Author Topic: US EVA 89 - Nov 01, 2023 ( O’Hara and Moghbeli)  (Read 23921 times)

Offline Targeteer

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Oct. 3, 2023

MEDIA ADVISORY: M23-126

NASA Sets Coverage of Spacewalks, News Conference for Station Upgrades

Two upcoming spacewalks outside the International Space Station to conduct science research and station maintenance will feature NASA astronauts, both first-time spacewalkers.

NASA astronaut Loral O’Hara will participate in spacewalks on Thursday, Oct. 12, and Friday, Oct. 20, with ESA (European Space Agency) astronaut Andreas Mogensen joining her on the first, and NASA astronaut Jasmin Moghbeli joining her on the second.

Agency experts will preview the spacewalks during a news conference at 1 p.m. EDT on Friday, Oct. 6, from NASA’s Johnson Space Center in Houston.
Live coverage of the news conference and spacewalks will air on NASA Television, the NASA app, and the agency’s website.

News conference participants are:
•       Dana Weigel, deputy manager, International Space Station Program, NASA Johnson
•       Elias Myrmo, spacewalk flight director, NASA Johnson
•       Faruq Sabur, U.S. spacewalk 89 officer, NASA Johnson
•       Sandra Fletcher, U.S. spacewalk 90 officer, NASA Johnson

Media interested in participating in person or by phone must contact the Johnson newsroom no later than 10 a.m., Friday, Oct. 6, by calling 281-483-5111 or emailing [email protected]. To ask questions by phone, reporters must dial into the news conference no later than 15 minutes prior to the start of the call. Questions may also be submitted on social media using #AskNASA.

The first spacewalk is scheduled to begin at 10 a.m. and last about six hours with NASA TV coverage beginning at 8:30 a.m.

On Oct. 12, O’Hara and Mogensen will exit the station’s Quest airlock to collect samples for analysis to see whether microorganisms may exist on the exterior of the orbital complex. They also will replace a high-definition camera on the port truss of the station and conduct other maintenance work to prepare for future spacewalks.

O’Hara will serve as extravehicular activity (EVA) crew member 1 and will wear a suit with red stripes. Mogensen will serve as extravehicular crew member 2 and will wear an unmarked suit. U.S. spacewalk 89 will be the first spacewalk for both crew members.

On Oct. 20, O’Hara and Moghbeli will complete the removal of a faulty electronics box, called a Radio Frequency Group, from a communications antenna on the starboard truss of the station and replace one of twelve Trundle Bearing Assemblies on the port truss Solar Alpha Rotary Joint. The bearings enable the station’s solar arrays to rotate properly to track the sun as the station orbits the Earth. During this spacewalk, Moghbeli will serve as EVA crew member 1 and O’Hara will serve as EVA crew member 2. U.S. spacewalk 90 will be the first spacewalk for Moghbeli and second for O’Hara.

The second spacewalk will begin at 7:30 a.m. and last approximately six and a half hours with NASA TV coverage beginning at 6 a.m.

Get breaking news, images and features from the space station on the station blog, Instagram, Facebook, and X.

Learn more about International Space Station research and operations at:

https://www.nasa.gov/station
« Last Edit: 10/30/2023 09:05 am by Targeteer »
Best quote heard during an inspection, "I was unaware that I was the only one who was aware."

Online cohberg

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Re: US EVA 89 - Oct 12, 2023 (O’Hara and Mogensen)
« Reply #1 on: 10/03/2023 05:56 pm »
ISS US EVA 89 - S band RFG Retrieve II
RFG Retrieve + TBA replacement



