2" to 6" in-scan and about 8" to 16" cross-scan. Version and release date: 2.0, 1990 Sept
IRAS FSC: Faint Source Survey (FSS) is the definitive IRAS data set for faint point sources. The FSS was produced by point-source filtering the individual detector data streams and then coadding those data streams using a trimmed-average algorithm. Averaged over the whole catalog, the FSC is at least 98.5% reliable at 12 and 25 microns, and ~94% at 60 microns. For comparison, the IRAS Point Source Catalog (PSC) is > 99.997% reliable, but the sensitivity of the FSC exceeds that of the PSC by about a factor of 2.5. The FSC contains data for 173,044 point sources in unconfused regions with flux densities typically greater than 0.2 Jy at 12, 25, and 60 microns and greater than 1.0 Jy at 100 microns.
Sources with SNR > 3 but which do not meet the reliability requirements of the FSC are cataloged in the Faint Source Reject File (FSR). The FSR contains data for 593,516 sources.
Version and release date: 2.1, 1989 July 25