1996 PW

1996 PW
发现[1]
發現者NEAT設在夏威夷哈萊亞卡拉火山的自動搜尋望遠鏡
發現日期1996年8月19日
編號
小行星分類海王星外天體[2]
軌道參數[2][3]
曆元 2016年1月13日 (JD 2457400.5)
不確定參數 2
觀測弧506天（1.39年）
遠日點511.78 AU（76.561 T米）
近日點2.54445 AU（380.644 G米）
半長軸257.16 AU（38.471 T米）
離心率0.99011
軌道週期4123.97 yr（1506279 日）
平近點角1.69887°
軌道傾角29.69447°
升交點黃經144.64353°
近日點參數181.6821°
與地球最小軌道相交距離1.53091 AU（229.021 G米）
與木星最小軌道相交距離2.33618 AU（349.488 G米）
物理特徵
大小15 km（反照率0.04，典型的熄火彗星）[1]
8 km（反照率0.15，典型的石質小天體）[1]
自轉週期35.44 h（1.477 d）[2][4]
光譜類型V − R = 0.56 ± 0.04
V − I = 1.03 ± 0.06
V − J = 1.80 ± 0.05
V − H = 2.19 ± 0.05
V − K = 2.32 ± 0.05 [4]
D[4][5]
Ld (SMASSII)[2][6]
絕對星等(H)14.0[2]

1996 PW是有著長週期彗星的軌道，但在被發現的時候沒有顯示彗星活動跡象的太陽系小天體 [4]。模擬顯示，它最有可能是來自歐特雲的天體，其概率與最早是散佈在歐特雲中岩石體的熄火彗星相當[1]。1996 PW的發現，促使理論研究顯示有大約1～2%的歐特雲天體是岩石[1][5]。

1996 PW是在1996年8月9日由近地小行星追蹤（NEAT）設在夏威夷哈萊亞卡拉火山的自動搜尋望遠鏡發現[1]。它是被發現有著典型的長週期彗星軌道，但沒有彗星活動的第一個天體[1]。

1996 PW的自轉週期是35.44 ± 0.02小時，光度曲線有著雙峰值，振幅0.44 ± 0.03等[4]。它的光譜適度的偏紅且毫無特色[7]，分類上是D-型小行星和裸露的彗核[4][5][7]。它的光譜暗示是顆熄火彗星[7]。1996 PW產生粉塵的上限是0.03 kg/s[4]。

相關條目

有著大遠日點的天體：

參考資料

  1. ^ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 Weissman, P. R. & Levison, H. F. (1997). Origin and evolution of the unusual object 1996 PW: Asteroids from the Oort cloud?. The Astrophysical Journal, 488, L133–L136
  2. ^ 2.0 2.1 2.2 2.3 2.4 JPL Small-Body Database Browser: (1996 PW) (1997-12-28 last obs.). 13 June 2014 [29 March 2016]. （原始内容存档于2017-02-26）. 
  3. ^ AstDys-2 Retrieved 2014-10-28
  4. ^ 4.0 4.1 4.2 4.3 4.4 4.5 4.6 Davies, J. K., McBride, N., Green, S. F., Mottola, S., Carsenty, U., Basran, D., Hudson, K. A., & Foster, M. J. (1998). The lightcurve and colors of unusual minor planet 1996 PW （页面存档备份，存于互联网档案馆）. Icarus, 132, 418–430
  5. ^ 5.0 5.1 5.2 Toth, I. (2005). Connections between asteroids and cometary nuclei （页面存档备份，存于互联网档案馆）. Asteroids, Comets, Meteors Proceedings IAU Symposium, 229, 67–96.
  6. ^ Bus, S. J. & Binzel, R. P. (2002). Phase II of the small main-belt asteroid spectroscopic survey – A feature-based taxonomy （页面存档备份，存于互联网档案馆）. Icarus, 158, 146–177.
  7. ^ 7.0 7.1 7.2 Hicks, M. D., Buratti, B. J., Newburn Jr., R. L., & Rabinowitz, D. L. (2000). Physical observations of 1996 PW and 1997 SE5: Extinct comets or D-type asteroids? （页面存档备份，存于互联网档案馆）. Icarus, 143(2), 354–359.

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