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M Montalto - One of the best experts on this subject based on the ideXlab platform.
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photometry of centaurs and trans neptunian objects 2060 Chiron 1977 ub 10199 chariklo 1997 cu26 38628 huya 2000 eb173 28978 ixion 2001 kx76 and 90482 orcus 2004 dw
Astrophysics and Space Science, 2016Co-Authors: M A Galiazzo, C De La Fuente Marcos, R De La Fuente Marcos, Giovanni Carraro, M Maris, M MontaltoAbstract:Both Centaurs and trans-Neptunian objects (TNOs) are minor bodies found in the outer Solar System. Centaurs are a transient population that moves between the orbits of Jupiter and Neptune, and they probably diffused out of the TNOs. TNOs move mainly beyond Neptune. Some of these objects display episodic cometary behaviour; a few percent of them are known to host binary companions. Here, we study the light-curves of two Centaurs—2060 Chiron (1977 UB) and 10199 Chariklo (1997 CU26)—and three TNOs—38628 Huya (2000 EB173), 28978 Ixion (2001 KX76), and 90482 Orcus (2004 DW)—and the colours of the Centaurs and Huya. Precise, $\sim1~\%$ , $R$ -band absolute CCD photometry of these minor bodies acquired between 2006 and 2011 is presented; the new data are used to investigate the rotation rate of these objects. The colours of the Centaurs and Huya are determined using $\mathit{BVRI}$ photometry. The point spread function of the five minor bodies is analysed, searching for signs of a coma or close companions. Astrometry is also discussed. A periodogram analysis of the light-curves of these objects gives the following rotational periods: $5.5\pm0.4~\mbox{h}$ for Chiron, $7.0\pm 0.6~\mbox{h}$ for Chariklo, $4.45\pm0.07~\mbox{h}$ for Huya, $12.4\pm0.3~\mbox{h}$ for Ixion, and $11.9\pm0.5~\mbox{h}$ for Orcus. The colour indices of Chiron are found to be $B-V=0.53\pm0.05$ , $V-R=0.37\pm0.08$ , and $R-I=0.36\pm0.15$ . The values computed for Chariklo are $V-R=0.62\pm0.07$ and $R-I=0.61\pm0.07$ . For Huya, we find $V-R=0.58\pm0.09$ and $R-I=0.64\pm0.20$ . Our rotation periods are similar to and our colour values are consistent with those already published for these objects. We find very low levels of cometary activity (if any) and no sign of close or wide binary companions for these minor bodies.
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photometry of centaurs and trans neptunian objects 2060 Chiron 1977 ub 10199 chariklo 1997 cu26 38628 huya 2000 eb173 28978 ixion 2001 kx76 and 90482 orcus 2004 dw
arXiv: Earth and Planetary Astrophysics, 2016Co-Authors: M A Galiazzo, C De La Fuente Marcos, R De La Fuente Marcos, Giovanni Carraro, M Maris, M MontaltoAbstract:Both Centaurs and trans-Neptunian objects (TNOs) are minor bodies found in the outer Solar System. Centaurs are a transient population that moves between the orbits of Jupiter and Neptune, and they probably diffused out of the TNOs. TNOs move mainly beyond Neptune. Some of these objects display episodic cometary behaviour; a few percent of them are known to host binary companions. Here, we study the light-curves of two Centaurs -2060 Chiron (1977 UB) and 10199 Chariklo (1997 CU26)- and three TNOs -38628 Huya (2000 EB173), 28978 Ixion (2001 KX76), and 90482 Orcus (2004 DW)- and the colours of the Centaurs and Huya. Precise, ~1%, R-band absolute CCD photometry of these minor bodies acquired between 2006 and 2011 is presented; the new data are used to investigate the rotation rate of these objects. The colours of the Centaurs and Huya are determined using BVRI photometry. The point spread function of the five minor bodies is analysed, searching for signs of a coma or close companions. Astrometry is also discussed. A periodogram analysis of the light-curves of these objects gives the following rotational periods: 5.5+-0.4 h for Chiron, 7.0+-0.6 h for Chariklo, 4.45+-0.07 h for Huya, 12.4+-0.3 h for Ixion, and 11.9+-0.5 h for Orcus. The colour indices of Chiron are found to be B-V=0.53+-0.05, V-R=0.37+-0.08, and R-I=0.36+-0.15. The values computed for Chariklo are V-R=0.62+-0.07 and R-I=0.61+-0.07. For Huya, we find V-R=0.58+-0.09 and R-I=0.64+-0.20. We find very low levels of cometary activity (if any) and no sign of close or wide binary companions for these minor bodies.
