Ahead of multi-milestone flight, Falcon 9 scrubs 16th round of Starlinks launch
Just over a day after a SpaceX Falcon 9 rocket carried the American-European Sentinel-6A oceanography… The post Ahead of multi-milestone flight, Falcon 9 scrubs 16th round of Starlinks launch appeared first on NASASpaceFlight.com.
Just over a day after a SpaceX Falcon 9 rocket carried the American-European Sentinel-6A oceanography satellite into orbit from the U.S. West Coast, SpaceX was set to return its focus to the Cape Canaveral Air Force Station in Florida, ahead of the Falcon 9 rocket’s 100th launch.
Liftoff was set for 21:56 EST on Sunday, 22 November (02:56 UTC on Monday, 23 November). However, a hold was called ahead of prop loading, leading to a scrub being announced due to “mission assurance” – pointing to an issue with the rocket.
This mission is aiming to launch the Starlink V1.0 L15 mission (or the 16th flight of Starlink), SpaceX’s latest batch of 60 satellites are scheduled to be lofted into orbit by booster B1049 — marking the company’s first-ever 7th flight of a Falcon 9 first stage.
A multi-milestone flight
B1049 first launched in September 2018, lifting the Canadian Telstar 18 Vantage telecommunications satellite into a geostationary orbit. Just four months later, the booster was reused to complete the Iridium NEXT satellite constellation, launching the final ten satellites into orbit from Vandenberg Air Force Base in California.
Since then, B1049 has been completely dedicated to building SpaceX’s Starlink constellation, having launched starlink V0.9 in May 2019, SpaceX’s first and only batch of 60 V0.9 Starlink test satellites.
With the launch of Starlink V1.0 L15, B1049 will have launched four batches of operational Starlink satellites and will have contributed 238 operational satellites to the constellation.
On B1049’s most recent flight, Starlink V1.0 L10, the stage set the record for having flown the most flights of any Falcon 9 booster (or orbital rocket booster) at six individual flights; on flight L15, it is scheduled to break its own record.
The launch of Starlink V1.0 L15 will also mark another milestone for the Falcon 9: its 100th flight — an accomplishment achieved in just 10 and a half years with a surge of 71 launches in the last three years alone and this years commencement of human launch operations with Demo-2 in May and Crew-1 in November.
Starlink mission overview:
B1049 was rolled out and lifted into a vertical position at Space Launch Complex 40 (SLC-40) on 19 November.
Prior to launch, like most Falcon 9 missions, B1049 performed a static fire test, being held down at the launch pad and igniting its nine Merlin 1D engines for a few seconds to make sure all was in working order.
It was expected the test would occur around 01:30 EST on 20 November, although the firing was aborted due to winds at the launch pad. The test proceeded successfully at approximately 16:00 EST on 21 November, clearing the Falcon 9 for flight.
Launch countdown operations include:
|Time until launch (L-)||Event|
|L-38 minutes||Electronic verification of “GO” for propellant load|
|L-35 minutes||RP-1 kerosene load into Stages 1 & 2 begins
Liquid oxygen load into Stage 1 begins
|L-17 minutes||RP-1 kerosene load into Stage 2 complete|
|L-16 minutes||Liquid oxygen load into Stage 2 begins|
|L-7 minutes||Stage 1 Merlin 1D engine chilldown begins|
|L-2 minutes 30 seconds||Falcon 9 fully fueled for flight|
|L-1 minute||Flight computer takes control
Falcon 9 pressurizes for flight
|L-45 seconds||Flight Director verifies “GO” for launch|
|L-3 seconds||Stage 1 engine ignitions commanded|
After a short vertical climb, Falcon 9 will pitch over and head out on an azimuth — heading — to place itself into a 53 degree inclination orbit.
Once B1049 has completed its 2 minute 32 second burn, the second stage will separate and ignite its Merlin Vac engine, bringing the Starlink payload into orbit.
After stage separation, the first stage booster will orient itself for the three-engine Entry Burn to slow itself down and alter course more towards the drone ship. That burn will complete at T+7 minutes 03 seconds.
That was nice of Falcon 9 B1049.7, waiting to Static Fire until we put a camera on her!
Latest Starlink launch tomorrow.https://t.co/00d6cULy24 pic.twitter.com/CFMcNrB7o5
— Chris B – NSF (@NASASpaceflight) November 21, 2020
A single-engine Landing Burn will then slow the booster and fine-tune its trajectory towards the waiting Of Course I Still Love You rocket-catching drone ship 634 km northeast of the launch pad (supported by GO Quest).
The two payload fairing halfs will likewise parachute down for recovery. The vessels Ms. Chief and GO Searcher will assist in that endeavour.Falcon 9/Starlink v1.0 L15 UPDATES
After a successful landing, the booster will be brought back to Port Canaveral ahead of its 8th flight — which will all but certainly be another Starlink flight given Elon Musk’s comments on “fleet leader boosters” being used for internal missions (the only ones of which at present are the Starlinks).
The approximately 260 kg spacecraft are powered by a single Krypton ion thruster, which allows them to maneuver in orbit efficiently and quickly de-orbit once they reach the end of their lives. Most Starlink spacecraft in the initial deployment are planned to orbit at approximately 550 km above Earth’s surface and can passively de-orbit over the course of 1-2 years if their propulsion system should become unusable.
Starlink has been rolling out their “Better Than Nothing Beta” test of Starlink service to investors and those who signed up via the company’s website.
Last week, after those initial offerings and regulatory approval in Canada, Starlink “Better Than Nothing Beta” underwent a limited public release in both the northern U.S. and Canada.
With each mission, the coverage ability for Starlink moves farther south in terms of latitude. Previously, Starlink and SpaceX have said approximately 1,500 satellites needed to be launched to support initial, full coverage. With the launch of mission V1.0 L15, SpaceX will have put 893 V1.0 Starlink satellites into orbit, well over half of the initial number needed.
After the initial batch of Starlinks are in orbit, the company will focus their launches on both maintaining the initial constellation and starting to build out the other orbital shells to increase Starlink’s reach. A fleet of up to 42,000 spacecraft is possible based on current FCC (Federal Communications Commissions) licenses already approved.
Exactly how many satellites will ultimately be used for operation of the network is not known, with a large portion of those plans dependent on actual user demand for the system, which has already demonstrated its ability to bring reliable, needed communications to rural areas battling natural disasters as well as remote First Nations and Native American lands in the U.S. and Canada.
Those types of services not only aid first responders and emergency forces in the protection of lives, but also brings to native lands a connectivity that dramatically increases access to healthcare and information — among many other benefits.
(Lead image: Stephen Marr for NSF/L2)
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