DOUG EVA Movie




DOUG EVA Steps

EVA 90
1.1 Pre EVA Configuration
1.3 EGRESS
1.4 ---->EV1 Open Thermal Cover and Egress AIL
1.5 ---->EV2 Transfer Crewlock Bag P to EV1, EV1 stow on BRT
1.6 ---->EV2 Transfer Large ORU Bag to EV1
1.7 ---->EV2 Egress AIL, Receive Lg ORU Bag from EV1 and stow on BRT
1.8 ---->EV1 Close AIL Thermal Cover
1.9 ---->Translate out to GREEN hook locations (MM 9180)
1.10 ---->EV2 Stow GREEN Hook on P1 HR 3651
1.11 ---->EV1 Stow GREEN Hook on P1 HR 3652
1.12 ---->EV2 Translate to Port SARJ
1.13 H-FIXTURE REMOVAL (EV1)
1.14 ---->Translate out to P4 2A Mast Canister
1.15 ---->Retrieve PGT with 7116 inch Wobble
1.16 ---->Use PGT to Release H-Fixture Bolts (exactly 1 turns)
1.17 ---->Use PGT to Release H-Fixture Bolts (exactly 11 turns)
1.18 ----> Stow PGT
1.19 ---->Remove H-Fixture, stow in Crewlock Bag P
1.20 ---->Photograph GSE Pad
1.21 ----> Stow Crewlock Bag P on BRT
1.22 BGA SURVEY (EV1)
1.23 ---->Translate to Long HR on Mast Canister left side
1.24 ---->HECA scan GSA Pad Interface, Photograph left side GSE Pad Interface
1.25 ---->Translate to HR on A-frame (near keel pin)
1.26 ---->HECA scan Center Pad Interface, Photograph Center Pad Interface
1.27 ---->Translate to base of A-Frame
1.28 ---->HECA scan SABB Interface, Photograh SABB Interface
1.29 ----> Stow Camera in Crewlock Bag P, Stow on BRT
1.30 CP8 ETHERNET CABLE UNTWIST (EV1)
1.31 ---->Translate to CP8 Worksite, Stow Crewlock Bag P on P1 HR 3681
1.32 ---->Demate P1 <- -> J1 Untwist cable movin I excess slack down to race rini Mate P1 -> <- J1
1.33 ---->Translate to HR 3683 and perform HECA scan
1.34 ---->Retrieve Crewlock Bag P from P1 HR 3681, stow on BRT
1.35 SSRMS and ESP-2 SETUP (EV1)
1.36 ---->Translate to Airlock
1.37 ---->Retrieve Crewlock Bag R, Stow on BRT
1.38 ---->Translate to ESP-2 Worksite, Temp stow Crewlock Bag R on ESP-2 HR 8007
1.39 ---->Remove 1/4-turns fasteners
1.40 TBA REMOVE (EV2)
1.41 ----> Stow Large ORU Bag on top of Cover 1
1.42 ---->Translate and BRT to PSARJ HR 3865
1.43 -->Use PGT with 6 inch wobble
1.44 ---->Release SARJ Cover Bolts 113, 1A (exactly 9 turns)
1.45 ---->Release SARJ Cover Bolts 2A, 2B, 3B (exactly 9 turns)
1.46 ---->Temp stow removed SARJ Cover near P3 HR 3864
1.47 ---->Preposition TBA Bag bundle for access
1.48 ---->Demate TBA Connector P1 (P1 <-1-> Inboard SARJ Ring)
1.49 ---->Mate (SARJ Low Profile Cap ->1<- SARJ Recepticle Jack)
1.50 ---->Mate (NZGL Cap ->1<- TBA NZGL Connector)
1.51 ---->Install French Hook (1) from TBA Bag labeled Degraded on Bearing Package
1.52 ---->Retrieve PGT with 6 inch wobble
