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Document Type:

FOIA

Keywords:

Collection:

Document Number (FOIA) /ESDN (CREST):

0001268876

Release Decision:

RIPPUB

Original Classification:

Document Page Count:

Document Creation Date:

June 24, 2015

Document Release Date:

December 16, 2011

Sequence Number:

Case Number:

F-2010-01025

Publication Date:

October 10, 1968

File:

Attachment	Size
DOC_0001268876.pdf	54.87 KB

Body:

` Tep SEll TITT (b)(l ) (b)(3) PERJMA.NJ.IN'T File Copy DO NOT REMOVE This, publication is produced daily from selected incoming reports of all kinds. The views ex- pressed are preliminary and subject to change. They have not been coordinated outside of OSI and FMSAC and do not necessarily reflect official positions of these offices. No action should be taken based solely on the preliminary evaluations of items herein. Users should consult the original sources of items for greater detail. Questions concerning this publication should be directed to the Surveyor Staff, OSI APPROVED FOR RELEASEL DATE: 08-Dec-2011 Surveyor recorded an altitude of 25 km. Altimeter Data: Soviet scientists at the International' Symposium on Moon and Planet Physics (Kiev, USSR, 15-22 October) presented data from the Venus 4 probe-W'ith extrapolations from the point at which transmissions ceased down to the surface of. Venus. In a private con- versation at the symposium, a Soviet scientist verified suspicions of US scientists that design of the Venus 4 radar altimeter rendered this instrument susceptible to errors of a factor of two in altitude readings.. For example, at 50 km above the surface, the altimeter probably 10 December 1968 Soviet Scientists Admit Possible Errors In Venus 4 Radar Comment: The Soviet presentation and remarks clearly indicate that many Soviet astronomers actually do not accept their public position that Venus 4 transmitted data all the way to the surface of Venus. Analyses of the radar and Mariner 5 data lead to the conclusion that Venus 4 transmission ceased at an altitude of about 25 km above the planet's surface.

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