scholarly journals 280 one-opposition near-Earth asteroids recovered by the EURONEAR with the Isaac Newton Telescope

2018 ◽  
Vol 609 ◽  
pp. A105 ◽  
Author(s):  
O. Vaduvescu ◽  
L. Hudin ◽  
T. Mocnik ◽  
F. Char ◽  
A. Sonka ◽  
...  
Keyword(s):  
Moving Objects ◽  
Wide Field ◽  
Minor Planets ◽  
Main Belt ◽  
Isaac Newton ◽  
Isaac Newton Telescope ◽  
Fast Motion ◽  
The One ◽  
Near Earth Asteroids

Context. One-opposition near-Earth asteroids (NEAs) are growing in number, and they must be recovered to prevent loss and mismatch risk, and to improve their orbits, as they are likely to be too faint for detection in shallow surveys at future apparitions. Aims. We aimed to recover more than half of the one-opposition NEAs recommended for observations by the Minor Planet Center (MPC) using the Isaac Newton Telescope (INT) in soft-override mode and some fractions of available D-nights. During about 130 h in total between 2013 and 2016, we targeted 368 NEAs, among which 56 potentially hazardous asteroids (PHAs), observing 437 INT Wide Field Camera (WFC) fields and recovering 280 NEAs (76% of all targets). Methods. Engaging a core team of about ten students and amateurs, we used the THELI, Astrometrica, and the Find_Orb software to identify all moving objects using the blink and track-and-stack method for the faintest targets and plotting the positional uncertainty ellipse from NEODyS. Results. Most targets and recovered objects had apparent magnitudes centered around V ~ 22.8 mag, with some becoming as faint as V ~ 24 mag. One hundred and three objects (representing 28% of all targets) were recovered by EURONEAR alone by Aug. 2017. Orbital arcs were prolonged typically from a few weeks to a few years; our oldest recoveries reach 16 years. The O−C residuals for our 1854 NEA astrometric positions show that most measurements cluster closely around the origin. In addition to the recovered NEAs, 22 000 positions of about 3500 known minor planets and another 10 000 observations of about 1500 unknown objects (mostly main-belt objects) were promptly reported to the MPC by our team. Four new NEAs were discovered serendipitously in the analyzed fields and were promptly secured with the INT and other telescopes, while two more NEAs were lost due to extremely fast motion and lack of rapid follow-up time. They increase the counting to nine NEAs discovered by the EURONEAR in 2014 and 2015. Conclusions. Targeted projects to recover one-opposition NEAs are efficient in override access, especially using at least two-meter class and preferably larger field telescopes located in good sites, which appear even more efficient than the existing surveys.

scholarly journals The Local Group census: IC-10

2003 ◽  
Vol 212 ◽  
pp. 581-582 ◽  
Author(s):  
Shelley A. Wright ◽  
Robert Greimel ◽  
Daniel J. Lennon ◽  
Romano L.M. Corradi ◽  
Nicholas A. Walton
Keyword(s):  
Local Group ◽  
Wide Field ◽  
Irregular Galaxy ◽  
Isaac Newton ◽  
Luminous Blue Variables ◽  
La Palma ◽  
Ic 10 ◽  
Magnitude Diagram ◽  
Isaac Newton Telescope

We have begun a census of various stellar groups in Local Group Galaxies, using the wide field camera on the Isaac Newton Telescope on La Palma. Here we present a preliminary color-magnitude diagram for the dwarf irregular galaxy IC-10. At present time, metallicity of IC-10 is measured to be Z = 0.005 (Garnett 1990). Comparison with recent literature values of reddening and distance suggest that IC-10's distance is ~ 1 Mpc. Our comprehensive wide-field survey encompasses both broad (g′, r′, i′) and narrow-band (O iii, He ii, Hα, S ii, Strömgren y) observations to look for emission-line objects, including Wolf-Rayet stars and Luminous Blue Variables. The analysis also yields the coordinates of massive stars to an accuracy sufficient for follow-up multi-object spectroscopic observations.

