QQ登录

只需一步,快速开始

[酷图] 哈勃拍摄的寒冷女神“塞德娜”!!(超大)

[复制链接]
meteorobs 发表于 2004-4-18 23:42 | 显示全部楼层 |阅读模式 来自: 中国–天津–天津 联通/八纬路镇彦网吧

马上注册,结交更多好友,享用更多功能,让你轻松玩转社区。

您需要 登录 才可以下载或查看,没有账号?加入牧夫(请注明天文爱好者,否则无法通过审核,请勿使用gmail/outlook/aol/icloud邮箱注册)

×
Sedna Mystery Deepens as Hubble Offers Best Look at Farthest Planetoid

 



This is the clearest-ever view of the farthest object yet discovered in the solar system. The object is unofficially named "Sedna" (after an Inuit goddess of the sea).

[Lower right]

At a distance of over 8 billion miles, Sedna is so far away it is reduced to one picture element (pixel) in this image, taken in high-resolution mode with Hubble's Advanced Camera for Surveys. This image sets an upper limit on Sedna's size of 1,000 miles in diameter. It is surprising that Hubble does not see a suspected moon near the planetoid. Either the moon's not there, or, far less likely, it is being eclipsed by Sedna, or it is transiting Sedna. The gravitational tug of a moon would best explain Sedna's extremely slow rotation of between 20-50 days, as inferred from ground-based photometric observations.

[Lower left]

Hubble took a total of 35 images of Sedna on March 16, 2004. The planetoid appeared to move slightly between exposures, due to the motion of Hubble around Earth and the motion of the Earth around the Sun. Sedna, too, is moving through space, but too slowly for that to be seen in these images. The fact that the object shows this parallax shift between exposures demonstrates that Sedna is a member of the solar system, and hence is far closer to the Earth than the background star (at right) in the same field of view.

[Top]

A plot of Sedna's apparent motion through space from 2003 to 2005 easily demonstrates that it is close enough to be part of the solar system. The looping path isn't real, but is caused by the fact that Earth is orbiting the Sun and so "laps" Sedna, like a faster race car, once every year. This gives the illusion that Sedna is briefly moving backward along its orbit. Called retrograde motion, this projection effect was noted by the ancient Greeks as they plotted the periodic backward motion of nearby Mars.

Credit: NASA, ESA and M. Brown (Caltech)

Image Type: Astronomical/Illustration
STScI-PRC2004-14a:eek: :cool:

2004-14-a-print.jpg

0 Bytes, 下载次数: 633

玄天凌龙 发表于 2004-4-20 22:01 | 显示全部楼层 来自: 中国–黑龙江–大庆 联通
好图~顶
回复 顶~ 砸~

使用道具 举报

活动星图 发表于 2005-11-15 17:29 | 显示全部楼层 来自: 中国–北京–北京 鹏博士BGP
哟!
厉害了!
回复 顶~ 砸~

使用道具 举报

皮侠客 发表于 2005-11-15 21:52 | 显示全部楼层 来自: 中国–辽宁–沈阳–浑南区 联通数据中心
在地面没有机会看清楚了
回复 顶~ 砸~

使用道具 举报

海冥 发表于 2005-11-15 23:29 | 显示全部楼层 来自: 中国–天津–天津 教育网/教育信息网
从哪里搞来的,把网站介绍给我
回复 顶~ 砸~

使用道具 举报

Hall-Bopp 发表于 2005-11-15 23:31 | 显示全部楼层 来自: 中国–天津–天津 教育网/教育信息网
^^
回复 顶~ 砸~

使用道具 举报

nicus 发表于 2012-1-26 20:45 | 显示全部楼层 来自: 中国–广东–广州 珠江宽频
这个看不到图的
回复 顶~ 砸~

使用道具 举报

ILN 发表于 2012-1-26 15:06 | 显示全部楼层 来自: 美国 AT&T网络
上当了.

点评

yes  发表于 2012-1-26 16:58
回复 顶~ 砸~

使用道具 举报

一文钱庄 发表于 2012-1-26 13:58 | 显示全部楼层 来自: 中国–广东–惠州 电信
非常棒!!我顶
回复 顶~ 砸~

使用道具 举报

本版积分规则

APP下載|手机版|爱牧夫天文淘宝店|牧夫天文网 ( 公安备案号21021102000967 )|网站地图|辽ICP备19018387号

GMT+8, 2025-5-29 02:46 , Processed in 0.090998 second(s), 8 queries , Gzip On, Redis On.

Powered by Discuz! X3.5 Licensed

Copyright © 2001-2020, Tencent Cloud.

快速回复 返回顶部 返回列表