2026-244Latest orbital launch: Falcon 9 · Starlink Group 15-16 · Oct 27, 2026 · VandenbergLaunch record →
sci-techmaventhe history of spaceflight, in data
  1. Home
  2. Spacecraft
  3. SECOR 4
// geodesy · 1965

SECOR 4

American military geodetic satellite. SECOR 4 was launched on April 3, 1965 aboard a Atlas SLV-3 Agena D from Vandenberg. Latest status in GCAT: in orbit.

COSPAR 1965-027BNORAD 1315United States

Identity

Name in GCAT
EGRS IV
Common name
SECOR 4
Payload designation
Secor II S/N 5 (ITT C-101)
International designator
1965-027B
NORAD catalog number
1315
GCAT identifier
S01315
UN registration
A/AC.105/INF.104

Mission

Mission type
Geodesy
Use
Defense
Program
Secor II
Owner
USA ACE
Country
United States
Builder
ITT Federal Laboratories
Platform (bus)
Secor

Launch

Date
April 3, 1965 · 21:25 UTC
Launch record
1965-027Success
Spaceport
Vandenberg · pad PALC2-4

Orbit and fate

Orbit class (GCAT)
LEO/P
Perigee
1,265 km
Apogee
1,320 km
Inclination
90.22°
Status
In orbit
Last known active
February 2023
End of operations
Apr 3, 1965

Size

Mass
18 kg
Dry mass
18 kg
Length
0.2 m
Diameter
0.40 m
Span
0.5 m

Source: GCAT payload, deep-space and lander catalogs, Jonathan C. McDowell (CC BY 4.0); Wikidata Q9326067 (CC0).