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  [Discuss] NASA's Artemis I mission (Orion) (Page 4)

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Author Topic:   [Discuss] NASA's Artemis I mission (Orion)
Robert Pearlman
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posted 05-05-2022 10:18 AM     Click Here to See the Profile for Robert Pearlman   Click Here to Email Robert Pearlman     Edit/Delete Message   Reply w/Quote
NASA plans to conduct another attempt of the wet dress rehearsal in early June to demonstrate the ability to load propellant into the tanks and conduct a full launch countdown ahead of the Artemis I launch this summer.

Robert Pearlman
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posted 05-16-2022 03:01 PM     Click Here to See the Profile for Robert Pearlman   Click Here to Email Robert Pearlman     Edit/Delete Message   Reply w/Quote
NASA release
Artemis I Mission Availability

When Artemis I is ready to launch, a range of personnel from NASA, industry, and several international partners will be poised to support the mission. Before they get to launch day, the alignment of the Earth and Moon will determine when the Space Launch System (SLS) rocket with the uncrewed Orion spacecraft atop it can launch, along with several criteria for rocket and spacecraft performance.

To determine potential launch dates, engineers identified key constraints required to accomplish the mission and keep the spacecraft safe. The resulting launch periods are the days or weeks where the spacecraft and rocket can meet mission objectives. These launch periods account for the complex orbital mechanics involved in launching on a precise trajectory toward the Moon while the Earth is rotating on its axis and the Moon is orbiting Earth each month in its lunar cycle. This results in a pattern of approximately two weeks of launch opportunities, followed by two weeks without launch opportunities.

There are four primary parameters that dictate launch availability within these periods. These key constraints are unique to the Artemis I mission and future launch availability beyond this flight will be determined based on capabilities and trajectories unique to each mission.

  • The launch day must account for the Moon's position in its lunar cycle so that the SLS rocket's upper stage can time the trans-lunar injection burn with enough performance to successfully intercept the "on ramp" for the lunar distant retrograde orbit. The more powerful Exploration Upper Stage on future configurations of the rocket will enable daily, or near-daily, launch opportunities to the Moon, depending on the orbit desired.

  • The resulting trajectory for a given day must ensure Orion is not in darkness for more than 90 minutes at a time so that the solar array wings can receive and convert sunlight to electricity and the spacecraft can maintain an optimal temperature range. Mission planners eliminate potential launch dates that would send Orion into extended eclipses during the flight. This constraint requires knowledge of the Earth, Moon, and Sun along the planned mission trajectory path before the mission ever occurs, as well as an understanding of the Orion spacecraft's battery state of charge before entering an eclipse.

  • The launch date must support a trajectory that allows for the skip entry technique planned during Orion's return to Earth. A skip entry is a maneuver in which the spacecraft dips into the upper part of Earth's atmosphere and use that atmosphere, along with the lift of the capsule, to simultaneously slow down and skip back out of the atmosphere, then reenter for final descent and splashdown. The technique allows engineers to pinpoint Orion's splashdown location and on future missions will help lower the aerodynamic breaking loads astronauts inside the spacecraft will experience, and maintain the spacecraft's structural loads within design limits.

  • The launch date must support daylight conditions for Orion's splashdown to initially assist recovery personnel when they locate, secure, and retrieve the spacecraft from the Pacific Ocean.
The periods below show launch availability through the end of 2022. Mission planners refine the periods based on updated analysis approximately two months before they begin and are subject to change.

July 26 – August 10

  • 13 launch opportunities
  • No launch availability on August 1, 2, and 6
August 23 – September 6 (preliminary)
  • 12 launch opportunities
  • No launch availability on August 30, 31, and Sept. 1
September 20 – October 4 (preliminary)
  • 14 launch opportunities
  • No launch availability on Sept. 29
October 17 – October 31 (preliminary)
  • 11 launch opportunities
  • No launch availability on October 24, 25, 26, and 28
November 12 – November 27 (preliminary)
  • 12 launch opportunities
  • No launch availability on November 20, 21, and 26
December 9 – December 23 (preliminary)
  • 11 launch opportunities
  • No launch availability on December 10, 14, 18, and 23
The calendar also designates whether a launch on a particular date will beshorter in duration, of between 26 and 28 days, or longer in duration, of between 38 and 42 days. The mission duration is varied by performing either a half lap or one and a half laps around the Moon in the distant retrograde orbit before returning to Earth and increases the number of days the mission can launch and meet the above constraints

