Author Topic: Epsilon launch - SPRINT-A, Sept.14, 2013 (0500UTC)  (Read 136157 times)

Offline input~2

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Online Galactic Penguin SST

GO for launch on Tuesday!  ;D

Launch Time of the Epsilon-1
with SPRINT-A aboard


August 25, 2013 (JST)
Japan Aerospace Exploration Agency (JAXA)

The Japan Aerospace Exploration Agency (JAXA) set the launch time of the first Epsilon Launch Vehicle (Epsilon-1) with the Spectroscopic Planet Observatory for Recognition of Interaction of Atmosphere (SPRINT-A) onboard as follows.


Scheduled launch date: August 27 (Tuesday), 2013 (Japan Standard Time, JST)
Launch time: 1:45:00 p.m. (JST)
Launch time windows: 1:45 p.m. thru 2:30 p.m. (JST)

http://www.jaxa.jp/press/2013/08/20130825_epsilon_e.html
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Offline Prober

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Re: Epsilon launch with SPRINT-A, August 27 2013 (ETD 0445UTC)
« Reply #103 on: 08/25/2013 02:57 pm »
Countdown to launch
http://fanfun.jaxa.jp/countdown/epsilon/index.html

Easy to figure out the launch time with this link.
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Offline input~2

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Re: Epsilon launch with SPRINT-A, August 27 2013 (ETD 0445UTC)
« Reply #104 on: 08/25/2013 06:45 pm »
Countdown to launch
http://fanfun.jaxa.jp/countdown/epsilon/index.html

Easy to figure out the launch time with this link.
Well, at this time this clock seems to indicate a launch 7 hours after the official T0... (ie 1 day and 17 hours left instead of 1 day and 10 hours)

Offline input~2

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« Last Edit: 08/26/2013 03:42 pm by input~2 »

Offline yoichi

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« Last Edit: 08/26/2013 09:08 am by yoichi »

Online Galactic Penguin SST

JAXA has just released a press kit on the rocket and the SPRINT-A telescope - unfortunately only in Japanese at this moment.  :-[
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Offline jcm

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Re: Epsilon launch with SPRINT-A, August 27 2013 (ETD 0445UTC)
« Reply #108 on: 08/26/2013 12:58 pm »
JAXA has just released a press kit on the rocket and the SPRINT-A telescope - unfortunately only in Japanese at this moment.  :-[

Nice!
Just to confirm my understanding: the third stage and the PBS stage
separate (at T+16:48) so the PBS stage is indeed a separate stage and not just an RCS system that stays attached to the KM-V2b?
The one crucial thing that seems to be missing from this kit is the empty mass of the PBS stage (and attached payload adapter?) in orbit - do you happen to have that info?
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Offline edkyle99

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Re: Epsilon launch with SPRINT-A, August 27 2013 (ETD 0445UTC)
« Reply #109 on: 08/26/2013 01:46 pm »
JAXA has just released a press kit on the rocket and the SPRINT-A telescope - unfortunately only in Japanese at this moment.  :-[

Nice!
Just to confirm my understanding: the third stage and the PBS stage
separate (at T+16:48) so the PBS stage is indeed a separate stage and not just an RCS system that stays attached to the KM-V2b?
The one crucial thing that seems to be missing from this kit is the empty mass of the PBS stage (and attached payload adapter?) in orbit - do you happen to have that info?

Google Translate of the document says that the PBS is
"separated from the three-stage motor in the rear end", then mentions use of a "Maruman separation adapter".

 - Ed Kyle

Offline jcm

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Re: Epsilon launch with SPRINT-A, August 27 2013 (ETD 0445UTC)
« Reply #110 on: 08/26/2013 03:06 pm »
JAXA has just released a press kit on the rocket and the SPRINT-A telescope - unfortunately only in Japanese at this moment.  :-[

Nice!
Just to confirm my understanding: the third stage and the PBS stage
separate (at T+16:48) so the PBS stage is indeed a separate stage and not just an RCS system that stays attached to the KM-V2b?
The one crucial thing that seems to be missing from this kit is the empty mass of the PBS stage (and attached payload adapter?) in orbit - do you happen to have that info?

