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

AbstractWe present the statistics of the asteroids observed and discovered at the Molėtai Observatory, Lithuania, in 2008–2009 within the project for astrometric observations of the near-Earth objects (NEOs), the main belt asteroids and comets. CCD observations of the asteroids were obtained with the 35/51-cm Maksutov-type meniscus telescope. In the Minor Planet Circulars and the Minor Planet Electronic Circulars (2008–2009), 11 900 astrometric positions of 2522 asteroids were published. Among them 95 were new asteroids, including four belonging to the Trojan group: (352655) 2008QX28, 2008 SE8, (353194) 2009 SM100 and (264068) 2009 SQ148. For the asteroids discovered at Molėtai their precise orbits are calculated. Because of short observational arc, a few asteroids have low-precision orbits and some asteroids are considered lost. For the three Main Belt asteroids with low-precision orbital elements, 2008 QP32, 2008 SD8 and 2008 SG150, we present their ephemerides for 2017. They can be brighter than 20 mag.

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Observational Data and Orbits of the Asteroids Discovered at the Baldone Observatory in 2008–2013

Open Astronomy ◽

10.1515/astro-2017-0226 ◽

2015 ◽

Vol 24 (3) ◽

Cited By ~ 1

Author(s):

K. Černis ◽

I. Wlodarczyk ◽

I. Eglitis

Keyword(s):

Observational Data ◽

Ccd Camera ◽

Minor Planet ◽

Orbital Elements ◽

Main Belt ◽

Schmidt Telescope ◽

Ccd Observations ◽

Near Earth Objects ◽

Asteroids And Comets

AbstractThe paper presents statistics of the asteroids observed and discovered at the Baldone Observatory, Latvia, in 2008–2013 within the project for astrometric observations of the near-Earth objects (NEOs), the main belt asteroids and comets. CCD observations of the asteroids were obtained with the 0.80/1.20 m, f/3 Schmidt telescope and a ST-10XME 15 × 10 mm CCD camera. In the Minor Planet Circulars and the Minor Planet Electronic Circulars (2008–2013) we published 3511 astrometric positions of 826 asteroids. Among them, 43 asteroids were newly discovered at Baldone. For 36 of these asteroids the precise orbits are calculated. Because of short observational arc and small number of observations, a few asteroids have low-precision orbits and their tracks have been lost. For seven objects with poorly known orbits we present their ephemerides for 2015–2016. The orbits and the evolution of orbital elements of two asteroids, (428694) 2008 OS9 from the Apollo group and the Centaur (330836) Orius (2009 HW77), are recalculated including new observations obtained after 2011.

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Observation of 44(Nysa) Asteroid by IST60 Telescope

Proceedings of the International Astronomical Union ◽

10.1017/s1743921319003387 ◽

2018 ◽

Vol 14 (A30) ◽

pp. 40-40

Author(s):

Remziye Canbay ◽

Fulin Gursoy

Keyword(s):

Minor Planet ◽

Web Interface ◽

Orbital Elements ◽

Main Belt

AbstractIn this study, the main belt asteroid (44) Nysa, which is also a known member of the Nysian asteroid family, was observed by IST60 telescope. The orbital elements were compared with MPO(Minor Planet Center) and NASA Horizons Web-Interface results.

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Verification of the V-type asteroids rotation distribution outside Vesta family

10.5194/epsc2020-1128 ◽

2020 ◽

Author(s):

Volodymyr Troianskyi ◽

Keyword(s):

Numerical Modelling ◽

Thermal Parameters ◽

Orbital Elements ◽

Main Belt ◽

Preliminary Results ◽

Yarkovsky Effect ◽

Photometric Observations

The main objective of the study is the verification of the V-type rotation distribution. Though numerical modelling, Nesvorny et al. (2008) showed that asteroids can migrate through Yarkovsky effect and resonaces outside the boundaries of the Vesta family. In particular they found that objects which end up in the scattered resonances region (so-called Cell I, defined by orbital elements 2.2 AU < a < 2.3 AU, 0.05 < e < 0.2, 0 the Yarkovsky drift. Consequently, most of the V-types in Cell I should be retrograde rotating. Similarly showed that asteroids migrating to the low inclination region (Cell II defined by 2.32 AU < a < 2.48 AU, 0.05 < e < 0.2, 2 deg We perform photometric observations and determine spins and shapes of V-type objects in Cell I and II to verify the predicted statistics of sense of rotation. Finding significantly un-matching statistics for rotational properties may strengthen the idea that there may be fragments of other (than Vesta) differentiated planetesimals in the inner main belt. We show preliminary results for the first few asteroids in Cell I and II.

