scientific abstract this proposal makes use of the opportunity given by iso to study the properties fo the different dust populations in interplanetary space with the same instrument and identical observational procedures. for technical reasons, the properties of dust in comets and of asteroid surfacess are studied in separate central programme proposals, while this central programme proposal deals with - dust in the general interplanetary medium, - dust in the asteroidal bands, - dust in cometary trails. this procedure allows a thorough comparison of interplanetary dust with the properties of dust released from its probable sources, comets and asteroids, and thus contributes to the knowledge of the origin of interplanetary dust. observation summary the properties of dust in the interplanetary medium, in asteroidal bands and in comet trails will be studied with isophot by the same type of measurements: photometry with isophot-p and isophot-c, either with full or with reduced spectral coverage, and spectrophotometry with isophot-s. in addition, scans perpendicular to the chosen asteroidal bands and comet trail will be performed to detect structure and to determine the position of maximum brightness for subsequent full photometry and spectrophotometry. for all measurements the largest aperture (180 arcsec) will be used. we aim at relative photometric accuracies of at least a few percent or better, which is needed to separate bands or trails from the much brighter background of zodiacal light. in spectrophotometry this accuracy will not be achieved for a single pixel. here we take the longest available integration time and will improve the signal-to-noise ratio by binning. the proposal consists of three parts: 1. dust in the general interplanetary medium 2. asteroidal bands 3. cometary trails object lists and breakdown of observations by aot.s will be given in the three separate parts of this proposal. the common observing plan for photometry, spectrophotometry or scans will be given here. the choice of filters reflects the coordination with the proposals on comets, zodiacal light and extragalactic background light. distribution of the observing times: observations priority 1 priority 2 priority 3 sum ------------------------------------------------------------------ general medium 6478 s 15254 s 6478 s 28210 s asteroidal band 0 s 54369 s 0 s 54369 s cometary trail 24988 s 0 s 1859 s 26847 s ------------------------------------------------------------------ total 31466 s 69623 s 8337 s 109426 s (8.7 h) (19.3 h) (2.3 h) (30.4 h) 29 % 64 % 8 % === detailed observing plan === 1. full photometry filter t(on object) t(performance) ---------------------------------------------- p_3.6 256 s 562 s p_4.85 64 s 180 s p_7.3 32 s 114 s p_10 32 s 110 s p_12.8 32 s 106 s p_11.5 32 s 98 s p_16 32 s 104 s p_25 32 s 198 s p_60 32 s 200 s p_100 32 s 202 s c_135 32 s 86 s c_160 32 s 76 s c_200 32 s 82 s \t acquisition 180 s ------------------------------------------------- performance time 2298 s (0.64 h) 2. reduced photometry filter t(on object) t(performance) ---------------------------------------------- p_7.3 32 s 114 s p_10 32 s 110 s p_12.8 32 s 106 s p_11.5 32 s 98 s p_16 32 s 104 s p_25 32 s 198 s p_60 32 s 200 s p_100 32 s 202 s c_160 32 s 76 s c_200 32 s 82 s \t acquisition 180 s ------------------------------------------------- performance time 1470 s (0.41 h) 3. short photometry for scans filter t(on object) t(performance) ----------------------------------------------------------------
Instrument
PHT03 , PHT22
Temporal Coverage
1997-01-09T19:42:40Z/1997-01-10T01:45:32Z
Version
1.0
Mission Description
The Infrared Space Observatory (ISO) was the worlds first true orbiting infrared observatory. Equipped with four highly-sophisticated and versatile scientific instruments, it was launched by Ariane in November 1995 and provided astronomers world-wide with a facility of unprecedented sensitivity and capabilities for a detailed exploration of the Universe at infrared wavelengths.
European Space Agency, Leinert et al., 1998, 'Properties of solar system dust comma Section 3 ', 1.0, European Space Agency, https://doi.org/10.5270/esa-oye6o92
