本帖最后由 suhuasky 于 2012-12-1 22:20 编辑
是丢失的周期彗星？
New SWAN comet = D/Pons-Gambart
Posted By: maiki666
Sat Dec 1, 2012 6:49 am |
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Hello all,
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SWAN12B
Perihelion 2012 Dec 18.643582 TT; Constraint: e=1
Epoch 2012 Nov 30.0 TT = JDT 2456261.5 Earth MOID: 0.1681 Ne: 0.2845
M 359.99999 (2000.0) P Q
n 0.00000000 Peri. 18.11233 0.58503995 -0.68187281
a <HUGE> Node 320.17748 -0.80270792 -0.56409560
e 0.9999999 Incl. 136.71738 -0.11570754 0.46566685
P!!!!!!! H 10.1 G 0.15 q 0.81972267 Q <HUGE>
From 21 observations 2012 Nov. 29-Dec. 1 (38.9 hr); mean residual 0".556.
D/1827 M1 (Pons-Gambart)
Orbital elements based on the assumed identity with 1110 K1 by
Hasegawa & Nakano (PASJ, 47, 699-710, 1995).
Epoch 2022-01-21
T = 2022-01-31.4 TT
2000.0
q=0.8052 AU peri= 19.4°
node= 320.4°
e=0.9505 incl= 136.4°
Orbital calculations were strictly parabolic in nature until 1917, when
Ogura found the observations were best represented by an elliptical
orbit. His own calculations revealed orbital periods of 46.0 and 63.8
years, with the latter being considered more likely.
Ogura 的观点这是一个椭圆轨道，他计算显示周期可能为46和63.8年，后者可能性更大。
D/1827 M1 (Pons-Gambart)
Discovery This comet was discovered by Jean Louis Pons (Florence, Italy) and Adolphe Gambart (Marseilles, France) on 1827 June 21. Although no system was in place to estimate comet brightnesses at that time, various astronomers have since suggested the comet was then between magnitude 5 and 6.
发现
这个彗星在1827年6月21日由意大利马赛的Jean Louis Pons 和法国的Adolphe Gambart 发现，虽然那时没有系统的测量亮度，但是一些专家估计亮度在5到6等之间。
Historical Highlights Few physical descriptions were published for this comet. Pons was the most prolific observer, measuring three additional positions in June and a total of 17 in July. The comet attained its most northerly declination of +83° on June 26. J. E. B. Valz (Nîmes, France) saw the comet on the morning of July 5 and 6, and on the evening of July 6, with a nearly full moon in the sky. The comet attained its maximum observed elongation of 63° on July 7. The comet was last detected on July 21 by Pons. He said the comet was extremely faint. Pons added that the comet could not be observed thereafter because of its faintness and the fact that it had entered a region of the sky containing numerous nebulosities.
历史集锦
一些公布的信息描述了这颗彗星，Pons有很详细的观察，测量了6月3个和 7月17个位置，彗星6月26日到达赤纬最北端+ 83°，法国Nîmes的J. E. B. Valz 在7月5日和6日早上和7月6日晚上看到这颗彗星，7月6日晚几乎是满月。彗星7月7日到达63度的最大角距。Pons7月21日最后观测到这颗彗星，他说彗星非常暗弱，之后无法观测是因为彗星很模糊，并且进入了包含很多星云的天区。
A month of observations did not generate great interest in examining the orbit of this comet. It was not until 1828 that the first parabolic orbits appeared in the Astronomische Nachrichten. During March, Valz took positions spanning the entire period of visibility and determined the perihelion date as 1827 June 8.83. One month later, A. de Heiligenstein essentially used the same positions and determined a perihelion date of June 8.37. There was no further interest until the 20th century, when, during 1917, S. Ogura took 74 positions spanning the period of visibility, and found the orbit was distinctly elliptical. His best orbit had a perihelion date of June 7.69 and a period of 63.83 years, with a likely uncertainty in the period of +/-10 years. A second orbit with a period of 46.0 years was calculated, but it did not fit the positions as well. S. Nakano reinvestigated the orbit in 1978. He said the 1827 observations were best represented by an orbit with a perihelion date of June 7.64 and a period of 57.46 years, but suggested a probable error of +/-10 years. The comet was considered hopelessly lost. In 1979, I. Hasegawa introduced an interesting twist to the investigation of this orbit. He pointed out that S. Kanda had noted in 1972 that there was a "probable" link between comet Pons-Gambart and a comet seen in 1110. Hasegawa began examining the observations published in ancient Chinese and Korean texts and was able to derive three rough positions, with which he then calculated a parabolic orbit. He confirmed the resemblance to comet Pons-Gambart. Orbital calculations revealed the comet passed closest to the sun on June 8, 1827. Following the discovery it steadily faded. The comet was seen for the final time on July 21 by Pons. Astronomers have suggested the comet was probably then near magnitude 8. Orbital calculations were strictly parabolic in nature until 1917, when Ogura found the observations were best represented by an elliptical orbit. His own calculations revealed orbital periods of 46.0 and 63.8 years, with the latter being considered more likely.
一个月的观测资料对研究这颗彗星的轨道并没有产生很大的关注，直到1828年天文学会新闻才有一个抛物线轨道。3月期间，Valz获得整个可见期的位置，并确定近日点在1827年6月8.83，一个月后，A. de Heiligenstein适应类似的位置数据确定近日点在1827年6月8.37，直到二十世纪前没有更多的关注。1919年期间，S. Ogura搜集了可见期间74个位置数据，发现了冥想的椭圆形轨道。他的改进轨道显示近日点在6月7.69，而且周期为63.83，周期的不确定性有+/-10年。计算的另外一个轨道为周期46年，但并不是很吻合观测数据。S. Nakano9（中野） 在1978年重新复查这个轨道，他说1827年观测资料最好的轨道是近日点是6月7.64，周期57.46年，但指出了坑能的误差+/-10年，估计这彗星已经丢失。1979年，I. Hasegawa（长谷川）发表了对它的轨道一个有趣的转折性研究，他指出S. Kanda1972年已经注意到Pons-Gambart a和1110年观测到的彗星之间的关联。Hasegawa（长谷川）开始研究中国和韩国古代的观测记录文献并从中得到三个粗略位置，然后计算了一个抛物线轨道，他确定和Pons-Gambart彗星的相似，轨道计算显示彗星近日点在1827年6月8日，随后发现它之间暗淡。 Pons最后在7月21日看到这颗彗星，天文学家认为彗星大概接近8等。直到1917年轨道都是按抛物线计算的，Ogura发布找到最吻合观测资料的椭圆轨道观点，他的计算表明，轨道周期为46和63.8年，但后者被认为是最有可能的。
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