The Chandra X-ray Observatory is the U.S. follow-on to the Einstein
Observatory. Chandra was formerly known as AXAF, the Advanced X-ray
Astrophysics Facility, but renamed by NASA in December, 1998.
Originally three instruments and a high-resolution mirror carried in
one spacecraft, the project was reworked in 1992 and 1993. The Chandra
spacecraft carries a high resolution mirror, two imaging detectors,
and two sets of transmission gratings. Important Chandra features are:
an order of magnitude improvement in spatial resolution, good
sensitivity from 0.1 to 10 keV, and the capability for high spectral
resolution observations over most of this range.
The Chandra X-ray Observatory is the U.S. follow-on to the Einstein
Observatory. Chandra was formerly known as AXAF, the Advanced X-ray
Astrophysics Facility, but renamed by NASA in December, 1998.
Originally three instruments and a high-resolution mirror carried in
one spacecraft, the project was reworked in 1992 and 1993. The Chandra
spacecraft carries a high resolution mirror, two imaging detectors,
and two sets of transmission gratings. Important Chandra features are:
an order of magnitude improvement in spatial resolution, good
sensitivity from 0.1 to 10 keV, and the capability for high spectral
resolution observations over most of this range.
The First Byurakan Survey (FBS) is the largest and the first systematic objective prism survey of the extragalactic sky. It covers 17,000 sq.deg. in the Northern sky together with a high galactic latitudes region in the Southern sky. The FBS has been carried out by B.E. Markarian, V.A. Lipovetski and J.A. Stepanian in 1965-1980 with the Byurakan Observatory 102/132/213 cm (40"/52"/84") Schmidt telescope using 1.5 deg. prism. Each FBS plate contains low-dispersion spectra of some 15,000-20,000 objects; the whole survey consists of about 20,000,000 objects.
Measurements of comet Halley in the spectral channel of IKS on board
the Vega-1 spacecraft. Data are retrieved from the PDS Small Bodies
Node data set (2011 reformatted version) and updated. The data set
consists in 101 tables providing the radiance spectrum of comet Halley
from various distances, plus two composite spectra. For details and
further references, see: Combes M. et al., 1988, The 2.5-12 micron
Spectrum of Comet Halley from the IKS-VEGA Experiment, Icarus, 76,
404-436 [1988Icar...76..404C]
Planetary Atmospheres Research Unit - Royal Belgian Institute for
Space Aeronomy
Description:
Profiles of pressure, temperature and species of the Martian
atmosphere derived from measurements of the NOMAD instrument on board
ESA's Trace Gas Orbiter. See paper
https://doi.org/10.1007/s11214-018-0517-2
Planetary Atmospheres Research Unit - Royal Belgian Institute for
Space Aeronomy
Description:
Profiles of species in Venus atmosphere terminator. Data retrieved
from calibrated spectra obtained with the SPICAV-SOIR instrument on
board the Venus Express spacecraft. These spectra can be checked on
the ESA PSA repository. See: A.C. Vandaele et al., Contribution from
SOIR/VEX to the updated Venus International Reference Atmosphere
(VIRA), Adv. Space Res. (2015),
http://dx.doi.org/10.1016/j.asr:2015.08.012.
Since 1973, the 18-cm lines of the OH radical have been
systematically observed in a number of comets with the Nançay radio
telescope. This allowed an evaluation of the cometary water production
rates and their evolution with time, as well as a study of several
physical processes: the excitation mechanisms of the OH radio lines,
the expansion of the cometary atmospheres, their anisotropy in
relation with non-gravitational forces, the Zeeman effect in relation
with the cometary magnetic field. The Nançay observations of 53
cometary apparitions between 1982 and 2009 are now organized in this
database.