Brief summary of Kleť photographic search programme for minor planets

1999 ◽  
Vol 173 ◽  
pp. 189-192
Author(s):  
J. Tichá ◽  
M. Tichý ◽  
Z. Moravec
Keyword(s):  
Ccd Camera ◽  
Minor Planet ◽  
Minor Planets ◽  
Main Belt

AbstractA long-term photographic search programme for minor planets was begun at the Kleť Observatory at the end of seventies using a 0.63-m Maksutov telescope, but with insufficient respect for long-arc follow-up astrometry. More than two thousand provisional designations were given to new Kleť discoveries. Since 1993 targeted follow-up astrometry of Kleť candidates has been performed with a 0.57-m reflector equipped with a CCD camera, and reliable orbits for many previous Kleť discoveries have been determined. The photographic programme results in more than 350 numbered minor planets credited to Kleť, one of the world's most prolific discovery sites. Nearly 50 per cent of them were numbered as a consequence of CCD follow-up observations since 1994.This brief summary describes the results of this Kleť photographic minor planet survey between 1977 and 1996. The majority of the Kleť photographic discoveries are main belt asteroids, but two Amor type asteroids and one Trojan have been found.

scholarly journals New Tools for the Optimized Follow-Up of Imminent Impactors

Universe ◽  
2021 ◽  
Vol 7 (1) ◽  
pp. 10
Author(s):  
Maddalena Mochi ◽  
Giacomo Tommei
Keyword(s):  
Orbit Determination ◽  
Main Belt ◽  
Impact Monitoring ◽  
The Earth ◽  
Current Observation ◽  
Short Period ◽  
Fly Eye ◽  
Near Earth Asteroids ◽  
Near Earth Objects

The solar system is populated with, other than planets, a wide variety of minor bodies, the majority of which are represented by asteroids. Most of their orbits are comprised of those between Mars and Jupiter, thus forming a population named Main Belt. However, some asteroids can run on trajectories that come close to, or even intersect, the orbit of the Earth. These objects are known as Near Earth Asteroids (NEAs) or Near Earth Objects (NEOs) and may entail a risk of collision with our planet. Predicting the occurrence of such collisions as early as possible is the task of Impact Monitoring (IM). Dedicated algorithms are in charge of orbit determination and risk assessment for any detected NEO, but their efficiency is limited in cases in which the object has been observed for a short period of time, as is the case with newly discovered asteroids and, more worryingly, imminent impactors: objects due to hit the Earth, detected only a few days or hours in advance of impacts. This timespan might be too short to take any effective safety countermeasure. For this reason, a necessary improvement of current observation capabilities is underway through the construction of dedicated telescopes, e.g., the NEO Survey Telescope (NEOSTEL), also known as “Fly-Eye”. Thanks to these developments, the number of discovered NEOs and, consequently, imminent impactors detected per year, is expected to increase, thus requiring an improvement of the methods and algorithms used to handle such cases. In this paper we present two new tools, based on the Admissible Region (AR) concept, dedicated to the observers, aiming to facilitate the planning of follow-up observations of NEOs by rapidly assessing the possibility of them being imminent impactors and the remaining visibility time from any given station.

The Isaac Newton Telescope Wide Field Camera survey of the Monoceros Ring: accretion origin or Galactic anomaly?

2005 ◽  
Vol 362 (2) ◽  
pp. 475-488 ◽  
Author(s):  
Blair C. Conn ◽  
Geraint F. Lewis ◽  
Mike J. Irwin ◽  
Rodrigo A. Ibata ◽  
Annette M. N. Ferguson ◽  
...  
Keyword(s):  
Wide Field ◽  
Isaac Newton ◽  
Isaac Newton Telescope

scholarly journals Near-Earth asteroids spectroscopic survey at Isaac Newton Telescope

