A page from the flight plan used during the Apollo 13 lunar mission, showing a caricature of astronaut Jack Swigert.

Update: The Apollo 13 flown flight plan sold for $275,000–more than six times its high estimate.

What you see: A page from the flight plan used during the Apollo 13 lunar mission. Sotheby’s estimates it at $30,000 to $40,000.

What was Apollo 13? It was a 1970 moon voyage that never made it to the moon. An oxygen tank exploded 56 hours after liftoff, transforming the lunar mission into a rescue mission. The wounded vessel returned to Earth after four tense and terrifying days. The crew of three drank little, ate less, and slept even less than that. They arrived home on April 17, 1970, alive but collectively 31 and a half pounds lighter. The tale of Apollo 13 might be best known through the 1995 Academy Award-winning film that stars Tom Hanks, Kevin Bacon, and Bill Paxton.

Astronaut Fred Haise inscribed the Apollo 13 flight plan to “Bob.” Who is Bob? He is Robert “Bob” Lindsey, the lead flight planner for Apollo 13. “This plan contained all the steps they had to follow to get into space. Lindsey figured out everything that needed to be done. Of course, the spacecraft did not comply,” says Cassandra Hatton, vice president and senior specialist for books and manuscripts at Sotheby’s. “Though they didn’t make it to the moon, Lindsey was instrumental in getting them out there, and instrumental in getting them back.” His descendants consigned the flight plan to Sotheby’s.

Wait, so there was only one flight plan aboard Apollo 13? Was it a NASA tradition for Apollo crews to give the flown flight plan to the lead flight planner when they got back to Earth? “Yes, this is it,” Hatton says of the document, and adds that giving the flight plan to the lead planner was not routine: “It was just something the Apollo 13 crew decided to do as an extra thank-you to the people who saved their lives.”

Does the Apollo 13 flight plan contain handwritten notes from the astronauts after the oxygen tank exploded? Yes. The flight plan covers the voyage from liftoff to the point when astronauts Jack Swigert, Jim Lovell, and Haise abandoned the command module for the lunar lander, which they used as a lifeboat. The document also contains notes in red ink from Ken Mattingly, the original Apollo 13 command module pilot. He was removed from the crew days before the launch after fellow astronaut Charlie Duke unwittingly exposed him to German measles. Swigert replaced Mattingly.

What notes in the Apollo 13 flight plan show the reaction to the explosion? Page 3-38 corresponds to the time of the accident. Lovell, the mission commander, crossed out the typewritten plans and wrote new ones, which include leaving the main vessel for the lunar module (LM). Lovell observed the need to “insure proper 02 concentration in LM.” Maintaining oxygen levels in the LM did pose a challenge. NASA engineers later had to teach the astronauts to jerry-rig a carbon dioxide filter that would work in the LM with parts that the astronauts had on hand.

How do we know which astronaut wrote which notes? Hatton referenced the air-to-ground transcript that NASA took for Apollo 13. By matching the transcript against the flight plan, she was able to identify each author. “If you take the time to go through it and read it, page by page, and compare it to the transcript, it solidifies our perception of them as being heroes,” she says. “‘Ok, we have no heat, no water, no food, and we can’t get any sleep, but we’re not going to panic and we’re going to get home.’ My heart was pounding. It’s an incredible thing.”

Why are there cartoons in the Apollo 13 flight plan? NASA asked Johnson Space Centre artist Barbara Matelski to sketch caricatures of the crew in the flight plan before the launch as a jokey surprise for them to discover as they leafed through its pages. Shown here is the caricature of Swigert, who takes a ribbing over his political ambitions. He won the House of Representatives race for Colorado’s 6th district in November 1982, but died of bone cancer before he could be sworn in. He was 51 when he passed away. Lovell is now 89, Haise is 83, and Mattingly is 81.

The Apollo 13 flight plan’s presale estimate is $30,000 to $40,000. Isn’t that kind of low? “The estimate is very, very conservative. It is. I’m confident it will far exceed its estimate,” she says, adding that its closest analog is a document that was embroiled in controversy. In 2011, Lovell consigned the flown LM Apollo 13 checklist–which takes over where this flight plan leaves off–to auction. It sold for $388,375, but the transaction was voided when NASA objected. President Barack Obama subsequently signed a law that gives clear title to memorabilia received by astronauts during the course of their work with the Gemini, Mercury, and Apollo programs. “It’s interesting to see what the impact of the new law will be,” she says. “It’s very clear about who the title lays with, so bidders can have confidence in this.”

How to bid: The flown Apollo 13 flight plan is lot 140 in Sotheby’s Space Exploration auction in New York, scheduled for–of course–July 20, 2017.

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