A glimpse of the 140 payloads onboard SpaceX’s Transporter-15 mission. Image: SpaceX SpaceX will try again to launch 140 payloads onboard its Falcon 9 rocket at Vandenberg Space Force Base Friday morning. The planned flight comes two days after SpaceX scrubbed the mission around the time liquid oxygen load was supposed to start on the rocket’s upper stage. Liftoff of the Transporter-15, the 19th mission of SpaceX’s Smallsat Rideshare program, is scheduled for 10:44 a.m. PST (1:44 p.m. EST / 1844 UTC). The Falcon 9 rocket will fly on a southerly trajectory upon departure from Space Launch Complex 4 East. Spaceflight Now will have live coverage beginning about 30 minutes prior to liftoff.  The Transporter-15 mission follows similar flights in January, March and June. SpaceX also launched the Bandwagon-3 and -4 rideshare missions to mid-inclination low Earth orbit in April and November. SpaceX plans to launch the mission using a veteran Falcon 9 first stage booster with the tail number B1071, one of the company’s most flown rockets with this being its 30th flight. It previously made five missions for the National Reconnaissance Office, four previous rideshare flights (three Transporter and one Bandwagon) and NASA’s Surface Water and Ocean Topography (SWOT) mission. About 8.5 minutes after liftoff, B1071 will perform an autonomous landing, targeting touchdown on the drone ship, ‘Of Course I Still Love You’. If successful, this will be the 165th landing on this vessel and the 540th booster landing for SpaceX to date. The deployment sequence will begin with the Toro2 spacecraft a little more than 54 minutes after liftoff and conclude with NASA’s Realizing Rapid, Reduced-cost high-Risk Research (R5) CubeSat nearly two hours later. A SpaceX Falcon 9 rocket stands in the launch position at Space Launch Complex 4 East (SLC-4E) at Vandenberg Space Force Base ahead of the Transporter-15 mission. Image: SpaceX What’s onboard? One of the benefits of the rideshare program is it offers payload providers multiple avenues to get their spacecraft on a trip to space for a reduced cost from a dedicated rocket launch. It also offers multiple lanes to get their satellites manifested onto the rocket. One of those players is Seops Space, which uses a variety of deployment mechanisms to host and deploy customer payloads, including its Equalizer Flex, Ghost Trap Deployer and Keystone Separation System. Mauve, built by C3S, is Blue Skies Space’s first satellite. This spacecraft will be studying stars in our galaxy, providing a greater understanding of their behavior and powerful flares. Image: Seops The Texas-based company is responsible for deploying 11 spacecraft onboard the Transporter-15 mission. Those include four spacecraft from Alba Orbital (Hunity/NMMH-1, Sari-1, Sari-2, and Aniscat), three from C3S (Wisdom-A, Wisdom-B and Mauve), three NASA-backed CubeSats (Tryad-1, Tryad-2, and 3UCubed-A) and SatRev’s PW-6U CubeSat. “Every mission is different, and our strength lies in tailoring integration approaches for payloads that don’t fit a one-size-fits-all model,” said Chad Brinkley, chief executive officer of Seops in a statement. “We’re honored to support these organizations and the important work they’re doing to advance science, technology, and commercial innovation from space.” MERCURY ONE has been successfully integrated by Exolaunch for @SpaceX #Transporter15 🛰️ Designed in 9 months using @Proteus_Space‘s MERCURY platform, it carries 4 payloads and will demonstrate novel deployment mechanisms, an AI experiment and a space qualification campaign 🚀 pic.twitter.com/yVuITYcaPI