The Pioneer Venus Mission consisted of two major parts: the Multiprobe and the Orbiter. The Multiprobe was composed of the carrier or Bus (290 kg); Sounder, a large probe (315 kg) and 3 smaller probes (90 kg each). It was launched on August 8, 1978 and reached Venus on December 9, 1978. Sounder was released from the Bus on November 15, 1978 followed by 3 smaller probes on Nov 19, 1978.

	Large Probe	North Probe	Day Probe	Night Probe	Bus
Entry Time (200 km)	18:45:32	18:49:40	18:52:18	18:56:13	20:21:52
Impact Time	19:39:53	19:42:40	19:47:59	19:52:05	*
Loss of Signal	19:39:53	19:42:40	20:55:34	19:52:07	20:22:55
Impact Latitude	4.4 N	59.3 N	31.3 S	28.7 S	(37.9 S)
Impact Longitude	304.0	4.8	317.0	56.7	(290.9)
Solar Zenith Angle	65.7	108.0	79.9	150.7	60.7
Local Venus Time	7:38	3:35	6:46	0:07	8:30
All times in UT (= EST + 5 hours) on December 9, 1978
*Bus signal at 110 km altitude
** Information from NSSDC web site.

The Venus multiprobes and orbiter investigated Venus before rigorous archiving was an integral part of a NASA mission. As a result, no systematic archive of raw, calibrated and derived products was preserved. Data was preserved in NSSDCA in outdated formats and recent (2024) recovery efforts are producing Special Events Collections link to Special Events Collections.

The orbiter carried 16 instruments (total mass 45 kg) to study plasma interaction with the upper atmosphere, make multi-wavelength observations of the clouds and to map the surface with radar. It was launched on May 20,1978 and reached orbit on Dec 4, 1978. Entry into the atmosphere ended the mission on Oct 8, 1992. (See NASA SP-461 by Fimmel, Colin and Burgess for a general review of the mission.)

Some achievements during the 14 Year mission were

1. A radar map of the surface at 75 Km resolution
2. Characterization of Venus’ interaction with the solar wind setting limits on Venus” magnetic field
3. Established sulfuric acid content of cloud deck
4. Measured a decline in sulfuric acid in the atmosphere and detected implying active volcanic activity

The initial descriptions for the mission, its goals and instrumentation is given in
Space Science Reviews, 20(3), 248-354, 1977a. https://link.springer.com/journal/11214/20/3 and Space Science Reviews, 20(4), 356-525, 1977b. https://link.springer.com/journal/11214/20/4

Colin, L., Encounter with Venus, Science, 203, No. 4382, 743-745, Feb. 1979.

An introduction to the JGR special issue covering results is given by Colin, L, The Pioneer Venus Program , Journal of Geophysical Research, VOL. 85, NO. A13, Pages 7575-7598, December 30, 1980, https://doi.org//JA085iA13p07575 which includes a detailed bibliography.

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Accessing the Data

The Venus multiprobes and orbiter investigated Venus before rigorous archiving was an integral part of a NASA mission. As a result, no systematic archive of raw, calibrated and derived products was preserved. Some data was preserved in NSSDCA and recent (2024) recovery efforts generated the products in this data set. See the user’s guide for description of the data products included in this bundle.



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Citing Datasets for Publications

S.A.McLaughlin, Y.-I Won (2024), Pioneer Venus facial Events Data Bundle, NASA Planetary Data System, https://doi.xxxxx I think Lynn has this.