Giovanni Carraro - One of the best experts on this subject based on the ideXlab platform.
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photometry of centaurs and trans neptunian objects 2060 Chiron 1977 ub 10199 chariklo 1997 cu26 38628 huya 2000 eb173 28978 ixion 2001 kx76 and 90482 orcus 2004 dw
Astrophysics and Space Science, 2016Co-Authors: M A Galiazzo, C De La Fuente Marcos, R De La Fuente Marcos, Giovanni Carraro, M Maris, M MontaltoAbstract:Both Centaurs and trans-Neptunian objects (TNOs) are minor bodies found in the outer Solar System. Centaurs are a transient population that moves between the orbits of Jupiter and Neptune, and they probably diffused out of the TNOs. TNOs move mainly beyond Neptune. Some of these objects display episodic cometary behaviour; a few percent of them are known to host binary companions. Here, we study the light-curves of two Centaurs—2060 Chiron (1977 UB) and 10199 Chariklo (1997 CU26)—and three TNOs—38628 Huya (2000 EB173), 28978 Ixion (2001 KX76), and 90482 Orcus (2004 DW)—and the colours of the Centaurs and Huya. Precise, $\sim1~\%$ , $R$ -band absolute CCD photometry of these minor bodies acquired between 2006 and 2011 is presented; the new data are used to investigate the rotation rate of these objects. The colours of the Centaurs and Huya are determined using $\mathit{BVRI}$ photometry. The point spread function of the five minor bodies is analysed, searching for signs of a coma or close companions. Astrometry is also discussed. A periodogram analysis of the light-curves of these objects gives the following rotational periods: $5.5\pm0.4~\mbox{h}$ for Chiron, $7.0\pm 0.6~\mbox{h}$ for Chariklo, $4.45\pm0.07~\mbox{h}$ for Huya, $12.4\pm0.3~\mbox{h}$ for Ixion, and $11.9\pm0.5~\mbox{h}$ for Orcus. The colour indices of Chiron are found to be $B-V=0.53\pm0.05$ , $V-R=0.37\pm0.08$ , and $R-I=0.36\pm0.15$ . The values computed for Chariklo are $V-R=0.62\pm0.07$ and $R-I=0.61\pm0.07$ . For Huya, we find $V-R=0.58\pm0.09$ and $R-I=0.64\pm0.20$ . Our rotation periods are similar to and our colour values are consistent with those already published for these objects. We find very low levels of cometary activity (if any) and no sign of close or wide binary companions for these minor bodies.
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photometry of centaurs and trans neptunian objects 2060 Chiron 1977 ub 10199 chariklo 1997 cu26 38628 huya 2000 eb173 28978 ixion 2001 kx76 and 90482 orcus 2004 dw
arXiv: Earth and Planetary Astrophysics, 2016Co-Authors: M A Galiazzo, C De La Fuente Marcos, R De La Fuente Marcos, Giovanni Carraro, M Maris, M MontaltoAbstract:Both Centaurs and trans-Neptunian objects (TNOs) are minor bodies found in the outer Solar System. Centaurs are a transient population that moves between the orbits of Jupiter and Neptune, and they probably diffused out of the TNOs. TNOs move mainly beyond Neptune. Some of these objects display episodic cometary behaviour; a few percent of them are known to host binary companions. Here, we study the light-curves of two Centaurs -2060 Chiron (1977 UB) and 10199 Chariklo (1997 CU26)- and three TNOs -38628 Huya (2000 EB173), 28978 Ixion (2001 KX76), and 90482 Orcus (2004 DW)- and the colours of the Centaurs and Huya. Precise, ~1%, R-band absolute CCD photometry of these minor bodies acquired between 2006 and 2011 is presented; the new data are used to investigate the rotation rate of these objects. The colours of the Centaurs and Huya are determined using BVRI photometry. The point spread function of the five minor bodies is analysed, searching for signs of a coma or close companions. Astrometry is also discussed. A periodogram analysis of the light-curves of these objects gives the following rotational periods: 5.5+-0.4 h for Chiron, 7.0+-0.6 h for Chariklo, 4.45+-0.07 h for Huya, 12.4+-0.3 h for Ixion, and 11.9+-0.5 h for Orcus. The colour indices of Chiron are found to be B-V=0.53+-0.05, V-R=0.37+-0.08, and R-I=0.36+-0.15. The values computed for Chariklo are V-R=0.62+-0.07 and R-I=0.61+-0.07. For Huya, we find V-R=0.58+-0.09 and R-I=0.64+-0.20. We find very low levels of cometary activity (if any) and no sign of close or wide binary companions for these minor bodies.
