On March 31, 2023, the LAMOST DR10 (v1.0 version) dataset was officially released to domestic astronomers and international partners. This dataset contains more than 22.29 million spectra, which is 2.9 times the sum of the spectra released by all other survey projects in the world. LAMOST became the first survey project which has released spectra exceeding 20 million spectra.

The DR10 dataset is a collection of the spectra obtained by LAMOST from October 2011 to June 2022. The released 22.29 million spectra include 11.81 million low-resolution spectra from the observation of 5,923 plates and 10.48 million medium-resolution spectra from the observation of 1,951 plates. Both medium- and low-resolution spectra exceed 10 million. Moreover, a catalog of about 9.61 million sets of stellar spectral parameters was also released in DR10.

Scientific users can log on the website at http://www.lamost.org/dr10 to query and download the DR10 data.

 Table 1: Information of LAMOST DR10 dataset in detail.

The innovative design of LAMOST makes it actualize the combination of large aperture and wide field of view. The 4000 fibers and the robotic parallel controllable fiber positioning system have guaranteed its high spectral acquisition rate. LAMOST has kept the records of the most spectra released and the largest stellar spectral parameter catalogue released in the world for ten consecutive years.

In 2019, LAMOST became the first sky survey project in the world to release over 10 million spectra. In the last four years, the number of spectra released by LAMOST has doubled. LAMOST has brought the field of Galactic formation and evolution into a whole new era.

Figure 1. Left: Footprint of the low-resolution survey of LAMOST DR10. Right: Footprint of the medium-resolution survey of LAMOST DR10 (Credit: LAMOST)

This database can be accessed from March 31, 2023, at http://www.lamost.org/dr10.