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Are the main belt comets, comets?

Proceedings of the International Astronomical Union ◽

10.1017/s1743921310001778 ◽

2009 ◽

Vol 5 (S263) ◽

pp. 215-217

Author(s):

Javier Licandro ◽

Humberto Campins

Keyword(s):

Visible Spectrum ◽

Oort Cloud ◽

Orbital Elements ◽

Main Belt ◽

Cometary Nuclei ◽

Earth Asteroid ◽

William Herschel ◽

Cometary Origin ◽

Strong Contrast ◽

Cometary Activity

AbstractWe present the visible spectrum of asteroid-comet transition object 133P/Elst-Pizarro (7968), the first member of the new population of objects called Main Belt Comets (Hsieh & Jewitt 2006). The spectrum was obtained with the 4.2m William Herschel Telescope at the “Roque de los Muchachos” observatory. The orbital elements of 133P place it within the Themis collisional family, but the observed cometary activity during it last 3 perihelion passages also suggest a possible origin in the trans-Neptunian belt or the Oort Cloud, the known sources of comets. We found a clear similarity between our spectrum of 133P and those of other members of the Themis family such as 62 Erato, and a strong contrast with those of cometary nuclei, such as 162P/Siding-Spring. This spectral comparison leads us to conclude that 133P is unlikely to have a cometary origin. This conclusion is strengthened by spectral similarities with activated near-Earth asteroid 3200 Phaethon, and suggest that there are activated asteroids in the near-Earth asteroid and main belt populations with similar surface properties.

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Observational Data and Orbits of the Asteroids Discovered at the Molėtai Observatory in 2005–2007

Open Astronomy ◽

10.1515/astro-2017-0119 ◽

2016 ◽

Vol 25 (2) ◽

Author(s):

K. Černis ◽

I. Wlodarczyk ◽

J. Zdanavičius

Keyword(s):

Observational Data ◽

Minor Planet ◽

Orbital Elements ◽

Main Belt ◽

New Normal ◽

Ccd Observations ◽

Near Earth Objects ◽

Asteroids And Comets

AbstractThe paper presents statistics of the asteroids observed and discovered at the Molėtai Observatory, Lithuania, in 2005–2007 within the project for astrometric observations of the near-Earth objects (NEOs), the main belt asteroids and comets. CCD observations of asteroids were obtained with the 35/51 cm Maksutov-type meniscus telescope and the 1.65 m Ritchey-Chretien reflector. In the Minor Planet Circulars and the Minor Planet Electronic Circulars (2005–2007) we published 17 003 astrometric positions of 2980 asteroids. Among them 112 were new normal asteroids and one NEO (2006 SF77) discovered at Molėtai; a few NEOs were found by our team independently. For the asteroids discovered at Molėtai their precise orbits were calculated. Because of short observational arc, a few asteroids have low-precision orbits and some asteroids have been lost. For three of them with low-precision orbital elements (NEO 2006 SF77 and two Mars crossers – 2006 SN368 and 2007 VM315), we present their ephemerides for 2016–2018.

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

Astronomische Nachrichten ◽

10.1002/asna.2113180308 ◽

1997 ◽

Vol 318 (3) ◽

pp. 183-186

Author(s):

C.-I. Lagerkvist ◽

G. Hahn ◽

M. Lundström ◽

J. S. V. Lagerros ◽

O. Hernius ◽

...

