The wavelet transform is applied to studying the near nuclear region of Comet Hale Bopp. The transform suppresses the coma background to enhance visibility of coma features such as jets and shells from which apparent ...The wavelet transform is applied to studying the near nuclear region of Comet Hale Bopp. The transform suppresses the coma background to enhance visibility of coma features such as jets and shells from which apparent expansion speed is measured. Furthermore, two cometary bursts of this comet were found on April 22 and Sept. 10 11. 1996. The latter one coincides with a strong increase in the luminosity in X rays almost at the same time. During the outburst, two globular ejecta were found, and their expanding speeds were about 100m/s. In addition, the projected rotation period is derived.展开更多
Based upon broad-band CCD observation data of comet Hale-Bopp obtained by a 60cm telescope at Xinglong Station of Beijing Astronomical Observatory during March-August, 1996, the photometric results of comet Hale-Bopp ...Based upon broad-band CCD observation data of comet Hale-Bopp obtained by a 60cm telescope at Xinglong Station of Beijing Astronomical Observatory during March-August, 1996, the photometric results of comet Hale-Bopp are reported. Using the photometric results, the dust production rate, radius and mass of nucleus of comet Hale-Bopp are estimated as follows: dM/dt～1.5×10 5 kgs -1, R n～35.5km, and M n～5.65×10 16kg.展开更多
In this paper, we present the observations of Comet Hale-Bopp by means of photoelectric and photographic photometry during the period from September to November of 1996. It is shown that there appears to have been 3 o...In this paper, we present the observations of Comet Hale-Bopp by means of photoelectric and photographic photometry during the period from September to November of 1996. It is shown that there appears to have been 3 outbursts around 24 Sept., 26 Oct. and 13 Nov.; and it is also possible that an event of outburst has taken place around 9 Oct.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
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 long period bright comet C / 1995 O1 (Hale - Bopp) was discovered on July23, 1995 by astronomers A. Hale and T. Bopp. It will pass the perihelion in eariyApril, 1997. We obtained the CCD photometric data of the co...The long period bright comet C / 1995 O1 (Hale - Bopp) was discovered on July23, 1995 by astronomers A. Hale and T. Bopp. It will pass the perihelion in eariyApril, 1997. We obtained the CCD photometric data of the comet from March toDecember, 1996 by using 1.56m telescope of Sheshan Station of Shanghai Observatory.The observational data have been reduced, and according to our data, the orbitalelements and the perturbational ephemeris of the comet have been calculated. In thispaper the processes of reduction and calculation are stated, and the results areanalysed and discussed.展开更多
The long period bright comet C/1995 O1 (Hale-Bopp) was discovered on July 23, 1995 by astronomers A. Hale ahd T. Bopp. It will pass the perihelion in early April, 1997. We obtained the CCD photometric data of the come...The long period bright comet C/1995 O1 (Hale-Bopp) was discovered on July 23, 1995 by astronomers A. Hale ahd T. Bopp. It will pass the perihelion in early April, 1997. We obtained the CCD photometric data of the comet from March to December, 1996 by using 1.56m telescope of Sheshan Station of Shanghai Observatory. The observational data have been reduced, and according to our data, the orbital elements and the perturbational ephemeris of the comet have been calculated. In this paper the processes of reduction and calculation are stated, and the results are analysed and discussed.展开更多
Based upon broad-band CCD observation data of comet Hale-Bopp obtained by a 60 cm telescope at Xinglong Station of Beijing Astronomical Observatory during March-August, 1996, the photometric results of comet Hale-Bopp...Based upon broad-band CCD observation data of comet Hale-Bopp obtained by a 60 cm telescope at Xinglong Station of Beijing Astronomical Observatory during March-August, 1996, the photometric results of comet Hale-Bopp are reported. Using the photometric results, the dust production rate, radius and mass of nucleus of comet Hale-Bopp are estimated as follows: dM/dt × 1.5 × 105 kgs?1, Rn × 35.5 km, and Mn × 5.65 × 1016 kg.展开更多
文摘The wavelet transform is applied to studying the near nuclear region of Comet Hale Bopp. The transform suppresses the coma background to enhance visibility of coma features such as jets and shells from which apparent expansion speed is measured. Furthermore, two cometary bursts of this comet were found on April 22 and Sept. 10 11. 1996. The latter one coincides with a strong increase in the luminosity in X rays almost at the same time. During the outburst, two globular ejecta were found, and their expanding speeds were about 100m/s. In addition, the projected rotation period is derived.
文摘Based upon broad-band CCD observation data of comet Hale-Bopp obtained by a 60cm telescope at Xinglong Station of Beijing Astronomical Observatory during March-August, 1996, the photometric results of comet Hale-Bopp are reported. Using the photometric results, the dust production rate, radius and mass of nucleus of comet Hale-Bopp are estimated as follows: dM/dt～1.5×10 5 kgs -1, R n～35.5km, and M n～5.65×10 16kg.
基金NationalNaturalScienceFoundationofChina (No .195 730 19No .196 5 30 0 1)andbyNaturalScienceFoundationofJiansuProvince
文摘In this paper, we present the observations of Comet Hale-Bopp by means of photoelectric and photographic photometry during the period from September to November of 1996. It is shown that there appears to have been 3 outbursts around 24 Sept., 26 Oct. and 13 Nov.; and it is also possible that an event of outburst has taken place around 9 Oct.
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.
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 long period bright comet C / 1995 O1 (Hale - Bopp) was discovered on July23, 1995 by astronomers A. Hale and T. Bopp. It will pass the perihelion in eariyApril, 1997. We obtained the CCD photometric data of the comet from March toDecember, 1996 by using 1.56m telescope of Sheshan Station of Shanghai Observatory.The observational data have been reduced, and according to our data, the orbitalelements and the perturbational ephemeris of the comet have been calculated. In thispaper the processes of reduction and calculation are stated, and the results areanalysed and discussed.
文摘The long period bright comet C/1995 O1 (Hale-Bopp) was discovered on July 23, 1995 by astronomers A. Hale ahd T. Bopp. It will pass the perihelion in early April, 1997. We obtained the CCD photometric data of the comet from March to December, 1996 by using 1.56m telescope of Sheshan Station of Shanghai Observatory. The observational data have been reduced, and according to our data, the orbital elements and the perturbational ephemeris of the comet have been calculated. In this paper the processes of reduction and calculation are stated, and the results are analysed and discussed.
文摘Based upon broad-band CCD observation data of comet Hale-Bopp obtained by a 60 cm telescope at Xinglong Station of Beijing Astronomical Observatory during March-August, 1996, the photometric results of comet Hale-Bopp are reported. Using the photometric results, the dust production rate, radius and mass of nucleus of comet Hale-Bopp are estimated as follows: dM/dt × 1.5 × 105 kgs?1, Rn × 35.5 km, and Mn × 5.65 × 1016 kg.
