小行星54509

Multi tool usebody.skin-minerva .mw-parser-output table.infobox captiontext-align:center
54509 YORP
 Radar image and 3D model
|
发现[1] |
---|
發現者 | 林肯近地小行星研究小組 (LINEAR) |
---|
發現地 | 新墨西哥州索科洛
|
---|
發現日期 | 2000年8月3日 |
---|
編號 |
---|
MPC編號 | 54509 |
---|
命名依據 | YORP效應
|
---|
其它名稱 | 2000 PH5 |
---|
小行星分類 | 阿波羅 阿波羅
|
---|
軌道參數[2] |
---|
曆元 February 4, 2008 (JD 2454500.5) |
遠日點 | 185.007 Gm (1.237 AU) |
---|
近日點 | 115.804 Gm (0.774 AU) |
---|
半長軸 | 150.405 Gm (1.005 AU) |
---|
離心率 | 0.230 |
---|
軌道週期 | 368.218 d (1.01 a) |
---|
平均軌道速度
| 29.31 公里/秒
|
---|
平近點角 | 260.696°
|
---|
軌道傾角 | 1.601°
|
---|
升交點黃經 | 278.392°
|
---|
物理特徵 |
---|
大小 | 150×128×93 m[3] |
---|
恆星週期 | 0.2029 h 12.174 min[4] |
---|
轉軸傾角 | 173°[3] |
---|
極黃緯
| -85°[3] |
---|
極黃經
| 180°[3] |
---|
幾何反照率 | 0.10? |
---|
溫度 | ~278 K
|
---|
絕對星等(H) | 22.7 |
---|
|
54509 YORP (2000 PH5)是位於新墨西哥州索科洛的林肯近地小行星研究小組在2000年8月3日發現的一顆阿波羅近地小行星。測量此天體的自轉速率提供了YORP效應的第一個證據,因此以此效應命名這顆小行星。這顆小行星的自轉速率以 (2.0 ± 0.2) × 10−4度/天增加中,在2001年至2005年,造成比2001年預測的自轉多轉了250°[3]。對小行星的模擬預測認為,當它的自轉速週期達到~20秒時,就會結束這顆小行星的一生。[5]模擬也排除了它在接近地球時,會造成自轉速率增加的可能性[5]。
相關條目
- (1620) Geographos
- (1862) Apollo
- (25143) Itokawa
進階讀物
Mueller, Michael. Surface Properties of Asteroids from Mid-Infrared Observations and Thermophysical Modeling. Doctoral Dissertation. 2007.
外部連結
小行星54509 at the JPL Small-Body Database
Discovery · Orbit diagram · Orbital elements · Physical parameters
參考資料
^ Discovery Circumstances: Numbered Minor Planets
^ The Asteroid Orbital Elements Database
^ 3.03.13.23.33.4 Taylor, Patrick A.; et al.. Spin Rate of Asteroid (54509) 2000 PH5 Increasing Due to the YORP Effect (PDF). Science. 2007-04-13, 316 (5822): 274–277. doi:10.1126/science.1139038.
^ 小行星54509 at the JPL Small-Body Database
Discovery · Orbit diagram · Orbital elements · Physical parameters
^ 5.05.1 Lowry, Stephen C.; et al.. Direct Detection of the Asteroidal YORP Effect (PDF). Science. 2007-04-13, 316 (5822): 272–274. Bibcode:2007Sci...316..272L. PMID 17347414. doi:10.1126/science.1139040. (原始内容 (PDF)存档于2011-07-24).
小行星導航
|
---|
| (54508) 2000 PD4 · 小行星54509 · (54510) 2000 PD7
| |
|
Template:MinorPlanets Footer
0J1104YP6A2fekoDUWRiCt93clhkpm9b58BI,yvF5PU6YvbfXGEllyLm9yfhMrLv A UgleApdsv9xJbK
Popular posts from this blog
Ramiro Burr's New Blog - to go back: www.ramiroburr.com From Latin rock to reggaeton, boleros to blues,Tex-Mex to Tejano, conjunto to corridos and beyond, Ramiro Burr has it covered. If you have a new CD release, a trivia question or are looking for tour info, post a message here or e-mail Ramiro directly at: musicreporter@gmail.com Top Tejano songwriter Luis Silva dead of heart attack at 64 By Ramiro Burr on October 23, 2008 8:40 AM | Permalink | Comments (12) | TrackBacks (0) UPDATE: Luis Silva Funeral Service details released Visitation 4-9 p.m. Saturday, Rosary service 6 p.m. Saturday at Porter Loring, 1101 McCullough Ave Funeral Service 10:30 a.m. Monday St. Anthony De Padua Catholic Church, Burial Service at Chapel Hills, 7735 Gibbs Sprawl Road. Porter Loring (210) 227-8221 Related New Flash: Irma Laura Lopez: long time record promoter killed in accident NewsFlash: 9:02 a.m. (New comments below) Luis Silva , one of the most well-known ...
1 I having trouble getting my ResourceDictionary.MergedDictionaries to load from app.xaml. My WPF app has a static class with a Main defined and startup object set to it. Within Main I created an instance of App and run it. The override OnStartup fires and the mainwindow.cs InitializeComponent gives the error "Message "Cannot find resource named 'MaterialDesignFloatingActionMiniAccentButton'. If I put the resources in the mainwindow.xaml everything is fine, but I wanted them to load at the app level so I they are not in each page. Any help appreciated. public partial class App protected override void OnStartup(StartupEventArgs e) base.OnStartup(e); var app = new MainWindow(); var context = new MainWindowViewModel(); app.DataContext = context; app.Show(); from the Main.. var app = new App(); app.Run(); app.xaml.. <Application x:Class="GS.Server.App" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:...
up vote 2 down vote favorite There is a clear pattern that show for two separate subsets (set of columns); If one value is missing in a column, values of other columns in the same subset are missing for any row. Here is a visualization of missing data My tries up until now, I used ycimpute library to learn from other values, and applied Iterforest. I noted, score of Logistic regression is so weak (0.6) and thought Iterforest might not learn enough or anyway, except from outer subset which might not be enough? for example the subset with 11 columns might learn from the other columns but not from within it's members, and the same goes for the subset with four columns. This bar plot show better quantity of missings So of course, dealing with missings is better than dropping rows because It would affect my prediction which does contain the same missings quantity relatively. Any better way to deal with these ? [EDIT] The nullity pattern is confirmed: machine-learning cor...