# General estimates for early science releases

**URL:** <https://www.rubin.community/t/general-estimates-for-early-science-releases/10587>\
**Category:** Early Science\
**Created:** [July 14, 2025, 7:30am UTC](https://www.rubin.community/t/general-estimates-for-early-science-releases/10587 "2025-07-14T07:30:37Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![nsevilla](https://sea2.discourse-cdn.com/flex002/user_avatar/www.rubin.community/nsevilla/32/1634_2.png) [@nsevilla](https://www.rubin.community/u/nsevilla)\
**Post date:** [July 14, 2025, 7:30am UTC](https://www.rubin.community/t/general-estimates-for-early-science-releases/10587/1 "2025-07-14T07:30:37Z")

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Hello. I was interested to know if there is a public document or online resource with estimates on number of objects/observations and footprints (under whatever assumptions) for DP2 and DR1.  
Thanks.

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**Author:** ![nsevilla](https://sea2.discourse-cdn.com/flex002/user_avatar/www.rubin.community/nsevilla/32/1634_2.png) [@nsevilla](https://www.rubin.community/u/nsevilla)\
**Post date:** [July 14, 2025, 4:21pm UTC](https://www.rubin.community/t/general-estimates-for-early-science-releases/10587/2 "2025-07-14T16:21:43Z")

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From @bechtol

> Reference for DP2: [https://sitcomtn-005.lsst.io/](https://sitcomtn-005.lsst.io/)
> 
> There is a simulation file [Enhanced Baseline Science Validation Surveys Design for Start of Pilot Observations - #6 by ljones](http://www.rubin.community/t/enhanced-baseline-science-validation-surveys-design-for-start-of-pilot-observations/10210/6)
> 
> This code defines the footprint  
> [ts\_fbs\_utils/python/lsst/ts/fbs/utils/maintel/sv\_config.py at develop · lsst-ts/ts\_fbs\_utils · GitHub](https://github.com/lsst-ts/ts_fbs_utils/blob/develop/python/lsst/ts/fbs/utils/maintel/sv_config.py)

However, was especially interested in DR1 prospects too.

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**Author:** ![TomLoredo](https://sea2.discourse-cdn.com/flex002/user_avatar/www.rubin.community/tomloredo/32/4306_2.png) [@TomLoredo](https://www.rubin.community/u/TomLoredo)\
**Post date:** [July 14, 2025, 10:05pm UTC](https://www.rubin.community/t/general-estimates-for-early-science-releases/10587/3 "2025-07-14T22:05:27Z")

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Not a direct answer to your question, but this thread is somewhat related and might be helpful: [Depths for DR1 and more - Support / Data Products - Rubin Observatory LSST Community forum](http://www.rubin.community/t/depths-for-dr1-and-more/8002/2).

Also, this ancient (2013!) document refers to DR1 being expected to contain “23.09 billion objects”, but it doesn’t specify where this number comes from (it is appropriately less than the 37B predicted for DR11): [DMTN-048: Qserv design prototyping experiments](https://dmtn-048.lsst.io/#dc2-database-partitioning-tests).