1.53 ---->Using PGT Break torque on TBA Bolts 3,1,2 (exactly 1 turns)
1.54 ---->Using PGT Release TBA Bolt 3 (exactly 1 turns)
1.55 ---->Using PGT Release TBA Bolt 1 (exactly 6 turns)
1.56 ---->Using PGT Release TBA Bolt 2 (approx 14 turns)
1.57 ----> Stow PGT
1.58 ---->Remove Bearing Package, Stow in TBA bag labeled Degraded
1.59 ---->Install other French Hook from TBA Bag labled Degraded on Mount Package
1.60 ---->Using PGT Release Bolt 3 (approx 4 turns)
1.61 ---->Remove mount from race ring, Stow in TBA Bag labeled Degraded
1.62 LUBE OUTBOARD RACE RING (EV2)
1.63 ---->Take photos of Outboard SARJ Race Ring
1.64 ---->Retrieve and Prep J-Hook Noule Grease Gun
1.65 ---->Use J-Hook noule gun to grease inner canted surface of outboard ring
1.66 ----> Stow J-Hook Noule Grease Gun between TBA Bags
1.67 ---->Retrieve and Prep Straight Noule Grease Gun
1.68 ---->Use straight noule gun to grease Outer Canted and Datum A surfaces
1.69 ----> Stow Straight Noule Grease Gun between TBA Bags
1.70 TBA INSTALL (EV2)
1.71 ---->Open TBA Bag labled Spare, Retrieve Mount Package of Spare TBA
1.72 ---->Engage mount onto inboard race ring
1.73 ---->Drive by hand Bolt 3 while holding clamping leg closed (exactly 2 turns)
1.74 ---->Retrieve bearing package from Spare TBA Bag, Engage bearing onto mount
1.75 ---->Using PGT drive Bolt 2 (-14 turns)
1.76 ---->Using PGT Drive Bolt 1 to torque (approx 5-6 turns)
1.77 ---->Using PGT drive Bolt 3 (approx 4-5 turns)
1.78 ---->Demate (SARJ Inboard receptacle <-1-> Low Profile Cap), Stow in TBA Bag Spare
1.79 ---->Demate NZGL Cap off of Bearing Package NZGL
1.80 ---->Mate (TBA NZGL ->l<- SARJ Inboard recetacle)
1.81 ---->HECA Survey of TBA Worksite
1.82 ---->Retrieve SARJ Cover 2
1.83 ---->Drive by hand to turns MLI Cover Bolts 3A, 3B, 2A, 2B, Report turns (exactly 1 turns)
1.84 ---->Using PGT with 6 inch wobble, Drive to toque bolts 3A, 3B, 2A, 2B
1.85 ---->Using PGT with 6 inch wobble, Drive bolts 1A, 1B (exactly 1 turns)
1.86 ---->Drive bolts 1A, 1B to torque (2-8 turns), Stow PGT
1.87 ---->Retrieve ORU Bag and stow on BRT
1.88 ->ESP-2 SETUP (EV2)
1.89 ---->Translate to Airlock, Stow Large ORU Bag on A/L Toolbox HR
1.90 ---->Translate to ESP-2 Worksite
1.91 ---->Remove 1/4-turns fasteners-
1.92 ---->Remove MLI Tent from SASA
1.93 ---->Perform baseline inspection of white paint on RFG
1.94 ---->Verify Stachion Cables P1, P9, J1, and J9
1.95 ---->Perform RTV inspection of Wedge Clamp Nuts
1.96 ----> Swap 3/8 inch Deep Socket on Socket Cady with 7/16 inch Wobble Socket on PGT
1.97 ---->Relocate Crewlock Bag R to SASA FRAM HR
1.98 ->SSRMS SETUP (EV1)
