Berthelot Observatory Survey recently reported the detection of an unusual tail of comet 246P/NEAT. The discovery, submitted to Central Bureau for Astronomical Telegrams, was published as CBET 4799. The CBET is available bellow:
Further to CBET 4793, A. Sonka, M. Birlan, and A. Nedelcu, Berthelot Observatory, Astronomical Institute of the Romanian Academy, report on the unusual shape and tail of comet 246P from CCD observations obtained with a 0.38 m f/8 reflector (39'.8 x 28' field-of-view) at Berthelot Observatory on May 12, 21, and 23. A 60-s unfiltered exposure taken on May 23 shows an obvious 3' fanlike tail in p.a. 292.8 degrees, while 46 stacked images having a total exposure time of 0.8 hr shows a long tail visible at p.a. 296.8 degrees; the tail is at least 28' long and shows a 5'.4-long discontinuity, starting at 3' from the comet's coma (after the discontinuity ends, the tail continues and possibly extends outside the field-of-view. The comet's tail is also visible in images taken on May 12 and 21 at p.a. 296.8 degrees. The discontinuity is 5' long on May 12 and 8' long on May 21. Additional unfiltered CCD total-magnitude and coma-diameter measurements for comet 246P: Mar. 20.27 UT, 15.0, 40" (H. Sato, Tokyo, Japan, 0.25-m astrograph near Mayhill, NM, USA; fan-like tail 1'.5 long toward p.a. 250-290 degrees); May 29.44, 14.6, -- (K. Kadota, Ageo, Japan, 0.25-m reflector). Visual total-magnitude and coma-diameter estimates by P. Camilleri, Katherine, NT, Australia (0.40-m reflector): June 9.47, 13.8, 1'; June 14.45, 14.0, 1'.contact: sonka (at) astro.ro
Published on Jun 19, 2020
Published on Apr 21, 2020
The Astronomical Institute and the Astronomia 21 organisation are contributing to #StayAtHome Covid19-related state.
In the frame of “Școala altfel” – “A different type of learning”, on March 31, 2020, Diana Beșliu-Ionescu has presented “The Sun and its consequences on life” to a class of fourth grade students from ”Grigorie Ghica Voievod” Gymnasium School. Using Google Meet, available on the G Suite for education, students were able to follow our researcher’s presentation.
They have learned about the Sun’s position relative to our Galaxy, its evolution and structure. The students were most impressed by the scaled difference between Sun and Earth sizes represented using a 60 cm diameter yoga ball and a very small metal marble. Students also watched high-resolution animation provided by DOT showing photospheric activity around an active region. The presentation described what is a solar cycle, which eruptive events may influence the Earth and produce geomagnetic storms. At the end students were told that their phones can show the space weather status using NASA/ESA’s Apps.
Published on Apr 13, 2020
Dr. Mirel Birlan, researcher at Paris Observatory and the Astronomical Institute of the Romanian Academy is part of a team of researchers that has looked up-close at the Pallas asteroid, the third largest object in the asteroid belt, to better understand its unusual tilted orbit. The team discovered that the surface of the asteroid is so cratered, that researchers dubbed it “the golf ball asteroid”. The research team believes that the craters are a consequence of a violent period of collision during its history and that this could also explain the unusual inclination of its orbit that has puzzled scientists for centuries.
The Pallas asteroid is almost one-seventh the size of the Moon. For centuries, astronomers have noticed that the asteroid orbits along a significantly tilted track compared with the majority of objects in the asteroid belt. This inclination remained a mystery for a long time. Now a European team, led by principal investigator Pierre Vernazza from the Laboratoire d'Astrophyisque de Marseille in France, and including Dr. Mirel Birlan, obtained images of Pallas using ESO’s Very Large Telescope (VLT), an array of four telescopes, each with an 8-meter-wide mirror, situated in the mountains of Chile.
The high resolution images show a very cratered surface of the asteroid. In addition, the researchers created a reconstructed 3D model of the shape of the asteroid, revealing a heavily cratered object on the poles, but also at the equatorial regions. The researchers identified 36 craters larger than 30 kilometres in diameter, covering more than 10% of its surface — proof that Pallas experienced a violent period of collision during its history, two to three times more intense than the one of other large asteroids like Ceres or Vesta. The heavily cratered surface explains also the preservation of its initial shape after the formation. This collisional period could also explain Pallas’ tilted orbit.
