"One of the questions we often get asked about is the significance of our zero-g indicator. It may look like we have two, but rest assured we have one," said NASA astronaut Bob Hines, Crew-4 pilot, during a live broadcast from Freedom a few hours before docking.
As Hines explained, the dolls were chosen by his daughter and the daughter of one of his crewmates, mission specialist Samantha Cristoforetti with the European Space Agency (ESA).
"My daughter chose 'Zippy' the turtle," said Hines, referring to the youngest of his three daughters, Julia. "It's one of her favorite and oldest stuffed animals. So we brought Zippy along for the ride,"
"And this is 'Etta,'" said Cristoforetti, introducing the little monkey or "la scimmietta" in Italian. "Etta is the way my older daughter Kelsey used to call her [the doll] because she is Italian, she would be a small monkey, but when she was small she could only say 'Etta' and so that is what we call her."
Etta was the first doll that Cristoforetti bought for her daughter, even before Kelsey was born.
"So I was excited that she chose Etta to fly to space with us," Cristoforetti said.
"Kjell's class from 2009 are known as 'The Chumps,' or 'The Chimps,' which is obviously a monkey," Hines said, referring to Crew-4 commander Kjell Lindgren's connection to Etta.
"And then Samantha's class from the European Space Agency, they were known as 'The Shenanigans,' and as everybody knows when you get a turtle and a monkey together, that is a shenanigan," said Hines. "So that is our single zero-g indicator that we have for our mission."
The two-in-one approach was a new one for zero-g indicators flown on SpaceX missions to the space station, though it has been seen before where the tradition began — in Russia. The custom can be traced back to the first human spaceflight when Soviet-era cosmonaut Yuri Gagarin took a doll with him on Vostok I in 1961.
Since then, many Russian crew members (and later, their American and European crewmates) chose stuffed animals and other toys to suspend in their spacecraft.
"Zippy," as it happens, is the second turtle to fly. The Crew-3 astronauts, who Crew-4 are replacing on the space station, chose a sequined sea turtle, which like Zippy, was a reference to "The Turtles" astronaut class.
Zippy is also the second SpaceX-flown zero-g indicator to be made by Ty, the toy company of Beanie Babies fame. Part of Ty's Beanie Boos line of dolls, Zippy was first produced in 2013. (The first zero-g indicator made by Ty was "Tremor," the Apatosaurus.)
The make or manufacturer of Cristoforetti's "Etta" monkey was not identified.
SpaceX Crew-4 pilot Bob Hines and mission specialist Samantha Cristoforetti let their daughters select their zero-g indicators, a plush turtle named Zippy and small monkey named Etta. (NASA TV)
Two toys, one indicator: The Space Crew-4 astronauts chose Zippy the turtle and Etta the monkey as one zero-g indicator. (NASA TV)
The Crew-4 zero-g indicators were first seen floating soon after the Dragon spacecraft Freedom entered Earth orbit. (NASA TV)
Zippy the turtle is the second turtle doll and second Ty product to fly as a zero-g indicator on a SpaceX Dragon mission. (Ty)