Vanguard 1
Vanguard 1 is an early American satellite launched in 1958, notable for being the oldest human-made object still in orbit.
Also known as: Vanguard I
How big is it?
16.5 cm · satellite body diameter
Satellite body diameter · specified
A little perspective
Vanguard 1 vs Geoduck: length comparison
The shell length of a geoduck is about 1.03 times the satellite body diameter of Vanguard 1.
Vanguard 1 is an early American satellite launched in 1958, notable for being the oldest human-made object still in orbit.
A geoduck is a large burrowing marine clam with a comparatively small shell and a very long siphon.
Both rulers start at the same zero and share one linear scale. Artwork keeps its original proportions.
Measurements, assumptions & sources +
Vanguard 1
Satellite body diameter: 16.5 cm; specified.
Vanguard 1 is a 16.5 cm diameter aluminium sphere with a launch mass of 1.474 kg. Its six antenna rods extend beyond the calibrated spherical body diameter.
The marked satellite body diameter is calibrated. Unmeasured illustration details are representative.
Geoduck
Defined shell length: 17 cm; defined specimen; range 12 cm–22 cm.
A defined Pacific geoduck with a 17 cm shell and 1.2 kg live mass. The long siphon can extend far beyond the shell and is shown for identity, but shell length is the calibrated span.
Washington Department of Fish and Wildlife — Geoduck
The marked defined shell length is calibrated. Unmeasured illustration details are representative.
Use the visual comparison to explore its scale, then check the measurements and sources.
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Why this measurement?
Why we use 16.5 cm
We compare the satellite body diameter of Vanguard 1. This value follows a stated specification; check its scope in the notes.
Vanguard 1 is a 16.5 cm diameter aluminium sphere with a launch mass of 1.474 kg. Its six antenna rods extend beyond the calibrated spherical body diameter.
The marked horizontal span follows the measured feature, not the edges of the image. How calibrated comparisons work →
Recorded properties
Dimensions and measurements
| Property | Selected value | Recorded range | Basis |
|---|---|---|---|
| 16.5 cm | Not recorded | specified | |
| 1.474 kg | Not recorded | specified |
Around this scale
Explore nearby values.
Compare examples with lower, similar and higher values. Each card names the measurement being compared.
Nearest lower valueEveryday objectsBroccoli head16 cmDefined crown diameterA broccoli head is the compact, edible crown of the broccoli plant, consisting of clustered green flower buds.
Around the same scalePeople and human anatomyHuman brain15 cmRepresentative front-to-back lengthThe human brain is the organ that processes sensory information and coordinates thought, memory, movement and many body functions.
Nearest higher valueLiving thingsGeoduck17 cmDefined shell lengthA geoduck is a large burrowing marine clam with a comparatively small shell and a very long siphon.Sources and method
Want to check the number?
The source records and measurement method remain available for inspection.
- NASA NSSDC — Vanguard 1Satellite body diameter, mass, antenna configuration and mission context.
There’s always another scale
Follow your curiosity.
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Everyday thingsCauliflower head18 cmA cauliflower head is the dense, edible white curd of the cauliflower plant, formed by undeveloped flower buds.
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