2019 ◽  
Vol 627 ◽  
pp. A124 ◽  
Author(s):  
M. Popescu ◽  
O. Vaduvescu ◽  
J. de León ◽  
R. M. Gherase ◽  
J. Licandro ◽  
...  
Keyword(s):  
Radiation Effects ◽  
Practical Reasons ◽  
Main Process ◽  
Absolute Deviation ◽  
Orbital Parameters ◽  
Isaac Newton ◽  
General Terms ◽  
Isaac Newton Telescope ◽  
C Complex ◽  
Near Earth Asteroids

Context. The population of near-Earth asteroids (NEAs) shows a large variety of objects in terms of physical and dynamical properties. They are subject to planetary encounters and to strong solar wind and radiation effects. Their study is also motivated by practical reasons regarding space exploration and long-term probability of impact with the Earth. Aims. We aim to spectrally characterize a significant sample of NEAs with sizes in the range of ~0.25–5.5 km (categorized as large), and search for connections between their spectral types and the orbital parameters. Methods. Optical spectra of NEAs were obtained using the Isaac Newton Telescope (INT) equipped with the IDS spectrograph. These observations are analyzed using taxonomic classification and by comparison with laboratory spectra of meteorites. Results. A total number of 76 NEAs were observed. We spectrally classified 44 of them as Q/S-complex, 16 as B/C-complex, eight as V-types, and another eight belong to the remaining taxonomic classes. Our sample contains 27 asteroids categorized as potentially hazardous and 31 possible targets for space missions including (459872) 2014 EK24, (436724) 2011 UW158, and (67367) 2000 LY27. The spectral data corresponding to (276049) 2002 CE26 and (385186) 1994 AW1 shows the 0.7 μm feature which indicates the presence of hydrated minerals on their surface. We report that Q-types have the lowest perihelia (a median value and absolute deviation of 0.797 ± 0.244 AU) and are systematically larger than the S-type asteroids observed in our sample. We explain these observational evidences by thermal fatigue fragmentation as the main process for the rejuvenation of NEA surfaces. Conclusions. In general terms, the taxonomic distribution of our sample is similar to the previous studies and matches the broad groups of the inner main belt asteroids. Nevertheless, we found a wide diversity of spectra compared to the standard taxonomic types.

scholarly journals An Education Program Using Tera-Byte NEA Observation Data

2001 ◽  
Vol 183 ◽  
pp. 245-250
Author(s):  
A. Asami ◽  
D.J. Asher ◽  
T. Hashimoto ◽  
S. Isobe ◽  
S. Nishiyama ◽  
...  
Keyword(s):  
Education Program ◽  
General Public ◽  
Wide Field ◽  
Observation Data ◽  
Main Belt ◽  
Near Earth Asteroids

AbstractThere are three wide-field telescopes at the Bisei Spaceguard Center operated by the Japan Spaceguard Association. These telescopes are dedicated to detect near-earth asteroids and produce several tera-byte data per month. Since these data contain many main-belt asteroids, we will use them for an education program that will allow school pupils and the general public to find new main-belt asteroids. We are now developing a new software for its purpose.

On following up newly-discovered earth-approaching minor planets

1974 ◽  
Vol 22 ◽  
pp. 73-75
Author(s):  
B. G. Marsden
Keyword(s):  
Fast Moving ◽  
Moving Objects ◽  
Information Service ◽  
Recent Experience ◽  
Minor Planets ◽  
Moderate Degree ◽  
Intelligent Action

AbstractRecent experience suggests that it is not necessary to introduce a 24-hour information service for following up discoveries of fast-moving objects. Success can be achieved by intelligent action and only a moderate degree of urgency. There is some interest in making deliberate searches for new Apollo objects and hence a great need for follow-up observations.

scholarly journals The dwarf galaxy population in nearby clusters from the KIWICS survey

