R3D2 (DARPA) – Electron – Mahia – 28.03.2019 22:37 UTC

Автор tnt22, 23.01.2019 01:27:29

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"В России надо жить долго.." (с)
"Вы рисуйте, вы рисуйте, вам зачтётся.." (с)

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https://spaceflightnow.com/2019/03/24/timeline-for-rocket-labs-launch-of-darpas-r3d2-tech-demo-satellite/
ЦитироватьTimeline for Rocket Lab's launch of DARPA's R3D2 tech demo satellite
March 24, 2019 | Stephen Clark

Rocket Lab's light-class Electron launcher is set to take off on its fifthflight from New Zealand, aiming for a 264-mile-high (425-kilometer) orbit with DARPA's R3D2 technology demonstration satellite.

The two-stage, 55-foot-tall (17-meter) rocket is scheduled for liftoff during a four-hour window opening at 6:30 p.m. EDT (2230 GMT) Sunday from Rocket Lab's commercial launch complex on Mahia Peninsula on New Zealand's North Island.

The privately-developed Electron launcher is making its fifth flight after its maiden flight in May 2017 reached space, but faltered before reaching orbit, followed by four successful missions in a row that deployed nanosatellites into low Earth orbit.

Read our mission preview story for details on the launch and the R3D2 satellite.

The timeline posted below is accompanied by animation provided by Rocket Lab that illustrates the approximate appearance of the major flight events.
Спойлер
Data source: Rocket Lab

T-0:00:00: Liftoff


The Electron rocket lifts off on the power of nine kerosene-fueled Rutherford main engines, generating 34,500 pounds of thrust at liftoff and powering up to 41,500 pounds of thrust as the rocket climbs into the upper atmosphere.

T+0:01:20: Max-Q


The Electron rocket experiences the most intense aerodynamic pressures at this phase of flight.

T+0:02:34: MECO


The nine first stage Rutherford main engines shut down after a two-and-a-half minute burn.

T+0:02:37: First Stage Separation


The Electron's first stage separates from its second stage.

T+0:02:41: Second Stage Ignition


The Electron's second stage Rutherford engine ignites to continue the trip into orbit, producing approximately 5,000 pounds of thrust in vacuum.

T+0:03:06: Fairing Jettison


The Electron rocket's payload fairing, which protected the satellites during the initial phase of ascent, jettisons once the rocket is above the dense, lower layers of the atmosphere. The composite 3.9-foot-diameter (1.2-meter) shroud will fall into the Pacific Ocean.

T+0:08:53: SECO


The second stage's Rutherford vacuum engine shuts down after reaching an elliptical parking orbit.

T+0:08:57: Kick Stage Separation

The Electron rocket's kick stage separates from the second stage.

T+0:49:52: Kick Stage Ignition


The kick stage's Curie engine ignites for a 90-second burn to place the mission's CubeSat payloads into a circular 264-mile-high (425-kilometer) orbit with an inclination of 39.5 degrees. The Curie engine burns a proprietary non-toxic "green" propellant and produces about 27 pounds of thrust.

T+0:51:45: Kick Stage Shutdown


The kick stage's Curie engine shuts down after achieving the proper orbit.

T+0:53:15: R3D2 Separation


DARPA's 330-pound (150-kilogram) Radio Frequency Risk Reduction Deployment Demonstration satellite separates from Rocket Lab's Curie kick stage.
[свернуть]

tnt22

ЦитироватьRocket Lab‏Подлинная учетная запись @RocketLab 16:18 PDT - 24 мар. 2019 г.

The team has identified a video transmitter 13dB down with low performance. It's not an issue for flight, but we want to understand why, so we're waiving off for the day. We'll assess and advise a new target lift-off time soon.

tnt22

ЦитироватьPeter Beck‏ @Peter_J_Beck 9 ч. назад

Technically good to fly, as we have redundant links, but we don't know why the performance dropped and that makes me uncomfortable.

tnt22

ЦитироватьRocket Lab‏Подлинная учетная запись @RocketLab 6 ч. назад

Launch update: The team is going to take tomorrow to replace the video transmitter, then we'll be back on the pad to launch @DARPA's R3D2 satellite. Rocket Lab is currently targeting no earlier than 22:30, Tuesday 26 March UTC for launch.


6 ч. назад

No video transmitter = no launch webcast, and we all love a good show!


6 ч. назад

Target launch time conversions:
UTC : 22:30, Tuesday 26 March
NZDT: 11:30, Wednesday 27 March
PDT : 15:30, Tuesday 26 March
EDT : 18:30, Tuesday 26 March

tnt22

ЦитироватьRadio Frequency Risk Reduction Deployment Demonstration (R3D2)

DARPAtv

Опубликовано: 22 мар. 2019 г.

DARPA's Radio Frequency Risk Reduction Deployment Demonstration (R3D2) will space-qualify a new type of membrane reflectarray antenna. The antenna, made of a tissue-thin Kapton membrane, packs tightly for stowage during launch and then will deploy to its full size of 2.25 meters in diameter once it reaches low-Earth orbit.
https://www.youtube.com/watch?v=Rxb45tE8Edchttps://www.youtube.com/watch?v=Rxb45tE8Edc (1:43)

tnt22

ЦитироватьRocket Lab‏Подлинная учетная запись @RocketLab 3 ч. назад

Launch update: The video transmitter on Electron has been replaced, tested and confirmed as go for launch! The ground winds are high at LC-1 tomorrow though, so Rocket Lab is currently targeting no earlier than 22:30, Weds 27 March UTC for the @DARPA #R3D2 launch.


3 ч. назад

Timezone conversions:

NZDT: 11:30 am, Thursday 28 March
PDT : 15:30, Wednesday 27 March
EDT : 18:30, Wednesday 27 March

tnt22

Очередной перенос
ЦитироватьRocket Lab‏Подлинная учетная запись @RocketLab 13:22 PDT - 26 мар. 2019 г.

A weather & COLA window (space traffic) briefing has been completed for the @DARPA R3D2 launch from LC-1. With limited COLA windows and a high chance (45%) of violating weather criteria tomorrow, launch is now planned for no earlier than 22:30 UTC, 28 March.

tnt22

ЦитироватьPeter Beck‏ @Peter_J_Beck 16:10 PDT - 26 мар. 2019 г.

We were only going to get 2x 15 min launch windows tomorrow due to space traffic and would have to thread the needle between weather events. #LaunchIsMoreThanARocket

tnt22

ЦитироватьJeff Foust‏ @jeff_foust 16:36 PDT - 26 мар. 2019 г.

Having only 30 minutes of a four-hour launch window available because of COLAs seems... unusual.


Peter Beck‏ @Peter_J_Beck 16:43 PDT - 26 мар. 2019 г.

В ответ @jeff_foust

Yea, low inclination and the particular apogee of this flight plays into it. Pretty much all of the windows for this flight have these constraints, so it makes it more important not to layer weather constraints over the top.

tnt22

ЦитироватьPeter Beck‏ @Peter_J_Beck 5 мин. назад

Launch preparations for today's attempt are progressing smoothly. This is a fun mission with a full load on Electron of over 150kg and some very narrow launch windows to hit.

tnt22

ЦитироватьRocket Lab‏Подлинная учетная запись @RocketLab 3 мин. назад

Electron is vertical on the pad and we are currently targeting no earlier than 23:27 UTC for today's @DARPA #R3D2 launch.
Live webcast will be available approx 20 minutes prior to T-0. http://www.rocketlabusa.com/live-stream 

Timezone conversions:
NZDT: 12:27
PDT : 16:27
EDT : 19:27

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