The images of the asteroid have also revealed a bright spot on the surface of Pallas. The most probable explanation of this finding and its origin is that Pallas has large deposits of salts at its surface, most probably formed by a mixture of water and silicates. The investigations carried out by the European team have also led to the discovery of the Pallas family of asteroids, a cluster of small asteroids. Simulations of impacts with Pallas suggest that this family could be the result of a violent collision about 1.7 billion years ago by an object having a diameter between 20 km and 40 km. Asteroid 3200 Phaeton, identified as the source of the Geminids meteor shower, which is observed on Earth in December, is part of the Pallas family, and could provide clues to understanding the origin of the parent body, Pallas. Thus, observing meteors and collecting meteorites coming from Phaeton could partly solve the history of Pallas.
The findings were published in Nature Astronomy https://www.nature.com/articles/s41550-019-1007-5.
Published on Feb 20, 2020
Published on Feb 14, 2020
Jean Dragesco was born on the 27th of April 1920 at Cluj. When he was only 15 years old, he was already observing the Moon through a self-made 2″ telescope. Around the same age, he read an outstanding number of astronomy books written in French and this informational pathway made him acquire new scientific knowledge, the building blocks of his future and dedicated life for science.
At 17 years old, he built another telescope, a 4″ Newtonian, which had a mirror made in Stuttgart, Germany He built another mirror, still spherical, but 6″, and finished a good Altazimuthal Newtonian telescope. At 19 years old, he became "officially" a contributor to "Mars" section of Société Astronomique de France. In the same year, Jean Dragesco founded the first organization for the young astronomers in Romania called the Astronomical Society for Young Astronomers and he became the editor of the monthly publication Urania. The next year, he founded the Microscopy Association and started to publish the Micron journal.
Jean Dragesco left Romania for France when he was 21 years old. His father, Ion Dragu, was a philosopher, writer and diplomat; he worked for the Romanian Embassy in Paris as the Head of Press Office, during that time, Eugène Ionesco was Press and Cultural Secretary within the institution. Once in France, an excellent 3″ telescope came to being out of his own hands. After he became a member of Société Astronomique de France and an active observer of "Mars" section there, he got the permission to do observations withe the 6″ and 7.5″ (152 and 190 mm) telescopes at Paris Observatory. It is also the moment when he started to collaborate with several very knowledgeable and dedicated astronomers who latter on became professionals in the field.
At 22 years old, he discovered a gap between the rings B and C of planet Saturn. However, even if the same discovery was made a few weeks later by the distinguished French astronomer Bernard Lyot, the same who invented the coronagraph, the new discovery was attributed to him and not to Dragesco and it is today known as the ''Lyot division".
Published on Jan 26, 2020
Berthelot Observatory is a remote observing station of the Astronomical Institute. Built on General Berthelot village, Hunedoara, on a protected area belonging to the Romanian Academy, the observatory is operated in remote mode from Bucharest. Following the first light in mid-November 2018, the observatory is currently involved in near-Earth objects photometric surveys and tracking and surveillance activities in the framework of EU-SST programme of the European Commission.
The telescope is a RC 14.5'' F/7 Optical Guidance System on a fast, 8°/s, equatorial mount able to track objects on medium Earth orbits. The field of view, using an SBIG STL11000M CCD camera, is of 44'x30'.
Berthelot Observatory successfully concluded the first common European exercise of space surveillance and tracking taking place from 15 to 24 July 2019. Astrometry data for the four assigned targets was provided daily in TDM format.
On December 6th, Berthelot Observatory received the code L54 from the International Astronomical Union's Minor Planet Center (MPC).
Published on Dec 06, 2019
The Institute was recently involved in two new ESA-funded research and development projects. Cheia Antenna Retrofit Phase II is a project led by RARTEL Telespazio, a Leonardo and Thales company, aiming to include the 32 meters antennas presently available at the Cheia Satellite Ground Station, in the context of European SSA programme. The Institute will assist RARTEL in all the project phases (design, software development, integration and testing) for all the aspects related to the tracking services which shall be supplied through the newly developed radar infrastructure.
SYNOPTES project, led by Romanian InSpace Engineeering startup and having both Cluj and Bucharest observatories as partners, is developing a GNSS-based real-time clock (RTC) system for the temporal synchronization of SST ground based observations. Berthelot and Feleacu astronomical stations are the testing beds and on-sky validation infrastructures of the technical solution. Contact: nedelcu (at) astro.ro)
Published on Nov 19, 2019
Bucharest Science Festival opened the gates of the Astronomical Institute of the Romanian Academy for the general public, on the 27th of September 2019. The number of visitors exceeded any estimations being around 500 adults and children.
The Planetarium Hall was permanently full of people eager to learn who participated to several presentations with PowerPoint, video or specialized software support. The academic staff and astronomy teachers were: dr. Diana Beşliu-Ionescu (AIRA), Daniel Berteşteanu (Bucharest Astroclub), Florin Zăinescu (University of Bucharest).
