Question: Who is the astronaut that inspired the nickname of "Spacetown" for Derry, New Hampshire?

full_context: Document 1: Dixville Notch, New Hampshire: Dixville Notch is an unincorporated community in Dixville township, Coos County, New Hampshire, United States. The population of the township, all of whom live in Dixville Notch, was 12 at the 2010 census. The village is known for being one of the first places to declare its results during United States presidential elections and the New Hampshire primary. It is located in the far north of the state, approximately 20 mi south of the Canadian province of Quebec.
Document 2: Russell Colley: Russell Colley was a U. S. mechanical engineer who played a role in creating the spacesuits worn by the Project Mercury astronauts, including fitting Alan B. Shepard Jr. for his historic ride as America's first man in space on May 5, 1961.
Document 3: USNS Alan Shepard (T-AKE-3): USNS "Alan Shepard" (T-AKE-3) is a "Lewis and Clark"-class dry cargo ship in the United States Navy. It is named for astronaut Rear Admiral Alan Shepard (1923–1998).
Document 4: East Derry, New Hampshire: East Derry, also known as the Upper Village, is an unincorporated community in the town of Derry in Rockingham County, New Hampshire. The village center constitutes the East Derry Historic District, listed on the National Register of Historic Places. It is located on a hill close to the geographic center of the town of Derry along East Derry Road, approximately 2 mi east of the built-up town center of Derry. East Derry has a separate ZIP code (03041) from the rest of the town of Derry. Alan Shepard lived in the village as a boy. Station #4 of the Derry Fire Department is located in the village.
Document 5: Derry (CDP), New Hampshire: Derry is a census-designated place (CDP) in the town of Derry in Rockingham County, New Hampshire, United States. The CDP comprises the urban center of the town, as well as the village of East Derry and connected suburban areas. The population of the CDP was 22,015 at the 2010 census, out of 33,109 people in the entire town of Derry.
Document 6: Richard F. Gordon Jr.: Richard Francis "Dick" Gordon Jr. (born October 5, 1929), (Capt, USN, Ret.), is a former American naval officer and aviator, chemist, test pilot, and NASA astronaut. He is one of only 24 people to have flown to the Moon, as the Command Module Pilot for the Apollo 12 mission.
Document 7: Jay Barbree: Jay Barbree (born November 26, 1933) is a correspondent for NBC News, focusing on space travel. Barbree is the only journalist to have covered every manned space mission in the United States, beginning with the first American in space, Alan Shepard aboard "Freedom 7" in 1961, continuing through to the last mission of the Space Shuttle, "Atlantis's" STS-135 mission in July 2011. Barbree has been present for all 135 space shuttle launches, and every manned launch for the Mercury, Gemini, and Apollo eras. In total, Barbree has been witness to 166 manned space launches.
Document 8: Robert Frost Farm (Derry, New Hampshire): The Robert Frost Farm in Derry, New Hampshire is a two-story, clapboard, connected farm built in 1884. It was the home of poet Robert Frost from 1900 to 1911. Today it is a New Hampshire state park in use as a historic house museum. The property is listed in the National Register of Historic Places as the Robert Frost Homestead.
Document 9: Londonderry, New Hampshire: Londonderry is a town in western Rockingham County, New Hampshire, United States. The town is bordered on the north by the city of Manchester and on the east by the town of Derry. The population was 24,129 at the 2010 census. Londonderry is known for its apple orchards and is home to the headquarters of Stonyfield Farm and partial home to Manchester-Boston Regional Airport.
Document 10: Alan Shepard: Rear Admiral Alan Bartlett Shepard Jr. (November 18, 1923 – July 21, 1998) was an American astronaut, naval aviator, test pilot, and businessman.
Document 11: Wally Schirra: Walter Marty "Wally" Schirra Jr. (March 12, 1923 – May 3, 2007), (CAPT, USN), was an American naval officer and aviator, aeronautical engineer, test pilot, and one of the original seven astronauts chosen for Project Mercury, United States first effort to put humans in space. He flew the six-orbit, nine-hour Mercury-Atlas 8 mission on October 3, 1962, becoming the fifth American, and the ninth human, to ride a rocket into space. In the two-man Gemini program, he achieved the first space rendezvous, station-keeping his Gemini 6A spacecraft within 1 ft of the sister Gemini 7 spacecraft in December 1965. In October 1968, he commanded Apollo 7, an 11-day low Earth orbit shakedown test of the three-man Apollo Command/Service Module. He was the first person to go into space three times, and the only person to have flown in Mercury, Gemini, and Apollo, logging a total of 295 hours and 15 minutes in space. He retired from the U.S. Navy at the rank of Captain and from NASA after his Apollo flight, becoming a consultant to CBS News for its coverage of the subsequent Apollo flights. He joined Walter Cronkite as co-anchor for the seven Moon landing missions.
Document 12: Manchester, New Hampshire: Manchester is the largest city in the U.S. state of New Hampshire, the eleventh largest city in New England, and as of 2016 the largest city in northern New England, an area comprising the states of Maine, New Hampshire, and Vermont. As of the 2010 census, the city had a population of 109,565, and its estimated 2016 population was 110,506. It is located in Hillsborough County along the banks of the Merrimack River, which divides the city into eastern and western sections. Manchester is near the northern end of the Northeast megalopolis. It was first named by the merchant and inventor Samuel Blodget (after whom Samuel Blodget Park and Blodget Street in Manchester's North End are named). Blodget's vision was to create a great industrial center similar to that of the original Manchester in England, which was the world's first industrialized city.
Document 13: Stuart Roosa: Stuart Allen "Stu" Roosa (August 16, 1933 – December 12, 1994), (Col, USAF), was an American aeronautical engineer, United States Air Force pilot, test pilot, and NASA astronaut, who was the Command Module Pilot for the Apollo 14 mission. The mission lasted from January 31 to February 9, 1971 and was the third mission to land astronauts (Alan Shepard and Edgar Mitchell) on the Moon. While Shepard and Mitchell spent two days on the lunar surface, Roosa conducted experiments from orbit in the Command Module "Kitty Hawk". He was one of only 24 people to travel to the Moon.
Document 14: Derry, New Hampshire: Derry is a town in Rockingham County, New Hampshire, United States. The population was 33,109 at the 2010 census. Although it is a town and not a city, Derry is the fourth most-populous community in the state. The town's nickname, "Spacetown", derives from the fact that Derry is the birthplace of Alan Shepard, the first astronaut from the United States in space. Derry was also for a time the home of the poet Robert Frost and his family.
Document 15: Alan Bean: Alan LaVern Bean (born March 15, 1932), (CAPT, USN, Ret.), is an American former naval officer and Naval Aviator, aeronautical engineer, test pilot, and NASA astronaut; he was the fourth person to walk on the Moon. He was selected to become an astronaut by NASA in 1963 as part of Astronaut Group 3. He made his first flight into space aboard Apollo 12, the second manned mission to land on the Moon, at the age of thirty-seven years in November 1969. He made his second and final flight into space on the Skylab 3 mission in 1973, the second manned mission to the Skylab space station. After retiring from the United States Navy in 1975 and NASA in 1981, he pursued his interest in painting, depicting various space-related scenes and documenting his own experiences in space as well as that of his fellow Apollo program astronauts.
ground_truth: Derry is the birthplace of Alan Shepard