In addition to the launch opportunities based on orbital mechanics and performance requirements, there also is an operational constraint driven by infrastructure at NASA's Kennedy Space Center in Florida. Because of their size, the sphere-shaped tanks used to store cryogenic propellant at the launch pad can only supply a limited number of launch attempts depending on the type of propellant. Liquid oxygen and liquid hydrogen are loaded in the rocket's core state and upper stage on the day of launch. Should the launch subsequently be called off, there is a minimum of 48 hours until a second launch attempt can be made. There is then a 72-hour minimum before a third attempt can be made, due to the need to resupply the cryogenic storage sphere with more propellant from nearby sources. In any given week, no more than three launch attempts that include core stage tanking can occur.

Robert Pearlman
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posted 05-27-2022 11:56 AM     Click Here to See the Profile for Robert Pearlman   Click Here to Email Robert Pearlman     Edit/Delete Message   Reply w/Quote
NASA has scheduled June 6 (beginning at midnight EDT) for the rollout of the Space Launch System (SLS) back out to Pad 39B.

The next wet dress rehearsal is targeted for no earlier than June 19, pending weather conditions.

Space Cadet Carl
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posted 06-07-2022 08:28 AM     Click Here to See the Profile for Space Cadet Carl   Click Here to Email Space Cadet Carl     Edit/Delete Message   Reply w/Quote
Is an onboard television system installed on Artemis-1 in order to provide live TV transmissions from the Moon?

Robert Pearlman
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posted 06-07-2022 09:32 AM     Click Here to See the Profile for Robert Pearlman   Click Here to Email Robert Pearlman     Edit/Delete Message   Reply w/Quote
According to NASA, there will be both live views inside and outside of Orion as it passes the moon, as well as video being recorded in high resolution and in possible other formats like 3D 360 degree VR.

Blackarrow
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posted 06-07-2022 01:09 PM     Click Here to See the Profile for Blackarrow     Edit/Delete Message   Reply w/Quote
I am reminded of the advice on making chicken soup attributed to the 19th century English cook, Mrs Beeton: "First catch your chicken."

Space Cadet Carl
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posted 06-08-2022 08:18 AM     Click Here to See the Profile for Space Cadet Carl   Click Here to Email Space Cadet Carl     Edit/Delete Message   Reply w/Quote
Correct. I'm also remembering how NASA initially argued that Apollo flights, specifically the Apollo 11 moonwalk really had little reason to be televised because it offered scant engineering return.

Headshot
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posted 06-09-2022 06:48 PM     Click Here to See the Profile for Headshot   Click Here to Email Headshot     Edit/Delete Message   Reply w/Quote
Will the NASA news coverage and television feed of this new wet dress rehearsal be the same as the previous one?

Robert Pearlman
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posted 06-09-2022 07:38 PM     Click Here to See the Profile for Robert Pearlman   Click Here to Email Robert Pearlman     Edit/Delete Message   Reply w/Quote
NASA has yet to announce its coverage plans for the next wet dress rehearsal. When it does, the details will be posted here.

Headshot
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posted 06-09-2022 07:46 PM     Click Here to See the Profile for Headshot   Click Here to Email Headshot     Edit/Delete Message   Reply w/Quote
I hope that it will be better than last time.

Robert Pearlman
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posted 06-10-2022 05:18 PM     Click Here to See the Profile for Robert Pearlman   Click Here to Email Robert Pearlman     Edit/Delete Message   Reply w/Quote
NASA is targeting Saturday, June 18, for the beginning of the next wet dress rehearsal with tanking operations on Monday, June 20.
NASA will provide live coverage of the test [with commentary] on NASA Television media channel, as well as host media calls before and after the wet dress rehearsal test with audio streaming live on the agency's website.
The rehearsal will begin at 5 p.m. EDT Saturday with the "call to stations." On Monday, the launch director and mission management team chair will decide at approximately 7 a.m. EDT if they are "go" to begin tanking. The team will count down to a targeted two-hour test window that opens at 2:40 p.m. EDT.

Robert Pearlman
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posted 06-20-2022 08:52 AM     Click Here to See the Profile for Robert Pearlman   Click Here to Email Robert Pearlman     Edit/Delete Message   Reply w/Quote
A summary timeline for the wet dress rehearsal can be found here. T-0 is now expected at 4:38 p.m. EDT.