1.99 ---->Translate to ESP2 WIF 5
1.100 ---->Retrieve APFR
1.101 ---->On EV1 GO, SSRMS maneuver to APFR Install and Ingress Position
1.102 ---->On SSRMS GO, Install APFR in SSRMS [12,PP,L,6]
1.103 ---->Ingress APFR
1.104 ---->On EV1 GO, SSRMS maneuver to RFG Aft Backoff position
1.105 ---->On EV1 GO, SSRMS maneuver to RFG Approach position
1.106 RFG WEDGE CLAMP RELEASE
1.107 ---->EV1 Remove excess RN from Wedge Clamp Nuts
1.108 ---->EV2 Retrieve EVA Ratchet from Crewlock Bag R, transfer to EV1
1.109 ---->EV2 Retrieve RFG Wrench from Crewlock Bag R
1.110 ---->EV2 Hold RFG Wrench on Bolt Heads as EV1 uses Ratchet to loosen Wedge Clamps (exactly 4 turns each)
1.111 ---->EV1 Transfer EVA Ratchet Wrench to EV2, EV2 stow Ratchet Wrench and RFG Wrench in Crewlock Bag R
1.112 ---->EV2 Position to view RFG release from Stanchion
1.113 ---->EV1 give SSRMS GO for GCA to published RFG Aft Backoff position
1.114 ---->EV1 give SSRMS GO for maneuver to RFG Unstow Backoff position
1.115 ---->EV1 give SSRMS GO for GCA to published RFG Retrieval position
1.116 ---->SSRMS give EV1 GO for RFG removal
1.117 RFG REMOVE
1.118 ---->EV1 Use PGT with 7/16 Rigid to Release RFG Structural Bolts (approx 11 turns)
1.119 ---->EV1 Stow PGT in Swing Arm
1.120 ---->EV1 Remove RFG from Stanchion
1.121 ---->EV1 give SSRMS GO for GCA to clear RFG of stanchion
1.122 ---->EV1 give SSRMS GO for maneuver to Intermediate Position
1.123 ---->EV1 give SSRMS GO for maneuver to Airlock Backoff position
1.124 RFG STOW IN AIL
1.125 ---->EV2 Translate to aft side of AIL, Open Thermal Cover
1.126 ---->EV1 give SSRMS GO to GCA
1.127 ----> S SRM S give EV1 GO for RFG Reorient and RET Swap
1.128 ---->EV1 give SSRMS GO for GCA to align with Airlock and stow RFG
1.129 ---->EV1 give SSRMS GO for maneuver to ESP-2 FWD Backoff position
1.130 ---->EV2 Ingress AIL, Position RFG in Airlock
1.131 ---->EV2 Retrieve Lg ORU Bag from AIL Toolbox, stow in Airlock
1.132 SSRMS and ESP-2 CLEANUP
1.133 ---->EV1 give SSRMS GO for GCA to published APFR Egress and Removal Position
1.134 ---->EV1 on SSRMS GO, egress APFR
1.135 ---->EV1 remove APFR
1.136 ---->EV1 give SSRMS GO for maneuver to EVA Park position
1.137 ---->EV1 Install APFR in ESP-2 WIF 5 [6,PP,F,6]
1.138 ---->EV2 Translate to ESP-2 RFG Worksite
1.139 ---->EV2 Install MLI Tent
1.140 ---->EV1 Translate to Lab HR 0252 to Retrieve Crewlock Bag P
1.141 ---->EV1 Translate to AIL
1.142 ---->EV2 Retreive Crewlock Bag R, stow on BRT
1.143 ---->EV2 Translate to Airlock
1.144 INGRESS
1.145 ---->EV2 Ingress Airlock
1.146 ---->EV1 transfer Crewlock Bag P to EV2
1.147 ---->EV1 Ingress Airlock