M A Galiazzo - One of the best experts on this subject based on the ideXlab platform.
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photometry of centaurs and trans neptunian objects 2060 Chiron 1977 ub 10199 chariklo 1997 cu26 38628 huya 2000 eb173 28978 ixion 2001 kx76 and 90482 orcus 2004 dw
Astrophysics and Space Science, 2016Co-Authors: M A Galiazzo, C De La Fuente Marcos, R De La Fuente Marcos, Giovanni Carraro, M Maris, M MontaltoAbstract:Both Centaurs and trans-Neptunian objects (TNOs) are minor bodies found in the outer Solar System. Centaurs are a transient population that moves between the orbits of Jupiter and Neptune, and they probably diffused out of the TNOs. TNOs move mainly beyond Neptune. Some of these objects display episodic cometary behaviour; a few percent of them are known to host binary companions. Here, we study the light-curves of two Centaurs—2060 Chiron (1977 UB) and 10199 Chariklo (1997 CU26)—and three TNOs—38628 Huya (2000 EB173), 28978 Ixion (2001 KX76), and 90482 Orcus (2004 DW)—and the colours of the Centaurs and Huya. Precise, $\sim1~\%$ , $R$ -band absolute CCD photometry of these minor bodies acquired between 2006 and 2011 is presented; the new data are used to investigate the rotation rate of these objects. The colours of the Centaurs and Huya are determined using $\mathit{BVRI}$ photometry. The point spread function of the five minor bodies is analysed, searching for signs of a coma or close companions. Astrometry is also discussed. A periodogram analysis of the light-curves of these objects gives the following rotational periods: $5.5\pm0.4~\mbox{h}$ for Chiron, $7.0\pm 0.6~\mbox{h}$ for Chariklo, $4.45\pm0.07~\mbox{h}$ for Huya, $12.4\pm0.3~\mbox{h}$ for Ixion, and $11.9\pm0.5~\mbox{h}$ for Orcus. The colour indices of Chiron are found to be $B-V=0.53\pm0.05$ , $V-R=0.37\pm0.08$ , and $R-I=0.36\pm0.15$ . The values computed for Chariklo are $V-R=0.62\pm0.07$ and $R-I=0.61\pm0.07$ . For Huya, we find $V-R=0.58\pm0.09$ and $R-I=0.64\pm0.20$ . Our rotation periods are similar to and our colour values are consistent with those already published for these objects. We find very low levels of cometary activity (if any) and no sign of close or wide binary companions for these minor bodies.
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photometry of centaurs and trans neptunian objects 2060 Chiron 1977 ub 10199 chariklo 1997 cu26 38628 huya 2000 eb173 28978 ixion 2001 kx76 and 90482 orcus 2004 dw
arXiv: Earth and Planetary Astrophysics, 2016Co-Authors: M A Galiazzo, C De La Fuente Marcos, R De La Fuente Marcos, Giovanni Carraro, M Maris, M MontaltoAbstract:Both Centaurs and trans-Neptunian objects (TNOs) are minor bodies found in the outer Solar System. Centaurs are a transient population that moves between the orbits of Jupiter and Neptune, and they probably diffused out of the TNOs. TNOs move mainly beyond Neptune. Some of these objects display episodic cometary behaviour; a few percent of them are known to host binary companions. Here, we study the light-curves of two Centaurs -2060 Chiron (1977 UB) and 10199 Chariklo (1997 CU26)- and three TNOs -38628 Huya (2000 EB173), 28978 Ixion (2001 KX76), and 90482 Orcus (2004 DW)- and the colours of the Centaurs and Huya. Precise, ~1%, R-band absolute CCD photometry of these minor bodies acquired between 2006 and 2011 is presented; the new data are used to investigate the rotation rate of these objects. The colours of the Centaurs and Huya are determined using BVRI photometry. The point spread function of the five minor bodies is analysed, searching for signs of a coma or close companions. Astrometry is also discussed. A periodogram analysis of the light-curves of these objects gives the following rotational periods: 5.5+-0.4 h for Chiron, 7.0+-0.6 h for Chariklo, 4.45+-0.07 h for Huya, 12.4+-0.3 h for Ixion, and 11.9+-0.5 h for Orcus. The colour indices of Chiron are found to be B-V=0.53+-0.05, V-R=0.37+-0.08, and R-I=0.36+-0.15. The values computed for Chariklo are V-R=0.62+-0.07 and R-I=0.61+-0.07. For Huya, we find V-R=0.58+-0.09 and R-I=0.64+-0.20. We find very low levels of cometary activity (if any) and no sign of close or wide binary companions for these minor bodies.
