中国发现STEREO彗星C2009 G1第一人诞生及彗星经天图。
本帖最后由 星辉 于 2009-4-11 13:57 编辑由阮建高首先在STEREO发现。
http://transientsky.files.wordpress.com/2009/04/stereo_april.png?w=440&h=340
Yet another relatively bright comet has been discovered. Jiangao Ruan of China found the 10th magnitude comet on images taken by the SECCHI HI-1B instrument onboard one of the STEREO spacecraft. The comet was first visible on images taken on April 3 UT. Similar to SOHO (a spacecraft that was used to co-discover Comet C/2009 F6 (Yi-Swan)), the two STEREO spacecraft study the Sun and its immediate environment. Since the comet was found in spacecraft data it is named after the spacecraft, in this case, STEREO. This spacecraft based naming scheme is also used for comets found with the SOHO coronographs (named Comet SOHO) and the SOHO SWAN lyman-alpha imager (named Comet SWAN). The spacecraft data being used for comet discovery is in the public domain and many of the discoverers are amateur astronomers analysing the data on their computers.
This is Mr. Ruan’s 19th comet discovery with all of the his comets being found in data from the SOHO and STEREO spacecraft. All 19 comets have been discovered in the past 11 months. As impressive as that number is, the SOHO spacecraft has been used to find ~1600 comets since 1996. Most of these comets are very faint and are only bright enough to be observed when extremely close to the Sun. Unfortunately, the only place one can observe objects that faint and that close to the Sun is above the Earth’s atmosphere. Some more info on the discovery and movies of the discovery images can be found at the Naval Research Lab’s Sungrazing Comet page.
C/2009 G1 (STEREO) is different from the usual SOHO and STEREO comet. Instead of a small faint comet that only gets bright enough to see because it comes within a few solar radii of the Sun, Comet STEREO is a nice sized comet orbiting the Sun at nearly the same distance as the Earth. With perihelion on April 15 at 1.13 AU from the Sun, the comet is as close to the Sun as it will get. Luckily it will get closer to the Earth over the next 2 months, though it will get no closer than 1.06 AU from Earth. With a current estimated magnitude of ~10.5, the comet may brighten a bit as it gets closer.
The comet is located low in the southeastern sky right before the start of dawn. Moving through Aquarius the comet is much easier to see from the southern hemisphere. The comet’s orbit with an inclination of 108 degrees is carrying it further to the south. It will never be an easy object for northern observers. In fact, within a month it will only be observable from the southern latitudes. 恭喜 阮建高同好，成为STEREO彗星中国第一人。::070821_09.jpg:: 祝贺啊~~::070821_01.jpg:: 看看我国爱好者能不能拍到~
不过以后越来越往南了，要拍得趁早了，虽然还是大月亮。 热烈祝贺，来之不易！ 题目应该换下不够醒目。 COMET C/2009 G1 (STEREO)
K. Kadota (Ageo, Japan) has reported astrometry on Apr. 9.8 UT
with a 25-cm reflector, which shows that the prediction on IAUC
9036 was off by about 4'.He found the comet to have total mag
10.6, a coma diameter of 4'.5, and strong central condensation; his
astrometry and the following revised orbital elements appear on
MPEC 2009-G32:
T = 2009 Apr. 15.093 TT Peri. = 173.823
Node= 120.657 2000.0
q = 1.12993 AU Incl. = 108.091 http://www.astronomie.be/erik.bryssinck/C2009_G1_20090410_Rc_BRY01_full.jpg Yet another relatively bright comet has been discovered. Jiangao Ruan of China found the 10th magnitude comet on images taken by the SECCHI HI-1B instrument onboard one of the STEREO spacecraft. The comet was first visible on images taken on April 3 UT. Similar to SOHO (a spacecraft that was used to co-discover Comet C/2009 F6 (Yi-Swan)), the two STEREO spacecraft study the Sun and its immediate environment. Since the comet was found in spacecraft data it is named after the spacecraft, in this case, STEREO. This spacecraft based naming scheme is also used for comets found with the SOHO coronographs (named Comet SOHO) and the SOHO SWAN lyman-alpha imager (named Comet SWAN). The spacecraft data being used for comet discovery is in the public domain and many of the discoverers are amateur astronomers analysing the data on their computers.
This is Mr. Ruan’s 19th comet discovery with all of the his comets being found in data from the SOHO and STEREO spacecraft. All 19 comets have been discovered in the past 11 months. As impressive as that number is, the SOHO spacecraft has been used to find ~1600 comets since 1996. Most of these comets are very faint and are only bright enough to be observed when extremely close to the Sun. Unfortunately, the only place one can observe objects that faint and that close to the Sun is above the Earth’s atmosphere. Some more info on the discovery and movies of the discovery images can be found at the Naval Research Lab’s Sungrazing Comet page.
C/2009 G1 (STEREO) is different from the usual SOHO and STEREO comet. Instead of a small faint comet that only gets bright enough to see because it comes within a few solar radii of the Sun, Comet STEREO is a nice sized comet orbiting the Sun at nearly the same distance as the Earth. With perihelion on April 15 at 1.13 AU from the Sun, the comet is as close to the Sun as it will get. Luckily it will get closer to the Earth over the next 2 months, though it will get no closer than 1.06 AU from Earth. With a current estimated magnitude of ~10.5, the comet may brighten a bit as it gets closer.
http://transientsky.files.wordpress.com/2009/04/stereo_orbit.png?w=439&h=356 Orbit of Comet C/2009 G1 (STEREO). Position of the comet and planets valid for April 15. Produced with C2A. 终于有人拍到了啊 本帖最后由 星辉 于 2009-4-11 16:09 编辑
不得不佩服日本同仁。他们对彗星的研究世界领先。2009 G1也是南半球的好目标。 本帖最后由 soho1138 于 2009-4-11 16:38 编辑
人气不行啊，看来大家对STEREO彗星还是不很了解啊。
大家注意这个彗星可不是那么简单。普通的soho彗星和STEREO彗星,不能和它相提并论。 图片来源http://www.astronomie.be/erik.bryssinck/menu.html 人气不行啊，看来大家对STEREO彗星还是不很了解啊。
大家注意这个彗星可不是那么简单。普通的soho彗星和STEREO彗星,不能和它相提并论。
soho1138 发表于 2009-4-11 16:31 http://www.astronomy.com.cn/bbs/images/common/back.gif
彗星发现在中国并不是很普及~要达到日本人的高度不是一两代人能做到的啊 ::070821_09.jpg::::070821_09.jpg::::070821_09.jpg::::070821_09.jpg:: ::070821_12.jpg::佩服啊！ 有翻译过来的就好了，网络被电信停了，现在上网非贵，没时间翻译呢 天气不行，好多天没观测了:dizzy:
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