EVA 90 - Get Aheads
2.1 Pre EVA Configuration
2.3 SSRMS ELBOW JOINT PREP (EV2)
2.4 ---->Translate to spare LEE Joint on ESP-2 MUZenith
2.5 ---->Release MLI to access Expandable Diameter Fastener's (EDF's)
2.6 ---->Reposition for driving EDFs
2.7 ---->Use PGT [B7, CCW2, 30.5] to Release EDFs 4, 5, and 6 (approx 5.5 turns each)
2.8 ---->Pull lanyards for EDFs 4, 5, and 6
2.9 ---->Fully insert EDFs 4, 5, and 6 back into their respective receptacles
2.10 ---->Verify spare joint angle at 0 degrees
2.11 ---->Translate to aft side of spare joint (pitch joint bolt)
2.12 ---->Move release handle from MOTOR to EVA
2.13 ---->Use PGT [Al, CCW2, 30.5] with 2" Rigid, Drive Pitch Joint Bolt (approx 20 turns)
2.14 ---->Verify spare joint angle at 6 degrees
2.15 ---->Stow PGT in swing arm
2.16 ---->Move release handle from EVA back to MOTOR
2.17 ---->Cover spare joint with MLI
2.18 ---->Translate to AIL
2.19 4A (P4) ORU TORQUE RESET (EV1)
2.20 ---->Translate to P4 4A lEA, temp stow bag(s)
2.21 ---->Retrieve Ratchet Wrench with 7116 x 6 inch Wobble
2.22 ->RE SET TORQUE ON PFCS
2.23 ---->Release with Ratchet Wrench H3, and H4 with no more than half a turn (0.25-0.5 turns)
2.24 ---->Use PGT [A6, CW2, 30.5] to drive bolts H4, and H3 (less than 1 turns)
2.25 ->RE SET TORQUE ON DCSU
2.26 ---->Release with Ratchet Wrench H1, and H2 with no more than half a turn (0.25 - 0.5 turns)
2.27 ---->Use PGT [A6, CW2, 30.5] to drive bolts H2, and H1 (less than 1 turns)
2.28 ->RE SET TORQUE ON DDCU
2.29 ---->Release with Ratchet Wrench H1, and H2 with no more than half a turn (0.25 - 0.5 turns)
2.30 ---->Use PGT [A6, CW2, 30.5] to drive bolts H2, and H1 (less than 1 turns)
2.31 ->RE SET TORQUE ON BCDU 4A1
2.32 ---->Release with Ratchet Wrench H1, and H2 with no more than half a turn (0.25 - 0.5 turns)
2.33 ---->Use PGT [A6, CW2, 30.5] to drive bolts H2, and H1 (less than 1 turns)
2.34 ----> Stow PGT in swing arm, and Ratchet Wrench and/or Scoop in Crewlock Bag
2.35 ---->Translate to AIL
2.36 (P4) TORQUE RESET
2.37 ---->Translate to P4 2A [EA, temp stow bag(s)
2.38 ---->Retrieve Ratchet Wrench with 7/16 x 6 inch Wobble
2.39 ->RE SET TORQUE ON BCDU 2A1
2.40 ---->Release with Ratchet Wrench H1, and H2 with no more than half a turn (0.25 - 0.5 turns)
2.41 ---->Use PGT [A6, CCW2, 30.5] to drive bolts H2, and H1 (less than 1 turns)
2.42 ->RE SET TORQUE ON BCDU 2A2
2.43 ---->Release with Ratchet Wrench H1, and H2 with no more than half a turn (0.25 - 0.5 turns)
2.44 ---->Use PGT [A6, CCW2, 30.5] to drive bolts H2, and H1 (less than 1 turns)
2.45 ->RE SET TORQUE ON BCDU 2A3
2.46 ---->Release with Ratchet Wrench H1, and H2 with no more than half a turn (0.25 - 0.5 turns)
2.47 ---->Use PGT [A6, CCW2, 30.5] to drive bolts H2, and H1 (less than 1 turns)
2.48 ->RE SET TORQUE ON DDCU
2.49 ---->Release with Ratchet Wrench H1, and H2 with no more than half a turn (0.25 - 0.5 turns)
2.50 ---->Use PGT [A6, CCW2, 30.5] to drive bolts H2, and H1 (less than 1 turns)
2.51 ->RE SET TORQUE ON DCSU
2.52 ---->Release with Ratchet Wrench H1, and H2 with no more than half a turn (0.25 - 0.5 turns)
2.53 ---->Use PGT [A6, CCW2, 30.5] to drive bolts H2, and H1 (less than 1 turns)
2.54 ->RE SET TORQUE ON PFCS
2.55 ---->Release with Ratchet Wrench H3, and H4 with no more than half a turn (0.25-0.5 turns)
2.56 ---->Use PGT [A6, CW2, 30.5] to drive bolts H4, and H3 (less than 1 turns)
2.57 ----> Stow PGT in swing arm, and Ratchet Wrench and/or Scoop in Crewlock Bag
2.58 ---->Translate to AIL
2.59 RELEASE P4 MMOD COVER BOLTS
2.60 ---->Translate to P4 MMOD Cover Bolt 3
2.61 ---->Release Bolts 3, 4, 1, 2
2.62 ---->Translate to A/L
2.63 P1 FHRC LAUNCH STRUT RELEASE / TIE-BACK
2.64 ---->Translate to P1 FHRC
2.65 ---->Release, Tie Back Launch Struts
2.66 ---->Translate to A/L
2.67 SWAPOUT SUSPECT AETs FROM QD BAG (EV1)
2.68 ---->Translate to A/L zenith
2.69 ---->Retrieve/replace old AETs with new AETs from Crewlock Bag
2.70 ---->Translate to crewlock
2.71 CETA CART BRAKE HANDLE RESET (EV1)
2.72 ---->Translate to Stbd CETA Cart Dynamic Brake Handle (Nadir and port Brake Handle)
2.73 ---->Re-engage CETA Cart Brake Handle Locking Collar
2.74 ---->Translate to A/L