Lachlan J M Coin - One of the best experts on this subject based on the ideXlab platform.
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Chiron translating nanopore raw signal directly into nucleotide sequence using deep learning
GigaScience, 2018Co-Authors: Haotian Teng, Michael B Hall, Tania Duarte, Minh Duc Cao, Sheng Wang, Lachlan J M CoinAbstract:Sequencing by translocating DNA fragments through an array of nanopores is a rapidly maturing technology that offers faster and cheaper sequencing than other approaches. However, accurately deciphering the DNA sequence from the noisy and complex electrical signal is challenging. Here, we report Chiron, the first deep learning model to achieve end-to-end basecalling and directly translate the raw signal to DNA sequence without the error-prone segmentation step. Trained with only a small set of 4,000 reads, we show that our model provides state-of-the-art basecalling accuracy, even on previously unseen species. Chiron achieves basecalling speeds of more than 2,000 bases per second using desktop computer graphics processing units.
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Chiron translating nanopore raw signal directly into nucleotide sequence using deep learning
bioRxiv, 2017Co-Authors: Haotien Teng, Michael B Hall, Tania Duarte, Minh Duc Cao, Lachlan J M CoinAbstract:Sequencing by translocating DNA fragments through an array of nanopores is a rapidly maturing technology which offers faster and cheaper sequencing than other approaches. However, accurately deciphering the DNA sequence from the noisy and complex electrical signal is challenging. Here, we report the first deep learning model - Chiron - that can directly translate the raw signal to DNA sequence without the error-prone segmentation step. We show that our model provides state-of-the-art basecalling accuracy when trained with only a small set of 4000 reads. Chiron achieves basecalling speeds of over 2000 bases per second using desktop computer graphics processing units, making it competitive with other deep-learning basecalling algorithms.
S J Bus - One of the best experts on this subject based on the ideXlab platform.
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2060 Chiron evidence for activity near aphelion
Icarus, 2001Co-Authors: S J Bus, Michael F Ahearn, E Bowell, Alan S SternAbstract:Abstract Photographic photometry of (2060) Chiron was carried out using a set of archival plates taken between 1969 and 1977. The data reveal an extensive interval of brightening, presumably due to an increase in cometary activity, when Chiron was near aphelion. This activity substantially exceeded, in both magnitude and duration, the activity observed as Chiron approached perihelion near the end of the 1980s.
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stellar occultation by 2060 Chiron
Icarus, 1996Co-Authors: S J Bus, M W Buie, David G Schleicher, W B Hubbard, R L Marcialis, R E Hill, L H Wasserman, John R Spencer, R L MillisAbstract:Abstract A 14th magnitude double star was occulted by 2060 Chiron on 1993 November 7. Observations of this event were obtained from five locations in California. An occultation by Chiron's nucleus was recorded at one of these sites, while a possible graze by the nucleus was seen at the next closest location. If this possible graze represents a true detection of the nucleus, Chiron's radius is determined to be 89.6 ± 6.8 km, assuming a circular outline for the shape. If the nucleus was not seen at the second location, Chiron's radius is only constrained as being greater than 90.2 ± 6.5 km. The presence of dust in Chiron's inner coma was also detected in four of the five occultation datasets. Lightcurve features were identified that may be explained by narrow, collimated jets of material, and by a much larger region of dust distributed asymmetrically about Chiron's nucleus. Periodic fluctuations in the dust may have been detected in one of the lightcurves. If this periodicity is real, and is induced as a result of Chiron's rotation, then a minimum expansion velocity for the dust is found to be ∼40 m sec−1.
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detection of cn emission from 2060 Chiron
Science, 1991Co-Authors: S J Bus, Michael F Ahearn, David G Schleicher, E BowellAbstract:The detection of CN emission the spectrum of (2060) Chiron not only underscores its cometary nature, but represents, at a heliocentric distance in excess of 11 AU, the most distantly detected instance of a cometary gas species. These observations are noted to be consistent with a driving of Chiron's outgassing by isolated outbursts of CO2 from a small fraction of Chiron's surface. If dusty particles or icy grains are dragged out by the gas with unit dust-to-gas mass ratio, outbursts need occur only once every several months. Such small-surface outgassings appear to characterize comets which have made many passages close to the sun.