In this work, we report the observations of the long-period comet C/2015 O1 performed on2018 January 29–30 and April 13 with the Nanshan 1-meter wide-field telescope operated by Xinjiang Astronomical Observatory. We ...In this work, we report the observations of the long-period comet C/2015 O1 performed on2018 January 29–30 and April 13 with the Nanshan 1-meter wide-field telescope operated by Xinjiang Astronomical Observatory. We obtain the morphological features of C/2015 O1 using an image enhancement method, and calculate the dust-activity parameter Afρ and the coma color based on photometric analysis. An obvious fan-shaped structure was observed at different observation times. We find that the activity of C/2015 O1 gradually decreases as the comet advances toward perihelion and the observed B-V and V-R colors are consistent with those of other comets.展开更多
High resolution, high signal-to-noise ratio spectra of Comet C/1995 O1 (Hale-Bopp) which provided continuous wavelength coverage from 5500 to 8500 and partial coverage from 4000 to 5500 were obtained with ...High resolution, high signal-to-noise ratio spectra of Comet C/1995 O1 (Hale-Bopp) which provided continuous wavelength coverage from 5500 to 8500 and partial coverage from 4000 to 5500 were obtained with Coudé Echelle Spectrograph at Beijing Astronomical Observ atory on March 26, 28 and April 22, 1997. In the spectra we found 751 emission features among which 577 lines from H, O, Na, C 2, C 3, CN, CH, NH 2, H 2O + were identified.展开更多
The CCD photometric observation of secular periodic comet C/1995 O1 (Hale-Bopp) was carried out at the Sheshan Station of Shanghai Observatory of China. We obtained 23 CCD images on 1996 March 11, April 22 and May 22....The CCD photometric observation of secular periodic comet C/1995 O1 (Hale-Bopp) was carried out at the Sheshan Station of Shanghai Observatory of China. We obtained 23 CCD images on 1996 March 11, April 22 and May 22. We derived the magnitude of the cometary nucleus in V, R bands, and estimated the lower limits of cometary mass and size. The results show that the diameter of nucleus ≈ 5 ～ 10km, which corresponds to a mass of 2 × 10 12～ 3 × 10 13 kg for different parameters when the bulk density is assumed to 1000 kg·m -3.展开更多
The light curve and images of comet Hale-Bopp(C/1995 O1) in Sept. 1996 are studied. It is found that an outburst happened in Sept. 10-11, 1996. The magnitude of the inner coma region increased by 2.1 mag. and 1.4 mag....The light curve and images of comet Hale-Bopp(C/1995 O1) in Sept. 1996 are studied. It is found that an outburst happened in Sept. 10-11, 1996. The magnitude of the inner coma region increased by 2.1 mag. and 1.4 mag. on these two days, respectively. Two globular ejecta were found near the nucleus of the comet in Sept.10 and 11, 1996. By extropolating backward from the ejecta, it is found that the initial time of the outburst was on Sept. 9, 1996 (9.5±0.2UT). The physical reason for this outburst is still uncertain. The projected radial velocities of ejecta are 120m/s and 97m/s.展开更多
基金supported by the program of the light in China’s Western Region (LCWR, Grant No. 2015XBQN-A-02)the National Natural Science Foundation of China (Grant No. 11661161016)+2 种基金the 13th Five-year Informatization Plan of Chinese Academy of Sciences (Grant No. XXH13503–03–107)the Youth Innovation Promotion Association CAS (Grant No. 2018080)the Talent Importing Program offered by the government of Xinjiang Uygur Autonomous Region
文摘In this work, we report the observations of the long-period comet C/2015 O1 performed on2018 January 29–30 and April 13 with the Nanshan 1-meter wide-field telescope operated by Xinjiang Astronomical Observatory. We obtain the morphological features of C/2015 O1 using an image enhancement method, and calculate the dust-activity parameter Afρ and the coma color based on photometric analysis. An obvious fan-shaped structure was observed at different observation times. We find that the activity of C/2015 O1 gradually decreases as the comet advances toward perihelion and the observed B-V and V-R colors are consistent with those of other comets.
文摘High resolution, high signal-to-noise ratio spectra of Comet C/1995 O1 (Hale-Bopp) which provided continuous wavelength coverage from 5500 to 8500 and partial coverage from 4000 to 5500 were obtained with Coudé Echelle Spectrograph at Beijing Astronomical Observ atory on March 26, 28 and April 22, 1997. In the spectra we found 751 emission features among which 577 lines from H, O, Na, C 2, C 3, CN, CH, NH 2, H 2O + were identified.
文摘The CCD photometric observation of secular periodic comet C/1995 O1 (Hale-Bopp) was carried out at the Sheshan Station of Shanghai Observatory of China. We obtained 23 CCD images on 1996 March 11, April 22 and May 22. We derived the magnitude of the cometary nucleus in V, R bands, and estimated the lower limits of cometary mass and size. The results show that the diameter of nucleus ≈ 5 ～ 10km, which corresponds to a mass of 2 × 10 12～ 3 × 10 13 kg for different parameters when the bulk density is assumed to 1000 kg·m -3.
文摘The light curve and images of comet Hale-Bopp(C/1995 O1) in Sept. 1996 are studied. It is found that an outburst happened in Sept. 10-11, 1996. The magnitude of the inner coma region increased by 2.1 mag. and 1.4 mag. on these two days, respectively. Two globular ejecta were found near the nucleus of the comet in Sept.10 and 11, 1996. By extropolating backward from the ejecta, it is found that the initial time of the outburst was on Sept. 9, 1996 (9.5±0.2UT). The physical reason for this outburst is still uncertain. The projected radial velocities of ejecta are 120m/s and 97m/s.
