R*K
发帖数: 310 | 1 MAVEN upon reaching the designated Mars orbit will have only one chance to
enter the the orbit, and if it does not do so, that will be the end. But we
have an additional opportunity. In case we reach on September 24, 2014 and
we are not able to perform the orbit insertion maneuver, we will have
another opportunity after three days of orbiting Mars,” said MoM project
director, M Annadurai.
According to Isro, when a spacecraft reaches the nearest point of Mars (peri
-apsis), it is maneuvered into an elliptical orbit around Mars by firing the
liquid engine. The spacecraft will then move around Mars in an orbit with a
peri-apsis of 366 km and apo-apsis of about 80,000 km.
Annadurai said MAVEN will not have this opportunity, and is a huge advantage
that MOM does, considering that a majority of earlier launched Mars
missions failed during this stage. Russia, for instance, failed on its first
10 attempts, USA six times, while China is yet to enjoy success.
http://bbs.9ifly.cn/forum.php?mod=redirect&goto=findpost&ptid=8 | t**********e
发帖数: 232 | 2 三哥的探测器去火星了？不错。听口气好像没准备进火星轨道。 | b********6
发帖数: 35437 | 3 近地轨道的时候其实是失败了。变轨花了很多燃料
【在 t**********e 的大作中提到】
: 三哥的探测器去火星了？不错。听口气好像没准备进火星轨道。
| l**********r
发帖数: 4612 | 4 现在不是上正轨了吗
【在 b********6 的大作中提到】
: 近地轨道的时候其实是失败了。变轨花了很多燃料
| G*****h
发帖数: 33134 | 5 那到了火星就不用变轨了
一个猛子扎进去完事
【在 b********6 的大作中提到】
: 近地轨道的时候其实是失败了。变轨花了很多燃料
| L**i
发帖数: 22365 | 6 最关键一步还没到呢
记得说是变轨到火星还是哪步一般失败率非常高
三哥没等到这步就浪费了不少燃料 = =
【在 l**********r 的大作中提到】
: 现在不是上正轨了吗
| j**u
发帖数: 1325 | 7 估计不是see you later，而是fair well... | b********6
发帖数: 35437 | 8 火箭的每一步都是精确计算的，每一克燃料都有它的用途
前面火箭没有达到预订轨道，就要消耗预留给后面任务的燃料来变轨
【在 l**********r 的大作中提到】
: 现在不是上正轨了吗
| d****o
发帖数: 32610 | 9 第三次变轨烧了10分钟才把远地点升高到71636km，
这次烧了20分钟就从地球椭圆轨道进到地火转移轨道了？
不对太啊
我算了一下进转移轨道需要的能量比前面所有变轨加起来还要多一半呢
http://en.wikipedia.org/wiki/Mars_Orbiter_Mission
8 November 2013 20:40 UTC Orbit-raising manoeuvres Burn time: 707 sec
Apogee: 40,186 km to 71,636 km
30 November 2013, 19:19 UTC Trans-Mars Injection Burn time: 1328.89
sec Successful | c*****i
发帖数: 11737 | 10 阿三有个屁的火星探测能力
还不是美第幕后操刀
就是为了恶心中国用的：不要觉得你中国探月牛，阿三都能探测火星了，你的探月So
So 啦
we
peri
the
a
【在 R*K 的大作中提到】
: MAVEN upon reaching the designated Mars orbit will have only one chance to
: enter the the orbit, and if it does not do so, that will be the end. But we
: have an additional opportunity. In case we reach on September 24, 2014 and
: we are not able to perform the orbit insertion maneuver, we will have
: another opportunity after three days of orbiting Mars,” said MoM project
: director, M Annadurai.
: According to Isro, when a spacecraft reaches the nearest point of Mars (peri
: -apsis), it is maneuvered into an elliptical orbit around Mars by firing the
: liquid engine. The spacecraft will then move around Mars in an orbit with a
: peri-apsis of 366 km and apo-apsis of about 80,000 km.
| | | c*********e
发帖数: 16335 | 11 能进入绕火星轨道那才叫牛b.好多火星探测器，不是偏离了轨道，就是直接撞上了火星。
we
peri
the
a
【在 R*K 的大作中提到】
: MAVEN upon reaching the designated Mars orbit will have only one chance to
: enter the the orbit, and if it does not do so, that will be the end. But we
: have an additional opportunity. In case we reach on September 24, 2014 and
: we are not able to perform the orbit insertion maneuver, we will have
: another opportunity after three days of orbiting Mars,” said MoM project
: director, M Annadurai.
: According to Isro, when a spacecraft reaches the nearest point of Mars (peri
: -apsis), it is maneuvered into an elliptical orbit around Mars by firing the
: liquid engine. The spacecraft will then move around Mars in an orbit with a
: peri-apsis of 366 km and apo-apsis of about 80,000 km.
| l******r
发帖数: 18699 | 12 尼玛，三弟的太空垃圾都到了火星了
we
peri
the
a
【在 R*K 的大作中提到】
: MAVEN upon reaching the designated Mars orbit will have only one chance to
: enter the the orbit, and if it does not do so, that will be the end. But we
: have an additional opportunity. In case we reach on September 24, 2014 and
: we are not able to perform the orbit insertion maneuver, we will have
: another opportunity after three days of orbiting Mars,” said MoM project
: director, M Annadurai.
: According to Isro, when a spacecraft reaches the nearest point of Mars (peri
: -apsis), it is maneuvered into an elliptical orbit around Mars by firing the
: liquid engine. The spacecraft will then move around Mars in an orbit with a
: peri-apsis of 366 km and apo-apsis of about 80,000 km.
| w*********g
发帖数: 30882 | | D**1
发帖数: 1106 | 14 MAVEN is Nasa's probe, not 3 brother's
we
peri
the
a
【在 R*K 的大作中提到】
: MAVEN upon reaching the designated Mars orbit will have only one chance to
: enter the the orbit, and if it does not do so, that will be the end. But we
: have an additional opportunity. In case we reach on September 24, 2014 and
: we are not able to perform the orbit insertion maneuver, we will have
: another opportunity after three days of orbiting Mars,” said MoM project
: director, M Annadurai.
: According to Isro, when a spacecraft reaches the nearest point of Mars (peri
: -apsis), it is maneuvered into an elliptical orbit around Mars by firing the
: liquid engine. The spacecraft will then move around Mars in an orbit with a
: peri-apsis of 366 km and apo-apsis of about 80,000 km.
| w*p
发帖数: 16484 | 15 三哥是在吹嘘他们的MoM比MAVEN更牛逼
【在 D**1 的大作中提到】
: MAVEN is Nasa's probe, not 3 brother's
:
: we
: peri
: the
: a
| D**1
发帖数: 1106 | 16 lol , shameless
【在 w*p 的大作中提到】
: 三哥是在吹嘘他们的MoM比MAVEN更牛逼
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