Physical studies of asteroids at Poznan Observatory

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Database of asteroid spin vector determinations

Last updated on 2014-02-14

Originally created by Per Magnusson, at that time working at the Uppsala Observatory (Sweden), is currently maintained by Agnieszka Kryszczynska. It provides data on asteroid spin vectors (given as the geocentric, ecliptic pole coordinates) and, in many cases, sidereal periods of rotation and shapes.

The database is available in 3 files:

If you would rather access the source files, used to create the table, please get one of the packages:

After unpacking in a single directory you would get the following files: spin.tex, def.tex, note.tex, newtable.tex, endtable.tex, spin.dat. If you have TeX installed, you can then launch the command tex spin.tex and get the spin.dvi which can be converted to other formats like PostScript or PDF.

Please use the following citation to reference this data set: Kryszczynska A., La Spina A., Paolicchi P., Harris A.W., Breiter S., Pravec P., 2007, New findings on asteroid spin-vector distributions, Icarus 192, 223-237.

Former updates are available here.


We make CCD observations at several places:

809 Lundia

Photometric observations of (809) Lundia obtained on nine consecutive nights during 18-26 Sep at Borowiec Observatory show that this V type asteroid, probably Flora family interlooper (Florczak et al. 2002, Icarus 159, 178) is a binary system with orbital period of 15.4 hours. A lightcurve with an amplitude of 1.1 mag displays mutual occultations/eclipses events, the first one being centered at 18.057 Sep UTC. The sharp minima have a depth of 0.75 mag and are of the same duration, indicating similar sizes of both components.

Lightcurve of 809 Lundia

After removing data from the four nights when Lundia was close to the Moon we obtain a better quality composite curve, presented below. Note that a typical "shoulder-like" shape of the lightcurve is now better visible.

Lightcurve of 809 Lundia

New data were obtained on 11-16 October, when the solar phase angle was about 15 deg. The figure presented below is slightly different in shape from the one from September, when the phase angle was about 25 deg.

Lightcurve of 809 Lundia

423 Diotima

On 15 March an occultation of a star by Diotima was observed from many sites: among 29 reports there are 16 positive measurements. This lightcurve, composited from data collected by T. Michalowski and R. Hirsch at Borowiec, as well as F. Velichko in Kharkov, should allow extrapolation of asteroid brightness to the moment of actual occultation.

Lightcurve of 423 Diotima

1998 SF36

This asteroid is a target of the Japanese space mission, Muses-C. It is being observed from many sites and the first data come from the beginning of December 2000. Here we present the composite lightcurve obtained by F. Colas and T. Kwiatkowski at Pic du Midi Observatory.

Lightcurve of 1998 SF36

90 Antiope

Adaptive optics observations of Antiope, performed in August 2000 with the Keck telescope showed that this object is in fact a binary asteroid. It consists of two equal-size bodies, each about 80 km across, orbiting each other during 16.5 hours.

Photometric observations of 90 Antiope, obtained in December 1996 in Ole Romer Observatory in Denmark (Hansen et al., 1997, Minor Planet Bulletin 24, 17) revealed a typical, binary-star lightcurve with occultations. At that time, however, the binary nature of Antiope was unknown.

To search for possible occultations in the Antiope binary system during the Autumn 2000 opposition, we have preformed CCD photometry of this asteroid from Borowiec and Pic du Midi observatories. Results, obtained by Tadeusz Michalowski (Poznan Observatory) and Francois Colas (IMCCE) are shown below as a composite lightcurve.

Lightcurve of 90 Antiope in 2000

New observations of Antiope at its December 2001 opposition are currently on. Preliminary composite lightcurve from 9 nights in Oct/Nov 2001 is shown below. It was prepared from observations of Tadeusz Michhalowski (Poznan Observatory) and Francois Colas (IMCCE).

Lightcurve of 90 Antiope in 2001

Other places of interest...

This page is maintained by Tomasz Kwiatkowski. It was last updated on 2011-10-31.