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Sputnik 1 nested example data

Source: R/data.R
sputnik_1.Rd

A nested list containing structured information about Sputnik 1, the first artificial Earth satellite.

Usage

sputnik_1

Format

A nested list.

Source

NASA History, Sputnik and the Dawn of the Space Age: https://www.nasa.gov/wp-content/uploads/static/history/sputnik.html

NASA History, Korolev, Sputnik, and the International Geophysical Year: https://www.nasa.gov/history/sputnik/siddiqi.html

National Museum of the United States Air Force, Sputnik I: https://www.nationalmuseum.af.mil/Visit/Museum-Exhibits/Fact-Sheets/Display/Article/197681/sputnik-i/

U.S. Department of State, Sputnik, 1957: https://history.state.gov/milestones/1953-1960/sputnik

Wikipedia, Sputnik 1: https://en.wikipedia.org/wiki/Sputnik_1

Details

The object includes historical metadata, spacecraft specifications, launch information, orbital parameters, radio system details, mission objectives, chronology, Cold War context, related spacecraft, source notes, and additional branches designed for testing recursive list traversal.

This dataset is useful for testing functions such as list_map(), list_map2(), list_pmap(), and list_imap() because it contains:

  • deeply nested lists;

  • named and unnamed branches;

  • NULL leaves;

  • empty lists;

  • Date and POSIXct objects;

  • numeric and character vectors;

  • data frames that should be treated as leaf values.

Examples

data(sputnik_1)

names(sputnik_1)
#>  [1] "meta"               "identity"           "launch"            
#>  [4] "spacecraft"         "orbit"              "mission_objectives"
#>  [7] "chronology"         "historical_context" "related_spacecraft"
#> [10] "source_notes"       "test_branches"     

sputnik_1$identity$names$common
#> [1] "Sputnik 1"
sputnik_1$spacecraft$physical$mass_kg
#> [1] 83.6
sputnik_1$orbit$canonical_values$period_min
#> [1] 96.2

# Useful with recursive mapping:
# list_nleaf(sputnik_1)
# list_imap(sputnik_1, \(x, path) paste(path, collapse = "."), .name = "path")