Abbreviations


TBA - Trundle Bearing Assembly
RFG - Radio Frequency Group





EVA Tools
EVA Grease Gun
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Relevant Reading
« Last Edit: 10/19/2023 04:12 pm by cohberg »

Offline sdsds

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Re: US EVA 89 - Oct 12, 2023 (O’Hara and Mogensen)
« Reply #2 on: 10/03/2023 09:02 pm »
ISS US EVA 89 - Microorganisms

Fascinating! From one of the linked pdf files, this:
Traces of Barents Sea plankton, bacteria from Madagascar found on ISS surface, TASS, 29 May 2017

Is there another thread for more general discussion of extremophile bacteria, etc.?
— 𝐬𝐝𝐒𝐝𝐬 —

Offline Targeteer

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Re: US EVA 89 - Oct 12, 2023 (O’Hara and Mogensen)
« Reply #3 on: 10/03/2023 10:00 pm »
Jasmine apparently loved being in the EMU today so much CAPCOM jokingly told her she couldn't sleep in it :)
« Last Edit: 10/03/2023 10:00 pm by Targeteer »
Best quote heard during an inspection, "I was unaware that I was the only one who was aware."

Offline vp.

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Re: US EVA 89 - Oct 12, 2023 (O’Hara and Mogensen)
« Reply #4 on: 10/04/2023 11:00 am »

https://www.esa.int/Science_Exploration/Human_and_Robotic_Exploration/First_spacewalk_for_Andreas_Mogensen

"Afterwards both astronauts will move to the Alpha Magnetic Spectrometer (AMS-02) and check a new tool to connect and disconnect cables to the AMS This will prepare the future upgrade of AMS-02."

Does anyone have any information on the upcoming AMS upgrade?

https://twitter.com/astro_luca/status/1638137914944004097

Online AnalogMan

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Re: US EVA 89 - Oct 12, 2023 (O’Hara and Mogensen)
« Reply #5 on: 10/04/2023 01:50 pm »

https://www.esa.int/Science_Exploration/Human_and_Robotic_Exploration/First_spacewalk_for_Andreas_Mogensen

"Afterwards both astronauts will move to the Alpha Magnetic Spectrometer (AMS-02) and check a new tool to connect and disconnect cables to the AMS This will prepare the future upgrade of AMS-02."

Does anyone have any information on the upcoming AMS upgrade?


Boeing’s Mulholland Urges Vocal Advocacy for ISS Amid Budget Gloom
https://spacepolicyonline.com/news/boeings-mulholland-urges-vocal-advocacy-for-iss-amid-budget-gloom/
August 1, 2023

Mulholland also said increased funding is needed to maximize the amount of research conducted on ISS including an upgrade to the Alpha Magnetic Spectrometer-02, or AMS-02, cosmic ray detector that is seeking clues to the nature of dark matter.  AMS-2 was installed on the outside of the ISS in 2011 and astronauts repaired the coolant system during four spacewalks in 2019-2020. Mulholland said an “amazing upgrade that will essentially double the science capability” is planned but will require “almost an entire cargo flight to do it and so it deserves a plus-up in the budget ahead.”



10 Years of operating the Alpha Magnetic Spectrometer on the International Space Station
https://ep-news.web.cern.ch/content/10-years-operating-alpha-magnetic-spectrometer-international-space-station
September 20, 2022

The operation of the International Space Station has now been extended through 2030. Lately, the AMS Collaboration has started working on the upgrade of the AMS detector to profit of the extended ISS lifetime. Progress on the AMS upgrade activities from both the NASA AMS Project Office and the AMS team were presented at the COSPAR2022 scientific assembly. The upgrade aims at increasing the acceptance of the current AMS detector by a factor 300% to match that of its original design by adding a full-size silicon tracker layer on top of the actual detector (Figure 5 left). The upgrade will allow to extend the positron flux measurement from the current 1.4 TeV to 2 TeV, to extend the electron flux measurement from the current 2 TeV to 3 TeV, and to reduce the uncertainties on both measurements by a factor 2 over the entire energy range.
[...]
The construction of the new tracker layer has already started for a targeted launch and installation on the AMS detector in 2025.


"Figure 5 : Left: Sketch of the AMS upgrade with an additional full-size silicon tracker layer on top of the current AMS detector, which will increase the current acceptance by 300% bringing it to the original design value. Right: Two examples of the impact of the upgrade: the electron flux measurement will be extended from 2 TeV to 3 TeV (top), and the positron flux measurement will be extended from 1.4 TeV to 2 TeV (bottom), uncertainties on both measurements will be reduced by a factor 2 over the entire energy range."

