Atomic Data

Kentucky Atomic Line List
Opacity Project
NIST Atomic Spectra Database
Tübingen Model Atom Database


Astronomy & Astrophysics
The Astrophysical Journal
The Astrophysical Journal Supplement
The Astrophysical Journal Letters
Monthly Notices of the Royal Astronomical Society

Archives, Catalogs, Surveys

Mikulski Archive for Space Telescopes (MAST)
MAST is a NASA funded project to support and provide to the astronomical community a variety of astronomical data archives, with the primary focus on scientifically related data sets in the optical, ultraviolet, and near-infrared parts of the spectrum. MAST is located at the Space Telescope Science Institute (STScI).

The All Sky Automated Survey (ASAS)
ASAS is a low cost project dedicated to constant photometric monitoring of the whole available sky, which is approximately 10^7 stars brighter than 14 magnitude. The project's ultimate goal is detection and investigation of of any kind of the photometric variability. One of the main obectives of ASAS is to find and catalog variable stars.

The Two Micron All Sky Survey (2MASS)
White Dwarf Catalog
Subdwarf Database

Useful stuff

SDSS DR12 object explorer

Galactic Dust Reddening and Extinction
This service gives the Galactic dust reddening for a line of sight, returning a reddening map, the corresponding 100 micron intensity, and dust temperature, along with statistics for each. The total Galactic visual extinction is estimated and, in Single Location mode, extinctions at multiple wavelengths are estimated. The reddening estimates are from Schlegel, Finkbeiner & Davis (1998), who combined results of IRAS and COBE/DIRBE.

3D Map of Milky Way Dust
3D Map of interstellar dust reddening, covering three-quarters of the sky out to a distance of several kiloparsecs, based on Pan-STARRS1 and 2MASS photometry. The map reveals a wealth of detailed structure, from filaments to large cloud complexes.

STARALT - Object Visibility
Staralt is a program that shows the observability of objects in various ways: either you can plot altitude against time for a particular night (Staralt), or plot the path of your objects across the sky for a particular night (Startrack), or plot how altitude changes over a year (Starobs), or get a table with the best observing date for each object (Starmult).

Julian date converter
Converts Calendar date to Julian date or Julian date to Calendar date.

Heliocentric Julian Date calculator
Calculates Heliocentric Julian Date for a given calendar or Julian date.

Flux-Magnitude Conversion - Gemini
Flux-Magnitude Conversion - Spitzer Science Center
Conversion from magnitudes to flux, or vice-versa.

NASA Exoplanet Archive Periodogram Service
Returns periodograms of time series data and supports three algorithms: Lomb-Scargle, Box-fitting Least Squares, and Plavchan.

Sky lines
UVES sky emission spectrum obtained under dark conditions.

Diffuse Interstellar Band Catalog
This site provides a list of Diffuse Interstellar Bands (DIBs), which are relatively broad absorption bands in the spectra of stars behind interstellar matter.