Headshot
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posted 06-20-2022 11:19 AM     Click Here to See the Profile for Headshot   Click Here to Email Headshot     Edit/Delete Message   Reply w/Quote
In the camera 813 view, I see a liquid dripping/running off the main engine compartment of the core stage. It is just left of the center line and to the right of the left greenish rectangle. I would hope it is just water condensation and not liquid hydrogen or oxygen.

Robert Pearlman
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posted 06-20-2022 01:10 PM     Click Here to See the Profile for Robert Pearlman   Click Here to Email Robert Pearlman     Edit/Delete Message   Reply w/Quote
What you are seeing is likely condensation.

There is a reported liquid hydrogen leak from the quick disconnect that takes the bleed for the engines, but that is on the opposite side of the rocket from the view cited. Teams are currently evaluating the situation.

Robert Pearlman
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posted 06-20-2022 06:25 PM     Click Here to See the Profile for Robert Pearlman   Click Here to Email Robert Pearlman     Edit/Delete Message   Reply w/Quote
The hydrogen leak continues, but the mission management team and launch teams have completed their polls and are moving forward with a T-10 minute countdown in a modified configuration for the Artemis I wet dress rehearsal.

The hydrogen valve on the core stage has been closed as part of the steps being taken to mask the leak from the computers controlling the terminal count.

New planned T-0 is 7:37 p.m. EDT (2337 GMT).

From Jim Free, NASA's Associate Administrator for Exploration Systems:

We want to get most out of test today, because the more we do, the more we learn. We will get as deep as we can in the count, but may stop to keep SLS and Orion safe.

Robert Pearlman
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posted 06-20-2022 06:38 PM     Click Here to See the Profile for Robert Pearlman   Click Here to Email Robert Pearlman     Edit/Delete Message   Reply w/Quote
Hold at T-29 seconds. Vehicle safing has begun.

The reason for the countdown halting at T-29 seconds is not yet known. The plan had been to continue until T-9 seconds.

Robert Pearlman
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posted 06-20-2022 07:05 PM     Click Here to See the Profile for Robert Pearlman   Click Here to Email Robert Pearlman     Edit/Delete Message   Reply w/Quote
From launch director Charlie Blackwell-Thompson:
Like any tests we run, we'll go take the data, we'll go look at what we got, we'll go look at the couple of things that we didn't get and we'll lay out a plan for how we go forward. Probably a little premature to answer tonight after a long day, but certainly tomorrow we'll be back at it and we'll be looking at the data and laying out how we proceed forward.

Robert Pearlman
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posted 06-23-2022 12:30 PM     Click Here to See the Profile for Robert Pearlman   Click Here to Email Robert Pearlman     Edit/Delete Message   Reply w/Quote
NASA has reviewed the data from the wet dress rehearsal and determined the testing campaign is complete. The agency will roll SLS and Orion back to the Vehicle Assembly Building (VAB) at Kennedy Space Center next week to prepare the rocket and spacecraft for launch and repair the hydrogen leak detected during the practice countdown.

NASA plans to return SLS and Orion to the pad for launch in late August. A specific target launch date will be decided after the work to fix the leak is completed.

Robert Pearlman
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posted 06-24-2022 11:09 AM     Click Here to See the Profile for Robert Pearlman   Click Here to Email Robert Pearlman     Edit/Delete Message   Reply w/Quote
NASA is planning to roll back the Space Launch System to the Vehicle Assembly Building on July 1. There, the rocket will spend five to eight weeks undergoing inspections and a repair to correct for the hydrogen leak.

As of today, a launch attempt in late August is still possible. The first two available windows are Aug. 23 through Sept. 6 and Sept. 19 through Oct. 4. NASA expects to announce the launch date in a few weeks.

Robert Pearlman
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posted 07-02-2022 01:56 PM     Click Here to See the Profile for Robert Pearlman   Click Here to Email Robert Pearlman     Edit/Delete Message   Reply w/Quote
Rollback of the Artemis I Space Launch System and Orion spacecraft was completed between 4:12 a.m. and 2:30 p.m. EDT (0812 and 1830 GMT) on Saturday (July 2).

Robert Pearlman
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posted 07-20-2022 10:49 AM     Click Here to See the Profile for Robert Pearlman   Click Here to Email Robert Pearlman     Edit/Delete Message   Reply w/Quote
NASA is targeting Aug. 29 as the earliest launch date for Artemis I, with additional opportunities on Sept. 2 and Sept. 5. The specific launch date will be set at the flight readiness review in August.

The launch window on Aug. 29 would open at 8:33 a.m. EDT and last 120 minutes. The mission would last 42 days, splashing down on Oct. 10.

