Astra Data Products Data products that are produced by Astra can be categorized in the following ways: For DR20, the APOGEE HDUs for the mwmAllVisit and mwmAllStar files are present but empty, because there is no new APOGEE data released in DR20. There is a column in the DR20 files called sdss_dr19_apogee_flag. If True, this […]
Search Results for: SDSS-IV
Astra
Astra is the glue that brings together analysis methods into a single software framework. MWM observes stars across the HR diagram with both the BOSS and APOGEE spectrographs. This wide range of stellar parameters, resolution, and wavelength coverage means that a single pipeline is not currently suitable. Links on the sidebar will take you to […]
Data Access
Data Products DR20 builds upon DR19, and contains a wealth of new BOSS optical spectroscopic data using the FPS systems, including all optical spectra observed through February 2, 2025, while the APOGEE near infrared spectroscopic data products are carried over directly from DR19. For the first time, DR20 includes optical spectroscopic data from the SDSS-V […]
Data Release 20
DR20 is the second data release for the fifth phase of the Sloan Digital Sky Survey (SDSS-V). Its content is described in detail on the DR20 data release paper. DR20 includes the following: Access to the DR20 data products is described on this page, while the Black Hole Mapper, Milky Way Mapper, and Local Volume […]
Ivan Lacerna
1. Can you describe your role in the SDSS collaboration and what you enjoy most about it? I am the former Lead Scientist for SDSS-V Chile (2021-2023) and CoCo representative of the Chilean National Time Allocation Committee (CNTAC, 2020-2021). I enjoy the collaborative spirit in different areas of SDSS-V and the respect among their members […]
Image Gallery
This page shows images associated with the Sloan Digital Sky Survey. For more images, see our previous image galleries. To reuse these images, see Image Permissions. SDSS and du Pont Telescopes Focal Plane System Local Volume Mapper Milky Way Mapper Other SDSS Image Galleries Many more images can be found on the Image Galleries of […]
DR19 Zora and Valis
Zora and Valis are new user interfaces for accessing and exploring new data in SDSS-V. They complement the legacy Science Archive Webapp (SAW) for accessing SDSS-IV optical and infrared spectra. They provide ways of searching for SDSS data, exploring observed target metadata, and visualizing or accessing spectral data. Zora is a modern, reactive, component-based User […]
DR19 Output Files
Astra Data Products Data products that are produced by Astra can be categorized in the following ways: We do not coadd spectra across instruments that were observed at from both observatories (e.g., we do not co-add APOGEE spectra from LCO with APOGEE spectra from APO). The pipeline spectrum data products all share a reasonably consistent […]
DR19 The Payne
Summary The Payne (Ting et al. 2019) uses a two-hidden-layer neural network to determine 25 stellar labels simultaneously given a rest-frame resampled APOGEE spectrum. The network is trained on a set of synthetic spectra based on Kurucz atmospheric models. For DR19, we use the same synthetic spectra and model as in Ting et al. (2019). […]
DR19 AstroNN
AstroNN Summary AstroNN (Leung & Bovy 2019) uses a deep-learning artificial neural network to determine stellar parameters (Teff, log g and metallicity) and 18 individual element abundances with associated uncertainty given a rest-frame resampled APOGEE spectrum. The network is trained on high quality APOGEE spectra and labels from SDSS-IV Data Release 17. Detailed Description AstroNN […]