[The new Silicon Tracker Layer is 8m2 in area]
« Last Edit: 10/04/2023 02:13 pm by AnalogMan »

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I wonder why this EVA is beginning at 10 am? Usually they start earlier.

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Re: US EVA 89 - Oct 12, 2023 (O’Hara and Mogensen)
« Reply #7 on: 10/04/2023 04:43 pm »
Suit check out by Loral and Andy in the airlock.  I didn't catch the suit numbers.
« Last Edit: 10/04/2023 04:44 pm by Targeteer »
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Re: US EVA 89 - Oct 12, 2023 (O’Hara and Mogensen)
« Reply #8 on: 10/04/2023 04:47 pm »
I wonder why this EVA is beginning at 10 am? Usually they start earlier.

My guess would be comm coverage.  TDRS Z is still unavailable, TDRS-8 is still using Canberra, and orbital tracks over the Russian ground stations may be more available to use the alternate S Band path (shhh something) used in recent EVAs.
Best quote heard during an inspection, "I was unaware that I was the only one who was aware."

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Re: US EVA 89 - Oct 12, 2023 (O’Hara and Mogensen)
« Reply #9 on: 10/04/2023 06:08 pm »
I wonder why this EVA is beginning at 10 am? Usually they start earlier.

My guess would be comm coverage.  TDRS Z is still unavailable, TDRS-8 is still using Canberra, and orbital tracks over the Russian ground stations may be more available to use the alternate S Band path (shhh something) used in recent EVAs.
Spaceflight Tracking and Data Network (STDN, pronounced "stayed in")?
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Re: US EVA 89 - Oct 12, 2023 (O’Hara and Mogensen)
« Reply #10 on: 10/04/2023 10:10 pm »
I wonder why this EVA is beginning at 10 am? Usually they start earlier.

My guess would be comm coverage.  TDRS Z is still unavailable, TDRS-8 is still using Canberra, and orbital tracks over the Russian ground stations may be more available to use the alternate S Band path (shhh something) used in recent EVAs.
Spaceflight Tracking and Data Network (STDN, pronounced "stayed in")?

Because of the TDRS Z outage, some sort of alternate comm path for S Band voice comms during EVAs is being routed through Russian ground stations.  Russian ground coverage conveniently covers the area of -Z loss.  It was used and referred to during a previous EVA(s) this summer.  I commented on it, I thought, during the EVA but can't find my post(s) reviewing the EVA threads.  Earlier this week I heard a Cosmonaut being cleared to disconnect the set up in Node 1, presumably after a test. The Russian name is pronounced Shhhh... something.  Maybe a question can asked by someone, hint hint, during the press conference.
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Re: US EVA 89 - Oct 12, 2023 (O’Hara and Mogensen)
« Reply #11 on: 10/04/2023 11:33 pm »
I wonder why this EVA is beginning at 10 am? Usually they start earlier.

My guess would be comm coverage.  TDRS Z is still unavailable, TDRS-8 is still using Canberra, and orbital tracks over the Russian ground stations may be more available to use the alternate S Band path (shhh something) used in recent EVAs.

I'd been meaning to ask - why does the switch from Guam to Canberra result in a gap in TDRS coverage? Guam's at 145° E, and Canberra's at 149° E, so I wouldn't expect that much of a difference. Does it have to do with the north/south pointing, given that Canberra's further from the Equator?

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Re: US EVA 89 - Oct 12, 2023 (O’Hara and Mogensen)
« Reply #12 on: 10/06/2023 12:35 am »
I wonder why this EVA is beginning at 10 am? Usually they start earlier.

My guess would be comm coverage.  TDRS Z is still unavailable, TDRS-8 is still using Canberra, and orbital tracks over the Russian ground stations may be more available to use the alternate S Band path (shhh something) used in recent EVAs.

I'd been meaning to ask - why does the switch from Guam to Canberra result in a gap in TDRS coverage? Guam's at 145° E, and Canberra's at 149° E, so I wouldn't expect that much of a difference. Does it have to do with the north/south pointing, given that Canberra's further from the Equator?

