Beobachtungen Kleiner Planeten. XIII

Es wird eine Übersicht gegeben über die im Jahr 1992 auf Tautenburger Schmidtplatten gefundenen Kleinen Planeten. Es wurden 518 Objekte beobachtet und für diese 2396 Positionen gerechnet. Es handelt sich um 408 Planetoiden mit provisorischer Bezeichnung, unter denen 274 neu vergebene Bezeichnungen sind, sowie um 110 numerierte Objekte. Für 172 Tautenburger Objekte wurden Bahnen aus einer Opposition gerechnet. Für 55 im Berichtszeitraum numerierte Planeten haben Tautenburger Positionen einen Beitrag geleistet. Acht Tautenburger Planetoiden wurden numeriert (Tab. 3). A summary is given about the Minor Planet survey performed in 1992 on Tautenburg Schmidt plates. 518 asteroids were observed and 2396 positions are calculated for them. These are 408 asteroids with provisional designations (274 of them have new designations) and 110 numbered objects. One-opposition orbits have been computed for 172 Tautenburg asteroids. Tautenburg observations could give a contribution to 55 planets numbered in the period of this report. Eight Tautenburg asteroids have been numbered (Tab. 3).     

Beobachtungen Kleiner Planeten. XII

Es wird eine Übersicht gegeben über die im Jahr 1991 auf Tautenburger Schmidtplatten gefundenen Kleinen Planeten. Es wurden 533 Objekte beobachtet und für diese 2066 Positionen gerechnet. Es handelt sich um 456 Planetoiden mit provisorischer Bezeichnung, unter denen 324 neu vergebene Bezeichnungen sind, sowie um 77 numerierte Objekte. Für Tautenburger Objekte wurden 250 Bahnen aus einer Opposition gerechnet. Für 54 im Berichtszeitraum numerierte Planeten, darunter befinden sich auch (4999) MPC und (5000) IAU, haben Tautenburger Positionen einen Beitrag geleistet. Neun Tautenburger Planetoiden wurden numeriert (Tab. 3). A summary is given about the Minor Planet survey performed in 1991 on Tautenburg Schmidt plates. 533 asteroids were observed and 2066 positions are calculated for them. These are 456 asteroids with provisional designations (324 of them have new designations) and 77 numbered objects. One-opposition orbits have been computed for 250 Teutenburg asteroids. Tautenburg observations could give a tribute to 54 planets numbered in the period of this report, among them are (4999) MPC and (5000) IAU, too. Nine Tautenburg asteroids have been numbered (Tab. 3).     

Beobachtungen Kleiner Planeten. VIII

Es wird eine Übersicht gegeben über die im Jahr 1987 auf Tautenburger Schmidtplatten gefundenen Kleinen Planeten. Es wurden 290 Objekte entdeckt und für diese 845 Positionen gerechnet. Es handelt sich um 75 numerierte Objekte, von denen drei auf der kritischen Liste von EMP 1988 stehen, sowie um 215 Planetoiden mit provisorischen Bezeichnungen. Von letzteren erhielten 191 neue Bezeichnungen. Für 17 im Berichtszeitraum numerierte Planeten haben Tautenburger Beobachtungen einen Beitrag geleistet. Darunter sind zwei in Tautenburg entdeckte Planetoiden: 1967 GF1 erhielt die Nummer (3539) und den Namen Weimar, der Trojaner 1973 UF5 die Nummer (3540) und den Namen Protesilaos. A summary is given about the Minor Planet survey performed in 1987 on Tautenburg Schmidt plates. There were discovered 290 asteroids and calculated 845 positions for them. These are 75 numbered objects and 215 asteroids with provisional designations, 191 of them have new designations. Tautenburg observations could give a tribute to 17 planets numbered in the period of this report, including two asteroids discovered in Tautenburg: 1967 GF1 received the number (3539) and the name Weimar, the Trojans 1973 UF5 the number (3540) and the name Protesilaos.     

Beobachtungen Kleiner Planeten. XIV

A summary is given about the Minor Planet survey performed in 1993 on Tautenburg Schmidt plates. 392 asteroids were observed and 1462 positions are calculated for them. These are 297 asteroids with provisional designations (217 of them have new designations) and 95 numbered objects. Ten new designations originate from the KSO-ARI-Survey IV. Tautenburg observations could give a tribute to 50 planets numbered in the period of this report. Six Tautenburg asteroids have been numbered (Tab. 3).     

Beobachtungen Kleiner Planeten. IX

A summary is given about the minor planet survey performed in 1988 on Tautenburg Schmidt plates. There were discovered 386 asteroids and 1218 positions were calculated for them. These are 87 numbered objects and 299 asteroids with provisional designations, 252 of them have new designations. Tautenburg observations contributed to 40 planets numbered in the period of this report, including eight discovered in Tautenburg.     

Beobachtungen Kleiner Planeten. XV.

A summary is given about the Minor Planet survey performed in 1994 on Tautenburg Schmidt plates. 321 asteroids were observed and 1171 positions are calculated for them. These are 200 asteroids with provisional designations (102 of them have new designations) and 121 numbered objects. Tautenburg observations could give a tribute to 73 planets numbered in the period of this report. Fourteen Tautenburg asteroids have been numbered.     

