2009A&A...495..639G


C.D.S. - SIMBAD4 rel 1.7 - 2019.12.09CET11:45:18

2009A&A...495..639G - Astronomy and Astrophysics, volume 495, 639-646 (2009/2-4)

The brightness temperature of Mercury at mm-wavelengths.

GREVE A., THUM C., MORENO R. and YAN N.

Abstract (from CDS):

We present observations of Mercury made with the IRAM 30-m telescope at 3,2 and 1.3mm wavelength (90, 150 and 230GHz) during the years 1985-2005; we derive from these data the disk-averaged brightness temperatures. The observations at 3mm combined with those by Epstein & Andrew (1985, Icarus, 62, 448) allow a separation of the data into 40° wide longitude intervals and by this an investigation of the disk-averaged brightness temperature with Mercury's longitude. From the new mm-wavelength data, and data taken from the literature, we derive the disk-averaged brightness temperature as a function of wavelength. On Mercury's night side a significant decrease in brightness temperature occurs towards shorter wavelengths. We use the three surface models (A,B,C) discussed by Mitchell & de Pater (1994, Icarus, 110, 2) and calculate for the cool and hot surface region the corrresponding diurnal variation of the disk-averaged brightness temperature at 90GHz. For the same models we calculate the variation of the disk-averaged brightness temperature with wavelength between 1.3mm and 37mm, on Mercury's midnight side and noon side. Although the scatter in the observations is large, there seems to be a marginally better agreement with model B and A.

Abstract Copyright:

Journal keyword(s): radio continuum: solar system - planets and satellites: individual: Mercury

Simbad objects: 5

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Number of rows : 5

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 NAME W 3 OH HII 02 27 04.1 +61 52 22           ~ 930 2
2 NAME Cyg A Sy2 19 59 28.35645829 +40 44 02.0966496   16.22 15.10     ~ 2062 2
3 NAME K 3-50A HII 20 01 45.6 +33 32 42           ~ 74 0
4 NGC 7027 PN 21 07 01.8 +42 14 10   9.1 10.9     ~ 2304 1
5 NGC 7538 OpC 23 13 37 +61 30.0           ~ 816 0

    Equat.    Gal    SGal    Ecl

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2019.12.09-11:45:18

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