# What is the first time that two satellites were launched together as the same payload?

Below I've assembled some research into the question of which launch is actually the first to carry two satellites into orbit, but so far I think the results are inconclusive. So despite there being discussion of this in other posts, I think this issue of history and records in Space Exploration still needs its own, definitive answer.

Question: What is the first time that two satellites were launched together as the same payload?

Background/research:

The first launch that I could find it is this:

22 June 1960 - Thor Ablestar

• Transit 2A
• GRAB-1

but maybe there are other launches before that?

Failed launches also count

Related questions:

• +1 I think that this is a good and well-researched question and I've made an edit to differentiate it from previous questions in hopes that it can receive a definitive answer. – uhoh Jan 23 at 1:07
• I found in the JSR launch database this - 1959 Apr 13 - Thor Agena A - Discoverer 2 and SRV - successful launch, but I can't find what SRV is – Joe Jobs Jan 23 at 1:10
• SRV is the General Electric Satellite Return Vehicle, which returns the film capsule from a Keyhole spy satellite. So, I would count this as a component of the satellite, not a separate second satellite. – Jörg W Mittag Jan 23 at 2:46
• A dummy mass simulator SOLRAD was successfully launched on 13 April 1960, attached to Transit 1B, proving the dual satellite launch technique - rocket: Thor Ablestar - Though it does't mention of they actually separated and orbited as two separate satellites – Joe Jobs Jan 23 at 3:11
• Vanguard SLV-5 launched on 14 April 1959 - failed to launch two satellites. This one seems to be the first attempt - Vanguard SLV-5 hoped to put into orbit two satellites: the Vanguard 3A satellite, a magnetometer, and a 76 cm (30 in) round inflatable sphere with an air density measurement device - looks like 3 satellites though, I'm confused – Joe Jobs Jan 23 at 3:13