2021 ◽  
Vol 507 (4) ◽  
pp. 6045-6060
Author(s):  
Nelvy Choque-Challapa ◽  
J Alfonso L Aguerri ◽  
Pavel E Mancera Piña ◽  
Reynier Peletier ◽  
Aku Venhola ◽  
...  
Keyword(s):  
Dwarf Galaxy ◽  
Structural Parameters ◽  
Wide Field ◽  
Isaac Newton ◽  
Cluster Centre ◽  
Cluster Environment ◽  
Low Mass ◽  
Isaac Newton Telescope ◽  
Galaxy Population ◽  
Inner Region

ABSTRACT We analyse a sample of 12 galaxy clusters, from the Kapteyn IAC WEAVE INT Cluster Survey (KIWICS) looking for dwarf galaxy candidates. By using photometric data in the r and g bands from the Wide Field Camera (WFC) at the 2.5-m Isaac Newton Telescope (INT), we select a sample of bright dwarf galaxies (M$_r\, \le$ −15.5 mag) in each cluster and analyse their spatial distribution, stellar colour, and as well as their Sérsic index and effective radius. We quantify the dwarf fraction inside the R200 radius of each cluster, which ranges from ∼0.7 to ∼0.9. Additionally, when comparing the fraction in the inner region with the outermost region of the clusters, we find that the fraction of dwarfs tends to increase going to the outer regions. We also study the clustercentric distance distribution of dwarf and giant galaxies (M$_r\, \lt $ −19.0 mag), and in half of the clusters of our sample, the dwarfs are distributed in a statistically different way as the giants, with the giant galaxies being closer to the cluster centre. We analyse the stellar colour of the dwarf candidates and quantify the fraction of blue dwarfs inside the R200 radius, which is found to be less than ∼0.4, but increases with distance from the cluster centre. Regarding the structural parameters, the Sérsic index for the dwarfs we visually classify as early-type dwarfs tends to be higher in the inner region of the cluster. These results indicate the role that the cluster environment plays in shaping the observational properties of low-mass haloes.

scholarly journals NEOPAT: Near-Earth Object PATrol program

2001 ◽  
Vol 183 ◽  
pp. 240-244
Author(s):  
Hong-Kyu Moon ◽  
Moo-Young Chun ◽  
Yong-Ik Byun ◽  
Wonyong Han ◽  
Seung-Lee Kim ◽  
...  
Keyword(s):  
High Efficiency ◽  
Wide Field ◽  
Main Belt ◽  
Earth Object ◽  
Data Pipeline ◽  
Wide Field Of View ◽  
Survey System ◽  
Robotic Telescopes ◽  
Astronomical Research

AbstractIn 2000, Korea Astronomy Observatory launched the Near-Earth Object Patrol (NEOPAT) program. NEOPAT has conducted follow-up observations of NEOCP (NEO Confirmation Page) objects and discovered 52 new main-belt asteroids during the observation runs. We initiated collaboration with the Yonsei Survey Telescopes for Astronomical Research (YSTAR) team for NEO search. Wide-field of view, fast read-out time, and fully autonomous data pipeline will enable us to detect and track NEOs with a high efficiency. Scheduled to begin active operations in mid-2001, our survey system is going to be the first network of robotic telescopes for NEO search with automatic access to both hemispheres.

First Results From the Local Group Census: Planetary Nebulae in Sextans B

2003 ◽  
Vol 209 ◽  
pp. 561-561
Author(s):  
R.L.M. Corradi ◽  
L. Magrini ◽  
N. A. Walton ◽  
A. A. Zijlstra ◽  
J. R. Walsh ◽  
...  
Keyword(s):  
Field Survey ◽  
Local Group ◽  
Planetary Nebulae ◽  
Field Of View ◽  
Wide Field ◽  
Isaac Newton ◽  
First Results ◽  
Isaac Newton Telescope

The Local Group Census is a narrowband survey of all the galaxies of the Local Group (LG) with Dec ≥ −30°, being carried out as part of the Isaac Newton Group's Wide Field Survey programme. Observations are being obtained with the Wide Field Camera at the 2.5m Isaac Newton telescope, equipped with a mosaic of four 2k x 4k EEV CCDs covering a field of view of 34′ x 34′.

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