Google Translate of the document says that the PBS is
"separated from the three-stage motor in the rear end", then mentions use of a "Maruman separation adapter".

 - Ed Kyle

Right, by which I assume they mean a Marman clamp!
(which I recently learnt was invented by Zeppo Marx)

The doc also gives a full mass of 0.1 t for the PBS, with 0.1t of propellant,
leaving 0.0t of dry mass :-)  - oh, for an extra decimal place...
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Offline edkyle99

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Re: Epsilon launch with SPRINT-A, August 27 2013 (ETD 0445UTC)
« Reply #111 on: 08/26/2013 03:49 pm »
Right, by which I assume they mean a Marman clamp!
(which I recently learnt was invented by Zeppo Marx)
Marx's company produced the clamp, and "Zeppo" was the first to jump at the idea and he almost certainly refined the product, but an independent inventor reportedly brought the concept to him.  I have yet to find the original inventor's name, but he was described by Mr. Marx has having been flat broke with holes in his shoes, etc..

 - Ed Kyle

Offline jcm

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Re: Epsilon launch with SPRINT-A, August 27 2013 (ETD 0445UTC)
« Reply #112 on: 08/26/2013 05:36 pm »
Right, by which I assume they mean a Marman clamp!
(which I recently learnt was invented by Zeppo Marx)
Marx's company produced the clamp, and "Zeppo" was the first to jump at the idea and he almost certainly refined the product, but an independent inventor reportedly brought the concept to him.  I have yet to find the original inventor's name, but he was described by Mr. Marx has having been flat broke with holes in his shoes, etc..

 - Ed Kyle

Ah, fair enough. 'first produced by' (or perhaps even 'developed') rather than 'invented', then
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Offline Chris Bergin

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Offline robertross

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Offline Da Vinci

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Sorry to put this in the live thread, but there doesn't seem to be a generic Epsilon thread? Anyway, in of the Sprint-A mission, I noticed something in the animations of stage ignition. In both the second and third stage ignition sequences, after nozzle extension but before ignition, something appears to be ejected from the nozzle. Any ideas what this is? Something generally used in solids, or perhaps just artistic licence in the animation?

Offline Fuji

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I noticed something in the animations of stage ignition. In both the second and third stage ignition sequences, after nozzle extension but before ignition, something appears to be ejected from the nozzle. Any ideas what this is? Something generally used in solids, or perhaps just artistic licence in the animation?

jettisonable igniter plug.

Offline Fuji

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Good photos of the rotational laucher  :)
(This potos are shooting the launch rehearsal.)
http://www.isas.jaxa.jp/j/topics/topics/2013/0823.shtml

Today's rotational schedule will be 01:45 UTC (L-3 hours).



Online Galactic Penguin SST

I noticed something in the animations of stage ignition. In both the second and third stage ignition sequences, after nozzle extension but before ignition, something appears to be ejected from the nozzle. Any ideas what this is? Something generally used in solids, or perhaps just artistic licence in the animation?

jettisonable igniter plug.

Apparently it also assists the extension of the nozzle too - never seen such a design before anywhere!

See how it works at http://jda.jaxa.jp/result.php?lang=e&id=d4fe91c7cd31f9062f91e3ed5d407550.
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Offline Fuji

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I noticed something in the animations of stage ignition. In both the second and third stage ignition sequences, after nozzle extension but before ignition, something appears to be ejected from the nozzle. Any ideas what this is? Something generally used in solids, or perhaps just artistic licence in the animation?


jettisonable igniter plug.

Apparently it also assists the extension of the nozzle too - never seen such a design before anywhere!

See how it works at http://jda.jaxa.jp/result.php?lang=e&id=d4fe91c7cd31f9062f91e3ed5d407550.

Thanks, You are right. It' my mistake. It was another one. I'm not watch the video.
These system were introduced from M-V, not new system.

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