A special moment of the evening was the live connection with France, as dr. Mirel Bîrlan (AIRA) interacted with the public through Skype directly from Paris Astronomical Observatory.
The activities included guided tours in the museum halls of the Institute - the Meridian Hall and the Equatorial Dome. There, some of the most important and spectacular astronomical instruments of Romania are preserved for future generations and they are used today for educational purposes.The tour guides - Sorin Marin (AIRA), Octavian Blagoi (AIRA) and Marian Naiman (Bucharest Astroclub) received many questions during the whole event, especially coming from the younger friends of astronomy and they answered to all of them.
The members of Bucharest Astroclub took part in organizing the BSF 2019 event. They displayed with great openness their instruments - several telescopes and their accessories and kindly instructed the public on how to watch the planets and the stars through them.
Published on Oct 04, 2019
Using Berthelot Observatory in remote mode we imaged the first interstellar comet - C/2019 Q4 (Borisov) . Based on the current arc, the comet is on a hyperbolic orbit with an eccentricity of almost 3. The comet will reach perihelion on December 7, 2019. Berthelot Observatory will continue to monitor this objects in the following weeks. Contact: sonka (at) astro.ro.
Published on Sep 14, 2019
Romanian Astronomical Journal is an international journal covering the fields of:
Published on Aug 04, 2019
Asteroid (6478) Gault is a mysterious object; although it is in the Main Belt of asteroids, this object presents a cometary activity. During 2018 and 2019 astronomers detected a tail of matter in the asteroid's motion around the Sun, most likely due to the sublimation of light elements in its composition. The phenomenon involves the particles of dust and gas that reflect sunlight.
An international team that includes researchers from MIT-US, Astronomical Institute of the Romanian Academy, Weizmann Institute of Science in Israel, Observatoire de Paris-France, Lowell Observatory, Institute for Astronomy in Hawaii, and Northern Arizona University, has monitored the asteroid and obtained spectral and photometric data of Gault, between March and April 2019. Near-infrared spectral observations were performed in late March and early April 2019 with the 3 m diameter IRTF (NASA) telescope located in Mauna Kea-Hawaii; the spectral data were corroborated with the photometric data (Figure 1) obtained with the NEEMO-T05 telescope operated by the Astronomical Institute of the Romanian Academy.
Observational data confirm that the surface of the object contains minerals rich in silicium, most likely similar to the mineralogical composition of the asteroid family (25) Phocaea. The spectral data show variations of the spectral slope, decorrelated by a possible burst in object's cometary activity. This aspect can be explained by observing a new layer, unaltered by space weather, predominantly present on the surface of the object after the initial dust layer was entrained in the tail developed by the asteroid.
These results were recently published in the prestigious Astrophysical Journal Letters.M. Marsset, F. DeMeo, A. Sonka, et al., "Active asteroid (6478) Gault: a blue Q-type surface below the dust?” accepted in Astrophysical Journal Letters. Contacts: Adrian Sonka, Astronomical Institute of the Romanian Academy, Mirel Birlan, Paris Observatory.
Published on Aug 04, 2019
The Sun is the main driver of space weather. Space weather is determining the state of the Earth magnetosphere, which, in its turn, triggers geomagnetic storms.
Coronal mass ejections (CMEs) are pieces of the puzzle that drive space weather. They are one of the most important pieces, because of their large quantities of magnetised plasma released into the heliosphere. An Earth directed CME can hit the magnetosphere about 2-4 days after its initial detection, but not all CMEs arriving to Earth will produce a geomagnetic storm.
Numerous methods (theoretical, numerical and empirical) are being used to predict whether the CME will be geoeffective or not. In a recent paper, a team of researchers lead by D. Beșliu-Ionescu have proposed a new logistic regression model that will produce a probability, expressed as a number between 0 and 1, that a CME will be an event associated with a geomagnetic storm (Beșliu-Ionescu et al., 2019).
Published on Aug 03, 2019
Thursday, December 13, 2018, the Romanian Academy has presented the 2016 Awards. Dr. Magda Stavinschi has been granted the "Petre SERGESCU" Award for her books "Nicolae Coculescu, A Life Among Stars" and "The Astronomy and the Romanian Academy".
A novelty in the award presenting by the Romanian Academy is the initiation of the "Petre Sergescu" Award, intended for rewarding the best history of science and technology papers, award that will be given following consultations and votes from all science departments of the Romanian Academy.
The award was established 125 years after the birth of the great science historian, both for showing the importance that sciences have in the contemporary society development, and for honoring the memory of the prominent scholars with outstanding contributions, starting from the precept expressed by Auguste Comte, saying that "to understand science, it is to know its history".
Published on Dec 16, 2018