On Sept. 2, the window opens at 12:48 p.m. EDT and extends 120 minutes. The mission duration would be 39 days, landing on Oct. 11.

On Sept. 5, the window opens at 5:12 p.m. EDT and extends 90 minutes. The mission would be 42 days, returning to Earth on Oct. 17.

To support an Aug. 29 launch attempt, the Space Launch System (SLS) and Orion spacecraft will need to be rolled back out to launchpad 39B on Aug. 18.

If NASA cannot launch Artemis I by Sept. 5, then the vehicle will need to be rolled back to the Vehicle Assembly Building to service the flight termination system. As a result, the next available attempt might not be Oct. 17 through Oct. 31.

SpaceAngel
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posted 08-22-2022 03:48 PM     Click Here to See the Profile for SpaceAngel   Click Here to Email SpaceAngel     Edit/Delete Message   Reply w/Quote
How long does the launch window extend for next week's launch?

Robert Pearlman
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The Aug. 29 window is open for two hours, from 8:33 a.m. to 10:33 a.m. EDT.

Robert Pearlman
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posted 08-22-2022 06:59 PM     Click Here to See the Profile for Robert Pearlman   Click Here to Email Robert Pearlman     Edit/Delete Message   Reply w/Quote
NASA video
Following the Aug. 22 flight readiness review, NASA managers provide a news update on the Artemis I mission, scheduled to launch at 8:33 a.m. EDT (12:33 UTC), Monday, August 29, 2022.

Participants in the briefing are:

  • Janet Petro, director, Kennedy Space Center
  • Jim Free, associate administrator for Exploration Systems Development Mission Directorate, NASA Headquarters
  • Mike Sarafin, Artemis mission manager, NASA Headquarters
  • Charlie Blackwell-Thompson, Artemis launch director, Exploration Ground Systems Program, Kennedy
  • Howard Hu, Orion Program manager, Johnson
  • Chris Cianciola, Space Launch System Program deputy manager, NASA's Marshall Space Flight Center

Robert Pearlman
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posted 08-24-2022 11:14 AM     Click Here to See the Profile for Robert Pearlman   Click Here to Email Robert Pearlman     Edit/Delete Message   Reply w/Quote
From NASA's Exploration Ground System (via Twitter):
At approximately 9:00 a.m. EDT on Aug. 23, 2022, our NASA astronauts conducted a flyby to honor the launch of Artemis I and check out their potential future ride!

Robert Pearlman
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In response to a question about the serial number for the Artemis I Space Launch System, NASA told Spaceflight Now:
The vehicle does not have a serial number but it has a unique part number. They are the following:
  • SLS Only: 97M62020-001
  • SLS + Orion and Secondary Payloads: 97M62010-001
The program decided to use these numbers instead of a serial number because each vehicle is unique. When the Artemis missions and hardware become more regular in configuration, the use of serial numbers might be used at a later date.

Blackarrow
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posted 08-24-2022 08:17 PM     Click Here to See the Profile for Blackarrow     Edit/Delete Message   Reply w/Quote
Never mind serial numbers, is SLS not long overdue for a proper name, as with Redstone, Atlas, Titan II, Saturn 1B and Saturn V?

davidcwagner
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posted 08-25-2022 12:28 AM     Click Here to See the Profile for davidcwagner   Click Here to Email davidcwagner     Edit/Delete Message   Reply w/Quote
Will the trajectory present a "Blue Marble" view of Antarctica? Hard to tell from NASA diagrams.

SpaceAholic
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posted 08-25-2022 05:26 AM     Click Here to See the Profile for SpaceAholic   Click Here to Email SpaceAholic     Edit/Delete Message   Reply w/Quote
Launch inclination range of 32-38 degrees... probably not.

Robert Pearlman
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posted 08-25-2022 07:59 AM     Click Here to See the Profile for Robert Pearlman   Click Here to Email Robert Pearlman     Edit/Delete Message   Reply w/Quote
From astronaut Drew Morgan (via Twitter):
This week we flew over the Artemis I Space Launch System, thanking the NASA centers across the country that put this moon rocket on Kennedy Space Center's pad and celebrating the upcoming test flight! Official NASA photographer Josh V. shot the first photo followed by views from our cockpit (#3).

SpaceAngel
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posted 08-25-2022 12:22 PM     Click Here to See the Profile for SpaceAngel   Click Here to Email SpaceAngel     Edit/Delete Message   Reply w/Quote
Should there be a delay on Monday's launch; will there another opportunity with 24 or 48 hour turn around?