Keyword(s):

Orbital Elements ◽

Main Belt

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Shape models and dynamical properties of basaltic asteroids outside the dynamical Vesta family

10.5194/epsc2021-217 ◽

2021 ◽

Author(s):

Volodymyr Troianskyi ◽

Dagmara Oszkiewicz ◽

Anna Marciniak ◽

Pawel Kankiewicz ◽

Dora Fohring ◽

...

Keyword(s):

Numerical Modeling ◽

Parent Body ◽

Thermal Parameters ◽

Orbital Elements ◽

Main Belt ◽

Preliminary Results ◽

Shape Models ◽

Photometric Observations ◽

Current Location ◽

Dynamical Properties

Through numerical modeling, Nesvorny et al. (2008) showed that asteroids can migrate due to Yarkovsky drift and resonances to outside of the boundaries of the Vesta family. In particular, they found that objects which end up in the scattered resonances region (so-called Cell I, defined by orbital elements 2.2 AU < a < 2.3 AU, 0.05 < e < 0.2, 0 < i deg < 10 deg) typically have retrograde rotations and thermal parameters that maximize Yarkovsky drift rates. These autors also showed, that asteroids migrating to the low inclination region (Cell II defined by 2.32 AU < a < 2.48 AU, 0.05 < e < 0.2, 2 deg We performe photometric observations and determine spins and shapes of V-type objects in Cell I and Cell II in order to characterize the dynamical properties of these asteroids more accurately. The results of dynamical modelling show that some asteroids may have migrated to their current location from the Vesta family within ~2 Gy. There are objects, however, whose origin in another parent body may also be plausible. This may support the hypothesis that the number of differentiated basaltic objects in the inner and middle Main Belt should be much higher than previously assumed. We will present preliminary results for the first ~10 asteroids in Cell I and Cell II.

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Artificial satellite orbit computations

Symposium - International Astronomical Union ◽

10.1017/s0074180900105662 ◽

1966 ◽

Vol 25 ◽

pp. 363-371

Author(s):

P. Sconzo

Keyword(s):

Artificial Satellite ◽

Satellite Orbit ◽

Artificial Satellites ◽

Orbital Elements ◽

Differential Correction ◽

Gravitational Effects ◽

Short Intervals ◽

The Subject ◽

Introductory Discussion ◽

Orbit Computation

In this paper an orbit computation program for artificial satellites is presented. This program is operational and it has already been used to compute the orbits of several satellites.After an introductory discussion on the subject of artificial satellite orbit computations, the features of this program are thoroughly explained. In order to achieve the representation of the orbital elements over short intervals of time a drag-free perturbation theory coupled with a differential correction procedure is used, while the long range behavior is obtained empirically. The empirical treatment of the non-gravitational effects upon the satellite motion seems to be very satisfactory. Numerical analysis procedures supporting this treatment and experience gained in using our program are also objects of discussion.

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Statistical results on discovered near-Earth asteroids

International Astronomical Union Colloquium ◽

10.1017/s0252921100031262 ◽

1999 ◽

Vol 173 ◽

pp. 81-86

Author(s):

S. Berinde

Keyword(s):

Dynamical Evolution ◽

Minor Planet ◽

Orbital Elements ◽

The Earth ◽

Near Earth Asteroids ◽

Statistical Results

AbstractThe first part of this paper gives a recent overview (until July 1st, 1998) of the Near-Earth Asteroids (NEAs) database stored at Minor Planet Center. Some statistical interpretations point out strong observational biases in the population of discovered NEAs, due to the preferential discoveries, depending on the objects’ distances and sizes. It is known that many newly discovered NEAs have no accurately determinated orbits because of the lack of observations. Consequently, it is hard to speak about future encounters and collisions with the Earth in terms of mutual distances between bodies. Because the dynamical evolution of asteroids’ orbits is less sensitive to the improvement of their orbital elements, we introduced a new subclass of NEAs named Earth-encounter asteroids in order to describe more reliably the potentially dangerous bodies as impactors with the Earth. So, we pay attention at those asteroids having an encounter between their orbits and that of the Earth within 100 years, trying to classify these encounters.

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