SDSS Science Archive Server (SAS) The SAS is a hierarchical directory structure with named data products, and can be navigated directly: Individual data products are either replacements from previous data releases, and add incrementally to the data volume, or contain links to previous data releases, and add cumulatively to the data volume. Whether you are […]
Search Results for: SDSS-IV
Get Data
Spectroscopic Data There are several ways to get to the Spectroscopic Data. Below we list several ways for you to download spectra and catalogs, with the caveat that for large downloads we have additional information on the Bulk Download Page. Alternative ways to access spectra and catalogs are through: The SDSS optical spectra are split […]
Bitmasks
SDSS makes heavy use of the concept of a bitmask in spectroscopic target flags and other contexts. For the actual bit values for all SDSS flags, see the lists below. More detailed descriptions of the targeting bitmasks for the completed optical surveys and infrared surveys can be found in the DR17 release documentation. The page […]
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 […]
MWM Targeting Cartons
This page is a comprehensive list of cartons available up through Data Release 20. Each carton is associated with a well defined targeting generation. These generations were used at different points in the survey for plate designs or Robostrategy designs for the FPS. For a full description of the targeting generations see the List of […]
Planet Hosts
The goal of the Planet Host program is to create a uniform catalog of stellar characteristics and elemental abundances derived from APOGEE spectra of planet hosting stars. The program was originally conceived as a follow-up program for the Transiting Exoplanet Survey Satellite (TESS) mission, targeting all stars from the TESS mission with light curves taken […]
ApogeeNet
No new APOGEE Data in DR20 Summary ApogeeNet (Olney et al. 2020; Sprague et al. 2022; Sizemore et al. 2024 ) uses a convolutional neural network to estimate stellar labels (effective temperature, surface gravity, and metallicity) given a rest-frame resampled APOGEE spectrum. The network is trained on high quality APOGEE spectra and labels from SDSS-IV […]
ASPCAP
No new APOGEE Data in DR20 Summary APOGEE Stellar Parameter and Chemical Abundances Pipeline (ASPCAP)is a pipeline for measuring stellar parameters and chemical abundances from APOGEE spectra. The data for DR20 is a copy of the DR19, so no changes have been made. ASPCAP wraps the FERRE code (Allende Prieto et al. 2006), which interpolates […]
AstroNN and AstroNNDist
No new APOGEE Data in DR20 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 […]
The Payne
No new APOGEE Data in DR20 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 DR20, we use the same synthetic spectra and model […]