C. List of Solar System Objects

From the ISO mission planning point of view the solar system targets differed from other astronomical targets. This is due to the fact that solar system objects (SSOs) have no fixed equatorial coordinates. Therefore they were identified by their names in the Mission Data Base and linked to their corresponding ephemerides. The database of ephemerides contains all outer planets, most of their moons, major comets and selected asteroids.

Observations of solar system targets required tracking of the specific object by the spacecraft via a raster observation (see Section 4.5). As the spacecraft raster option was already used for tracking there was no possibility to use the spacecraft raster mode for observations. Therefore, observations of solar system targets in the spacecraft raster mode were forbidden. Additionally, in a certain direction chopping was not feasible. Section 4.6 lists the available AOTs and restrictions with respect to observations of solar system objects. The spacecraft raster capabilities limited observations to objects with an apparent velocity of less than 2 arcminutes per hour with respect to equatorial coordinates.

There are several additional aspects specific to solar system targets (e.g. change of orbital parameters, eclipse of a moon around a planet, change of galactic background or stray radiation level, etc). Users who intend to work with ISO observations of SSOs retrieved from the ISO Data Archive should refer to the documentation available at the ISO IDC web site under:

http://www.iso.vilspa.esa.es/ $\rightarrow$ ISO Explanatory Library $\rightarrow$ ISO Satellite

on `Data reduction and analysis of SSO observations' for further information.

SSOs observed in the solar system tracking mode have associated numbers in the Mission Data Base that were used to identify these targets to the mission planning system, and therefore the ISO Data Archive (IDA) contains both the target name and the associated number in this list, either of which can be used in searching. Table C.1 gives SSO names and ISO generic numbers for all objects observed in this mode during the mission.

Note that other SSOs may have also been observed in non-tracking mode (i.e. fixed pointing), in which case they will appear in the archive solely by the name given by the observer. Non-tracking mode was used when looking at objects such as dust trails, the zodiacal light and Pluto. These sources are, of course, not included in Table C.1.

In addition, many other SSOs have been seen serendipitously in deep ISOCAM images, in large survey programmes, in the CAM parallel survey and in the PHT serendipity mode.

Table C.1: Objects observed with ISO using the SSO tracking mode.

Agamemnon	210911		Neptune	200800
Aneas	211172		Nuwa	210150
Aten	212062		Oljato	212201
Callisto	200504		P/Comas Sola	220014
Ceres	210001		P/Elst-Pizarro	220050
Chiron	212060		P/Encke	220004
Cybele	210065		P/Hale-Bopp	220048
Davida	210511		P/Hartley 2	220028
Deimos	200402		P/Helin-Roman-Alu 1	220033
Diomedes	211437		P/Honda-Mrkos-Pajdusakov	220012
Dionysus	213671		P/IRAS	220017
Egeria	210013		P/Kopff	220015
Europa	200502		P/Reinmuth 1	220035
Europa	210052		P/Schwassmann-W. 1	220001
Frigga	210077		P/Shoemaker-Holt 1	220034
Ganymede	200503		P/Tempel-Tuttle	220029
Hebe	210006		P/Wild 2	220020
Hektor	210624		P/Wirtanen	220018
Hestia	210046		P/Wolf-Harrington	220024
Hispania	210804		Palisana	210914
Hygiea	210010		Pallas	210002
Iapetus	200608		Phaethon	213200
Io	200501		Pholus	215145
Juno	210003		Polyxo	210308
Jupiter	200500		Rodari	212703
Jupiter North Pole	200551		Saturn	200600
Jupiter South Pole	200552		Tezcatlipoca	211980
Kassandra	210114		Titan	200606
Lacadiera	210336		Tokio	210498
Mars	200400		Toutatis	214179
Massalia	210020		Uranus	200700
Melete	210056		Vesta	210004
Metis	210009		Wilson-Harrington	214015
Mimistrobel	213840