As I detailed in other threads, the Guam Ground terminal was heavily damaged by a typhoon in June.  Canberra is apparently being used as a stop gap to maintain at least basic command and control/health status monitoring of both TDRS 7 and 8 which otherwise would be out of contact with any suitable ground station. White Sands can't see them which is why the Guam terminal was built to fill the gap between TDRS E and W coverage. https://www.thespacereview.com/article/3234/1 contains the only graphic I can find depicting the gap. Frequent 10-15 minutes LOS periods covered by TDRS-Z indicate, to me, Canberra connectivity cannot provide normal TDRS S band/audio communications support, just satellite command and control. Experts on this forum can probably explain the details.  Canberras normal role is supporting NASA and other agency interplanetary/near earth research missions, not NASA/DOD communication satellites in geosynch...
« Last Edit: 10/06/2023 01:07 am by Targeteer »
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Re: US EVA 89 - Oct 12, 2023 (O’Hara and Mogensen)
« Reply #13 on: 10/06/2023 06:25 pm »
YouTube link to today's spacewalk briefing:



And to the spacewalk animation for EVA 89:


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Re: US EVA 89 - Oct 12, 2023 (O’Hara and Mogensen)
« Reply #14 on: 10/07/2023 12:29 am »
First, bravo to NASA for the hardware show and tell.  It helps bring some clarity.  Second, my annoying posts about TDRS-Z unavailability make "comm losses" during ground based SSRMS control a likelihood.  Once again, the pathetic interest from space reporters was disappointing.
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Re: US EVA 89 - Oct 12, 2023 (O’Hara and Mogensen)
« Reply #15 on: 10/07/2023 12:51 am »
I tried asking a few questions on Xwitter via hashtag-ask-NASA as they keep encouraging us to do, but then they proceeded to only take questions from Facebook, alas...

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Re: US EVA 89 - Oct 12, 2023 (O’Hara and Mogensen)
« Reply #16 on: 10/07/2023 03:29 am »
Some historical context related to the EHDC camera replacement - this seems to be the final step in some work that's been going on across a couple of previous EVAs, to establish better Wi-Fi connectivity on the port side of the station:

 - EVA-73 (13 March 2021, with Victor Glover and Mike Hopkins): they ran Ethernet cables from the rat's nest on the back of the S0 Truss / US Lab area out towards Camera Ports 8 and 9 at the end of the P1 Truss. The CP9 cable was tied off at the base of the lower camera stanchion, while the CP8 cable reel was left partway along its route.
 - EVA-80 (23 March 2022, with Raja Chari and Matthias Maurer): they finished routing the CP8 Ethernet cable out to the upper camera stanchion, installed a new EHDC at CP8 with a built-in Wi-Fi access point, and connected the camera to the Ethernet cable.

Now with EVA-89, they will install a new camera with built-in WAP at CP9 and finally attach it to the cable that Glover left there two and a half years ago. (Longest Ethernet installation job ever, but given how hard it is to get to the worksite, I think they get a pass...) Interestingly, the high-def camera that's currently at CP9 (which was installed back on EVA-45 on 10 October 2017 by Bresnik and Vande Hei) currently sends its video feed wirelessly via the new camera/WAP at CP8!

An article about the setup: https://www.wi-fi.org/beacon/chatwin-lansdowne/nasa-astronauts-install-the-ninth-wi-fi-access-point-outside-space-station

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Re: US EVA 89 - Oct 12, 2023 (O’Hara and Mogensen)
« Reply #17 on: 10/07/2023 04:18 am »
Kind of off-topic from this specific EVA, but while I'm going down the rabbit hole of Wi-Fi access points on Station - it turns out that the camera that now provides the Live High-Definition Views from the ISS feed on YouTube is primarily there to serve as a WAP, with the camera being more of a fringe benefit. That's why it never pans or tilts. And after reading about its installation on EVA-67 (by Chris Cassidy), I finally worked out where the thing actually is - as pointed out by the red arrow in this photo from Woody Hoburg on one of his recent EVAs.

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Re: US EVA 89 - Oct 12, 2023 (O’Hara and Mogensen)
« Reply #18 on: 10/09/2023 11:02 pm »
Might this EVA be delayed to better assist inside with the MLM radiator leak?  Or use SSRMS and/or Dextre for same?
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Re: US EVA 89 - Oct 12, 2023 (O’Hara and Mogensen)
« Reply #19 on: 10/10/2023 05:20 pm »
....or even postponed if there's a risk of toxic? coolant flying around?
« Last Edit: 10/11/2023 07:40 am by litton4 »
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