Robert Pearlman
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posted 08-25-2022 12:29 PM     Click Here to See the Profile for Robert Pearlman   Click Here to Email Robert Pearlman     Edit/Delete Message   Reply w/Quote
If the mission doesn't launch on Aug. 29, then the two backup opportunities before the window closes are Sept. 2 and Sept. 5.

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posted 08-25-2022 01:36 PM     Click Here to See the Profile for Headshot   Click Here to Email Headshot     Edit/Delete Message   Reply w/Quote
What is the current weather forecast for Aug 29th? We are about four days away, so the accuracy should be improving.

Robert Pearlman
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posted 08-25-2022 01:56 PM     Click Here to See the Profile for Robert Pearlman   Click Here to Email Robert Pearlman     Edit/Delete Message   Reply w/Quote
The first official weather forecast for the Artemis I launch calls for a 70 percent chance of favorable conditions on Monday (Aug. 29).
On Sunday, a pattern shift back to southeast flow is expected, which should decrease the coverage of the showers and thunderstorms along the Space Coast. This flow regime will remain in place for the opening of the initial launch window Monday morning. While the overall lightning threat seems low, this onshore flow regime will promote scattered showers across the Atlantic waters through the launch window. As a result, the primary weather concerns for a Monday morning attempt will be the Cumulus Cloud Rule, Surface Electric Fields Rule, and the Flight Through Precipitation constraint.

SkyMan1958
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posted 08-25-2022 05:58 PM     Click Here to See the Profile for SkyMan1958   Click Here to Email SkyMan1958     Edit/Delete Message   Reply w/Quote
Does anyone know who the people (astronauts?) were in the T-38's that flew by the SLS? Thank you!

Robert Pearlman
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posted 08-25-2022 07:28 PM     Click Here to See the Profile for Robert Pearlman   Click Here to Email Robert Pearlman     Edit/Delete Message   Reply w/Quote
I haven't seen a full list, but based on reports from Twitter:
  • Nichole Ayers
  • Jack Hathaway
  • Christina Koch
  • Drew Morgan
On edit: No sooner I posted did I come across this photo, which answers the question. There were four T-38s in the formation and here are eight astronauts (from left to right: Jeremy Hansen, Drew Morgan, Christina Koch, Nichole Ayers, Jack Hathaway, Reid Wiseman, Zena Cardman, AOD pilot and Joe Acaba).
Many NASA Astronauts and astronaut candidates flew to NASA's Kennedy Space Center ahead of launch to check out Orion and the rocket.

Robert Pearlman
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posted 08-26-2022 12:20 PM     Click Here to See the Profile for Robert Pearlman   Click Here to Email Robert Pearlman     Edit/Delete Message   Reply w/Quote
Maxar satellite imagery of Artemis I (via Twitter):
NASA is getting ready for the launch of the SLS rocket which is currently scheduled for August 29. Known as Artemis 1, this will be its first test flight with an uncrewed Orion spacecraft. Here is our satellite view from today, August 25, of the rocket at Launch Complex 39B.

Robert Pearlman
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posted 08-26-2022 12:22 PM     Click Here to See the Profile for Robert Pearlman   Click Here to Email Robert Pearlman     Edit/Delete Message   Reply w/Quote
Office of the Vice President release
Vice President Kamala Harris and Second Gentlemen Doug Emhoff to Travel to Kennedy Space Center, Florida

On Monday, August 29, 2022, Vice President Harris and Second Gentlemen Emhoff will travel to Kennedy Space Center, Florida and attend NASA’s Artemis I launch. The Vice President will deliver remarks and tour Artemis II and Artemis III mission hardware.

Robert Pearlman
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posted 08-28-2022 11:51 PM     Click Here to See the Profile for Robert Pearlman   Click Here to Email Robert Pearlman     Edit/Delete Message   Reply w/Quote
The start of cryo loading has been delayed.

There is presently a greater than 20 percent chance of lightning within 5 nautical miles of the launchpad during the first hour of tanking for the core stage and the first hour of tanking for the ICPS (Interim Cryogenic Propulsion Stage), which violates the tanking constraint.

Robert Pearlman
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posted 08-29-2022 12:16 AM     Click Here to See the Profile for Robert Pearlman   Click Here to Email Robert Pearlman     Edit/Delete Message   Reply w/Quote
The chance of lightning has dropped below the 20 percent constraint, allowing cryo loading to begin.


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