Beobachtungen Kleiner Planeten. VI.

A summary is given about the Minor Planet survey performed in 1985 on Tautenburg Schmidt plates. There were discovered 95 asteroids and calculated 168 positions for them. These are 20 numbered objects and 75 asteroids with provisional designations, two of them have no new designation. Tautenburg observations could give a tribute to twelve planets numbered in the period of this report. Two asteroids discovered in Tautenburg have received numbers and names: (3245) Jensch = 1973 UL5 and (3338) Richter = 1973 UX5.     

Beobachtungen Kleiner Planeten. II

Here is a summary about the Minor Planet survey performed in 1981 on Tautenburg Schmidt plates. We discovered 294 planets and calculated 614 positions for them.     

Beobachtungen Kleiner Planeten. V

A summary is given about the Minor Planet survey performed in 1984 on Tautenburg Schmidt plates. We discovered 84 planets and calculated 205 positions for them. Among them are 17 numbered planets, 16 already earlier observed and 51 new planets with provisional designations. Tautenburg observations could give a tribute to seven planets numbered in the period of this report. The planet 1964 EC discovered in Tautenburg has received the permanent number (3181). In honor of Dr. PAUL AHNERT (^*22. 11. 1897) this planet obtained the name Ahnert.     

Beobachtungen Kleiner Planeten. III

A summary is given about the Minor Planet survey performed in 1982 on Tautenburg Schmidt plates. We discovered 229 planets and calculated 643 positions for them. Tautenburg observations have given a tribute to ten planets numbered in 1982. Planet (2424) discovered by us has received the name Tautenburg.     

Beobachtungen Kleiner Planeten. IV

A summary is given about the Minor Planet survey performed in 1983 on Tautenburg Schmidt plates. We discovered 147 planets and calculated 272 positions for them. Tautenburg observations could give a tribute to fourteen planets numbered in the period of this report. The planet 1981 VL 2 discovered in Tautenburg has received the permanent number (2861). In honor of Prof. HERMANN LAMBRECHT († 4. 6. 1983) this planet obtained the name Lambrecht.     

Positionen Kleiner Planeten

The table contains topocentric positions of several minor planets. The coordinates are given for the epoch 1950.0     

Positionen Kleiner Planeten

The table contains topocentric positions of several minor planets. The coordinates are given for the epoch 1950.0.     

Positionen Kleiner Planeten 1977

The table contains the topocentric positions of several minor planets. The coordinates are given for the epoch 1950.0.     

Beobachtungen kleiner Planeten

We represent the publication of photographic observations of some minor planets, made at the University Observatory Siegen.     

Positionen Kleiner Planeten und Kometen

The table contains topocentric positions of several minor planets and comets. The coordinates are given for the epoch 1950.0.     

YORP-Induced Long-Term Evolution of the Spin State of Small Asteroids and Meteoroids: Rubincam's Approximation

The rotation states of small asteroids and meteoroids are determined primarily by their collisions, gravitational torques due to the Sun and planets (in the case of close encounters), and internal dissipative effects (that relax the free-precession energy toward the fundamental state of principal-axis rotation). Rubincam has recently pointed out that thermal reemission on irregular-shaped bodies also results in a torque that may secularly change both the rotation rate and the orientation of the spin axis (the so-called YORP effect). Here we pursue investigation of this effect. Keeping the zero thermal-relaxation approximation of Rubincam and the assumption of the principal-axis rotation, we study the YORP effect both for precisely determined shapes of near-Earth asteroids and also for a large statistical sample of automatically generated shapes by the Gaussian-sphere technique of Muinonen. We find that the asymptotic state of the YORP evolution is characterized by an arbitrary value of the obliquity, with higher but nearly equal likelihood of 0°/180° and 90° states. At the adopted approximation, the most typical feature of this end state of the YORP evolution is secular deceleration of the rotation rate, which means that at some instant collisions will randomize the rotation state. In a minority of cases, the final state of the obliquity evolution leads to a permanent acceleration of the body's rotation, eventually resulting in rotational fission. The YORP-induced slow evolution may also play an important role in driving the rotation state of small asteroids toward the resonances between the forced precession due to the solar torque and perturbations of the orbital node and inclination. We find that for small Themis asteroids these resonances are isolated in the relevant range of frequencies, and the YORP evolving rotation may be either temporarily captured or rapidly jump across these resonances. In contrast, the possible values of the forced precession for small Flora asteroids may be resonant with clustered, nonisolated lines of the orbital perturbation. The individual rotation histories of small Flora asteroids may be thus very complicated and basically unpredictable. We comment on possible astronomical consequences of these results.     

Zur Bestimmung absoluter Rektaszensionen und Deklinationen von Sterngruppen mittels Kleiner Planeten

Es wird eine Möglichkeit aufgezeigt, mittels Beobachtungen eines Planetoiden möglichst geringer Exzentrizität, verteilt über einen kurzen Beobachtungszeitraum und möglichst in einer geozentrischen Schleife gelegen, absolute Positionen einer zweckmäßigkeitshalber geringen Anzahl von Sternen aus dem durchwanderten Gebiet erhalten zu können.