UESAC — The Uppsala-ESO Survey of Asteroids and Comets

The Uppsala-ESO Survey of Asteroids and Comets was undertaken to find previously undetected comets in the vicinity of Jupiter. Over 15000 positions of moving objects have been detected on 74 plates obtained from the European Southern Observatory in Chile and from the Anglo-Australian Observatory in Australia in 1992 and 1993. Two or more positions were secured for about 3300 asteroids and orbits have so far been calculated for 1944 asteroids. The main bulk of these asteroids are previously undetected. We present absolute magnitudes and diameters for asteroids which have an accurate orbit. The magnitude and diameter distributions are compared to the results of the Palomar-Leiden Survey of Faint Minor Planets.     

A survey of main-belt asteroids. II. Positions and improved orbital elements for 62 unnumbered asteroids

More than 7 000 positions of moving objects were detected on 33 films obtained with the Schmidt telescope at the European Southern Observatory in Chile during August and September 1995. The majority of these asteroids are previously unobserved. This paper presents the results for 62 unnumbered asteroids with provisional designations found in the fields. References to the derived positions for these asteroids are given and improved orbital elements have been calculated using all available positions.     

A survey of main-belt asteroids I. Positions and improved orbital elements for 75 numbered asteroids.

More than 7000 positions of moving objects have been detected on 33 films obtained with the Schmidt telescope at the European Southern Observatory in Chile during August and September 1995. The majority of these asteroids are previously unobserved. This paper presents the astrometric methods as well as the magnitude determinations. The derived positions for the numbered asteroids are presented and for these improved orbital elements have been calculated using all available positions.     

Physical studies of asteroids. X. Photoelectric light curves of the asteroids 219 and 512

Composite light curves are presented for the asteroids 219 Thusnelda and 512 Tarinensis. Rotation periods of 1 _. ^d 24 and 0 _. ^d 2326 were derived for the two asteroids, respectively.UBV-colours are presented for the asteroids 147, 219, 317, and 512.Based on observations collected at the European Southern Observatory, La Silla, Chile     

The spin periods of masteroids

In an attempt to verify the suggestion by Harris and Burns (1979) that M-type asteroids in general have high spin rates we are currently involved in a programme of photoelectricUBV observations of M and CMEU asteroids. Recently we have thus determined rotation periods, light-curve amplitudes andUBV colour indices for the asteroids 201 Penelope and 250 Bettina, both of which are situated in the (C,M,E) domain of the two-colour diagram. The resulting periods are very short (cf., IAUC 3523 and 3527). In general, we find that both the M and CMEU asteroid groups appear to be characterized by fast rotations, large amplitudes and an avoidance of membership in Hirayama families.Based on observations partly obtained at the European Southern Observatory, La Silla, Chile.     

Asteroids observed at the GPO,La Silla

Continuing the observational programme, which was started in 1976 at the European Southern Observatory (ESO), La Silla, by Debehogne a lot of new photographic plates was obtained during February-March in 1989. These plates are used for the determination of positions of asteroids selected by „Ephemerides of Minor Planets for 1989”︁, edited by the Institute of Theoretical Astronomy of Leningrad (ITA) in 1988. They permit also discoveries of new celestial bodies as well as reidentifications of lost or badly observed asteroids during the last years. For the part treated here, the examination of the plates has revealed nine asteroids not mentioned in the Russian Ephemerides or in the disquettes as fournished by the Minor Planet Centre (MPC) of SAO. Seven were present in the ITA source.     

Monochromatic observations of three nebular objects in the direction of NGC 1714

Using a CCD as detector, we have observed three nebulosities not yet listed in catalogues; they all present a planetary nebula morphology and are situated in the immediate neighbourhood (less than 3 arc min to the East) of NGC 1714. Observations have been made through interference filters centered on the main emission lines of these objects.The observations were made at the E.S.O. in La Silla (Chile).European Southern Observatory, La Silla, Santrago de Chile.     

Photometric data and analysis of the light curve of the W UMa-variable ST Ind

Photoelectric observations of the W UMa variable ST Ind are analyzed which were obtained at the European Southern Observatory in the course of a program to monitor light curve fluctuations. Photometric and geometric elements of ST Ind are derived. The observations show the presence of a periodic fluctuation in certain parts of the light curve which may be explained by the precessional motion of the rotation axis of the brighter component.Based on observations collected at the European Southern Observatory, La Silla, Chile.     

The very short period W UMa system V 1022 Ophiuchi

Photoelectric light curves of V1022 Oph inB andV are presented. It has been confirmed that it is a W UMa type eclipsing binary with one of the shortest periods known (P<0.^d25). Some general properties of the system have been derived.Based on observations made at the European Southern Observatory (La Silla/Chile)     

A photometric study of the Algol system Y Hydri

297UBV observations of the Algol type eclipsing binary Y Hyi are presented and analyzed by a synthetic light curve technique. The system is semi-detached and shows complete eclipses.Based on observations collected at the European Southern Observatory, La Silla, Chile.